In 1991 chevy used 3 differant trasmission's a 4L60-E, 4L80-E and a 700R4 in 1993 they used 2 differant transmissions a 4L60-E and a 4L80-E if your truck has the 700R4 then the 93 transmissions will not work if you ned to find out what you have in your truck and what is in the other truck. if they are the same they will swap the only diffance in the ext. cab and reg cab is the drive shaft. but the transmission have to be the same modles a 4L60-E will not replace a 4L80-E and nothing will replace the 700R4.
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