78' transmission problems (Full Version)

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78' transmission problems

  

wojnar48 -> 78' transmission problems (4/14/2008 4:06:12 PM)

Fellow Corvettesmen,
I have a original automatic 4-speed in my 78'. The shifting from 3rd to 4th the car buckles. (only in the process of shifting)
All other gears work like cream. What could be the problem? What would be the best action? A rebuild kit perhaps?
(I tried finding one on the web without seccess.

With Respect:Richard

  
78buckshot -> RE: 78' transmission problems (4/14/2008 6:20:13 PM)

Welcome to the site Wojnar48, the 1978 Vette factory automatic trans is a three speed turbohydramatic 350. If yours has a four speed automatic then it was converted at some point. If you can describe the problem with more detail we'll try to give you some diagnosis.

wojnar48 -> RE: 78' transmission problems (4/16/2008 3:33:28 PM)

I am sorry 78buckshot, I don't know why I wrote that its a 4 speed. Indeed it is a 3 speed original. I apologize. Well
all the other gear jump in smoothly but the shift from 2 to 3 is accompanied by a sligt crunching sound. As if the gear didnt want to shift. When heading down a hill, with less rpm the crunch is not there. The car also jolts . Thats about as best I can describe it.

78buckshot -> RE: 78' transmission problems (4/16/2008 6:08:25 PM)

I would put the car on a hoist and check all of the universal joints first. Our Vette's have six u-joints, two each on the drive-shaft and half-shafts. Also check the mounts for the transmission and differential. If you don't find any sloppy u-joints or mounts then have the transmission diagnosed by someone you trust, it may be time for a tranny rebuild but you want to eliminate the rest of the drive-line first.

  

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