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Re: Correct Trans and diff fluid for a YJ

You are still confusing as ----. ;-)

Now you say it's 'ok' to use redline GL4, but don't do it because it's
supposed to be GL3 which redline doesn't make, but use redline because
it is better.

Oh and 'don't use 90 weight because it won't shift, but meanwhile 'you'
use MTL which 'is' 90 weight which is 'great stuff'.

So just what the heck is it?

'I' know to use the GL4 'gear oil' for transmissions and to make sure
it doesn't have the limited slip additive for differentials.

'I' could only find the GL4 diff fluid once when changing oil so used
it. My shifter stopped working shortly after.

'I' then went and found tranny gear oil which only came in a semi
synthetic at my local parts store, all the 'regular' gear oil had the
limited slip or friction modifiers in, and now I have a sweet smooth
shift.

Mike

Jerry McG wrote:
>
> Thanks, Jerry. If he's in a cold climate he may want to consider the 70w-80
> fort improved cold shifting. I put the original fill of Red Line MTL in my
> '94 YJs AX15 at 30k miles. I changed it last year as part of the 60k
> mainenance and noted the drain plug magnet didn't have a single flake of
> metal on it. Great stuff!
>
> The owners manuals for the YJs and XJs through at least '96 also called for
> a 75w-90 GL5. I'm not sure when DC caught on and started using the GL3, but
> before that MTL was about the only thing available that would stop the
> synchros.
>
> The 75w-90 GL3 sold by DC is quite pricey but works well. I put it in my '96
> YJs AX15 three years ago and it immediately eliminated hard cold shifitng.
> When I looked this a few months ago the dealer came up with two different
> gear oil part 3's, one recommended for the AX15, another for the NV3550.
> They claim to have used the latter with success in the AX15, but if one is
> ordering this stuff might as well get the correct number.
>
> "Jerry Bransford" <jerrypb@cox.net> wrote in message
> news:VjjOc.4251$Xn.52@fed1read05...
> > It calls for a 75W-90 GL-3, and there were some years when the shop
> manuals
> > incorrectly called for a 75W-90 GL-5. Redline's MT-90 is a 75W-90 GL-4,
> MTL
> > is 70W-80 GL-4. If you go with Redline, MT-90 is the correct viscosity.
> >
> > Jerry
> > --
> > Jerry Bransford
> > PP-ASEL N6TAY
> > See the Geezer Jeep at
> > http://members.cox.net/jerrypb/
> > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > news:cecdh601c6u@enews4.newsguy.com...
> > > Mike,
> > >
> > > The original manuals called for a 75w-90 GL5 oil and were corrected by
> > tech
> > > service bulletin years ago. Any 80w-90, even if a lower sulphur GL4, is
> > far
> > > too heavy a lubricant for an AX15 or NV3550. I believe Redline MTL is a
> > > 70w-80 GL4.
> > >
> > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > news:41096C62.7A63CE5E@sympatico.ca...
> > > > Sorry if I got mouthy.
> > > >
> > > > It is still 80W90 gear oil he needs. You are mixing up terms.
> > > >
> > > > The GL rating has nothing to do with the weight of 80W90.
> > > >
> > > > Mike
> > > >
> > > > Jerry McG wrote:
> > > > >
> > > > > Mike,
> > > > >
> > > > > I find your description of my assitance to this guy offensive and
> > > > > uncharacteristic of you. What I stated is fact. The AX15 can not
> > > tolerate
> > > > > 80w-90 GL5 gear oil. DC recommends a special GL3 (no sulphur) oil
> > > available
> > > > > from Jeep dealers. They also make a special GL3 oil for the NV3550,
> > > which
> > > > > has the same issue re: GL5 oils.
> > > > >
> > > > > If he uses any form of GL5 gear oil he will experience difficult to
> > > > > impossible shifting (esp. in extreme cold) and substantial gear
> clash.
> > > Sorry
> > > > > if my reply offended you, it's just the facts.
> > > > >
> > > > > "Mike Romain" <romainm@sympatico.ca> wrote in message
> > > > > news:41092D32.D9F68E4B@sympatico.ca...
> > > > > > He just fed you a pile of BS. Not much to thank him for.
> > > > > >
> > > > > > Your transfer case takes ATF and your tranny takes 80W90 GL4 'gear
> > > oil'.
> > > > > >
> > > > > > Mike
> > > > > > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > > > > > 88 Cherokee 235 BFG AT's
> > > > > >
> > > > > > Brian Hubley wrote:
> > > > > > >
> > > > > > > Thanx Jerry
> > > > > > >
> > > > > > > "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> > > > > > > news:ce9ko42im7@enews1.newsguy.com...
> > > > > > > >
> > > > > > > > "Brian Hubley" <brianhubley422@earthlink.net> wrote in message
> > > > > > > > news:7hONc.16881$iK.10045@newsread2.news.atl.earth link.net...
> > > > > > > > > I have a 91 YJ 4.0L manual with alot of miles I bought not
> to
> > > long
> > > > > ago.
> > > > > > > I
> > > > > > > > > would like to change the fluid in the trans and transfer
> case.
> > I
> > > was
> > > > > > > told
> > > > > > > > 80
> > > > > > > > > 90 for the trans, and I haven't checked on the transfer case
> > > yet.
> > > > > > > Someone
> > > > > > > > > else told me it might need automatic fluid or a different
> type
> > > of
> > > > > fluid
> > > > > > > > for
> > > > > > > > > the trans so I haven't done anything yet. I don't have the
> > > manual of
> > > > > > > > course.
> > > > > > > > > What should I do? Any web resource's out there?
> > > > > > > > >
> > > > > > > > > Would Daimler Chrysler know? I have been told they only go
> > back
> > > so
> > > > > many
> > > > > > > > > years?
> > > > > > > > >
> > > > > > > > > Any suggestions would be a great help to me.
> > > > > > > > >
> > > > > > > > > -Brian
> > > > > > > >
> > > > > > > > DO NOT put 80w-90 in your transmission. It requires a GL3 or
> GL4
> > > (low
> > > > > or
> > > > > > > no
> > > > > > > > sulphur) gear oil, other wise the synchros will not be able to
> > > > > function
> > > > > > > > properly and you'll get serious cold gear clash when shifting.
> > DC
> > > has
> > > > > a
> > > > > > > > special gear oil for AX15s, plus another for the later NV3550
> > used
> > > in
> > > > > the
> > > > > > > > TJs. Check with your local dealer. Alternatively, you can use
> > > Redline
> > > > > MTL.
> > > > > > > > I've used it in my '94 YJ for years and swear by it.
> > > > > > > >
> > > > > > > >
> > >
> > >
> >
> >

