The 248 won't limit your highway speed, your rear-end gear ratio will. I know that the '54 hydramatic has the same low gears as the manual tranny trucks. I don't know about '55. Anyway, the 248 should be sufficient if you use a higher gear ratio.


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.