i do know that my 1990 silverado that i sold today that if the speedo is not working it wont shift into the last gear because it cant show the trans how fast its goin and it leaves the last shift point out
id just find a good used motor it will save you alot of trouble in the end cause if you put all that money into it and it dont fix it your gonna be pissed
Slowly but surely hope to have it done by my birthday cause im gonna drive it all day its fun to drive and its a standard my first one to own at that i love it