This special 3R universal joint has a recessed body which allows installation in the old Buick/Cadillac CV's. The older CV's have a cap which needs to be installed after the universal joint is installed in the CV (that is why the 3R51-31 needs the recess). The standard 3R joint (without the recess) cannot be installed in these special CV units.

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Cross References:
3R5131

Mfr Part Number:

3R51-31

Series:

3R

Class:

LD

Style:

ISR

Cap 1 Dia:

1.125

Stack 1:

2.556

Lube:

N

OEM Man:

SAGINAW

OEM Series:

3R