Raven9 Posted 7 hours ago Share Posted 7 hours ago So my compound box is shot, 78 mack R 300 twin stick, reverse keeps hanging up even tho the stick feels like it pops out gear, causing lots of problems working. Spoke with shop that used to rebuild the duplex and do these swaps all the time, says the parts for the compound box were obsolete about 10 years ago. A member has reached out on here and has a 13spd mack and a 8LL mack transmission to do my swap. At 2000 rpms I'm at 68mph. I am leaning toward the 8LL just didn't want to loose any mph with it, I'm in Missouri so lots of hills, hollars etc. just looking for some experienced advice. Thanks! Quote Link to comment https://www.bigmacktrucks.com/topic/75535-8ll-or-13spd-for-dump-truck-swap/ Share on other sites More sharing options...
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