88' 5.0 Thumping Driveline? Aod?

[Old88Vert]

I'm having a tough time figuring this out. It started out where I could barley notice it (a slight bump/thump) while driving 20-35mph coasting in traffic. A couple of weeks ago I was hauling A and all of a sudden there was traffic and I had lock em up. The next time I drove it and ever since (5-6wks) its been thumping (trans/rear). I replaced all the bearings in the differential (chipped tooth on the pinion) and the gears 3.73 with new axle bearings but the thump is still there? Looking for advise.

 

[RaggedGT]

Best suggestion I have,is put the car up on jack stands-all 4 wheels off the ground and inspect all the mounts,bushings,end links,u joints,etc. If you don't see anything worn/broken or damaged-start it up and put it in gear (with all 4 wheels off the ground,securely on stands/lift.) and watch the drive line for shimmying/thumping.
Also-Welcome to Stangnet

 

[90sickfox]

Have you replaced the u joints on the driveshaft ?

 

[Old88Vert]

the rear joint but not the front. I need to replace just to make sure. Thanks.

 

[Old88Vert]

Thanks for the welcome. I did all that you suggested this week with nothing more able and the thump was not appearent on the stands In gear. Feels like a bearing but the occurrence seems faster than a wheel rotation as well.

 

[MFE92]

Trans mount still intact?

 

[General karthief]

I'm going with trans or motor mount or u joint

 

[Old88Vert]

Sorry for not reporting back. All mounts replaced prior to this entry. Still thumping, I purchased a 5spd. conversion and I believe the AOD is the issue. I will repost once I've swapped it out.

 

[nelzfoxes]

Sorry for not reporting back. All mounts replaced prior to this entry. Still thumping, I purchased a 5spd. conversion and I believe the AOD is the issue. I will repost once I've swapped it out.

Now that’s how you fix a car! My 302 was burning a lot of oil so I put a 351 in it! Ahaha! You and I are kindred spirits my friend!

 

[Old88Vert]

Yeah buddy, I don't just want the fix I want it exponentially better!! 351 is my kind of fix as well.