1973-81 Rear Differential - GM 12 Bolt with 8-7/8" Ring Gear and 30 Spline Pinion

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Kit components may vary from illustration depending on your truck's model.
How to choose the correct Ring & Pinion: Each ring and pinion gear set sold below is for replacement use only. Gear ratio changes are possible as long as the ratio selected is within the range of ratios available for the carrier. See chart below for carrier/case breaks by differential model.
Truck 12 Bolt
Series 2 = 2.73 - down (smaller numerically)
Series 3 = 2.76 - 3.42
Series 4 = 3.73 - up (larger numerically)
Full Parts List
Part # Description Application Reqd Price Stock Status QTY.
1973-81 STD Cab 1/2 Ton
1 34-2784
Finish:
Machined
Material:
Steel
Finish:
Machined
Material:
Steel
Axle Shaft-30 Spline 2 Wheel Drive 1/2 Ton 73-81 2 $99.95 In Stock
QTY Required
1 34-2782
Finish:
Machined
Material:
Steel
Finish:
Machined
Material:
Steel
Axle Shaft-30 Spline 4 Wheel Drive 1/2 Ton 73-81 2 $109.95 Backordered
QTY Required
2 30-1614
Lock Clip-Axle 1/2 Ton 73-81 2 Temporarily
Out Of Stock
No Backorders
3 34-0520
Material:
Steel
Material:
Steel
Rear Wheel Bearing 1/2 Ton 73-81 2 $10.95 In Stock
QTY Required
4 34-0150
Rear Wheel Oil Seal 1/2 Ton 73-81 2 Temporarily
Out Of Stock
No Backorders
5 38-1806
Finish:
Chrome
Material:
Steel
Finish:
Chrome
Material:
Steel
Differential Cover-Chrome 1/2 Ton 73-81 1 $19.95 In Stock
QTY Required
6 30-4354
Material:
Paper
Material:
Paper
Gasket-Cover 1/2 Ton 73-81 1 $5.95 In Stock
QTY Required
7 30-2543
Finish:
Chrome
Material:
Steel
Finish:
Chrome
Material:
Steel
Bolt Set-Chrome 1/2 Ton 73-81 1 $7.95 In Stock
QTY Required
8 34-0555
Material:
Steel
Material:
Steel
Differential Master Kit 1/2 Ton 73-81 1 $84.95 In Stock
QTY Required
9 34-0551
Material:
Steel
Material:
Steel
Differential Bearing Kit 1/2 Ton 73-81 1 $72.95 In Stock
QTY Required
10 34-0491
Material:
Steel
Material:
Steel
Side Bearing 1/2 Ton 73-81 2 $14.95 In Stock
QTY Required
11 30-0280
Finish:
Zinc
Material:
Steel
Finish:
Zinc
Material:
Steel
Ring Gear Bolt 1/2 Ton 73-81 12 $0.55 In Stock
QTY Required
12 32-9080
Material:
Steel
Material:
Steel
Internal Kit-30 Spline "A"
  • "A" Fits models without positraction or limited slip differentials.
1/2 Ton 73-81 1 $106.95 In Stock
QTY Required
  • "A" Fits models without positraction or limited slip differentials.
1973-81 STD Cab 1/2 Ton
13 34-5150
Material:
Steel
Material:
Steel
Pinion Shaft "A"
  • "A" Fits models without positraction or limited slip differentials.
1/2 Ton 73-81 1 $19.95 In Stock
QTY Required
  • "A" Fits models without positraction or limited slip differentials.
14 32-9050
Material:
Steel
Material:
Steel
Pinion Gear "A"
  • "A" Fits models without positraction or limited slip differentials.
1/2 Ton 73-81 2 $23.95 In Stock
QTY Required
  • "A" Fits models without positraction or limited slip differentials.
15 30-0614
Material:
Steel
Material:
Steel
Washer "A"
  • "A" Fits models without positraction or limited slip differentials.
1/2 Ton 73-81 2 $2.95 In Stock
QTY Required
  • "A" Fits models without positraction or limited slip differentials.
16 30-0613
Color:
Black
Finish:
Phosphate
Material:
Steel
Color:
Black
Finish:
Phosphate
Material:
Steel
Washer "A"
  • "A" Fits models without positraction or limited slip differentials.
1/2 Ton 73-81 2 $2.25 In Stock
QTY Required
  • "A" Fits models without positraction or limited slip differentials.
17 30-0481
Color:
Black
Finish:
Phosphate
Material:
Steel
Color:
Black
Finish:
Phosphate
Material:
Steel
Pinion Shaft Lock Screw 1/2 Ton 73-81 1 $9.50 In Stock
QTY Required
18 32-9020
Material:
Steel
Material:
Steel
Ring & Pinion 3.08 1/2 Ton 73-81 1 $179.95 Backordered
QTY Required
18 32-9022
Material:
Steel
Material:
Steel
Ring & Pinion 3.42 1/2 Ton 73-81 1 $174.95 In Stock
QTY Required
18 32-9021
Material:
Steel
Material:
Steel
Ring & Pinion 3.73 1/2 Ton 73-81 1 $199.95 In Stock
QTY Required
18 32-9023
Material:
Steel
Material:
Steel
Ring & Pinion 4.11 1/2 Ton 73-81 1 $174.95 In Stock
QTY Required
19 34-0466
Material:
Steel
Material:
Steel
Rear Pinion Bearing 1/2 Ton 73-81 1 $22.95 In Stock
QTY Required
20 30-2916
Color:
Black
Finish:
Phosphate
Material:
Steel
Color:
Black
Finish:
Phosphate
Material:
Steel
Spacer 1/2 Ton 73-81 1 $6.95 In Stock
QTY Required
21 34-0462
Material:
Steel
Material:
Steel
Front Pinion Bearing 1/2 Ton 73-81 1 $16.95 In Stock
QTY Required
22 34-0154
Material:
Steel/Rubber
Material:
Steel/Rubber
Pinion Oil Seal 1/2 Ton 73-81 1 $5.95 In Stock
QTY Required
23 34-5122
Material:
Die Cast
Material:
Die Cast
Yoke 1/2 Ton 73-81 1 $104.95 Backordered
QTY Required
24 30-0687
Finish:
Zinc
Material:
Steel
Finish:
Zinc
Material:
Steel
Washer 1/2 Ton 73-81 1 $4.95 In Stock
QTY Required
25 30-0890
Color:
Black
Finish:
Phosphate
Material:
Steel
Color:
Black
Finish:
Phosphate
Material:
Steel
Pinion Nut 1/2 Ton 73-81 1 $5.95 Backordered
QTY Required
26 30-1970
Finish:
Zinc
Material:
Steel
Finish:
Zinc
Material:
Steel
Filler Plug 1/2 Ton 73-81 1 $1.15 In Stock
QTY Required
Close
Part # Description Application Reqd Price Stock Status QTY.

