CY & CX 400THM: differences & similarities

[@wot]

Forgot to ask if anyone has a source for speedometer drive gears for TH 400?


Thanks

[Mr70]

I have compiled a list of speedometer gears.
What specifically are you wanting to know?
Color-Ratio-Part#?

Look for a CON VIN possibly stamped around the bell housing as well as into a recessed machined pad located were the Trans. oil pan meetes the trans. valve body.
It's behind the shift linkage rubber boot.
It is parallel to the head pipe,so you will have to look behind the head pipe,and wipe the pad clean to notice.

[@wot]

Mr70,

Thanks for the reply. I need the stock replacement gear for a TH400 with 3:55gears. Someone had changed it when they changed the tire size.

[Mr70]

Gear Part #9780470,Gray in color with 44 teeth used on 3:55 ratio with F70X14,G70X14 tires on 1968 Chevelle-Elco-Camaro.

[WILMASBOYL78]

What are the shift points on the L78 th400 trans setup under full throttle application? If you just start out in "drive" and floor it, at what rpm will it shift fron 1-2 and then 2-3?? Trying to dial in the trans in one of my cars with th400 and 4.10 rear.

wilma

[WILMASBOYL78]

Any th400 experts have some feedback???

thanks, wilma

[Mr70]

I want to say my L-78 TH400 Chevelle fitted w/4:10/F70X14 shifts from:
1-2 @ 10-15MPH.
2-3 @ 18-25MPH.
I can double check the RPM for you this week..

I see a 70 Nova L-78 w/3:55/E70X14 shifts from:
1-2 @ 7-12 MPH.
2-3 @ 18-35 MPH.

[Chevy454]

Wilma...look at the chart at the beginning of the thread, and grab the numbers for the governor parts...see if ya can't still get those parts (maybe even from GM)...if you can, problem solved...

[Mr70]

The 1970 L-78 CW TH400 trans. used Governor #8626866.

[rangelec]

I just found a CW turbo 400 trans with a 6 bolt converter-supposed to be out of a 70 Z28. How much are these going for? The guy wants a grand for it-is that out of line???