Model Code: RN48D

Engine

• 2.4 L (2366 cc) 22R Single Overhead Camshaft (SOHC) I4, 97 hp or 98 PferdStarke (PS) where PS=0.986xhp (72 kW) at 4,800 rpm and 175 N·m (129 lb·ft) of torque at 2800 rpm

 
Transmission

• According to the VIN plate the truck came with a L52 5-speed transmission but when I got her she had 4-speed. I’m assuming it was as L45.

 
Transfer Case

• Type 1-B Carb 4Cyl (based on Transfer Case Identification from Marlin Crawler)
  • Installed 1981 – 4/1983
  • Top Shift
  • Short Style Case
  • Short Low Range Shift Rod
  • C-Clip Retained 2WD/4WD Rod
  • 8mm Flange Bolts
  • Noisey Style Gears
  • 21 Spline Input
  • 27 Spline Outputs

 
Differential Gear Ratio

• From what I have read online, 1981 was the only year the gears were 3.90 which might help explain why the truck was so under powered.  Unfortunately I did not verify this when I had the differentials regeared. If it was 3.90 I’m going to be revving a little high compared to factory specifications even with 32″ tires.
• Updated during remodel:
  • 4.56 – Eaton Truetrac in back, open in front

 
Wheels and Tires

• 15×5″ 1/2-JJ rims from door plate
  • Center Bore: 106.1mm
  • Pitch Circle Diameter (PCD): 6 x 139.7mm (6 x 5.5″)
  • Lug nut thread size: M12 x 1.5
• H78-15 tires = 225/75-15 tires (diameter: 28.29”, width: 8.86”, circumference: 88.87”, sidewall height: 6.64”)
• When I bought the truck the original wheels and tires had been changed to
  • 15×8″ rims with 33″ tires
  • The rims were 8 spoke steel with chrome finish and had about 3.5″ of back spacking
  • At the time I replaced the 33″ tires with 31 x 10.5″ BF Goodrich All Terrain tires
• Updated during remodel:
  • 16×7″ 8 spoke steel chrome rims
  • 265-75 R16 BF Goodrich T/A KO2 tires

 
Body

• Regular Cab 2 door pickup
• Deluxe Long Bed 4WD trim level