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Unread 11-04-2011, 06:46 PM   #1
ThatJeepGuy
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4.10s 4.56s or 4.88 gears?

My jeep has the 4.0 3speed automatic. I am currently running 33s and I believe my axle ratios are 3.54 which usually came with the 3spd and 4.0? I am in the market to upgrade my rear axle and I need to make a decision on what gear ratio to go for. Should I go for 8.8 with 4.10s and get a d30 out of 4banger? Or just get and 8.8 and swap R&P to 4.56 in it and my 30(expensive)? But I also found a decent deal on a xj d44 powertraxs locker and YJ d30 ARB both 4.88 gears. Would the 4.88 be to deep for 33's and the auto tranny? I have seen charts for this when I did a search but I think they are just for manual?
I also plan on 35's in the future and thought 4.88 would be perfect but I DD my jeep and didn't know how impractical it would be until I get there. Thanks

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Unread 11-04-2011, 07:10 PM   #2
jonzjeepyj
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The best gear for the 4.0L and 33's is the 4.56 gear set. But if your intentions are to go to 35's, do it once and go to 4.88's
You will have a lot of power at the low end and will top out sooner. I don't really think you will notice it topping out as jeeps
don't really need to go much more then 70 anyway.

I think the best gearing for the 4.0L is. . . . .

4.10's -------- 31's
4.56's -------- 33's
4.88's -------- 35's

If you were going to stay at 33's I would say do the 8.8 with 4.10's and find a 4-banger with the dana-30 / 4'10's The
difference would not be substantial enough to warrant the extra money to re gear to 4.56's It would cost much more
to re gear then it would be to swap axles. Since you have the intention to go to 35's, don't waste your time with the
4'56 and re gear to 4.88's
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Unread 11-04-2011, 07:15 PM   #3
jsawduste
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http://www.grimmjeeper.com/gears.html

Plug your numbers in and see the results. Also consider your driving habits.

Me with a auto and 33`s. 4.88`s without a doubt
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Unread 11-04-2011, 07:23 PM   #4
ThatJeepGuy
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Quote:
Originally Posted by jsawduste
http://www.grimmjeeper.com/gears.html

Plug your numbers in and see the results. Also consider your driving habits.

Me with a auto and 33`s. 4.88`s without a doubt
Which tranny is in our jeeps? Not sure which one to plug in. Thanks that link is gonna help me a lot.
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No farms no food

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Unread 11-04-2011, 07:26 PM   #5
jsawduste
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Quote:
Originally Posted by ThatJeepGuy View Post
Which tranny is in our jeeps? Not sure which one to plug in. Thanks that link is gonna help me a lot.
TF904 - TorqueFlight Automatic behind the I4 '94-'95, prior to this, the YJ was not offered in an automatic with the I4
TF999 - TorqueFlight Automatic behind the I6

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Unread 11-04-2011, 07:31 PM   #6
jonzjeepyj
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Here is an easy to use chart.

http://www.4wheelparts.com/aux_incl/gear_ratio.html

The chart is based on
65 MPH and a gear ratio of 1:1, on a manual transmission in 4th gear.

Note:
If you have an automatic transmission your RPM will higher due to slippage
in the transmission and the torque converter. With an overdrive transmission
your RPM in overdrive will be 15% to 30% less than indicated.

I have a daily driver and like to stay in that category. According to this chart,
35's with 4.88's is on the high side of the Daily Driver, leaning on the power side
at 3045 RPM's in 4th gear with a manual tranny
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Unread 11-04-2011, 07:48 PM   #7
ThatJeepGuy
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According to the chart jsawdust posted I will be running at around 3grand at 60 mph. I'm thinking that's pretty high until I go 35's. I don't drive on the freeway that often but I do go about 55-60 on the main roads around here. I think if I keep it at 50-55 ill be ok. The.sacrifices we make haha. I need to get a lil Ford fiesta DD so I can just put 40's on my jeep and be happy.

