I'm looking at buying a 98 GMC 1/2 ton ext 4x4. It is out of town so I'm not able to get a visual on it yet. Pics are coming monday. They sent me a copy of the build sheet and the tranny code is MT-1 TRA 4-SP ELECTRONIC AU. My question is can anyone out there tell me if this is a
4L60E or 4L80E tranny. Thanks.

Dave