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-   -   Rear end swap (http://www.wranglerforum.com/f290/rear-end-swap-23736.html)

catfish 12-05-2008 11:10 AM

Rear end swap
 
hello all, i'm a little new to the whole rear end thing so please keep this in mind,
what i have is a 92 wrangler with a d35 rear end with 3:07 gears in it and it is blown apart now and a mistake has got me in a corner with it, so it looks as if i have to remove the whole rear end any how, so i was thinking about just trying to find a rear end that has 4:88 gears in it like a d44, so if i do this this will i need to do any mods to it to get to bolt right in? also will i need to get the same exact front also? and since i will be looking all around what year and make vehicle should i be looking for with this setup? Thank you for your time and advice in advance.

flattietj 12-05-2008 11:55 AM

put in an 8.8 and regear the front end......u can find 8.8s with up to 410s.....are 488s necessary or are you just wanting them.......if you are looking for a 44 set up you may need to look for wagoneer 44s and find a rare driver drop front 44 but it will most likely be 6 lug so you will need new wheels.....the 8.8 swap is the cheapest and easiest swap you can do in a yj

Coyote_94YJ 12-05-2008 12:08 PM

Have you considered a ford 8.8? There is only about 5/8" difference in width per side and most have the same bolt pattern as the jeep. If you get one off a 96 or newer ford exploder they will also have disc brakes and some of them even came with LSD (the diff not the drug...lol).

The 8.8 is also larger and stronger than the D44. The D44 has a 8.5" ring gear where as the 8.8 has...well...an 8.8" ring gear and the axle shafts are slightly larger.

And to answer your question, yes your front end gear ratio will have to match what ever ratio is in the rear end you select.

Either way you slice it, there is going to be grinding and welding involved to get a new axle in there. Spring perches will have to be welded on and if there are brackets in the way those will have to be removed. Shock mounts will also need to be addressed....more grinding and welding.

whitebuffalo 12-05-2008 12:30 PM

just to clarify what has already been said.

you can swap to a dana 44 out of an XJ (there was a narrow window here of rear 44s). that would be more or less a straight swap, but good luck finding one.

you could swap front and rear to whatever the hell you want, obviously this will cost more

you could swap to a ford 8.8 out of an explorer. this will require a little welding, but your factory wheels will work, you dont have to touch the front, they're fairly cheap (~$250) and plenty beefy.

flattietj 12-05-2008 12:37 PM

i ran an 8.8 for 3 years and loved it....i only broke one shaft and that was thrashing in the rock quarry at the badlands......if you are sprung under the spring perches line up believe it or not......at least they did on a yj we did last winter.....
ohio prices
8.8=150-200
mini spool=80
new calipers and rotors=50
misc.=100
new rearend for about 500 that can handle some pretty big tires.....i ran 36s and i have seen them hold 38s with no breakage.....to bad u didnt post this sooner we just yanked a set in favor of 60s and sold them with detroit lockers 4:10s for 700

catfish 12-05-2008 12:38 PM

Quote:

Originally Posted by whitebuffalo (Post 289151)
just to clarify what has already been said.

you can swap to a dana 44 out of an XJ (there was a narrow window here of rear 44s). that would be more or less a straight swap, but good luck finding one.

you could swap front and rear to whatever the hell you want, obviously this will cost more

you could swap to a ford 8.8 out of an explorer. this will require a little welding, but your factory wheels will work, you dont have to touch the front, they're fairly cheap (~$250) and plenty beefy.

what do you mean i don't have to touch the front, i have a d35 in rear with 3:07's and 3:07's in front, so your saying if i get the 8.8 i don't have to do anything to front?

flattietj 12-05-2008 12:42 PM

by saying that you wont have to touch it he means that you will have to regear it.....no fab work....just gears

flattietj 12-05-2008 12:44 PM

where in ky are you located?

catfish 12-05-2008 12:56 PM

western ky, around greenville area

flattietj 12-05-2008 01:02 PM

how far from cinci.....ive got a buddy that owns a jeep junkyard in that area tht can hook u up with 44s if you want though i think the 8.8 swap would be easier and cheaper

catfish 12-05-2008 01:05 PM

ok so if i go wit the 8.8 what do i do about the front end? i'm new to this stuff.

flattietj 12-05-2008 01:08 PM

just regear it to match......what tires r u gonna run.....u can get a 4:10 8.8 and regear the front to 4:10s and be fine up to even 35s.....you will be slightly under geared but be ok......or you can regear both to 4:88 with that being the lowest you can go on the d30......

