| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | So, do you have 6 bolt Budd wheels or 5/10 on 7.25" wheels? Perhaps you have Dayton wheels?
Anyway, another option would be to put a 'brownie' aux. trans in the driveline. Relatively easy to do, 5500 or 5800 series would be the right size, although a 6000 series would also work, just a little bit larger. Watson aux. boxes are a little bit fragile. I put a 5831 in my '53 GMC with a 302 which had 6.6 single axle, would cruise at 70 if the load wasn't too heavy.
You probably have a park brake on the back of your existing trans., so it would be best to find a 'brownie' with attached park brake, although intact ones are rare. Tru-stop brake pads are available.
Ed
Last edited by EdPruss; 08/01/2018 12:50 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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