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Unread 08-13-2011, 04:43 PM   #1
barryjohnsonjr
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Best axle ratio please

I have a 95 YJ. B.T.W I love Square lights. In a class of it's own. O.k so let me get to the point. What is the best gear ratio for a 2.5, 5 speed with 33x12.5? With factory gears I have to cruise in 4th gear to stay at 55mph running at 2500 R.P.M. If I shift to 5th gear it slows down quickly. especially with a strong head wind. I plan on doing a v8 swap in the near future with a turbo 350 trans and an adapter kit for the transfer case. Should I wait to change gears? And if I should wait, What gears for the v8. I don't spend a lot of time on the trail, Mostly for the street and high way use. This is my First jeep so I have a lot to learn but I have always wanted one and finally I do and I knew it would be a YJ because it's different......Just like me. Thanks for your help on this issue.

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Unread 08-13-2011, 05:39 PM   #2
GetLifted
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definitely wait on gears until you do that v8 swap or you might just be going back to 4.10s (i assume thats whats in there?)
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Unread 08-13-2011, 06:22 PM   #3
Joe Dillard
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I'm gunna go ahead & move your thread to the YJ Tech section where you'll more than likely get better exposure/more respones.
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Unread 08-13-2011, 06:28 PM   #4
srdart67
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How near is the V8 going in? anything over a few months, what your running would make me insane. If you buy gears you can always sell them when your ready and for what your looking for they wouldnt be hard to get rid of at all!
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Unread 08-13-2011, 06:42 PM   #5
EZAces
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I like my 5.88s
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Unread 08-14-2011, 08:51 AM   #6
Sawicki4wd
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Strange. I have stock gears with 35s and in 4th I can easily hold 65-70 at 2500 and on the long flat spots I can hit 75 in 5th at 2000
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Unread 08-14-2011, 08:57 AM   #7
barryjohnsonjr
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Thanks for the info guy's. I am new to this forum also so please bear with me. As for as the v8 swap, sometime in the new year after my boat project. I have champion dreams on a mad dog budget. Everybody says it would be best to go with a modern fuel injected swap but I am a little unsure. I am still a fan of a carb based engine, Well the simplicity of it anyway. Was going to buy a donor vehicle but every thing people want is just to dang high. Oh well till next ride.
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Unread 08-14-2011, 09:48 AM   #8
RockWoRM
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Quote:
Originally Posted by barryjohnsonjr View Post
Thanks for the info guy's. I am new to this forum also so please bear with me. As for as the v8 swap, sometime in the new year after my boat project. I have champion dreams on a mad dog budget. Everybody says it would be best to go with a modern fuel injected swap but I am a little unsure. I am still a fan of a carb based engine, Well the simplicity of it anyway. Was going to buy a donor vehicle but every thing people want is just to dang high. Oh well till next ride.
Since you are new to YJs, do some searchs on 'turdy 5'.

If you're going to put a V8 in that thing, and even if you're not an extreme wheeler, that is still a lot of torque going back to a D35 riding on 33's. You might want to research an 8.8 w/4.10 gears. If you have the wrench skills to throw in a V8, then doing an 8.8 already in your current gear ratio should'nt be too hard for ya.

just my .o2



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Unread 08-14-2011, 11:35 PM   #9
Sawicki4wd
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I agree a v8 is just a little powerful for the d35. You could also look for an 8.25 out of a Cherokee. Those came in 4:10s and have the same bolt pattern and with
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Unread 08-15-2011, 12:53 AM   #10
Tom95YJ
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Quote:
Originally Posted by Sawicki4wd View Post
I agree a v8 is just a little powerful for the d35. You could also look for an 8.25 out of a Cherokee. Those came in 4:10s and have the same bolt pattern and with

since your looking to do a V8 swap I'd look for a ford 8.8 with 4.10's from a 96 or newer explorer. they will handle the extra power and can be built to be stronger than a Stock D60. If you are going to hold off on the swap for a while I would still look for the 8.8 and regear your current axles to 4.88's you'll get use of 5th gear and be able to keep up with traffic on the hiway in 75mph zones. As for the 8.25 the OP has suggested,
The 8.25 is still a turd its not much stronger than a D35, its Weaker than a D44 and I have yet to see one with factory 4:10's. Then with you having a 4 banger if you do regear it your limited to 4.56 which wont work out on a 4banger with a manual since you'll need 4.88's Sure it has bigger axles tubes than a D44 and its lighter, but the 8.8 has bigger tubes, bigger ring gears, bearings, disk brakes, can go to 35 spline, better housing and better aftermarket support.


Here's some Axle compairsons also



Axle ratings
January edition of Fourwheeler, page 60.

