11bravo, the w56 is extremely strong, but if your in cali i would work something out with marlin for a swap on the 150 and get a L52HD, it uses a G54 gear set and keeps the short tranny for the tight space in the 1st gen cab, i think the w56 is like 8 inches longer than the L43 but the L52 or L52HD from marlin will bolt right in.
so where are you