| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | Brownie boxes were designated(sized) based on the engine torque, thus a 5000 series was designed to go behind a 500 ft. Lb. engine. I think that a 6000 or 7000 series Brownie would be appropriate for your application. It also depends to some extent on the GVW of the vehicle.
In general, 6000 and 7000 series boxes are more plentiful because many people want one for a pickup, of course they weigh slightly more, but a few hundred pounds doesn't much difference in a truck.
If your truck doesn't have a parking brake, look for a Brownie with an attached brake.
Last edited by EdPruss; 08/17/2014 8:43 PM.
'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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