rewdoxiepup Posted June 29, 2006 Share Posted June 29, 2006 Good Morning All,Can anyone tell me why on my R-400 there's a dash tag that says " Do not use 1st or 2nd underdrive in the aux. trans. when in 5th in the main trans". It is a quadraplex 18 spd.. Is the jump from 4th direct to 5th direct possible without taking a nap waiting to get into 5th gear ?. Just a question from a Roadranger person, never owned a married Mack type transmission. The only trans. iv'e had that even comes close is a 5X4 in a 1974 Paystar Tri Axle log truck with a 400 Cummins. Thanx E.S.D. Quote Link to comment Share on other sites More sharing options...
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