Putt Putt Putt over 40 MPH and Coasting- 5r55e

[Kean_SHO]

I wasn't sure where to start searching for this one. I recently had several tranny issues. After several attempts at trying to solve the problem ( VB rebuld, TSB fixes in place) i decided just to have the tranny rebuilt.
After about 2 months, and several thousand miles i hear a Pop Pop Pop noise coming from the middle of the truck when coasting over 40 MPH. I think i can feel it rap as well, but it might just be my imagination. Below 40 it goes away. If i keep my foot on the throttle, but allow the truck to slow down I do not hear the noise.
I don't know if the shop that did the rebuild used my VB. The rebult tranny does have a warranty but I would have to remove it from the truck to exercise the warranty as that is the way i brought it to them.
Im kind of at a loss for where to search on this. Does this problem sound familiar to anyone?
97XLT 4x4, 5R55E.

 

[gijoecam]

Sounds like the beginnings of a failing transfer case... of course, it could simply be a diff bearing on its way out, or a bad u-joint too... All three issues start out just as you described... It's tough to ferret out which one it is at this point... Sorry.

-Joe

 

[Kean_SHO]

thanks for the info!
i would say any of those are very likely in my case. i have a little slop in the u-joints on the front driveshaft for sure... but would also suspect the transfer case. as the truck has aged, ive noticed that it makes a little more noise than it used to and i think it has the usuall symptoms of a broken fork. its on my list of things to fix, but im finding it harder and harder to justify another 1K for a tc rebuild (thats what the shop quoted me).
If i do, ill update this thread to tell you what i find.

 

[Kean_SHO]

an update for this old thread... I ended up replacing the TC with a reman'ed one. Everything is working and shifting well again.

 

[Wrench]

Kean_SHO - please say transfercase instead of TC so as not to confuse others with the Torque converter. tks.