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ericlb
05-31-2007 04:29:29
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Re: OT question , 1965 GMC 420 SM flatbed in reply to ratface, 05-30-2007 20:23:18
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what that truck has is a 2 speed rear end, the procedure is first with the truck idling sift the switch, should be on the stick, but many early gm,s had it on the dash, listen for the "click" to see if it does indead shift, this is probably a vacuum shift model and may or may not work after all these years, it also could have been replaced with a electric shift type, [ better] to drive, the procedure is start out in first gear and low axle, when you get some rpm up let up on the gas, shift the switch then rapidly push and release the clutch to allow the mechanism to work then apply power again after you get speed up and need another gear, shift to the next gear, after the stick is in the gear but before you engage the clutch , pust the switch back to low axle, and use this procedure up thru the gears, when climbing a hill, in any gear in high axle, when you start to lose power, shift to low axle then power up again, it will take a few miles to get used to this, bu the tay if your in flat country, you can get by with out using the 2 speed at all, just get it in hi axle and go
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