Great, thanks Jerry. I got a two speed rear with 4.33 high, installed it, put a correct Tru-stop disc brake in(the disc in there was 2" too small, would lock up when applied, would have to back up to get it to release) drove it around for a while, one rear cylinder failed, drove it around some more to test out the two speed on the manual brake only, waiting to take rear brake apart to replace. Engine runs great after new exhaust valves, guides, milled head .090" , fresh air intake.

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.