C2 66 Differential Cover question

[Brian K.]

Is the 66 Corvette rear differential cover dated? Also is the cast part number 3871375? Mine is a March built car, the one on my car was replaced and need to find an original. Thanks sincerely Brian

[Joe L.]

Re: C2 66 Differential Cover question

Brian-----

3871375 was the casting number used for the cover for all 1965-77 Corvettes. I believe these covers were dated. I am certain that later examples (68-77) were dated and I'm virtually certain that 65-67 were, too.

[Brian K.]

Re: C2 66 Differential Cover question

Thanks Joe, I'll start my search now

[Gary B.]

66 Differential Cover question; some not dated

Brian,

The orginal differential cover on my July '66 build date car is NOT dated.

Gary

[John H.]

Re: 66 Differential Cover question; some not dated

My May '67-assembled cover isn't dated either.

[Rob A.]

Re: C2 66 Differential Cover question

My June '66 assembled small block cover is stamped AO 6 7 66...thought they all were dated and coded..guess not.

[John S.]

Re: C2 66 Differential Cover question

Rob,

This looks like an assembly date for your differential: 3.70:1 positraction rear assembled on June 7, 1966. Please check the "cover" to see if there are any date codes.

[Gary B.]

Diff. Cover vs. Diff. housing

Rob,

John is correct. The code you listed is what is stamped into the bottom flange of the differential housing. That stamping is not on the flange of the differential cover.

Gary

[Rob A.]

Re: Diff. Cover vs. Diff. housing

Gary,

Sorry, my mistake, as you say this data is stamped on the housing flange.