SKU: PFGM-40001 Categories: ,

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If you don't know what you need, call our technical sales staff at 931-646-4836


American Powertrain Pro-Fit 4WD kits for 73-87 Chevy/GMC 

Featuring the TREMEC TR-4050 Heavy Duty 5-Speed

  • Similar to the NV4500. Direct replacement 
  • 600 lb/ft of torque capacity 
  • Aggressive 6.16 “Granny” Gear 1st gear but with economical .76 5th gear
  • 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 the ability to run hydraulic pumps
  • The multiple rail, internal shifter provides excellent shift feel and performance
  • Tapered bearing on input, main, and counter shafts provide excellent internal stability
  • Needle bearings under gears reduce friction and noise output
  • Fully synchronized
  • Advanced synchronizer technology promotes smoother shifting and reduced shift effort
  • 5th gear synchronizer mounted to the countershaft to improve NVH in overdrive
  • 3.67 qt oil capacity

Gear ratios: 6.16, 3.11, 1.71, 1, .76 od. rev 6.03
– 10 spline input shaft / Output 23-spline
– Torque rating 600lb-ft
 – A 6-bolt PTO mount location 6 bolt circle output flange.
–  NV4500 bolt pattern


  • Torque Capacity  –  600 lb.ft  /  813 n/m 
  • Oil Capacity – 3.7 QT  /  3.5ltr.
  • Weighs 164 lbs.  /  74kg
  • 19.5″ overall length
  • .590″ Pilot diameter
  • 5.125″ Index retainer diameter
  • 1.125″ Input shaft diameter, 10-spline, 6.5″ length

Works with 10- Spline input NP205. Adapter included. We do not have an adapter for the 27-Spline NP205. 

Trans will also work with any 23-spline NP style transfer case. 

30-50% increase in fuel economy
Low RPM cruising for greatly reduced driver fatigue and an improved highway driving experience. 
Reduced engine wear leading to longer engine life
Cooler engine operating temperature.

Kit includes:

White Lightning Shifter for TR4050

Bellhousing for 4050

Hydraulic bearing

Pilot Bearing – Stainless rollers, grease pre-pak
Reverse Light Harness – Weatherseal
Shifter Knob
Hardware, Instructions, Warranty

Got an LS swap? We can make it easy. 

Hydraulic clutch recommended. Can use a stock pedal and factory hydraulic master cylinder for some model years.  Complete hydraulic system available for Squarebody and pedal assembly.

Weight: lbs

Dimensions: W" x H" x L"

If you don't know what you need, call our technical sales staff at 931-646-4836