All too often the average enthusiast installs a killer engine into his Chevy only to find that the car doesn't accelerate like it should. He then realizes that the factory 2.73 rearend gears are holding the engine back. Whether your vehicle is meant for drag racing or top speed cruising, it's crucial to have the proper rear gear.
The plan here was to upgrade the 10-bolt in our pal Larry Richard's 175-mph '87 Monte Carlo. His 7.5-inch 10-bolt carried a 3.73 gear ratio, but it needed a new posi, bearings, and axles. The 3.73 gear ratio combined with Richard's six-speed transmission allows the 355ci 500hp engine to make use of every last bit of horsepower when he's well into triple-digit speeds. To get the project done, we contacted Drivetrain Direct in Corona, California. Drivetrain Direct supplied its rearend-rebuild kit and a pair of Superior axles. The kit includes a Superior ring-and-pinion, Timken bearings, an Eaton posi, and all the necessary shims and gaskets. The company also lent us its head mechanic, Martin Barraza, who showed us how to properly rebuild the rearend.