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Ralph thanks for all the information. A lot more than I expected and very much appreciated. I'll give Butch a call.

Thanks again ;)

Phil

427 Roadster, #4279436
Southern Automotive FE...

Thanks Ralph - here's what is on the metal tag:

MCGS 6013 (???)
R 3.31 (3.31 ratio, don't know what the R stands for)
PL (I assume power lock)

Sounds like it's time for a gear oil change...

And the Auburn unit?

Phil

427 Roadster, #4279436
Southern Automotive FE
3:31 and Toploader

Roseville (N.Cal)

Maybe someone can enlighten me..... I did experience an occasional "clunk", mainly in the left (driver side) rear at low speed making a right turn initially. I have the Power-Lock upgrade with my...