Transmission mount bolts
 

I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
previsouly used mainly as an offroad vehicle, I don't know what to
expect as far as the condition of the current hardware, given the fact
that one of the nuts holding the mount to the skid plate is missing
already, and those studs are all rusted up. As such, I decided to just
replace the bolts connecting the mount to the transmission housing with
all new ones.

I got from the Jeep parts department the specification that these bolts
are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
completely non-standard size, and this isn't a part the dealer carries.
I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
that size.

My question to all you Jeep geniuses out there is, how tight is the
clearance between the ends of these bolts and the rear of the
transmission housing. Am I going to have a problem as a result of this
extra 5 thousandths of an inch? Does anybody know where I can obtain
the right size bolts if so? I find it hard to believe that anyone would
design something like that with such tight tolerances, but then stupider
things have happened. I'd like to avoid any surprises once I've got the
skid plate off and all, so I want to make sure I have appropriate
hardware before I start.

Any help or reassurance that I'm not going to puncture or crack my
tranny housing with my extra 5 thousandths of an inch (or a warning that
I will if that's the case) will be greatly appreciated.

Thanks,
Scott

Re: Transmission mount bolts
 

I don't understand why the damn dealers don't carry the bolts, same
thing happened to me on my CJ7.

Put a thick washer on it to be sure it doesn't punch through or stick a
screw driver in the hole to measure the depth, sometimes they allow an
extra 1/8" to 1/4" in hole depth beyond the bolt length.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Scott wrote:
>
> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.
>
> Thanks,
> Scott

Re: Transmission mount bolts
 

I don't understand why the damn dealers don't carry the bolts, same
thing happened to me on my CJ7.

Put a thick washer on it to be sure it doesn't punch through or stick a
screw driver in the hole to measure the depth, sometimes they allow an
extra 1/8" to 1/4" in hole depth beyond the bolt length.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Scott wrote:
>
> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.
>
> Thanks,
> Scott

Re: Transmission mount bolts
 

On Fri, 22 Aug 2003 00:30:26 UTC Scott <scottlit@cableone.net> wrote:

> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.

..005 difference? That's about one good grunt after it's tight <g>.
Seriously, when I put an AX15 in the MJ I almost screwed up royally
with those bolts - the ones in the holes when I got it had a shoulder
that was too long for the mount plate so that the shoulder hit before
it snugged up against the plate. One more good tug on the wrench
would probably have busted the ear off the tranny. AIR, there is way
more than .005 extra room - the end of the bolt was nowhere near the
case even with obviously too much bolt. I elected to get replacement
bolts that were full thread the same length as the ones that came with
the tranny - no problem with clearance.

--
Will Honea <whonea@codenet.net>

Re: Transmission mount bolts
 

On Fri, 22 Aug 2003 00:30:26 UTC Scott <scottlit@cableone.net> wrote:

> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.

..005 difference? That's about one good grunt after it's tight <g>.
Seriously, when I put an AX15 in the MJ I almost screwed up royally
with those bolts - the ones in the holes when I got it had a shoulder
that was too long for the mount plate so that the shoulder hit before
it snugged up against the plate. One more good tug on the wrench
would probably have busted the ear off the tranny. AIR, there is way
more than .005 extra room - the end of the bolt was nowhere near the
case even with obviously too much bolt. I elected to get replacement
bolts that were full thread the same length as the ones that came with
the tranny - no problem with clearance.

--
Will Honea <whonea@codenet.net>

Re: Transmission mount bolts
 

Will Honea wrote:
> On Fri, 22 Aug 2003 00:30:26 UTC Scott <scottlit@cableone.net> wrote:
>
>
>>I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
>>4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
>>previsouly used mainly as an offroad vehicle, I don't know what to
>>expect as far as the condition of the current hardware, given the fact
>>that one of the nuts holding the mount to the skid plate is missing
>>already, and those studs are all rusted up. As such, I decided to just
>>replace the bolts connecting the mount to the transmission housing with
>>all new ones.
>>
>>I got from the Jeep parts department the specification that these bolts
>>are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
>>completely non-standard size, and this isn't a part the dealer carries.
>> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
>>that size.
>>
>>My question to all you Jeep geniuses out there is, how tight is the
>>clearance between the ends of these bolts and the rear of the
>>transmission housing. Am I going to have a problem as a result of this
>>extra 5 thousandths of an inch? Does anybody know where I can obtain
>>the right size bolts if so? I find it hard to believe that anyone would
>>design something like that with such tight tolerances, but then stupider
>>things have happened. I'd like to avoid any surprises once I've got the
>>skid plate off and all, so I want to make sure I have appropriate
>>hardware before I start.
>>
>>Any help or reassurance that I'm not going to puncture or crack my
>>tranny housing with my extra 5 thousandths of an inch (or a warning that
>>I will if that's the case) will be greatly appreciated.
>
>
> .005 difference? That's about one good grunt after it's tight <g>.
> Seriously, when I put an AX15 in the MJ I almost screwed up royally
> with those bolts - the ones in the holes when I got it had a shoulder
> that was too long for the mount plate so that the shoulder hit before
> it snugged up against the plate. One more good tug on the wrench
> would probably have busted the ear off the tranny. AIR, there is way
> more than .005 extra room - the end of the bolt was nowhere near the
> case even with obviously too much bolt. I elected to get replacement
> bolts that were full thread the same length as the ones that came with
> the tranny - no problem with clearance.
>

Well that's what I've got, is a full thread bolt, that's as close as I
seem to be able to get to the factory spec, 0.005" over in length, but
no shoulder (assuming by shoulder you mean the unthreaded section at the
head end of some bolts). So you're saying I should be good then?

