C2 rear-end gear ratio?

There are numbers on the housing but the standard rear gear for the

PDeen

Look for a sheet metal tag attached to one of the differential cover bolts; if present it has a stamped 2-letter code indicating the ratio. I think a 63 250hp ordered with a 4spd would have come stock with a 3.08 non-posi., code "CZ". If by chance it originally had a 3-spd (3,540 cars came that way, most of them probably 250hp) and the 4spd was added after purchase, it would have had code "CA", the code for 3.36 non-posi, the most common ratio in '63; "CB for 3.36 posi, "CC" for 3.55 posi, "CD" for 3.70 posi., "CE" for 4.11 posi, "CF" for

Or, place a chalk mark on the sidewall of a rear tire, at the bottom (with the car on level pavement in neutral), and another chalk mark on the driveshaft or a driveshaft U-joint where you can see it if you look under the car. Have someone slowly push the car forward for a count of 3 tire revolutions while you scoot along on a mechanics dolly counting how many times the driveshaft mark makes a revolution; divide the driveshaft revolution count by the tire revolution count and you'll have the ratio. The more tire revolutions you make, the more accurate this method would be.

The metal tag may have been, but none of my C-2s had one. I've always found the code stamped into the flange where the axle cover mates to the housing - on the bottom surface closest to the roadway.

Here's waving to ya - \||||

Owen ___

'67BB & '72BB

-- not affiliated with JLA forum in any way -- alt.autos.corvette is original posting -- ___

"To know the world intimately is the beginning of caring." -- Ann Hayman Zwinger

Thanx for the info. I appreciate it- lib

You can always do what us 'old school' guys do, which is lift the rear end off the ground, put a mark on the driveshaft, and rotate the rear wheel 1 revolution, counting the amount of revolutions of the driveshaft.

Easy and simple.

Chuck