Want to change gears from 3.08 to 3.73 on my 1975 buick lesabre

Im looking to swap gears on my 75 buick leasabre convertible. It currently has 3.08 and i want go to 3.73. Car is current not posi and in ok with that as long as i can go to 3.73. Do i have many options to upgrade? Or is it hard to find those gears for my car? Point me in right direction.

Thanks

 

This is a picture of my rear end if that helps.

 

You plan on an overdrive also?

 

10 bolt 8.5 ...you are good to go for the swap.
All you will need are gears ...but you should get a master bearing and rebuild kit to go with it as a good kit will have all the parts you need to set-up the gears correctly. Shims crush sleeve bolts lock tight etc.
If you can not find a kit I have them on the shelf here. Gears too.
Jim
JD Race

 

Interesting, didn’t know the 10 bolts are in the big cars

 

I believe they are only in the cars with a 350. 455s got something different.

 

yES, low powered cars centurion, Catalina, Impala etc...very base model motors 350 2 bbl stuff. Look for the chevys first. Even if it is c-clip grab it. Ends can be modified for Moser race axles and 30 spline axle spline up grade too. Around here all the big cars are extinct like the dinosaurs ...DEMO DERBY TO DEATH!