Swapping out differential gears.

[jhv48]

I've got SPF 2932. It came with the BTR differential and 3.46 gears. I'm trying to customize the trans and rear end ratios for my type of driving. I currently have a TKO 600 with the .64 fifth gear. I want to swap out the .64 for the .82 fifth gear but since I often can cruise at 75-80 mph, I want to also swap out the rear end for a 3.23 (or thereabouts). I'm told that the stock BTR rear end has no other ratios available. So how do I get the 3.23 rear end gears I need? If I need to swap out difs, which one is a direct swap?
I know someone out there has done this.

[eschaider]

i haven't done it but I have the BTR also. I priced gears for it out of Australia at one time. By the time they got to me the price was ~$600 for a ring and pinion. I decided this was not a good idea. I got an FRPP 8.8 IRS center and I am building it out with a DPI diff a set or Mark Williams billet caps and a set of 3.27 FRPP gears.

To mount it you need to build the mounts.


Ed

[Sideways]

DriveShaft.com
Might as well go for 31 spline half shafts while your at it. These guys can be of great help with your project...

[VintageUpgrades]

Have you thought about using a T56 transmission? The BTR is also called the GM 7.75 IRS; the only gears I know of are the 3.70 and 3.90 which are around $400.

[JBCOBRA]

I swapped out the .64 for a .82. Love it! Bob Hanlon did it for me. Great Guy. He had a customer that wanted the .64 instead of the .82. He also installed the carbon syncros. and re-did/checked everything. Very fair prices too.
Home | www.hanlonmotorsports.com

[jhv48]

We'll, after hitting a brick wall regarding a rear end gear swap, I decided to order a Levy racing custom alloy T-5 with a .80 fifth gear. Should shift better than my tko600 and easily handle the torque.

The .80 fifth fits my driving style a bit better than the .82 does. They also offer a .70 fifth gear but that one was still too tall for me.