Jump to content
Forums Gone... but not forgotten!
Pontiac of the Month

hdkeno's 1969 Firebird

2023 March
of the Month

  • Welcome!

    Welcome to Forever Pontiac, where we keep the memory of Pontiac alive with great discussion, maintenance tips, restoration/modification progression "blogs" and help from professional & DIY mechanics. Also, wonderful competitions that occur regularly. Please register for an absolutely free account to join in!

67 grand prix 8 lug wheels replace?

Recommended Posts

I have  a 1967 Grand Prix with 8 lug rims and a posi rear end. My new motor is a 428 aprox 450 hp. Would this posi be strong enough? Would I be better off converting to front discs and drum rears with an upgraded posi?



Link to comment
Share on other sites

Tired of these Ads? Register Today!

My answer is yes since the motor is producing as much or more raw horsepower than stock. The big Pontiacs in '67 had anything from a tall 2.29 economy gear to a low 4.11 gear. So an upgraded posi is a good idea. You can re-build a stock 10-bolt to handle the power of the motor, you just have to select the proper hardened parts. So do your homework!

The eight lug drum brakes are nice looking but they are still 4-wheel drum brakes. Bringing a speeding 4200 lb behemoth to a stop is better suited for disc brakes. You will have to convert all wheels to 5-lugs, this means buy a new set of wheels in the deal. This is not a cheap conversion but it will be worth it.

Edited by Frosty
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Tired of these Ads? Purchase Enhanced Membership today to remove them!
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.