Yukon Gear 4340 Chrome Moly Rear Axle For GM 10.5in 14 Bolt Truck 30 Spline
Narrowed a GM 14-bolt for a rock crawler, or need a short full-float shaft that will not twist under a locker and tall tires? Yukon Gear and Axle YA WGM14T-30-35 is a 4340 chromoly, 30-spline rear axle shaft for the GM 10.5 inch 14-bolt truck axle, made as a cut-to-length blank. Yukon describes it as fitting 31 to 35 inch applications, with an 8 x 3.562 inch flange bolt pattern. Price is for one shaft.
The GM 14-bolt is a full-floating axle. Each hub rides on its own bearings on the axle tube, so the shaft carries no vehicle weight; it only transmits torque from the 30-spline differential side gear to the hub flange. That is why full-float shafts fail by twisting along their length or shearing near the splines, rather than bending. Shorter shafts have less length to absorb shock, so a narrowed 14-bolt with a locker puts a lot of load into the splines. Yukon makes this shaft from high-tensile 4340 chromoly with cold roll formed splines and induction coil heat treating to hold up in that use.
Unbolt the axle flange at the hub and slide the shaft out; on a full-float axle the wheel can stay on the ground. Roll the shaft on a flat floor to check for a bend, sight down the splines for twist, and check the flange for cracks. Then measure: for a cut-to-length shaft you need the finished length for each side, and the two sides of a 14-bolt are different lengths. Our GM 14-bolt rear axle problems guide covers bearing, pinion and carrier faults to check while it is apart, and full-floating vs semi-floating axles explains why the shaft can come out with the truck on its wheels.
Yukon lists this shaft for the GM 10.5 inch 14-bolt truck axle with 30-spline side gears. Yukon's page title calls it a 35.5 inch cut-to-length shaft while its spec bullets say it fits 31 to 35 inch applications, so treat it as a blank for builds that finish in that range, such as narrowed housings, and have a driveline shop cut and re-spline it to your measured length. Stock-width trucks usually need a longer shaft: Yukon's 34.8-38.8 inch chromoly 14-bolt shaft and the 38.2-42.2 inch version cover those lengths. Confirm the flange bolt pattern (8 x 3.562 inches), the spline count and whether you have a 14-bolt or an AAM 11.5 with the 14-bolt vs 11.5 guide, or send us the year and VIN.
| Brand | Yukon Gear & Axle |
| Part number | YA WGM14T-30-35 |
| Fits | Yukon Gear 4340 Chrome Moly Rear Axle For GM 10.5in 14 Bolt Truck 30 Spline |
| Type | Axles |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
Yukon titles it a 35.5 inch cut-to-length shaft and states it fits 31 to 35 inch applications. Measure each side of your finished axle and have the shaft cut and splined to that length.
Stock-width trucks usually need a longer shaft. Measure first; for 34.8-38.8 inch or 38.2-42.2 inch lengths we carry Yukon's longer chromoly 14-bolt shafts.
One shaft. The two sides of a 14-bolt are different lengths, so measure and order each side separately.
Yukon lists an 8 x 3.562 inch bolt pattern. Check it against your hubs before cutting.
75W-90 or 75W-140 gear oil. Add friction modifier only for a clutch-type limited slip that calls for it.
