Transmission Problems? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
An online subscription to All Data or Mitchell on Demand would be your best manual option. Here are the things to effect reverse. https://dl.dropboxusercontent.com/u/90220402/cfreverse.png Have you checked the tubes between the Mechatronics and case to make sure none are damaged able to leak, effecting the pressure to the reverse clutch?
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The shaft seals that the forward and reverse clutch ride on and get there pressure from is the only other thing I can add that you may have overlooked.
All the seals on the shaft which get fluid pressure from the mechatronics to the 2 clutch packs.
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