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Will a 4l60e transmission from 1994 fit my 1999 suburban?

It's *possible*, but not guaranteed. While both are 4L60E transmissions, there were revisions and changes made to the 4L60E throughout its production run. A 1994 4L60E might have different valve bodies, internal components, or even a different bellhousing pattern than a 1999 4L60E designed for your Suburban. This could lead to compatibility issues.

To be certain, you need to:

* Check the bellhousing: The bellhousing bolts to the engine. Make absolutely sure the bolt pattern matches your 1999 Suburban's engine. A mismatch here means it won't bolt up at all.

* Compare the output shaft: The length and diameter of the output shaft might be different, affecting compatibility with your driveshaft and transfer case.

* Consider the valve body: Internal differences in valve bodies can lead to incompatibility with your vehicle's computer and control system. This could result in poor shifting or complete failure.

* Get the transmission's identification number: This number will help determine the exact specifications of the transmission. You can then compare that to the specifications for your 1999 Suburban's 4L60E.

In short, while it *might* work, the odds are against it being a direct, plug-and-play swap. It's highly recommended you find a 4L60E from a similar year Suburban (or at least a similarly equipped GM vehicle) to ensure compatibility. Otherwise, you risk significant problems and added costs for further repairs.

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