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Re: MT653 allison no 4th or 5th gear
Posted to HD/Fleet Forum on 9/1/2013

Hi Dan A couple of things to try. I think the gage was on the rear? Of the 2 left side taps.(which is governor pressure) try moving it to thr forward 1 it's recessed in a little. This is main pressure and should be consistent high pressure in lower gears until... Login to read more.