Re: Transmission mount bolts
 

Will Honea wrote:
> On Fri, 22 Aug 2003 00:30:26 UTC Scott <scottlit@cableone.net> wrote:
>
>
>>I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
>>4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
>>previsouly used mainly as an offroad vehicle, I don't know what to
>>expect as far as the condition of the current hardware, given the fact
>>that one of the nuts holding the mount to the skid plate is missing
>>already, and those studs are all rusted up. As such, I decided to just
>>replace the bolts connecting the mount to the transmission housing with
>>all new ones.
>>
>>I got from the Jeep parts department the specification that these bolts
>>are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
>>completely non-standard size, and this isn't a part the dealer carries.
>> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
>>that size.
>>
>>My question to all you Jeep geniuses out there is, how tight is the
>>clearance between the ends of these bolts and the rear of the
>>transmission housing. Am I going to have a problem as a result of this
>>extra 5 thousandths of an inch? Does anybody know where I can obtain
>>the right size bolts if so? I find it hard to believe that anyone would
>>design something like that with such tight tolerances, but then stupider
>>things have happened. I'd like to avoid any surprises once I've got the
>>skid plate off and all, so I want to make sure I have appropriate
>>hardware before I start.
>>
>>Any help or reassurance that I'm not going to puncture or crack my
>>tranny housing with my extra 5 thousandths of an inch (or a warning that
>>I will if that's the case) will be greatly appreciated.
>
>
> .005 difference? That's about one good grunt after it's tight <g>.
> Seriously, when I put an AX15 in the MJ I almost screwed up royally
> with those bolts - the ones in the holes when I got it had a shoulder
> that was too long for the mount plate so that the shoulder hit before
> it snugged up against the plate. One more good tug on the wrench
> would probably have busted the ear off the tranny. AIR, there is way
> more than .005 extra room - the end of the bolt was nowhere near the
> case even with obviously too much bolt. I elected to get replacement
> bolts that were full thread the same length as the ones that came with
> the tranny - no problem with clearance.
>

Well that's what I've got, is a full thread bolt, that's as close as I
seem to be able to get to the factory spec, 0.005" over in length, but
no shoulder (assuming by shoulder you mean the unthreaded section at the
head end of some bolts). So you're saying I should be good then?

Re: Transmission mount bolts
 

Scott wrote:
> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.
>
> Thanks,
> Scott
>

Oh, yeah, also, does anybody know the proper torque specification for
the transmission mount to transmission bolts, the transmission skid
plate to frame bolts (I've heard the nutserts in the frame are pretty
soft and can easily be stripped if overtightened, so I'd just as soon do
it right), and the nuts on the studs that bolt the transmission mount to
the skid plate? I've ordered a service manual, but I don't think it
will come until next week, and I was kind of hoping to get this job done
this weekend (although this is sounding less and less likely now that I
promised to fix my buddies crappy Olds Alero this weekend... seems the
electrical system as a whole has taken a vacation... but that's another
story).

Thanks,
Scott

Re: Transmission mount bolts
 

Scott wrote:
> I'm getting ready to replace the transmission mount on my 97 TJ (5-spd,
> 4.0L, AX-15 tranny), and as I bought this Jeep used recently, and it was
> previsouly used mainly as an offroad vehicle, I don't know what to
> expect as far as the condition of the current hardware, given the fact
> that one of the nuts holding the mount to the skid plate is missing
> already, and those studs are all rusted up. As such, I decided to just
> replace the bolts connecting the mount to the transmission housing with
> all new ones.
>
> I got from the Jeep parts department the specification that these bolts
> are 0.437" (aka 7/16") x 14 x 1.120". The problem is 1.120" is a
> completely non-standard size, and this isn't a part the dealer carries.
> I have however been able to obtain 1.125" (1-1/8") grade 5 bolts in
> that size.
>
> My question to all you Jeep geniuses out there is, how tight is the
> clearance between the ends of these bolts and the rear of the
> transmission housing. Am I going to have a problem as a result of this
> extra 5 thousandths of an inch? Does anybody know where I can obtain
> the right size bolts if so? I find it hard to believe that anyone would
> design something like that with such tight tolerances, but then stupider
> things have happened. I'd like to avoid any surprises once I've got the
> skid plate off and all, so I want to make sure I have appropriate
> hardware before I start.
>
> Any help or reassurance that I'm not going to puncture or crack my
> tranny housing with my extra 5 thousandths of an inch (or a warning that
> I will if that's the case) will be greatly appreciated.
>
> Thanks,
> Scott
>

Oh, yeah, also, does anybody know the proper torque specification for
the transmission mount to transmission bolts, the transmission skid
plate to frame bolts (I've heard the nutserts in the frame are pretty
soft and can easily be stripped if overtightened, so I'd just as soon do
it right), and the nuts on the studs that bolt the transmission mount to
the skid plate? I've ordered a service manual, but I don't think it
will come until next week, and I was kind of hoping to get this job done
this weekend (although this is sounding less and less likely now that I
promised to fix my buddies crappy Olds Alero this weekend... seems the
electrical system as a whole has taken a vacation... but that's another
story).

Thanks,
Scott

Re: Transmission mount bolts
 

Usually bolts without a shank are not the correct grade for the
application.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Scott wrote:
>
> Well that's what I've got, is a full thread bolt, that's as close as I
> seem to be able to get to the factory spec, 0.005" over in length, but
> no shoulder (assuming by shoulder you mean the unthreaded section at the
> head end of some bolts). So you're saying I should be good then?