Re: Correct Trans and diff fluid for a YJ

> You are still confusing as ----. ;-) >

I guess so, 'cuz we have no idea idf you're talking about me, Bransford or
both of us.

> Now you say it's 'ok' to use redline GL4, but don't do it because it's
supposed to be GL3 which redline doesn't make, but use redline because it is
better. <

Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a 75
weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a 70w-80
GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec for
an AX5 or 15.
>
> Oh and 'don't use 90 weight because it won't shift, but meanwhile 'you'
use MTL which 'is' 90 weight which is 'great stuff'.<

Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a 75w-90,
that is, a 75 weight oil.

> So just what the heck is it?

How many more times do we have to spell it out?

> 'I' know to use the GL4 'gear oil' for transmissions and to make sure it
doesn't have the limited slip additive for differentials.>

Now we're getting somewhere, partiularly in an AX5 or 15.

> 'I' could only find the GL4 diff fluid once when changing oil so used it.
My shifter stopped working shortly after.>

Likely unrelated to the GL4.

> 'I' then went and found tranny gear oil which only came in a semi
synthetic at my local parts store, all the 'regular' gear oil had the
limited slip or friction modifiers in, and now I have a sweet smooth shift.<

You don't have an AX15.

Re: Correct Trans and diff fluid for a YJ

Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
75W is its' weight when cold... and the 'W' means Winter. Same with 70W-80,
it's an 80 weight when at its normal operating temperature and a 70 weight
when cold. :)

Jerry
--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/
"Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
news:ceeg6u0ga7@enews3.newsguy.com...
> > You are still confusing as ----. ;-) >
>
> I guess so, 'cuz we have no idea idf you're talking about me, Bransford or
> both of us.
>
> > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> supposed to be GL3 which redline doesn't make, but use redline because it
is
> better. <
>
> Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
75
> weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a 70w-80
> GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec for
> an AX5 or 15.
> >
> > Oh and 'don't use 90 weight because it won't shift, but meanwhile 'you'
> use MTL which 'is' 90 weight which is 'great stuff'.<
>
> Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
75w-90,
> that is, a 75 weight oil.
>
> > So just what the heck is it?
>
> How many more times do we have to spell it out?
>
> > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
it
> doesn't have the limited slip additive for differentials.>
>
> Now we're getting somewhere, partiularly in an AX5 or 15.
>
> > 'I' could only find the GL4 diff fluid once when changing oil so used
it.
> My shifter stopped working shortly after.>
>
> Likely unrelated to the GL4.
>
> > 'I' then went and found tranny gear oil which only came in a semi
> synthetic at my local parts store, all the 'regular' gear oil had the
> limited slip or friction modifiers in, and now I have a sweet smooth
shift.<
>
> You don't have an AX15.
>
>
>

