8 3/4 Rear/Brake Line

ConValiant64 said

Another question: Am I able to use the same driveshaft, or is the one from my 7 1/4 different?

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Your existing driveshaft will be about 2” too long, and if you’re running the original trans with the ball and trunnion front coupler, you will need to have your existing driveshaft shortened!