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th400 died on me today. help?


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ajvcutlass
New User

Aug 20, 2012, 6:14 AM

Post #1 of 3 (1796 views)
th400 died on me today. help? Sign In

Started up my 71 cutlass supreme 455 rocket and a th400 tranny and b&m shift kit. threw it into first and heard grinding put it back into park shut it off then started it again engine purrs like a champ but the gears no longer work and im a sittin duck. previously to this it has been perfect no slippage or anything. yes checked the fluids all is good. my buddy had a manual once and the gears werent working but that was cause his transfer case was bumped into nuetral and we just replaced the shifter sheet and all is well. confused any ideas?


nickwarner
Veteran / Moderator
nickwarner profile image

Aug 20, 2012, 4:21 PM

Post #2 of 3 (1714 views)
Re: th400 died on me today. help? Sign In

When you put it in gear does it drop the RPMs any like it normally does when you go to drive or reverse? Is the driveshaft still hooked up? Jack it up from the rear and put it in gear. Does the driveshaft turn? You might be looking at a broken axleshaft or grenaded spider gears in the diff and it wouldn't be a trans problem. Or you may have broken the planetary gears inside your trans. Do those tests to narrow it down to a trans problem or a rear end problem and we can go from there.


ajvcutlass
New User

Aug 22, 2012, 6:12 AM

Post #3 of 3 (1665 views)
Re: th400 died on me today. help? Sign In

ok jacking it up today and ill let ya know! thanks so much for the reply and rpms stay the same no drop. get back to ya when i look over what u suggested






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