Freightrain Posted August 28 Share Posted August 28 12 hours ago, Nick mack rd686s said: Depends, up hill start 1st. Down hill start 2nd. On the flat 1st. Mine has a 4 spicer auxiliary gear box so under load I would start 2nd in auxiliary and 1st in direct then move up to 3rd in auxiliary then change into direct drive (3rd auxiliary) in 3rd drive. Then move up in as standard drive 4th,5th. The only problem I have is down shifting the auxiliary gear box down , I can not do it. It is impossible? Like any transmission you have to have enough engine rpm to be able to speed it up to downshift . My 6041 Spicer is about 250 rpm split just like my triplex compound so it downshifts just as easy as the compound. I assume yours is a deep under 1st like mine? You can't shift in/out of it while moving. If you are in low enough gears in main box, you can't get enough RPM to downshift the aux. I don't use my aux in lower gears. Typically just highway speed, using the OD(4th). I have used it instead of my compound(leave my compound in direct). The aux doesn't shift as smooth(sloppy linkage) so I don't do it normally. 1 Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment https://www.bigmacktrucks.com/topic/23830-driving-the-trxl-1071/page/2/#findComment-557739 Share on other sites More sharing options...
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