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Just bought it . Have problems with trans not shifting out of 1st gear . Raised it up it has a 6L80 trans . I'm looking for the trans control module external box has 2 plugs one for ecm and the other plug goes to the rear of trans to the control module internal !??? HELP !!!! Thanks
 

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TrailblazerSS
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Those are not the TCM for a 6L80. It's an adapter to mate the 4L70E harness from the ECM to the TCM on the 6L80, which is INSIDE the 6L80 pan
 

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Good luck trying to find that adapter thing anymore, as it's probably the hardest part to find for the swap
 
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