T56 transmission please help!!!

**Z-Man** · 05-01-2010, 04:21 PM

I have had my transmission at the shop for a week, and keep getting excuses on why its not together yet. I stopped by today and he told me that fourth gear had some chipped teeth. I saw it and it did. He told me I had to replace the input shaft because the 4th gear is made onto the shaft. Is this true or is he just wanting more money? Please let me know b/c i've already got bout a grand in parts, and I'm getting pissed at him, when he told me that it would take 2 days to have my tranny done.

**Cutlass** · 05-01-2010, 05:42 PM

Originally Posted by Z-Man

He told me I had to replace the input shaft because the 4th gear is made onto the shaft. Is this true or is he just wanting more money?

Yes it is essentially true. There isn't an actual 4th gear. 4th gear is accomplished by locking the input shaft to the output shaft through a synchro. Its a 1:1 ratio and there isn't an actual gear to gear mesh to accomplish that.
The actual gear on the input shaft is just there to drive the counter shaft I believe.

**Wesman** · 05-04-2010, 09:49 AM

Originally Posted by Cutlass

Yes it is essentially true. There isn't an actual 4th gear. 4th gear is accomplished by locking the input shaft to the output shaft through a synchro. Its a 1:1 ratio and there isn't an actual gear to gear mesh to accomplish that.
The actual gear on the input shaft is just there to drive the counter shaft I believe.

Agreed.

Chipped teeth on 4th gear (not common) require replacement of the input shaft. The synchro engages the input shaft to the output shaft, while the actual helical gear just drives the countershaft in order to send power to the other gears in the trans.