Re: Correct Trans and diff fluid for a YJ

The "cold" rating of an oil (i.e., "70w-x") is an oils actual petroleum
viscosity, the other rating (i,e., "Xw-90") is its "petroleum equivalent"
rating at average operating temp and is simply a rating based upon the
effectiveness of its additives.

Thus, a 75w-90 is actually a thin 75 weight oil when cold, but becomes the
"equivalent" of a 90 weight oil when hot. Same with multi-vis motor oil.

Most wear and shifting problems occur when a unit is cold. Thus, because of
it's superior flowing capabilities, a lighter oil is best under that
condition. However, under higher temps and load a higher viscosity (90w) is
better. To get the best of both worlds petroleum engineers start with a
light weight base stock, then introduce additives that increase its
capabilities under heat and pressure.

The sulphur content of gear oils adds a complication: higher sulphur content
(i.e., GL5) in a gear oil is an advantage when the oil is under pressure,
such as when it's squeezed between a ring and pinion. Unfortunately, that
very advantage becomes a disadvantage re: synchronizer rings, which must
have enough friction capability to stop spinning gears to avoid gear clash.
High sulphur content oils compromise that function. Thus, engineers specify
lower sulphur (GL3 or CL4) oil in transmissions to keep cold synchros happy.

This stuff is really easy to see. Compare a bit of 75w-90 gear oil to
straight 90w and it's easily apparent which is the lighter oil. You can also
easily smell the difference between a GL5 and GL3 oil, the GL5 stuff stinks
of rotten eggs to high heaven, the GL3 stuff smells more like motor oil.

"Jerry Bransford" <jerrypb@cox.net> wrote in message
news:RWBOc.4856$Xn.1978@fed1read05...
> Jerry, a 75W-90 is a 90 weight lube at normal operating temperature. The
> 75W is its' weight when cold... and the 'W' means Winter. Same with
70W-80,
> it's an 80 weight when at its normal operating temperature and a 70 weight
> when cold. :)
>
> Jerry
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.cox.net/jerrypb/
> "Jerry McG" <gmcgeorge.remove@frontier.net> wrote in message
> news:ceeg6u0ga7@enews3.newsguy.com...
> > > You are still confusing as ----. ;-) >
> >
> > I guess so, 'cuz we have no idea idf you're talking about me, Bransford
or
> > both of us.
> >
> > > Now you say it's 'ok' to use redline GL4, but don't do it because it's
> > supposed to be GL3 which redline doesn't make, but use redline because
it
> is
> > better. <
> >
> > Nope, you're not paying attention. DC recommnds a GL3 75w-90 (which is a
> 75
> > weight oil, not 90w.) GL3 has no sulphur additive at all, GL4 is low
> > sulphur. Redline makes 2 oils for manaul trans: 1) MTL, which is a
70w-80
> > GL4, and MT90, which is a 75w-90 GL4. MT90 would be closest to DC spec
for
> > an AX5 or 15.
> > >
> > > Oh and 'don't use 90 weight because it won't shift, but meanwhile
'you'
> > use MTL which 'is' 90 weight which is 'great stuff'.<
> >
> > Pay attention: MTL is a 70w-80, that is, a 70 weight oil. MT90 is a
> 75w-90,
> > that is, a 75 weight oil.
> >
> > > So just what the heck is it?
> >
> > How many more times do we have to spell it out?
> >
> > > 'I' know to use the GL4 'gear oil' for transmissions and to make sure
> it
> > doesn't have the limited slip additive for differentials.>
> >
> > Now we're getting somewhere, partiularly in an AX5 or 15.
> >
> > > 'I' could only find the GL4 diff fluid once when changing oil so used
> it.
> > My shifter stopped working shortly after.>
> >
> > Likely unrelated to the GL4.
> >
> > > 'I' then went and found tranny gear oil which only came in a semi
> > synthetic at my local parts store, all the 'regular' gear oil had the
> > limited slip or friction modifiers in, and now I have a sweet smooth
> shift.<
> >
> > You don't have an AX15.
> >
> >
> >
>
>