Richmond Gear 1304000070 Super T-10 4-Speed Transmission, GM 2.43

Part number 1304000070 is Richmond Gear's widest-ratio Super T-10, running a 2.43:1 first gear built more for drivability than outright launch aggressiveness, and carrying a 375 lb-ft torque capacity. Input and output shafts carry 26 and 32 splines respectively, the same spline counts used across Richmond's Super T-10 line, inside a lightweight aluminum case with heat-treated gears throughout.

What this torque rating fits

A rating in the 375 lb-ft range suits a milder street engine rather than a heavily built one, even on a case that otherwise looks similar in weight and construction to other Super T-10 part numbers. Strut-type synchronizers and constant-mesh first and reverse gears keep shifts crisp despite the wider gear spread, and the side-cover shift linkage design keeps that shift action familiar to anyone who has driven a classic GM four-speed before.

Fitment and lubrication

Dry weight lands around 70 lbs with a 12-inch tailshaft out back, and the gearbox calls for roughly 2.4 pints of gear oil in the GL-4, 80W-90 weight. A bellhousing, shifter, and slip yoke are left out of the box, and a performance clutch kit with a pilot bushing is also needed to finish the install.

What warranty does it carry? A 1-year warranty applies against defects traced to materials or assembly when the transmission is installed correctly.