I did a cut and paste from a prior post, thought you might find this helpful in figuring out which transmission you have. Keep us posted...
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Transmission ID is a little trickier, and while the pattern layout on the shifter can help in identifying the trans model, Allison installs a tag factory that will be on the right rear of the trans case (which for RE models will be toward the driver's side axle tube). This tag will have an unmistakable stamping of the trans model (AT545, MT643, 2000, MD3060 are the most common).
A 2002 is likely to have the 2000 or MD3060, I believe the AT545 and MT643 were only available as reman units by then, no longer a factory offering in new vehicles. A 2000 will have a T-handle shifter with either
R N (D) D 2 1
or
R N D 4 2 1
The MD3060 will have a flush console with an LED display, and buttons for R, N, D and up / down. This transmission is actually a six-speed auto, but sixth gear is locked out for skoolies. There is info here about how to unlock it if equipped with this transmission.
But remember, the only way to positively ID trans model is to crawl under and read the tag. For some, the shifter can only narrow it down to a choice of two.
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