Q-Trac or Tranny

[GRAT]

Help,


I have had all you joints replaced on both driveshafts. If I am driving between 40 and 50 MPH I get a thunking sound from underneath. The sound sometime continues upon stopping, the sound always disappears when I out her in neutral. How can I tell if it is the tranny/ flexplate of the QT unit ?

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79 Chero WT/ TH400 /QT /360 /3" Dynomax / K&N

[RudyC]

OK thats a tuff one. Try driving with the floor panel off with a buddy who can drive while you look for the mystery noises.

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1979 WAGONEER, 360, TH400, Q- TRAC. 3" ADD A LEAFS, 31" MUD T/A'S (PEP BOYS CLONES).
" Go farther, it only breaks on the street"

[Ralphp]

I may be mistaken, but if this noise is occurring at times when you are actually stopped, it should be something other than the T-Case, since there would be nothing moving inside while the vehicle is stopped.

[GRAT]

Thanks Ralph,

It does occur sometimes right after the car has stopped, I then go to neutral and the noice stops.


Could it be end play in the crankshaft, or a bad Harmonic Balancer ?

Does anyone know how to check for a bad balancer ?

Thanks again all