[boecmf]

Just when I was sure I had a real L78 someone told me that you couldn't get 3.73 rear end stock from the factory with the Turbo 400 transmission. Is this true?

 

[Mike]

What's the code on the rear housing ?
CI is for 3.73 posi w/L78/396.

 

[boecmf]

What's the code on the rear housing ?
CI is for 3.73 posi w/L78/396.

Yes. CI0421B

 

[Mike]

OK,that's a 3.73 posi.
Don't see anything that says you couldn't order a 3.73 posi w/TH400.

 

[boecmf]

OK,that's a 3.73 posi.
Don't see anything that says you couldn't order a 3.73 posi w/TH400.

Does it make any difference if it is a L78? I've seen, what I believe to be real, L78's with manual transmissions with the 3.73 rear but not any automatics?

 

[Don_Lightfoot]

For 1969 the L78 engine came standard with 3.55 ratio, regardless of transmission. Here were the options, also regardless of transmission:

Economy - 3.31.
Performance - 3.73.
Special Order - 4.10.

Dealer Installed - 4.56 and 4.88.

Hope this helps.

 

[boecmf]

For 1969 the L78 engine came standard with 3.55 ratio, regardless of transmission. Here were the options, also regardless of transmission:

Economy - 3.31.
Performance - 3.73.
Special Order - 4.10.

Dealer Installed - 4.56 and 4.88.

Hope this helps.

Helps very much!!! Thanks!!! One more question, On my POP it says "C"9DO3 for the transmission. The "C" is for Powerglide--as far as I know that wasn't an option for the L78 but I have seen other errors like this on POP's. Has anyone else? The POP doesn't appear to be a fake and I know that there are very good fakes out there. Shouldn't it be an "X"?

 

[Mike]

Think C was used for all a/t as I don't see a code showing TH400 for the POP -69-72.
The engine code specified the trans along with the engine.
Check with Dale on that.

 

[boecmf]

Think C was used for all a/t as I don't see a code showing TH400 for the POP -69-72.
The engine code specified the trans along with the engine.
Check with Dale on that.

The engine code on the POP is T0409KF as you know is 396 375 11.0:01 4BC TH trans. I'm starting to feel a lot better about this but I have been afraid to ask. I'd like to hear from Dale or anyone else. Thanks!

 

[Mike]

PM Dale.

 

[boecmf]

PM Dale.

DaleM...right?

 

[Mike]

Yes.