fsc66

Trying to figure out what it would have cost back in 1966 to have a rear end replaced by the dealership. 1966 Corvette, owner wanted the 3.36 posi exchanged for a 4.11 posi. Entire rear end exchange not just gears. The 1966 Flat rate labor manual calls for 3 hours to do the replacement. Problem is trying to figure out if there was a complete rear end available as an exchange or replacement or if I am going to have to find all the part #'s and part prices in 1966 to figure this one out.

Thanks,

Paul

Avispa

FWIW, to my knowledge there wasn't an entire replacement differential assembly available as a service part (unlike a crate engine) in 1974 when I worked at a dealer's service department. The flat rate R&R time figure was given in case it was necessary to pull the differential assembly for further repair (the R&R time was added to the time for the other repairs) or to service other parts of the car.

Godholio

Would they just swap out the gears and leave the original housing?

MikeM

I looked in a '69 parts book this AM. Didn't see any complete differentials. That's not to say one couldn't have been special ordered.

Just roughly adding it up in my head, the list price on the individual parts would have been $500 or more to assemble a differential from individual parts. Plus the labor to R&R the differential. I doubt many followed that route.

It was common to just replace the ring/pinion gears and even use the ring gear spacer if you didn't have the right case.

My question. Why is this a question of what happened back then?

fsc66

Helping someone research his vehicle. Car date, engine numbers, trans all perfect numbers plus dates in addition to having the partial Vin on both 427 and M21 trans. Got to the rear and it's coded as a 4.11 but dated also right where it should be. the 4.11 was not available with the L36 yet it is dated correctly. So how does this rear end up in this car and what would it have cost to have it installed by the dealer? Understand, can't be sure it was done at dealer but info he has leads us to believe it was.
Engine is an "IL" block, rear end is coded: "FB". I am guessing it originally came with a 3.36 posi.

Paul

Powershift

With the right connections or $$ just about anything was possible during this time. It may have been a "special customer request". Also possible it came from a salvaged 427 SHP car.

Larry

EDIT: How does the differential build date correspond to the build date of the car?? If I remember correctly many cars had a differential build date about 1-2 weeks prior to the car build. Not a lot of rear differential inventory at the St Louis factory.

Boyan

You want to know how the 4.11 ended up in your friends car? The original owner had a buddy who wanted to switch with a similar car. They swapped in the driveway one weekend in 66 over a couple beers.
Boyan

Powershift

I've done that a few times………………..needed to finish up by Sunday evening so that car could be driven to work Monday morning.

This held true "rain or shine"

PS: That is why we limited the ice cooler capacity.

Larry

fsc66

Car is a C1 build date, looks like Nov 2, 1965 based on serial number: Rear end is an FB 10 25 65. It fits too perfect with the dates, that's why it seems odd that it wasn't from the factory....

EDIT: How does the differential build date correspond to the build date of the car?? If I remember correctly many cars had a differential build date about 1-2 weeks prior to the car build. Not a lot of rear differential inventory at the St Louis factory.[/QUOTE]

Powershift

[/QUOTE]

For model year 1966, C = November for St Louis built bodies, but C = October for AOS built bodies. I assume that the car has a St Louis body??

Larry

fsc66

For model year 1966, C = November for St Louis built bodies, but C = October for AOS built bodies. I assume that the car has a St Louis body??

Larry[/QUOTE]