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Ford 8.8" to Dana 35 install differences??

5411 Views 25 Replies 2 Participants Last post by  H8monday
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Ford 8.8\" to Dana 35 install differences??

I am planning an 8.8" swap into my TJ and I have a couple concerns that I want verified. I am doing this swap 5 hours from my house and I will need to drive home. I just need to know about the things that I will need to do to get me home. First off I have a 2" lift, 31" tires, manual tranny, and I do not have a SYE kit yet. I have been told that the brake lines are different and that I will have to rig that up. Not a big deal. I have been told that the ujoints are the same and that I need to make sure that I have the yoke plate from the end of the explorer dshaft since it bolts to a flat plate on the pinion of the 8.8". Will my driveshaft be ok for street use lengthwise until I get a SYE kit and new shaft or will it need shortened? How much longer is the 8.8" than the d35? I guess what I mean is how much more does the pinion stick forward? Should I get the new upper cam bolts just in case there are vibes? I guess I can figure out the ebrake when I get home. My gears front and rear will be different until I swap the front R&P out so should I remove the front driveshaft or will it be fine as long as I keep it out of 4wd. Any other things I am overlooking?
Thanks,
Aaron
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Re: Ford 8.8\" to Dana 35 install differences??

I had my drive shaft shortened by about 1 1/2" when I swapped to the 8.8 I think I would go with a 2" crop if I did it again. I didnt listen to the expert advice from my drive line expert, thought it would be to short with all of the rear travel. but anywhere between about 1 1/2 and 2" will probably be where youll settle. You will be able to drive home with the stock shaft, provided you have the bolt on yoke. Its a very tough yoke set up, i broke a main leaf spring on a steep hill last night and it caused the axle to wrap so badly that it binded the drive shaft and pinion yoke and shattered one of the bearing cases in the pinion yoke on an almost new spicer U joint, no dammage to the yoke though, I guarentee that same incident would have destroyed the D35s weak yoke,( I used to have carry at least 2 spare D35 yokes). I cant remember what post i saw it on but someone had mentioned that the 8.8 gives up 1. 75 inches of clearance to the D35, I carefully measured before the swap and immediately after, with no other mods performed but the swap and I lost only 1" of ground clearance.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.
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Re: Ford 8.8\" to Dana 35 install differences??

Arron,
If you can, measure your maximum clearance at the low point of the differntial before and after the install. Id like to see your results. The E brake is very easy to hook up, the brake lines arent really hard either, they just arent an over the counter configuration. If you are the only person with access to your Jeep you will probably be Ok to keep the front drive line hooked up(provided you trust yourself not to pull abone head move and shift into 4WD). If there are any concernes that it may be able to be accidentally shifted into 4 WD(your fault,somebody elses fault,nobodys fault) I would disconnect. My freinds son borrowed(without permission) his YJ in between front and rear gear changes, and totaly destroyed the NP 231(busted case, etc) when he through it 4 WD and climbed a sand dune( I had figured the slip provided by sand would have been more forgiving) but then again that what his teenagers version of what happened. One other thing you need to do to the 8.8 diff. If you are planning any moderately tough rock trails, you need to get under the diff with a grinder and grind off the edges of the lower portion of the diff cover. The rolled edge of the cover hangs down about 1/4 inch below the housing and is a rock magnet. Once ground flush with the housing there is nothing to catch. Attached is a picture of the diff after a day in the rocks, and I spaced out and didnt grind the cover,(spent a couple hours sanding and paiting it but didnt grind it flush, great priorities).

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.

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Re: Ford 8.8\" to Dana 35 install differences??

Thanks for the great info. Yeah I will measure the clearance for you. I have also read somewhere that the 8.8 with discs from an Exploder has semi floating axles. Is that true or are they C clippers like the other 8.8s?
Aaron
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Re: Ford 8.8\" to Dana 35 install differences??

You need to be certain that your drive shaft will fit BEFORE you start swapping axles. If it is too long, and you can't reinstall it, you are 5 hrs from home on foot unless you can get it cut while you are doing the rest of the install.
Second. The front axle. The TJ front axle is is gear all the time - the axle, not the transfer case. Get some good info on whether anything will happen to the transfer case even if the transfer case is out of gear for the front axle. I don't know, but would sure find out before I put different gears in each axle. Might not be a problem, but the TJ axle does not disconnect like a YJ axle.

Doug '97 TJ
Creator of the CBrack
CBrack.com
Re: Ford 8.8\" to Dana 35 install differences??

Arron,
I hadnt considered the difference in axles between the YJ and TJ.
Doug,
I appreciate you ponting that out, I would certainly hate to give bad advice and ruin another mans Jeep. Ill admit Im hard on parts, but I usually have to be in the driver seat to ruin something. Also as Doug mentioned, check how much compresion distance you have available at the rear drive shaft slip yoke. Check it while on aflat surface, if you have 2" of slip remaining you will be OK for driveability home from your install. If you cant find any reassuring advice to the contrary you should play it safe and disconnect the front drive shaft.
Thanks again Doug, for your wise foresight.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.
Re: Ford 8.8\" to Dana 35 install differences??

