Hey guys, First post and first time square body owner. I bought an 86 k10 swb with a 305 in it, 4x4. I had to do some brake and starter work to it but yesterday was really the first time that i got it out on the road. Im not sure what tranny it has in it, but it shifted 2 times (auto) and the cruising rpm at 55mph was around 3200. I feel that that is alittle much but I dont really have much to go on? The truck has 33s on it which probably make a difference. Can anyone tell me how to the find out what tranny I got and if 3200 is normal? All the tags on the door and stuff have been mismatched and what not due to it being a basket case of body parts. Thanks.