Gearing question

Newbies, and basic Stroker Recipes... Get started with your first stroker here!!
Post Reply
yenkoz
Posts: 2
Joined: July 15th, 2014, 10:32 am
Vehicle Year: 1990
Vehicle Make: Jeep
Vehicle Model: Cherokee

Gearing question

Post by yenkoz »

I have a 1990 XJ with a AW4 and plan on going with 33x10.5x15 tires. From everything I have read with the stock 4.0 4.56 gears are the best overall gears. Would this change with a mild stroker? The vehicles main use will be a daily driver with mild off road driving.
sly-jeeper
Donator
Donator
Posts: 150
Joined: December 29th, 2013, 9:17 am
Stroker Displacement: 4.6L
Vehicle Year: 1994
Vehicle Make: jeep
Vehicle Model: cherokee
Location: Kaleva, mi

Re: Gearing question

Post by sly-jeeper »

With 33's and 4.10's it will return your effective ratio back to stock. So that's what I recommend for a daily driver. 4.56 and 33's with be like 33's with 3.55's in 3rd. Gear for cruzing comparison.
User avatar
SilverXJ
Global Moderator
Global Moderator
Posts: 5789
Joined: February 14th, 2008, 7:14 am
Stroker Displacement: 4.6L
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Radford, Va

Re: Gearing question

Post by SilverXJ »

Here is an excellent Gear ratio calc: http://www.grimmjeeper.com/gears.html
woodjeep
I made it to triple digits!
I made it to triple digits!
Posts: 153
Joined: July 15th, 2009, 5:50 pm
Stroker Displacement: 4.6
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Gearing question

Post by woodjeep »

I run 31 revo's on the stock 3.55 stroked to approx 4.7. I would wish for a set of 4.10's it runs nice on the flats but when I hit medium hills I do not turn enough rpm so my vaccum drops close to zero and I start to lug. It runs better in 3rd instead of OD in these conditions. I think I worked out once that 3.55 in 3rd was close to 4.10 in OD . I run 2000 rpm @ 70 mph and draw about 10-12 inches on my vacuum gauge . Adding a vacuum gauge is easy and let's you know how your engine is breathing
charley3
Making Progress
Making Progress
Posts: 60
Joined: June 20th, 2013, 11:36 pm
Vehicle Year: 1999
Vehicle Make: Jeep
Vehicle Model: XJ

Re: Gearing question

Post by charley3 »

I'm new to strokers topics, but I have regeared two TJs and want to regear my XJ.

With AW4 and 4L, I'd recommend 3.73 for 30, 4.1 for 31, 4.55 for 32, 4.88 for 33.

Since you"ll be stroked, 4.56 would work well with 33s. Though 4.88 would also work well IMO.

I would NOT use 4.1 for 33s. I think it wouldn't be near low enough.

A stroker has a lot of grunt, but you still need to regear low enough so the transmission and drivetrain aren't straining to much.

I live where there is a lot of level highway running N/S, and mountain highway running W/E. So my advice is for a mix of level and mountain highways. If you follow my gearing advice you'll have a nice all purpose DD for any type highways and will be good off road too, and your transmission and drivetrain will thank you for making their lives easier and longer.
charley3
Making Progress
Making Progress
Posts: 60
Joined: June 20th, 2013, 11:36 pm
Vehicle Year: 1999
Vehicle Make: Jeep
Vehicle Model: XJ

Re: Gearing question

Post by charley3 »

sly-jeeper wrote:With 33's and 4.10's it will return your effective ratio back to stock.
I politely disagree. He has an AW4.
User avatar
Cheromaniac
I live here
I live here
Posts: 3180
Joined: March 8th, 2008, 12:58 pm
Stroker Displacement: 4563cc
Vehicle Year: 1992
Vehicle Make: Jeep
Vehicle Model: Cherokee
Location: Cyprus
Contact:

Re: Gearing question

Post by Cheromaniac »

An AW4-equipped XJ comes with 3.55 axle gears and 27.7" tires in stock form.
If you have a stock 4.0 and want to run bigger tires, you'll need to run higher ratio axle gears but keep in mind that bigger tires add more rolling resistance, more aerodynamic drag, and require more engine torque to turn them. Therefore you should aim to bring back the gearing close to stock but preferably slightly shorter (i.e. higher ratio) to compensate for the aforementioned factors.