catfish 12-05-2008 01:12 PM

The reason i'm gonna go to a 4:10 or lower is because i'm running 33"s on it now and top speed is about 60 to 65 mph, but the rear end went out and so i thought i would try to correct this top end speed problem and from what i have been told the lower gear would help with that. is this true?

flattietj 12-05-2008 01:16 PM

your top speed on your speedometer may not be correct due o the increase in tires size.....the lower gears will help with the power to go faster but they also fight you by making your engine spin at a higher rpm.....will this be a dd or just a toy.....im guessin since you wanna go 65 then you like to drive on the road....u should check your speed by radar or gps or something to see how fast you are actually goiong

catfish 12-05-2008 01:20 PM

yeah the tach is off i know, but it does only go about 60 to 65 with the 3:07's in it, was just wondering if the lower gears will fix this.

flattietj 12-05-2008 01:24 PM

do you run out of power....technically u should be able to go faster with a taller gear but it takes more power to get there

catfish 12-05-2008 01:27 PM

yeah when i hit a hill i loose 5th gear all together, i have a straight 6 in it. but just driving around up to 50 to 60 i have all kinds of power.

flattietj 12-05-2008 01:30 PM

4:10s would probably do it.......if you dd it i wouldnt consider much lower or you will tach out before you hit 65.....i run 5:13s and 39s and go 70 mph while my speedo says i go 55.......consult one of those charts in the magazines.....itll get you in the ballpark......if you get an 8.8 just make sure it is a 31spline disc brake set up......should be no more than 250

catfish 12-05-2008 01:35 PM

thank you so much, could i just find a d35 rear end with 4:10's or are they hard to find? and then just re gear the front to 4:10

flattietj 12-05-2008 01:39 PM

would be a wast of time really.......you would be setting ur self up for another busted rearend in the future especially if you ever wheel it.....i think it would be worth putting an 8.8 in there

catfish 12-05-2008 01:41 PM

so what do i do about the front end?

catfish 12-05-2008 01:43 PM

also what about the driveline using the 8.8?

whitebuffalo 12-05-2008 02:36 PM

Quote:

Originally Posted by flattietj (Post 289161)
by saying that you wont have to touch it he means that you will have to regear it.....no fab work....just gears

correct.

3.07s is pretty tall on 33s. 3.73 8.8s are a dime a dozen...you can find em with 4.10s too though. iirc i paid around 500 for gears and install kits on my axles......paid a buddy a couple hundred to set them up.

for the driveline, theres an adaptor that bolts up to the 8.8 pinion flange that adapts it to a 1310 ujoint. it was cheap....40 bux maybe?

Coyote_94YJ 12-05-2008 02:44 PM

Quote:

Originally Posted by whitebuffalo (Post 289202)
correct.

3.07s is pretty tall on 33s. 3.73 8.8s are a dime a dozen...you can find em with 4.10s too though. iirc i paid around 500 for gears and install kits on my axles......paid a buddy a couple hundred to set them up.

for the driveline, theres an adaptor that bolts up to the 8.8 pinion flange that adapts it to a 1310 ujoint. it was cheap....40 bux maybe?

Yes, 3.07 and 33's :(.......For a bit I ran 3.07 on 38's. Didn't hit 4th gear till 65-70mph. :(

Believe it or not when I picked up my 8.8 I asked for the flange off the driveline from the exploder and it fit right onto my existing driveline. :) No adapter just the ford oem flange for free with the 8.8.

catfish 12-05-2008 02:49 PM

Thank you all so much for walking me through this, i think i have a better understanding of this now, i think i can get a hold of a 8.8 fairly cheap with 4:10's in it already, and i found someone to do the mod for me, so until i get the 4:10 gears for the front i can just take out the front drive line (just to be on the safe side) and drive it like that can't i? i have a son that drives it sometimes so i don't want to leave the drive line in for him to brake something in the front.

Coyote_94YJ 12-05-2008 02:59 PM

Yes you can pull the front driveline and use it that way for a while. I did for about 3 months.

flattietj 12-05-2008 03:25 PM

maybe you can get somebody on here that is regearing to send you their old gears....u need reverse rotation 4:10s for the front end

Coyote_94YJ 12-05-2008 03:39 PM

Quote:

Originally Posted by flattietj (Post 289218)
maybe you can get somebody on here that is regearing to send you their old gears....u need reverse rotation 4:10s for the front end

He'll also need a carrier and install kit.

flattietj 12-05-2008 03:41 PM

details details......hes right...you need those too

flattietj 12-05-2008 03:47 PM

and while your in there you might as well get a disconnect eliminator and a tj long shaft to eliminate the constant problem


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