TH400 tailshaft runout spec?
Thread Starter
C6 the C5 of tomorrow
Joined: Nov 2000
Posts: 6,665
Likes: 2
From: Twin Cities Minnesota
TH400 tailshaft runout spec?
I've been chasin a really anoying vibration in my Vette ever since I had the transmission / Engine rebuilt.
Last night I was under the car and I wiggled on the diff's Pinion and the trasmissions tail shaft. The pinion was tighter than, well really tight. The transmission had about .010 to .020" slop. It seemed like enough to cause the vibration.
So How tight SHOULD the tail shaft be ?
Last night I was under the car and I wiggled on the diff's Pinion and the trasmissions tail shaft. The pinion was tighter than, well really tight. The transmission had about .010 to .020" slop. It seemed like enough to cause the vibration.
So How tight SHOULD the tail shaft be ?
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: TH400 tailshaft runout spec? (427V8)
I don't know what the specs should be but they do wiggle when you grap the universal and try moving it. I have seen this alot and it doesn't seem to cause a vibration
Burning Brakes
Joined: Nov 2000
Posts: 948
Likes: 0
From: Johnston Iowa
Re: TH400 tailshaft runout spec? (427V8)
I had a problem like this in my 68 RS Camaro with a Turbo 400.
I took off the tail shaft and took it to a local tranny shop.
They pressed in a new brass bushing inside the tailshaft as well as a new rear seal and gave me a new case gasket for under $10.00.
This seemed to tighten it up a little more and the vibration that I had went away.
I also replaced the u-joints so I don't know if the entire problem was realted to the bushing.
I took off the tail shaft and took it to a local tranny shop.
They pressed in a new brass bushing inside the tailshaft as well as a new rear seal and gave me a new case gasket for under $10.00.
This seemed to tighten it up a little more and the vibration that I had went away.
I also replaced the u-joints so I don't know if the entire problem was realted to the bushing.
