Rear Differential,

[Jeep Sarge]

I Bought me a little 2wd Commanche as a project and i got everything running good and cleaned up and i went for a little afternoon drive and i have a terrible Vibration whenever i lift my foot off the Gas pedal at speeds over 25-30. Well I am thinking that i have got some issues in the rearend, i had previously changed out the rear diff fluid and hadn't seen any signs of wear, so i am thinking that it is some backlash or something, as soon as i get back on the gas goes right away.

 

Well with all that being said i am new to the MJ/XJ world and i got a buddy that has a Dana 35 out of a 1993YJ and was wondering if it would bolt right in or do i need to stick with a MJ/XJ rear?

 

 

Thanks in advance, JEEP SARGE

[Wildman]

Did you check the U-joints???

 

That is normal check, when you hit about 30 mph and let off the gas, the U-joint will give you a clunk or really bad vibration.

[Jeep Sarge]

I looked at them and didn't really feel any play in them, but i guess that i can throw some new ones in there just to rule it out, i was gonna put new ones in there anyway when i swapped Diffs :cheers:

[mvusse]

It does sound like a u joint. Remove the drive shaft and play with the u joints to make sure all 4 caps rotate smoothly. I'm willing to bet one of them is bad. And I'm guessing it's the rear one.

[Jeep Sarge]

I'll try it and See, hope that your right :doh:

[Jeep Sarge]

U-Joints Dry as a Bone, we'll see tomorrow when i go out for a ride

[Squeegy410]

to answer the intial question I would think the D35 would bolt right up. I think (correct me if i'm wrong, i'm new to this too) all MJ's came with either a D35 or D44.

[mvusse]

But are YJ springs spaced the same distance apart as MJ springs?

 

The perches on a YJ D35 might not be in the correct location.

[Squeegy410]

oh I didn't even think about that. I doubt it will just bolt right up come to think of it. I know most things xj related match in the front of an mj but not the back. It's probobly the same for the tj. But i do have a very limited knowledge so far lol. I'm learning :D

[jimoshel]

MJ'S came with D30 and D35. Only the metric ton package or special order got thr D44. The yJ spring perches are 1-1/2 inches farther apart than MJ.

[Squeegy410]

gotchya. I'll make a note of that so maybe i can actually be helpfull for a change one day lol

[Jeep Sarge]

MJ'S came with D30 and D35. Only the metric ton package or special order got thr D44. The yJ spring perches are 1-1/2 inches farther apart than MJ.

 

 

Thanks that is what i was needing to know, Let me see how replacing my u-joints works out this evening

[jpnjim]

Don't forget the 3rd MJ rear axle (before they started spec'ing D44's). :yes:

 

 

'86 4.10 geared 1 piece axleshaft AMC Model 20's. :smart:

[DJM/78]

IMHO , after all the work putting a new or used diff , in place , I would find a ford 8.8 or a dana 44 . Both are good

axles and very upgradable . Disc brakes and lots of options on lockers . :cheers:

[Squeegy410]

IMHO , after all the work putting a new or used diff , in place , I would find a ford 8.8 or a dana 44 . Both are good

axles and very upgradable . Disc brakes and lots of options on lockers . :cheers:

 

Do you mean disk brakes are an option? because my D44 rear axle has drum brakes...

[Pete M]

later years of the Explorer 8.8 has disk brakes, and the Jeep Dana 44 can be upgraded to disks fairly easily.

[Jeep Sarge]

U-Joints fixed it right up, it is usually the simple stuff, Thanks Guys

[Wildman]

Yep........another K.I.S.S. project :cheers: