I just drained out the original lube in my 73's diff. & I figured while I'm at it I'll do the 4spd trans also, is the lube weight the same as the Differential ? , I used 80w 90w with CRC posi additive, the rear is a 3:36 I believe. The power train and engine just turned 30K miles two years ago.

Thanks for any feed back ,,,,,, New member & older Vette owner

Glenn

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Well I guess nobody knows, so I'll check with a dealership.