What transmission is in a 1991 c1500 5.7 auto?
The 1991 C1500 with a 5.7L engine (350 cubic inch) most likely used a TH700-R4 automatic transmission. However, there's a small chance it could have a different transmission depending on options and specific trim level, but the TH700-R4 was the overwhelmingly common choice for that year and engine combination.