Arron,
In response to your C clip question.
The 95s and newer with the disc brakes, still have the C clip axles. However the axle shafts are held in place by an outer axle tube flange, which in turn the disc brake backing plate is bolted up to, using (4) 3/8 bolts. This is a semi floating system which affectively relieves the latteral stress loads on the axle bearings and C clip. If the C clip, or axle shaft was to fail the wheel hub will still be securely held in place.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.
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Re: Ford 8.8\" to Dana 35 install differences??

That's cool. Would you be able to drive home on that setup with a broken c-clip or axle?
Aaron
Re: Ford 8.8\" to Dana 35 install differences??

Yes, it would get you home without a problem, provided you took it easy. The attachment looks pretty stout. The other good factor is that with the absence of latteral loads being placed on the C clip it should not ever break. And with the 31 spline 1.65" axles, they should be very reliable, if you were to go to High Strength Alloy Moser axle shafts you would be hard pressed to bust a shaft.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.
G
Re: Ford 8.8\" to Dana 35 install differences??

I doubt I will break an axle but I still want to carry spares. Are those axles equal length or will I need to carry two spares.
Thanks,
Aaron
Re: Ford 8.8\" to Dana 35 install differences??

are you going to try to re-use the dana 35 coil brackets and track arm brackets, or are you going to buy new ones? the new ones are $300 from rubicon express, and they really look like a PITA to weld on.. remember to be VERY carefull welding on the axle tubes, they are easy to warp

~~Elusive~~
it's sort of still a cj thingy....
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Re: Ford 8.8\" to Dana 35 install differences??

I won't be welding anything. I am too stoopid for that. I am hiring a non-moron to do it. I built a tire carrier bumper and it took 3 months to complete. It worked fine until the latch broke and it came open taking out 2 mailboxes. It would take me a year to get this right. I will be supplying the RE brackets. I really want my present rearend in one piece just in case.
Aaron
Re: Ford 8.8\" to Dana 35 install differences??

you can also send RE your axle and they'll weld the brackets on... seems like the best idea to me...

~~Elusive~~
it's sort of still a cj thingy....
Re: Ford 8.8\" to Dana 35 install differences??

Freak,
I took pictures of different compnonents today, so I have been trying to get them out to everyone who had asked. And build a project schedule, and budget for work at the same time. Well here are the pictures of the E brake set up for your conversion, I need to build better bracketry, but you can see how simple it is using existing brackets.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.

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Re: Ford 8.8\" to Dana 35 install differences??

Freak,
Your gonna love your 8.8 swap, Look at that yoke set up, youll have to work hard to break that Yoke. Before you say anything, I know the pinion angle is all screwed up. I broke a main leaf spring friday night and Im using a set I put together from a few old sets I had in my storage, so I could go wheelin yesterday. They worked for the day but are pretty tweaked now. On Friday night when the leaf failed, The pinion rotated upward to a critical point where the Yokes bound up, and they grenaded a new spicer U joint, no damage at all to the yoke though. New spring packs being made this week.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.

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Re: Ford 8.8\" to Dana 35 install differences??

Was your ebrake bracket in the middle of the Jeep bolted to the floorboard originally? I have never looked at that on a YJ before. Mine is in the middle above the rear driveshaft. Also..what size tires are those you are running? They look like 35" swampers maybe. Are you using a CV driveshaft? YJs seem so much less complicated. I wish I had a TJ body on a YJ chassis. People with YJs are chagning to coils and people with TJs are changing to leafs. Go figure. I would have had a rear end in my TJ a long time ago if it weren't for the coils.
Aaron
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Re: Ford 8.8\" to Dana 35 install differences??

How did this upgrade go? Pictures? Tips? Things go wrong?

tnx,

- Dan

99 4Runner (wifes grocery getter)
88 Bronco * FOR SALE *
Looking for a new trail rig...
G
Re: Ford 8.8\" to Dana 35 install differences??

I decided to go 9". I am not finished but I am collecting the parts.
Aaron
Re: Ford 8.8\" to Dana 35 install differences??

It was a piece of cake swap, took about 6 hours after the gears and detroit were in. That included fabricating a new shock set up to allow for the use of 33" long R9000s. the only thing that is weird with the swap is that diff housing is about an inch off center towards the passenger side, it has been no problem though. The disc brakes a great bonus in the swap. Ive had no problems to date, Ive had it out on some pretty tough short runs,everything seems solid. Ive posted some pictures on attachments in some of the earlier posts, here is one more of the shock set up.

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.

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Re: Ford 8.8\" to Dana 35 install differences??

Heres another shot from the rear

Jeff
89 Wrangler
If at first you dont succeed, your replacement will try and try again.

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