Rear Axle offset for 12 bolt stock rear?

[g356gear]

This was the reply from Wilwood. I have no idea which direction to go....

"There are two popular kits for your application, and the only difference is the offset. Kit 140-7141-D has a 2.81" offset, and kit 140-7149-D has a 2.75" offset. Otherwise, both kits are 12.2" in diameter with black calipers, drilled rotors, and the Parking Brake Kit."

Could the different offsets be to allow for different wheel applications? I spoke with Frank at Prodigy and he recommended a completely different part # 140-9315 for staggered shocks on a stock 12 bolt with C Clips and 2.75" offset. The 140-9315 is listed as 68-81 Camaro. The others are listed as Chevy 12 bolt.....maybe the staggered shocks is the determining factor here. You would think a Wilwood rep would know what they are selling.





SKU: 140-9315
140-9315 FDL P/S Park Brake Kit
1968-81 Camaro 12 Bolt 2.75” offset

SKU: 140-7141
140-7141 FDL P/S Park Brake Kit
Chevy 12 Bolt w/ C-Clips

SKU: 140-7149
140-7149 FDL P/S Park Brake Kit
GM C-Clip 12 Bolt-2.75” Offset

[thedude327]

I was looking at the wilwood kit too and the best reason I could come up with is that there were some slight discrepencies during manufacturing of the 12 bolt rears. It is probably critical on the wilwood kit beacause it incorperates a drum with the rotor for the parking brake setup and the distance needs to be correct for the drum portion of the rotor to slide all the way over the parking brake shoes. Also the wilwood kit uses 1/2-20 thread size wheel studs which means that you have to drill out your axles and fit larger studs in them or buy new aftermarket axles with the 1/2" wheel studs installed to make it work properly.

Paul