If your customer truely wants an indestructable rear end, you can get a Quaiffe (
www.quaifeamerica.com ) rear limited slip diff and a rear diff cooler. Archer Racing and others sell them, primarily to folks road racing their cars.
www.archerracing.com These rears are tough, and really work nice.
The Vipers rear end is a Dana pumpkin. Only thing most tumers do is install different gear ratios. If you want a top quality stout Viper rear end, buy it from Unitrax. It will exceed your expectations, they sell more Viper gears and rears than anyone... you'll also get it in a timely fashion and pay a reasonable price for a top quality piece. Ask for Devin, he knows (Viper) rear ends:
www.gounitrax.com
1280 N. Sunshine Way
Anaheim CA 92806
Phone: 800-622-4327
Devin King
[email protected]
"..UNITRAX is the leader in Viper rear axle ratio changes and repairs. We offer only the highest quality components at very competitive prices. We can perform the work on your Viper or you can ship your differential to our shop in Anaheim California. We offer one-day service on most jobs plus special upgrades to your differential. Let UNITRAX bring out the power your Viper craves!.."
You can also go to these fellows, they sell to lots of guy's drag racing their Vipers and sponsor the Ohio regions Viper Drags:
DTS 26400 Groesbeck Highway
Warren MI 48089
Phone: 800-521-0628
Gordon
Specialists in rear-end gear installations.
$1750: Viper rear-end assembly outright with
gears of your choice.
$450: gears of your choice installed in
customer supplied Viper rear-end assembly.
(Not sure if these prices are still correct)