jim1305 Posted March 18, 2021 Share Posted March 18, 2021 i am having trouble downshifting the trans in high range-dualplex trans-i am trying to put some clutch brake in it,any advice on how to do this ? thanks Quote Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/ Share on other sites More sharing options...
Joey Mack Posted March 18, 2021 Share Posted March 18, 2021 The clutch brake is not for shifting while moving. It's for stopping the tranny when "stopped" so you can select a starting gear.. ie: 1st. rev. etc... may I suggest double clutching.... My silly way is to count... one-onethousand-- two...on 'two' i grab the next gear... Quote Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/#findComment-470926 Share on other sites More sharing options...
Maddog13407 Posted March 18, 2021 Share Posted March 18, 2021 in all my years i have never seen a 77 series trans with a clutch brake. 67, yes and rare. double clutch it. its not a diesel and they dont shift anywhere near the same Quote Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/#findComment-470929 Share on other sites More sharing options...
doubleclutchinweasel Posted March 18, 2021 Share Posted March 18, 2021 9 hours ago, Maddog13407 said: in all my years i have never seen a 77 series trans with a clutch brake. 67, yes and rare. double clutch it. its not a diesel and they dont shift anywhere near the same You said a mouthful! Double-clutching a gasser takes a little more practice than a diesel. I suspect it has to do with the rate at which the revs rise and fall. Passes by the sweet spot a little quicker. 1 Quote "Eagles may soar, but weasels don't get sucked into jet engines." Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/#findComment-470942 Share on other sites More sharing options...
HarryS Posted March 18, 2021 Share Posted March 18, 2021 ...and most gassers don't have a tach so you have to guess. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/#findComment-470954 Share on other sites More sharing options...
jim1305 Posted March 18, 2021 Author Share Posted March 18, 2021 thanks for the info. Quote Link to comment https://www.bigmacktrucks.com/topic/66282-1956-mack-b42sx-with-a-en402-gas-engine/#findComment-471005 Share on other sites More sharing options...
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