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Quick Reference Help Topics
Ring Gear Diameter
Ring gear diameter can be a helpful way to identify which differential you have. The ring gear diameter is measured across the face of the gear. To obtain the ring gear diameter, simply place a tape measurer across the gear. This can be tricky if the ring gear & carrier are still in the housing.
In some cases, a differential can be identified by the number of cover bolts is has. Count the number of cover bolts on your differential to help identify which differential you have.
Some differentials have a dropout which bolts to the front of the axle housing. Check your housing to see if it has a dropout on the front.
Some late model vehicles come with independent rear suspension. Check your rear housing to see what kind of suspension it has.
Independent Rear – Left and right axles can move up and down independently of each other
Solid Rear – Has a solid housing
Pinion Nut Size
Checking your pinion nut size can be helpful in identifying your differential. To check the pinion nut size, the driveline must be disconnected from the pinion yoke. With the driveline disconnected, check the socket size that fits your pinion nut.
Differentials are available with many different axle spline counts. If you have your axles removed, count the number of splines on the axle. It’s helpful to mark one of the splines with a marker when counting the number.
Determining the float type of your differential can help narrow down your search. The float type is the method in which your axles are secured into the housing.
C-Clip – Axle is retained into the housing by clip inside the carrier. Axle shaft rides on a bearing that is pressed into the housing.
Bolt In – Axle is retained into the housing by a retaining plate. Axle bearing is pressed onto the axle shaft.
Full Float – Axle is bolted to an axle hub. The axle hub also houses the axle bearings and races. Axle shaft does not have a machined bearing surface.
Some axles can be identified by the lug pattern diameter of their axles. If you are searching for axles shafts for your vehicle, please check your lug pattern by measuring from the center of the axle to the center of one of the studs. Multiply the measurement by two (2) to find your lug pattern.
Some vehicles are equipped with different size brake pilots on their axles shafts. If you are searching for axle shafts for your vehicle, please check your hub diameter as shown in the photo. The hubs typically have a step on them. Be sure to measure the hub near the flange, as shown, to find the correct hub diameter.
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