Re: u joints for my 72
The following are the correct u joint part numbers for spicer u joints available for the drive shaft in your truck.
5 - 153X if it has 1.063" cups and outside snap rings (more common for 350 turbo trans in 1/2 ton)
5 - 178X if it has 1.188" cups and outside snap rings ( more common with 400 turbo trans in 1/2 ton)
5 - 3147X if it has inside snap rings. (more common in 3/4 ton)
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