Who sells a 3.42 gear set for my 8.5 12bolt rear in my 70 cutlass at a reasonable price? Been searching and I find plenty for a 10 bolt but have not found anything for a 12 bolt rear end! Any replies are greatly appreciated!

 

Jim, a member here, is a differential builder. He can supply you with all the parts you need. His screen name is Monzaz . Reach him here thru pm or go to his website http://www.jdrace.com/

 

Jim is a good resource for O-Type parts for sure.

Richmond Gear makes/sells ring and pinion sets for the O-Type rear, but they are made to fit the factory 3.08-3.23 carrier.

https://www.richmondgear.com/wp-cont...n1.pdf#page=32

 

I also highly recommend Jim (monzaz) for parts. He will answer any of your questions and supply the parts needed at reasonable prices.

 

What ratio do you have now ? Monzaz is the guru !

 

I used this;

http://www.ronsmachiningservice.net/

They had everything in stock for O-axle, good prices, fast delivery and working online support.

 

Currently has 3.91 and the local racetrack has been shut down for a while now. So want a more streetable gear.

 

If those are factory gears the aftermarket ring gear won't work correctly as they are made for the 3.08-3.23 carrier. Years back someone had made ring gear spacers to use the aftermarket gears on the 2.56 carrier but you would be going the opposite way. You may need to locate a carrier to go along with the new gears.

 

Thanks for the replies! And Jim is messaging me with the correct information that I need! Again thank you to everyone!

 

to re-use your original carrier you will need an OEM 3.42 crown and pinion. The aftermarket 3.42 gear set is designed to work on the 3 08 / 3.23 and new modified 8.8" carriers.

Jim aka Monzaz is a great source for Type O parts. You may also wish to contact Brian Trick.