[daveh]

Hey guys,

About a year ago I purchased a 70 Monte Carlo it needs to be restored but still runs. It is a 350 auto car with a turbo 400 and a 12 bolt. The engine runs great it just when I go to put it in gear it will "klunk" it will "klunk" really hard when I put it in reverse. Can anyone point me into the right direction as to why it does this? What do you think it is?

Thanks Dave

[gator412]

Sounds like bad u-joints to me.....buts lets see what the experts have to say.

[STRKD89FB]

U-joints are the first thing that come to mind for me also.

[eldee]

When I first got my '55, it did the same thing. I replaced u-joints, then tail shaft bushing, then finally rebuilt the rear end. Still had clunking! Turns out it was wore out (gone!) leaf spring bushings. Just an idea, you might look at before you go through all the steps I did.

[jimfulco]

I've seen a few cars from that period that had a lot of drive train slack, even when brand new. The Chevy dealer told me mine was "perfectly normal". I figured it was BS, but it lasted a long time and never made any noise, other than the clunk.

[Augusto]

TH400's have a locating dovel under the valve body, if it is worn it will clunk hard, you should have your tranny serviced inmediatelly.

Augusto.