Ok so about a month ago I got rid if my busted D35 for a junk yard 8.25 29 spline. It ran well and gave me no problems. Now I'm am starting to notice that when I am between 40-45 MPH, and let off the gas, I hear a crunching sound coming from the rear. It only lasts a fraction of a second and then it's fine. Note that this only happens if I let off between 40-45 MPH. If I'm cruising at 55 and let off, I hear nothing as I slow down. Anyone have any clue what it could be? I did nothing to the axle. I pulled it out of a jeep in a junk yard and through it under mine. Never messed with the diff. Thanks.

 

I say get a D44 from a cherokee and swap that in The only thing i can think of is it must have had a problem before but it just started to get worse. Maybe theres a little play in the diff. It probably wasn't run for a while. Check the gear oil in there too.

 

Ok, I'll change out the fluid on Saturday. While I'm in there I'll take a look at everything.

 

My Dana 35 does the same thing at 25mph. I've got 310k miles on it. I greased the axle bearings with no change. I'm guessing the diff or pinion bearings or the stock limited slip diff is worn.

 

Ok, how long has that been going on?

 

My D35 always makes a thud noise whenever I hit the gas, I figured its just old and does that because of the posi. On a hill from a stop i can really notice it, but theres no crunching in it. Just a thud. Everything thuds on that old 89.

 

this sounds like a driveshaft u-joint...could be a few things though.

ya, dynamite id say open it up and have a look around...dont know what else to tell you

 

Alright thanks everyone, I'm pretty much booked solid this week with school and work, but I'll let ya know on Saturday what I find waiting for me in their.

 

I checked my driveshaft, its solid. Doesn't move at all no matter where I push or pull it. I think the thud is just how it is. As for crunching, the u joints might be the case.