I believe the 1980 Chevy 4x4's are somewhat unique because that year was a cross over between the older and new body style, with the drive line parts being a bit mixed. I think your truck has a NP205 transfer case?? The 73-79 trucks had either a NP203 (full time 4x4) or NP205 (part time 4x4), and the 1980 trucks kept the NP 205. In 1981, the K10/20 trucks went to the NP 208C, and the parts from these will not work.
How many bolts hold the T-case to the transmission? If I recall, there are 6 bolts holding the t-case to the adapter, and 4 that attach the transmission to the adapter?? I can't remember for sure, as different transmissions used different adapters. I know the TH 350 and TH400 transmissions are different, and I don't recall if the manual transmissions use the same.
Am I correct?? It has been some time since I worked on these trucks.
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