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Old 01-07-2010, 08:11 AM   #1
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Gotta gear this b*tch up!

So I took my jeep to the parking lot the other day and spun the wheels to see if maybe the guy before me or the guy before him put gears in this thing. Well it looks as though the stock 3.07 gears are in there. I was looking for a set of 4.88's to put in and was wondering what is involved. I heard somewhere that I need a new case. Not sure what that means??? A whole new axle?? Anyone have any ideas on the best place to shop??? Also... how hard is this project for the shade tree mech?? Oh... its got a d35 in the back so should I be considering going another route?? Any help is def. appreciated.
Thanks
Rick
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1997 Jeep Wrangler Sport
I6 4.0 Automatic
168,000 miles upon purchase
4" Rough Country Suspension Lift
1-2"? Body Lift
35x12.5x15 Pro Comp Tires
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Old 01-07-2010, 09:01 AM   #2
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Nope no case or axle housings... mainly the carrier assembly, gear & pinions and then a master install kit that will have all the bearings and crush sleeves. The biggest or most important thing is trying to set the proper backlash on the carrier set-up.

Most drivetrain shops will probably quote you about $750 to $1000 for installation and they warranty the install as well, or atleast most do.

If it has 35's hard to believe the stock 3.07's would be in there... when driving at hiways speeds does it seem slushish or slow to get to speeds. There is a calculation or conversion out there for figuring out the gearing based on tire size and revolution of the wheel. I used to have it marked, but cant remember where I found it.

Chris

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Old 01-07-2010, 09:19 AM   #3
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Gear Ratio Calculator

Speedometer Gear Applet

4x4 related Calculators, Crawl Ratio, Gears Tires Sizes, etc..
here's one that does it by number of teeth, if you remove diff cover


Chris
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Old 01-07-2010, 09:36 AM   #4
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really your gearing it down...
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Old 01-07-2010, 10:49 AM   #5
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I would go with a Ford 8.8 axle swap... almost/same strength as the dana44. My neck of the woods I can get a ford 8.8 from a junkyard for 80$.. I'm surprised your jeep is still running with those 3.07s
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Old 01-07-2010, 10:59 AM   #6
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With the I6 and an auto you sure it does not have 3.73?
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Old 01-07-2010, 02:37 PM   #7
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Not to dispute board wisdom but I'm pretty sure you have to change the case. Using your case with 3.07s you can only go down to 3.55 gears. Anything lower (3.73 - 4.xx) requires a different case, gears, and I think axles. Quadratec describes what has to be done at Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec.
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Old 01-07-2010, 04:35 PM   #8
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Originally Posted by Chip4bc View Post
Not to dispute board wisdom but I'm pretty sure you have to change the case. Using your case with 3.07s you can only go down to 3.55 gears. Anything lower (3.73 - 4.xx) requires a different case, gears, and I think axles. Quadratec describes what has to be done at Jeep Parts, Jeep Accessories & Jeep Soft Tops From The Jeep Parts Experts - Quadratec.
The axles are OK,but the carriers need to be replaced,along with ring and pinion for gearing for those 35,s.I had my 97 tj re-geared from 3.07 to 4.11 last May,and it was costly because of the carriers.Now Im running enough lift to make my 33x12.5,s look small,so Im saving up for 35,s,and maybe a regear to 4.88...
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Old 01-07-2010, 05:46 PM   #9
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well... thanks for the heads up.... does seem a bit costly with what quadratech says. the ford 8.8 sounds like a good idea... just gotta find one. still have to regear but at least i get stronger axle in there. would the ring and pinion for the ford be the same as for a jeep or do i have to shop somewhere else to find ford compatible gears??? after that ill still be in for the new carrier and ring and pinion for the front but i guess ill have to deal. What trucks does this 8.8 come out of?? ohhh and thanks for the help you smart bastards
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1-2"? Body Lift
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Old 01-07-2010, 05:52 PM   #10
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oh and chiro2736. i checked the tag on the rear axle and it say 3.07. I also spun the tires to check to see if any previous owner changed them which he did not
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4" Rough Country Suspension Lift
1-2"? Body Lift
35x12.5x15 Pro Comp Tires
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Old 01-07-2010, 09:22 PM   #11
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The 8.8 comes out of ITHINK 95-99 or 2000 ford explorers. I can't wait to go to the junkyard and get that heap out.
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Old 01-07-2010, 10:02 PM   #12
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I think the 8.8 is in all the ford explorers since like 93 atleast probably older models too. Its just the drum and disk brakes are whats different.
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Old 01-07-2010, 10:07 PM   #13
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what is the common stock ratio on an 8.8?
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Old 01-07-2010, 10:13 PM   #14
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3.55s I believe but no idea
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Old 01-07-2010, 11:14 PM   #15
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The ones I saw at the yard were both 4.11s...
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Old 01-07-2010, 11:49 PM   #16
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mightve been out of an auto
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Old 01-08-2010, 09:06 PM   #17
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hey... thanks for the insight everyone... gunna be on the look out for the 8.8 axle... it would be easier to have disc brakes in the back too. ill keep you all informed cuz im gettin a lil scared of bustin this axle.
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I6 4.0 Automatic
168,000 miles upon purchase
4" Rough Country Suspension Lift
1-2"? Body Lift
35x12.5x15 Pro Comp Tires
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Old 01-08-2010, 09:46 PM   #18
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disc are year 96+ for explorers

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