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Would a rear end off 1994 Chevy Silverado work on 1999 Silverado?

It's possible, but not guaranteed. While both are Silverados, there were changes in chassis and suspension components between the 1994 and 1999 model years. The axle width, bolt pattern, and spring perch locations are the key things to check.

You'll need to verify the following:

* Axle Width: Measure the width of both rear ends. Even a small difference can cause problems.

* Bolt Pattern: Confirm the lug bolt pattern (number of lugs and circle diameter) matches.

* Spring Perch Location: The location of the spring perches on the axle housing must be compatible with the 1999 Silverado's leaf springs.

* Brake Components: The brake components (drums or rotors, calipers) may not be interchangeable.

* Differential Gear Ratio: Consider the gear ratio. A mismatch could lead to drivetrain issues.

In short, while it *might* fit, it's highly recommended to compare these dimensions directly between the two rear ends before attempting installation. Failing to do so could lead to significant mechanical problems.