COT: Continuous output torque rating
MOT: Maximum output torque rating

Dana 35 rear axle COT: 0870 MOT: 3480
Dana 44 rear axle COT: 1100 MOT: 4460

Ford 8.8 31spline COT: 1360 MOT: 5100

Dana 60 semifloat COT: 1500 MOT: 5500
************************************************** ****


Warn Axle Test
Axle................Dana 35......Dana 44.......Ford 8.8
Weight............155............167.............1 74
RingGearDia......7.56...........8.5..............8 .8
Pinion Dia.........1.4(26sp)....1.37(30sp)....1.62(30sp)
Axle Dia...........1.16(27sp)..1.30(30sp)....1.32(31sp)
Tube Dia..........2.5"............2.75"...........3.25"
Disks...............no.............Rubicons....... all 95+
Break Strength..4161 ftlb....5982 ftlb.......6200+ ftlb**

**The machine Warn used to test axle breakage maxed out at 6200; at which
the 8.8 had yet to break. Estimates of 8.8 breakage were in the 6400 range.
************************************************** ****

OEM &amp; aftermarket Axle Shaft Ratings
(seems very conservative)

O.E.M Dana 44 30-spline shafts - 2835 lb/ft
O.E.M Ford 88 31-spline shafts - 3725 lb/ft
Super Dana 44 33-spline shafts - 3969 lb/ft
O.E.M Dana 60 35-spline shafts - 4557 lb/ft
Yukon Ford 88 31-spline shafts - 5131 lb/ft
Yukon Dana 60 35-spline shafts - 6380 lb/ft
************************************************** ****
Chrysler 8.25 - 27 spline, 1.17" diameter shafts, 8.25" ring gear, 3" axle tube
Chrysler 8.25 - 29 spline, 1.21" diameter shafts, 8.25" ring gear, 3" axle tube
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Unread 08-15-2011, 06:59 AM   #11
Sawicki4wd
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Quote:
Originally Posted by Tom95YJ

since your looking to do a V8 swap I'd look for a ford 8.8 with 4.10's from a 96 or newer explorer. they will handle the extra power and can be built to be stronger than a Stock D60. If you are going to hold off on the swap for a while I would still look for the 8.8 and regear your current axles to 4.88's you'll get use of 5th gear and be able to keep up with traffic on the hiway in 75mph zones. As for the 8.25 the OP has suggested,
The 8.25 is still a turd its not much stronger than a D35, its Weaker than a D44 and I have yet to see one with factory 4:10's. Then with you having a 4 banger if you do regear it your limited to 4.56 which wont work out on a 4banger with a manual since you'll need 4.88's Sure it has bigger axles tubes than a D44 and its lighter, but the 8.8 has bigger tubes, bigger ring gears, bearings, disk brakes, can go to 35 spline, better housing and better aftermarket support.

Here's some Axle compairsons also

Axle ratings
January edition of Fourwheeler, page 60.

COT: Continuous output torque rating
MOT: Maximum output torque rating

Dana 35 rear axle COT: 0870 MOT: 3480
Dana 44 rear axle COT: 1100 MOT: 4460

Ford 8.8 31spline COT: 1360 MOT: 5100

Dana 60 semifloat COT: 1500 MOT: 5500
************************************************** ****

Warn Axle Test
Axle................Dana 35......Dana 44.......Ford 8.8
Weight............155............167.............1 74
RingGearDia......7.56...........8.5..............8 .8
Pinion Dia.........1.4(26sp)....1.37(30sp)....1.62(30sp)
Axle Dia...........1.16(27sp)..1.30(30sp)....1.32(31sp)
Tube Dia..........2.5"............2.75"...........3.25"
Disks...............no.............Rubicons....... all 95+
Break Strength..4161 ftlb....5982 ftlb.......6200+ ftlb**

**The machine Warn used to test axle breakage maxed out at 6200; at which
the 8.8 had yet to break. Estimates of 8.8 breakage were in the 6400 range.
************************************************** ****

OEM & aftermarket Axle Shaft Ratings
(seems very conservative)

O.E.M Dana 44 30-spline shafts - 2835 lb/ft
O.E.M Ford 88 31-spline shafts - 3725 lb/ft
Super Dana 44 33-spline shafts - 3969 lb/ft
O.E.M Dana 60 35-spline shafts - 4557 lb/ft
Yukon Ford 88 31-spline shafts - 5131 lb/ft
Yukon Dana 60 35-spline shafts - 6380 lb/ft
************************************************** ****
Chrysler 8.25 - 27 spline, 1.17" diameter shafts, 8.25" ring gear, 3" axle tube
Chrysler 8.25 - 29 spline, 1.21" diameter shafts, 8.25" ring gear, 3" axle tube
The 8.25 isn't as strong as a 44 or an 8.8 but it's plenty stronger then the d35 as long as you get the 29 spline one. I have a friend who had a yj with a 383 stroker and he runs the 8.25 and hasnt had any issues and he beats the snot out of it.
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Unread 08-16-2011, 08:01 PM   #12
barryjohnsonjr
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Wow! That is a lot to take in. Very good info on this issue. I can't thank everybody enough with all the input. Sounds like I have my work cut out for me but it will be a fun project. I will be doing all the work myself so I need the info. I know my way around a garage and there is not too much I don't do but it is hard when you don't have the correct knowledge. Right now I can live with what it is as a beer runner. But Can't wait till it's more. Thanks again for all the information.
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