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Discussion Starter #1
Can anyone tell me the normal In gear rotation on a c-4 transmission. I am getting serious clunking when my TCI street rodder transmission is used in automatic mode. Rear end has no slack and driveshaft is fine. If it put the transmission in gear with the driveshaft removed the rear shaft seems to rotate excessively
 

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Rotate excessively? It’s geared. I can’t think of a reason it would rotate too fast if that is what you mean.
If your transmission has a 2.46 1st gear, and you are idling at say 800 rpm, it should be spinning about 2000 rpm
 

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You've got that backward. In lower gears, the input shaft is turning faster than the output shaft. 800 RPM idle equals 325 RPM at the output in first gear minus some slippage in the torque converter.
 

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You've got that backward. In lower gears, the input shaft is turning faster than the output shaft. 800 RPM idle equals 325 RPM at the output in first gear minus some slippage in the torque converter.
 

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Discussion Starter #5
To explain this better because I didn’t do a very good job the first time.

I put my car on a lift and disconnected the driveshaft. With this TCI C-4 transmission in park I can rotate the tailshaft about 10 degrees in either direction and it seems very excessive to me. I am getting loud clunking noise when it shifts. Any thoughts on this

Thanks in advance
Jack
 

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You've got that backward. In lower gears, the input shaft is turning faster than the output shaft. 800 RPM idle equals 325 RPM at the output in first gear minus some slippage in the torque converter.
Lol, duh. Yeah you’re right.
 

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in park there is a pawl that engages a slot on the output shaft. if there is excess movement the pawl or shaft are worn
 

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Junk TCI trans built with scrap parts.

I’ve seen it more than once.
I have to agree but hope he has been lucky. I've had to fix a few TCI C6's , not impressive at all.
Not surprised on the shifts , Rare to come across a good one of their valvebodies . They usually come standard with a 2-3 flare
 
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