American Powertrain Introduces 4×2 TR-4050™ 5-Speed Pro-Fit HD Manual Transmission Kit For RWD 1988-98 Chevy/GMC OBS Trucks

Cookeville, TN (May 4, 2023) – American Powertrain, the nation’s leading distributor of TREMEC® transmissions, now offers a TREMEC 4×2 TR-4050™ 5-speed Pro-Fit HD manual transmission kit designed for RWD 1988-98 Chevy/GMC OBS light and medium duty trucks. This Chevy/GMC kit (#PFGM-40005) is manufactured with improved gearing for towing and hauling making it ideal for heavy-duty use.

The Chevy/GMC OBS 4×2 kit includes a short throw White Lightning Shifter designed for the TR-4050, a crossmember adapter bracket that works with the original factory crossmember, bell housing, hydraulic bearing, pilot bearing, reverse light harness, shifter knob, and all hardware for installation. The kit can be used with a stock pedal, however, a complete hydraulic pedal conversion system for OBS is available. 

The new OBS 4×2 Kit from American Powertrain features the new TREMEC TR-4050 4X2 transmission which has a torque rating of 600 lb-ft, and gear ratios of 6.16, 3.11, 1.71, 1, .76 od. Rev 6.03. Advantages with installation include a 30% increase in fuel economy, lower RPM cruising for greatly reduced driver fatigue, reduced engine wear for longer engine life, and cooler engine operating temperature.

Project “Papaw’s Dually”..Our 1989 OBS test truck equipped with a 454 big block and a TR-4050 5-speed 2WD trans. See it on Power Tour 2023 this June at the Tremec booth.

Features include:

  • High-contact constant-mesh helical gears for maximum strength
  • Diecast aluminum alloy housing saves weight while offering considerable rigidity
  • Tapered bearings on input, main and counter shafts provide excellent internal stability
  • Needle bearings under gears reduce friction & noise output
  • Revised fifth gear retainer eliminates problems associated with NV 4500 overdrive output shaft nut
  • All forward gears and reverse synchronized
  • Advanced synchronizer technology promotes smoother shifting and reduced shift effort
  • Countershaft mounted 5th gear synchronizer reduces noise in overdrive 

Matt Graves, Marketing and Sales Director says, “We have been getting a lot of calls about the TREMEC 4050 4×2 transmission since TREMEC released it, so we got to work developing conversion kits. Now, if you have a heavy-duty OBS Chevy/GMC truck that you use for towing and want a heavy-duty overdrive manual, this job can be one call and done and our customer service and tech support is second to none.” 

For more information about the TR-4050 4×2 kit for OBS trucks, visit To speak with one of American Powertrain’s highly qualified sales technicians, call 931-646-4836.

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