| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | If you are keen on an AD truck, a 4BT will be a decent job as stated above. 6BT will definitely be a challenge. GMC trucks have slightly more room in the engine compartment since the engine is 3" longer, but fitting a suitable radiator and I'cooler will be a challenge.
Late model running gear with disc brakes should be used. Best use one ton running gear. Might want power steering(doable but a challenge) and brakes(doable.). If open to other options, larger than one ton GM trucks, 520, etc., for AD style, and T-18 for late '30's body style all have plenty of room for a 6BT, although with a slight weight penalty.
I have a '37 T-18 that has room for a 6BT, I'cooler, hydroboost brakes, power steering, full width modern front and rear axles.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
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