If you're planning on using the SM-420 make sure you get the yoke that bolts to the trans output shaft and the slip joint that's attached to the front driveshaft yoke. That said, finding a 3100 4-speed drive shaft may be hard to do as most 3100's came with 3-speeds that had a splined output shaft.

Mike B smile


Mike Boteler

1956 Chevy 3100 Resto Rod
1952 Willys M38 Army Jeep
1983 Jeep CJ7 Laredo
1984 Jeep CJ7
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Silver Spring, MD