| Crusing in the Passing Lane Joined: Jun 2011 Posts: 5,096 | The problem with any 5 speed OD trans, is to make 5th OD in the direct 4th gear position, is they make OD the 3rd gear position, so there is a tremendous gap between 2nd and 4th, with a load, one cannot frequently make that jump to 4th., unless a two speed rear, so one is 2nd gear bound until the road levels out.
Makes it even worse with the closer ratio gears required with a diesel. On my 1 ton KB-5 with a 345, I changed out the trans to a direct 5 speed and changed the diff. ratio, much more useable setup.
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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