Vehicle Application

Includes Parts for the Following Models:

1973 Chevy C10 Pickup 1974 Chevy C10 Pickup 1975 Chevy C10 Pickup 1976 Chevy C10 Pickup 1977 Chevy C10 Pickup 1978 Chevy C10 Pickup 1979 Chevy C10 Pickup 1980 Chevy C10 Pickup 1981 Chevy C10 Pickup 1973 Chevy K10 Pickup 1974 Chevy K10 Pickup 1975 Chevy K10 Pickup 1976 Chevy K10 Pickup 1977 Chevy K10 Pickup 1978 Chevy K10 Pickup 1979 Chevy K10 Pickup 1980 Chevy K10 Pickup 1981 Chevy K10 Pickup 1973 GMC C15 Pickup 1974 GMC C15 Pickup 1975 GMC C15 Pickup 1976 GMC C15 Pickup 1977 GMC C15 Pickup 1978 GMC C15 Pickup 1979 GMC C15 Pickup 1980 GMC C15 Pickup 1981 GMC C15 Pickup 1973 GMC K15 Pickup 1974 GMC K15 Pickup 1975 GMC K15 Pickup 1976 GMC K15 Pickup 1977 GMC K15 Pickup 1978 GMC K15 Pickup 1979 GMC K15 Pickup 1980 GMC K15 Pickup 1981 GMC K15 Pickup

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