How do I know if I have a 8.5 or 8.6 rear end?
If you're unsure whether your vehicle has an 8.5 or 8.6 rear axle, there are a few ways to determine the exact model. This information is important for selecting the right replacement parts or accessories for your car or truck.
Identifying the Rear Axle Type
The easiest way to identify your rear axle type is to look for the axle identification tag. This tag is usually located on the rear axle housing or differential cover and will clearly state whether it's an 8.5 or 8.6 model. If the tag is missing or unreadable, you'll need to inspect the axle housing itself.
- An 8.5 rear axle will have a housing diameter of 8.5 inches.
- An 8.6 rear axle will have a housing diameter of 8.6 inches.
You can measure the diameter of the axle housing to determine the model. Another way is to look at the brake components - an 8.5 axle will have smaller brake components than an 8.6.
Why the Difference Matters
Knowing whether you have an 8.5 or 8.6 rear axle is important because the two models use different parts and components. Attempting to install the wrong parts can lead to fitment issues or even damage to your vehicle. For example, the ring and pinion gears, differential cover, and brake components are all specific to the 8.5 or 8.6 axle type.
Properly identifying your rear axle is the first step to ensuring you purchase the correct replacement parts or upgrades for your vehicle. Taking the time to inspect the axle housing or locate the identification tag can save you time and money in the long run.
