Are 31's too small for 4.10's??
10-05-2004, 12:11 PM
#21
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Hi Jeff,
The formula to compute rpm with tire diameter in inches and speed in
km/h is:
rpm = ( ratio * kmh * 209 ) / diameter
Your pal's Aisin-Warner auto trans has a 0.75 overdrive.
At 110km/h, assuming his 31's are actually 30.5", he should be seeing
around 2000 rpm with his 3.55 diff. A change to 4.10 would give 2300 rpm
at 110 km/h - much better.
What does he have for a transfer case? NP231? Unless he has a 4:1 low
range conversion, the AW4's 2.80 1st gear would really suck when
climbing rocks with 4.10s and the 34 inch swampers. Better to regear
with 4.56 or 4.88, sell the 31s, and buy a set of taller street tires
with a narrow contact patch and a decent snow tread: 33x9.50R15 BFG AT/KO.
Steve
http://xjeep.dyndns.org
Jeff wrote:
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> ----------------------------------------------------------------------------
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
The formula to compute rpm with tire diameter in inches and speed in
km/h is:
rpm = ( ratio * kmh * 209 ) / diameter
Your pal's Aisin-Warner auto trans has a 0.75 overdrive.
At 110km/h, assuming his 31's are actually 30.5", he should be seeing
around 2000 rpm with his 3.55 diff. A change to 4.10 would give 2300 rpm
at 110 km/h - much better.
What does he have for a transfer case? NP231? Unless he has a 4:1 low
range conversion, the AW4's 2.80 1st gear would really suck when
climbing rocks with 4.10s and the 34 inch swampers. Better to regear
with 4.56 or 4.88, sell the 31s, and buy a set of taller street tires
with a narrow contact patch and a decent snow tread: 33x9.50R15 BFG AT/KO.
Steve
http://xjeep.dyndns.org
Jeff wrote:
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> ----------------------------------------------------------------------------
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
10-05-2004, 12:11 PM
#22
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Hi Jeff,
The formula to compute rpm with tire diameter in inches and speed in
km/h is:
rpm = ( ratio * kmh * 209 ) / diameter
Your pal's Aisin-Warner auto trans has a 0.75 overdrive.
At 110km/h, assuming his 31's are actually 30.5", he should be seeing
around 2000 rpm with his 3.55 diff. A change to 4.10 would give 2300 rpm
at 110 km/h - much better.
What does he have for a transfer case? NP231? Unless he has a 4:1 low
range conversion, the AW4's 2.80 1st gear would really suck when
climbing rocks with 4.10s and the 34 inch swampers. Better to regear
with 4.56 or 4.88, sell the 31s, and buy a set of taller street tires
with a narrow contact patch and a decent snow tread: 33x9.50R15 BFG AT/KO.
Steve
http://xjeep.dyndns.org
Jeff wrote:
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> ----------------------------------------------------------------------------
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
The formula to compute rpm with tire diameter in inches and speed in
km/h is:
rpm = ( ratio * kmh * 209 ) / diameter
Your pal's Aisin-Warner auto trans has a 0.75 overdrive.
At 110km/h, assuming his 31's are actually 30.5", he should be seeing
around 2000 rpm with his 3.55 diff. A change to 4.10 would give 2300 rpm
at 110 km/h - much better.
What does he have for a transfer case? NP231? Unless he has a 4:1 low
range conversion, the AW4's 2.80 1st gear would really suck when
climbing rocks with 4.10s and the 34 inch swampers. Better to regear
with 4.56 or 4.88, sell the 31s, and buy a set of taller street tires
with a narrow contact patch and a decent snow tread: 33x9.50R15 BFG AT/KO.
Steve
http://xjeep.dyndns.org
Jeff wrote:
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> ----------------------------------------------------------------------------
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
10-05-2004, 12:44 PM
#23
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Real Jeeps come stock with 5.38s.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
10-05-2004, 12:44 PM
#24
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Real Jeeps come stock with 5.38s.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
10-05-2004, 12:44 PM
#25
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Real Jeeps come stock with 5.38s.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Cherokee-LTD wrote:
>
> The OP says AW4.
> I'd run 4.10's with my AW4 in a second if I could afford the swap right now!
> Some might suggest 34's might be a bit big for 4.10's but it depends mostly
> on what you're into. If he finds 4.10 to low for 31's, run a 32x9.5 for the
> winter but I'd suggest trying them this winter before he sells them.
> -Brian
10-05-2004, 12:47 PM
#26
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Seeing top speed on your I-15 corridor is usually only about fifty
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
10-05-2004, 12:47 PM
#27
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Seeing top speed on your I-15 corridor is usually only about fifty
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
10-05-2004, 12:47 PM
#28
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
Seeing top speed on your I-15 corridor is usually only about fifty
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
max. ;-)
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Kevin in San Diego wrote:
>
> Im running 4.56 gears with 31's and an automatic aw4 tranny. I like it.
> KH
10-05-2004, 02:37 PM
#29
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
4.10s are good for 31s or 32s. Some guys might even go to 33s with them, but
for my money, the 33s are the bottem end of the size to use with 4.56s.
"Jeff" <jrhiltz@av.eastlink.ca> wrote in message
news:Cum8d.76437$vO1.421776@nnrp1.uunet.ca...
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> --------------------------------------------------------------------------
--
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be
running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
>
>
>
for my money, the 33s are the bottem end of the size to use with 4.56s.
"Jeff" <jrhiltz@av.eastlink.ca> wrote in message
news:Cum8d.76437$vO1.421776@nnrp1.uunet.ca...
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> --------------------------------------------------------------------------
--
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be
running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
>
>
>
10-05-2004, 02:37 PM
#30
Guest
Posts: n/a
Re: Are 31's too small for 4.10's??
4.10s are good for 31s or 32s. Some guys might even go to 33s with them, but
for my money, the 33s are the bottem end of the size to use with 4.56s.
"Jeff" <jrhiltz@av.eastlink.ca> wrote in message
news:Cum8d.76437$vO1.421776@nnrp1.uunet.ca...
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> --------------------------------------------------------------------------
--
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be
running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
>
>
>
for my money, the 33s are the bottem end of the size to use with 4.56s.
"Jeff" <jrhiltz@av.eastlink.ca> wrote in message
news:Cum8d.76437$vO1.421776@nnrp1.uunet.ca...
> Posting this for a friend.... Bill you must have a site for RPM tires vs
> gearing??
> Thanks in advance!
> Jeff
> '03TJ
> '95ZJ
> Are 31's too small for 4.10's??
> --------------------------------------------------------------------------
--
> ----
> I am currently debating wether or not to sell my 31" winter tires or not.
> Installin 4.10's in near future and would like to know if the engine is
> gonna turn up too much for highway use!
> 4.0L engine with Weber Carb, mated to AW4 trans.
> Currently running 3.55's and it gets along just about right. Will be
running
> 34" Swampers for trail but i like my winter tires for snow driving!!
> Help me!
> Justin
>
>
>