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Re: MT653 allison no 4th or 5th gear
Posted to HD/Fleet Forum on 8/28/2013 11 Replies

Dan, On the left side of the trans, There are 2 psi taps. They are next to each other. The forward and slightly more recessed one is main psi. The rear one is gov psi. On the right side toward the front is the lockup psi tap.

Hook up to these and go for a dr... Login to read more.

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