3.55 with stock tires, 4.10 with 30's or 31's, 4.56 with 32's or 33's, 4.88 with 35's.

A 4.6L stroker will be putting down more torque than a stock 4.0 so in that case you could afford to use the next numerically lower ratio to lower the cruising rpm and improve gas mileage.
1992 XJ 4.6 I6 - 5MT - Stroker build-up, Stroker "recipes" Sold
1995 Mustang GT - 4AT - Modded Sold
2006 Mustang GT - 5MT - Modded Midlife Crisis Car :mrgreen:
yenkoz
Posts: 2
Joined: July 15th, 2014, 10:32 am
Vehicle Year: 1990
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Gearing question

Post by yenkoz »

The main reason I was considering 4.10s instead of 4.56s was I would make more power down low with a 4.6 stroker. And it would also keep the rpm's down, which really helps long stroke motors longevity wise in the long run. I just didn't want to gear with 4.10s only to find out it is a gutless dog on the interstate. But I'm not expecting it to win an races by any means. As long as it can downshift and maintain 75 mph on big hills I'll be happy (I live in Montana).
sly-jeeper
Donator
Donator
Posts: 150
Joined: December 29th, 2013, 9:17 am
Stroker Displacement: 4.6L
Vehicle Year: 1994
Vehicle Make: jeep
Vehicle Model: cherokee
Location: Kaleva, mi

Re: Gearing question

Post by sly-jeeper »

Cheromaniac has the best response. I personally have no problems running 3:55's with 33's and a 4.0, but I guess its all what you expect. Like I said before with a dd, stroker, aw4, and 33's I recommend 4:10's for fuel economy and lower revs but 4:56 or 4:88 for someone who wheels often,pulls a lot of big hills, or pulls a heavy trailer.
Cerveja
Noob
Noob
Posts: 15
Joined: October 25th, 2013, 10:54 am
Stroker Displacement: 4.7L
Vehicle Year: 2000
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Gearing question

Post by Cerveja »

Okay, so I have two jeeps that are both on Dana 44's and selectable lockers. The '01 TJ is running a 4.10 with 33's and a 5 speed manual 4L. Seems like a really good mix and runs down the highway 70-90 mph with no problem and stays under 3,000 rpm. The '01 XJ allegedly has a mild stroker and an auto trans. I had 4.10's with 35 inch wheels and it would gear hunt on the highway at the slightest incline. I switched to 4.88's last year and she is very happy, purrs down the highway and never gears down on the hills. Gas mileage even went up just a bit cause the engine was more consistent.
djergensen
Noob
Noob
Posts: 13
Joined: June 15th, 2012, 6:52 pm
Stroker Displacement: 4.6
Vehicle Year: 1994
Vehicle Make: Jeep
Vehicle Model: Cherokee

Re: Gearing question

Post by djergensen »

This is a great post. Thanks guys
jeepxj3
Movin on up ^
Movin on up ^
Posts: 370
Joined: December 5th, 2013, 1:55 am
Stroker Displacement: 4.6
Vehicle Year: 1998
Vehicle Make: jeep
Vehicle Model: xj

Re: Gearing question

Post by jeepxj3 »

Auto or 5 speed makes a difference.

I have 33s, auto, mild mod 4.0 and 4.56 and it is too low for DD and cruising. It is a terrible combination, especially with half worn tires which are closer to true 32s now.
Will be putting on 35s and it should be much better.

With the auto and 4.0, 31s and 3.55, 32-33s and 4.10, 35s and 4.56.
With the extra torque of strokers, you won't need to gear as low as you would think.
Post Reply

Who is online

Users browsing this forum: Amazon [Bot] and 9 guests