Edit: at 60 with 33's and 4.88 ill be at 2981 rpm. 55 ill be at 2733 rpm.
Not too bad I guess until I go 35's. My steering isn't good enough to go 75 anyway.
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Unread 11-04-2011, 08:01 PM   #8
jonzjeepyj
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Quote:
I need to get a lil Ford fiesta DD so I can just put 40's on my jeep and be happy.
Amen !
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Unread 11-04-2011, 08:01 PM   #9
jsawduste
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Quote:
Originally Posted by ThatJeepGuy View Post
According to the chart jsawdust posted I will be running at around 3grand at 60 mph. I'm thinking that's pretty high until I go 35's. I don't drive on the freeway that often but I do go about 55-60 on the main roads around here. I think if I keep it at 50-55 ill be ok. The.sacrifices we make haha. I need to get a lil Ford fiesta DD so I can just put 40's on my jeep and be happy.
As posted......Depends on your driving style. If you do a lot of "higher" speed driving then a 4.56 might be a better choice. OR if you ever plan on bigger tires (I know you want 35`s) then the gearing will be suited for your needs.

Decisions, decisions
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Unread 11-04-2011, 08:16 PM   #10
ThatJeepGuy
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I think if I can snag these axles for a decent price I'm going with the 4.88's. If not then I guess its back to the drawing board and searching CL for another deal. Or just getting the 8.8 and 4 banger axle and staying 33's with 4.10's. not what I want but o well.
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Unread 11-04-2011, 08:21 PM   #11
jonzjeepyj
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Yup, I tend to be a lead foot and enjoy the power side of the gearing bands.
Ha Ha ! I need to be 2 gears lower with my 35's with my little 2.5L. I'm at
4.88's and need to be at 5.38's. I can't re gear due to my small dana 30. I
decided to re motor to a 4.0L and befit from more true power.
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Unread 11-04-2011, 08:44 PM   #12
ThatJeepGuy
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Quote:
Originally Posted by jonzjeepyj
Yup, I tend to be a lead foot and enjoy the power side of the gearing bands.
Ha Ha ! I need to be 2 gears lower with my 35's with my little 2.5L. I'm at
4.88's and need to be at 5.38's. I can't re gear due to my small dana 30. I
decided to re motor to a 4.0L and befit from more true power.
Yea sometimes when I'm driving in my jeep and I wish I have more power under the hood I think of all the 2.5's out there. Must be rough
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93YJ / 4'' lift / 33'' mtzs / aussie locker in hpd30 / pos d35 in rear(for now) / xrc rock sliders & rear xrc tube fenders tj style/ AJ's offroad rear bumper and tire carrier / LP10000 Superwinch / SQUARE HEADLIGHTS

No farms no food

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Unread 11-04-2011, 08:49 PM   #13
jonzjeepyj
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I have enjoyed my little 2.5L 4 popper but decided to re motor to a 4.0L motor in
stead of re axleing and re gearing. Found a 99 XJ as a donor. will be swapping
over on the 19th of November. wish me luck. LOL
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Unread 11-04-2011, 09:09 PM   #14
ThatJeepGuy
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Quote:
Originally Posted by jonzjeepyj
I have enjoyed my little 2.5L 4 popper but decided to re motor to a 4.0L motor in
stead of re axleing and re gearing. Found a 99 XJ as a donor. will be swapping
over on the 19th of November. wish me luck. LOL
Your gonna do it all in one day? Will it be an auto or 5spd?
__________________
93YJ / 4'' lift / 33'' mtzs / aussie locker in hpd30 / pos d35 in rear(for now) / xrc rock sliders & rear xrc tube fenders tj style/ AJ's offroad rear bumper and tire carrier / LP10000 Superwinch / SQUARE HEADLIGHTS

No farms no food

[url]http://www.jeepforum.com/forum/f12/yj-tube-fender-write-up-1325289/[/url]

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Unread 11-04-2011, 09:20 PM   #15
jonzjeepyj
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No, over that weekend.

What I have . . . .
92 2.5L / AX-5 5-speed / N231J / 164,000 miles

What I'm swapping in . . . . .
99 4.0L / AX-15 5-speed / N231J / 96,000 miles
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