QU40638U Used 30 Spline Left Inner Axle Shaft for 1972.5-1980 Chevy, GMC

QU40638U Used 30 Spline Left Inner Axle Shaft for 1972.5 to 1980 Chevy, GMC Dana 44 Front Axles is a used 30 spline Dana Left (Drivers Side) Inner Axle Shaft for all Dana 44 front axles in 1972.5 to 1981 Chevy Blazers, GMC Jimmys, plus Chevy, GMC 4x4 1/2 ton or 3/4 ton Pickups and Suburbans. Available while supplies last.

Also See: QU40638 New Left Inner Axle Shaft

Need More Info? Use the handy Links below to access over 40 years of Dan's product and vehicle specific Tech Notes to easily get the information you need for your vehicle's repair, maintenance, or upgrade project!

Dan the Gear Man® Tech Notes:
Dimensions
Years
Upgrading 1971 or early 1972
Applications

Tech Note 1: Dimensions
QU40638U Axle Shaft measures 36-1/8" from center of u-joint hole to end of spline. It takes universal joints made to Spicer 1350WJ dimensional specifications. The cup diameter for these u-joints is 1-3/16". The 4 matching u-joint cups are grooved to accept Inside C-Clip Snap Rings. The installed Clips fit against the machined inner faces of the axle shaft yokes. The distance between the inside of the axle shaft yoke ears is 2-3/16". For matching u-joints, see TK40712 and QU90007.

Tech Note 2: Years
General Motors first used QU40638 Inner Axle Shaft for the left (drivers or long) side in mid to late production 1972 model year Blazers, Jimmys, Suburbans, and 1/2 ton plus 3/4 ton 4x4 trucks. It was used in all subsequent GM Dana 44 front axles until the Dana 44 was completely replaced by the GM 10 Bolt Front Axle for the 1981 model year.

Tech Note 3: Upgrading 1971 or early 1972
If you have a 1971 or early 1972 GM Dana 44 disc brake front axle using Spicer 1310WJ axle u-joints with 1-1/16" diameter cups, it is possible to replace the axle shaft assemblies with the stronger, 1972.5 and newer parts that use Spicer 1350WJ axle universal joints with 1-3/16" diameter cups. The axle shaft lengths are the same. The only problem we have encountered is there may be some interference between the end of the axle tubes and the larger inner axle shaft yokes which can be eliminated by grinding a little material off the back side of the yokes.
The parts you need to upgrade your 1971-1972.5 axles to the larger 1350WJ series axle u-joints are:
QU40221 Outer Axle Shaft
QU40058 Axle Shaft Slinger
QU40228 Spindle Bearing and Seal Kit
QU40638 Left Inner Axle Shaft
QU40637 Right Inner Axle Shaft
TK40712 or QU90007 Axle U-Joints

Applications:
Chevy and GMC:
K5 Blazer/Jimmy, 1/2 ton and 3/4 ton Suburban and Truck: 1972.5
K5 Blazer/Jimmy, 1/2 ton and 3/4 ton Suburban and Truck: 1973, 1974, 1975, 1976
K5 Blazer/Jimmy, 1/2 ton and 3/4 ton Suburban and Truck with Dana 44 Front Axle: 1977, 1978, 1979
3/4 ton Suburban and Truck with Dana 44 Front Axle: 1980