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Pontiac of the Month

JAH11's 1968 GTO

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You question is a little difficult to answer without knowing a little more information. What are you planning on doing with the car? How much can you afford? How big / powerful is your engine and transmission going to be?

The '67 came stock with a 10-bolt 8.2" rear end. Heck GTOs, Judges, and Firebirds came with these rear ends from the factory. So perhaps converting the stock diff from an open diff to posi-traction is all you need to do and it's the cheapest way to go.

The next step up would be to purchase a GM 12-bolt rear end. You can custom order one from Strange, Mosier, or Western Diff to fit your application. They will custom build you a rear end to the proper width, stock mounting brackets, and your choice of drums or rear disc brakes.

Another popular hot rodding choice would be a Ford 9-inch differential. Again companies like Strange, Mosier and Curry can help you out there.

Buying a new custom diff will be the most expensive route and it may require you to shorten or customize your driveshaft to fit, and perhaps a new rear yoke. Adding rear disk brakes requires changes to the proportioning valveĀ as well.

So be honestĀ and ask yourself what you do want to do with this car, especially a big car like the Ventura.

Edited by Frosty
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