TREMEC TR-4050 Pro Fit HD Kits


The TREMEC 4050 is the latest aftermarket manual transmission designed for heavy duty 4WD & 2WD truck applications. American Powertrain is hard at work adapting the 4050 to your favorite heavy duty classic trucks, and 4×4 applications with our new line of Pro Fit HD kits.

The TREMEC TR-4050 5-speed manual transmission is designed for longitudinal engine vehicles and is particularly suited for light and medium duty trucks. It includes a single overdrive and a light-weight aluminum housing

All forward gears are fully synchronized and use a carbon friction material for improved shift quality. Tapered roller bearings are used to minimize noise, vibration and harshness (NVH) and improve efficiency.

A standard six-bolt Power Take-Off (PTO) located on the right side of the transmission offers users the ability to run a variety of hydraulic accessories.

4050 shift pattern
TREMEC 4050 Shift Pattern

TR-4050 Features at a Glance:
• High-contact constant mesh helical gears for maximum strength
• Die-cast aluminum alloy housing saves weight while offering
considerable rigidity
• Standard right-hand six-bolt PTO offers ability to run hydraulic pumps
• Multiple shifter locations provide design and installation flexibility
• The multiple rail internal shifter provides excellent shift feel and
• Tapered bearing on input, main and counter shafts provide
excellent internal stability
• Needle bearings under gears reduce friction and noise output
• All forward gears and reverse gear synchronized
• Advanced synchronizer technology promotes smoother shifting and
reduced shift effort
• Counter shaft mounted 5th gear synchronizer improves NVH in

TREMEC 4050 Specifications
TREMEC TR 4050 Specs
GM Square Body 4WD TREMEC TR-4050 Pro Fit HD Kit
GM Square Body 4WD TREMEC 4050 Pro Fit Hd Kit