Hello,

Is an SM420 Transmission, an SM420 Transmission? Did they ever vary?

I just purchased on line, because of the great price, and am not sure of the year of it.

However, I have a 51 GMC Truck, long bed.

Will any SM420 work?

Need to know!

Thanks!!!!

Dallas

Broccoli is for chopping, classic trucks are for restoring!

-51 102 22 C GMC