Yes, GMCpanel, the Hydramatic was available in '54 GMCs and in '53 GMCs but not in '48 GMC civilian models.
I agree with Spanky. Chevys make excellent parts trucks for GMCs.

"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.