The Rear Axle Page

 

 

The rear axle differential assembly in my 1964 Chevy C60 was actually a replacement unit. The first (and I'm assuming original) rear axle differential assembly was in the dump bed when I purchased the truck. Curious to why it had been replaced I decided to take it apart and try to determine the reason for its replacement. Click on the thumbnail to review the disassembly process and inspection of the rear axle differential assembly.

 

Single and Dual Speed Rear Axle Specifications

 
               

Chevrolet Single Speed Rear Axles

Rear Axle Capacity

11,000 lbs

15,000 lbs

17,000 lbs

   Ratio 6.17:1 7.20:1 6.17:1 7.20:1
   Make Chevrolet
   Type Full Floating
   Brake Size 15 x 4.00

15 x 6.00

   Gear backlash 0.005" - 0.008"
   Differential Type Four-Pinion
   Lubrication capacity

18 pints

19 pints
Maximum gear reduction in lowest transmission gear
(axle ratio x transmission ratio)
  4-speed Chevrolet 43.56 50.83   50.83
  5-speed New Process   53.35   53.35
  5-speed Clark 265V   54.57   54.57
  5-speed Clark 267V       43.63
  5-speed Spicer 3153     37.02  
  5-speed Clark 264VO     37.39  
  Powermatic   38.09    

 

Chevrolet Single Speed Rear Axles

 Rear Axle Capacity

18,500 lbs 23,000 lbs 30,000 lbs bogie 34,000 lbs bogie
   Ratio 5.57:1 7.17:1 5.43:1 6.67:1 7.17:1 5.57:1 7.17:1 6.50:1
   Make Eaton
   Model 1790A 1910 30D 34D
   Type Full-Floating
   Brake Size 15 x 7.00 15 x 6.00 15 x 7.00
   Wheel Type Cast/Disc Cast Cast/Disc Cast
   Gear Backlash 0.005" - 0.008"
   Differential Type Four-Pinion
   Lubrication Capacity 22 24 22 24
Maximum gear reduction in lowest transmission gear
(axle ratio x transmission ratio)
  5-speed Spicer 3152   54.13   50.36 54.13 49.08
  5-speed Spicer 5652B   50.76   47.22 50.76 46.61
  8-speed Fuller R46 50.97 65.61 49.68 61.03 65.61 59.48
  Powermatic 29.47 37.93 28.72 35.28 37.93 34.39

 

Chevrolet Two-Speed Rear Axles

 Rated Axle Capacity

15,000 lbs 17,000 lbs
    Ratios 6.40/8.72:1 5.83/7.95:1 6.40/8.72:1
    Make Chevrolet
    Type Full floating planetary reduction
    Brake Size 15 x 4.00 15 x 6.00
    Gear Backlash 0.008" - 0.015"
    Lubrication Capacity 20 pints
    Speed Range High Low High Low High Low
Maximum gear reduction in lowest transmission gear
(axle ratio x transmission ratio)
  4-speed Chevrolet 45.18 61.56     45.18 61.56
  5-speed Spicer 3153     34.98 47.40    
  5-speed Clark 267V 38.78 52.84     38.78 52.84
  5-speed New Process 47.42 64.61     47.42 64.61
  5-speed Clark 264VO     35.33 48.18    

 

 

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