Tutorial 0 Videos 2 Comments 0 Reviews Recommended Comments Freightrain 3,494 Posted July 16, 2010 Is it a Mack? Then the 5 and 4 are pretty std and nothing fancy. NO, you don't need to shift BOTH at the same time. Save that for after you get the hang of it. Shift the main, then come back and shift the compound. If it's any other brand, YES, there are different 5 spds. Some are regular 5 spd, some have 5th gear up/over to the left instead of the std position. Get on Youtube and search quad box or twin stick shifting and you'll see quite a few variations. Something to chew on til you need to do it yourself. Quote doubleclutchinweasel 1,886 Posted August 13, 2014 I grew up on a 5 + 4 Mack Quadruplex. Freightrain is correct about one thing; save the "split-shifting" with 2 hands till you get used to it! But, you don't necessarily shift the MAIN first. UPSHIFT whichever box you need to shift first, then DOWNSHIFT the other. If you try to downshift the main first, for example, you probably won't have enough RPM to do so. And, if you can, there's really no need to split-shift. I can give you a couple of different patterns to use. There is also a slight difference between an 18-speed and a 20-speed. Since the Hi-Split and 5th geear are both overdrive in the 18, there are a couple of gear combinations which are duplicates, and should be skipped. On the 20, there are no duplicates. First of all, the LO-LO on the compound is rarely used. In fact, the only time I ever used it, other than for backing, was to get moving in a steep place, and then only with one or two gears. First Sequence (18-speed box) (this will work for most conditions, and has no split shifting): LO-SPLIT 1st LO-SPLIT 2nd LO-SPLIT 3rd LO-SPLIT 4th DIRECT 4th (this is your 1:1 gear) HI-SPLIT 4th (overdrive) HI-SPLIT 5th (double overdrive) Second Sequence (18-speed box) (for heavy loads): LO-SPLIT 1st DIRECT 1st HI-SPLIT 1st LO-SPLIT 2nd DIRECT 2nd HI-SPLIT 2nd LO-SPLIT 3rd DIRECT 3rd HI-SPLIT 3rd LO-SPLIT 4th DIRECT 4th HI-SPLIT 4th HI-SPLIT 5th If you need more on the bottom end, start out in LO-LO 1st, go to LO-LO 2nd, then to LO-SPLIT 1st. On the 20-speed, just split 5th the same as 1st-4th. The heavy-duty models had the 4-speed compound on the left, and the 5-speed main on the right. Some of the lighter ones had tat reversed. 1 Quote Join the conversation You can post now and register later. If you have an account, sign in now to post with your account. Add a Comment × Pasted as rich text. Paste as plain text instead Only 75 emoji are allowed. × Your link has been automatically embedded. Display as a link instead × Your previous content has been restored. Clear editor × You cannot paste images directly. Upload or insert images from URL. Insert image from URL × Desktop Tablet Phone Submit Comment
Freightrain 3,494 Posted July 16, 2010 Is it a Mack? Then the 5 and 4 are pretty std and nothing fancy. NO, you don't need to shift BOTH at the same time. Save that for after you get the hang of it. Shift the main, then come back and shift the compound. If it's any other brand, YES, there are different 5 spds. Some are regular 5 spd, some have 5th gear up/over to the left instead of the std position. Get on Youtube and search quad box or twin stick shifting and you'll see quite a few variations. Something to chew on til you need to do it yourself. Quote
doubleclutchinweasel 1,886 Posted August 13, 2014 I grew up on a 5 + 4 Mack Quadruplex. Freightrain is correct about one thing; save the "split-shifting" with 2 hands till you get used to it! But, you don't necessarily shift the MAIN first. UPSHIFT whichever box you need to shift first, then DOWNSHIFT the other. If you try to downshift the main first, for example, you probably won't have enough RPM to do so. And, if you can, there's really no need to split-shift. I can give you a couple of different patterns to use. There is also a slight difference between an 18-speed and a 20-speed. Since the Hi-Split and 5th geear are both overdrive in the 18, there are a couple of gear combinations which are duplicates, and should be skipped. On the 20, there are no duplicates. First of all, the LO-LO on the compound is rarely used. In fact, the only time I ever used it, other than for backing, was to get moving in a steep place, and then only with one or two gears. First Sequence (18-speed box) (this will work for most conditions, and has no split shifting): LO-SPLIT 1st LO-SPLIT 2nd LO-SPLIT 3rd LO-SPLIT 4th DIRECT 4th (this is your 1:1 gear) HI-SPLIT 4th (overdrive) HI-SPLIT 5th (double overdrive) Second Sequence (18-speed box) (for heavy loads): LO-SPLIT 1st DIRECT 1st HI-SPLIT 1st LO-SPLIT 2nd DIRECT 2nd HI-SPLIT 2nd LO-SPLIT 3rd DIRECT 3rd HI-SPLIT 3rd LO-SPLIT 4th DIRECT 4th HI-SPLIT 4th HI-SPLIT 5th If you need more on the bottom end, start out in LO-LO 1st, go to LO-LO 2nd, then to LO-SPLIT 1st. On the 20-speed, just split 5th the same as 1st-4th. The heavy-duty models had the 4-speed compound on the left, and the 5-speed main on the right. Some of the lighter ones had tat reversed. 1 Quote
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