Loco Posted September 17, 2011 Share Posted September 17, 2011 I have a 1982 R 686 St with 300 hp 4:17 rears 24.5 wheels and a TRXL 107 two stick 6 speedI use the truck for road boring in witch we drill a horizontal hole and then hook a 3/4 steel cable to the Mack and in reverse we pull out the mud out of the hole so the contractor can install his pipeThe TRXL 107 as a gear ratio of 36:66 in 1 Rev, 21:32 in 2ND, 12:11 in 3RD 7:07 in 4Th,4:27 in 5ThThe truck has a steel bed with two 1000 gal steel tanks and when the tanks are full I have all the traction and power to break a 3/4 steel cable rated over 60,000 lbs in rev a little over idle when I an in 1ST reverseMy problem is in the 2001 CH 613 has a E7 427 with 3.86 rears 24.5 wheels and a RTO 16908LLit has three reverse gears Low Low is 15.22 Low Reverse is 9.95 and Hi Reverse is 2.89I need to figure out how is the best way to get close to those low gears in the R modelIs there a transmission with those low gear to fit the E7 427 or would an axillary transmission be the way to go don't know which one will be the best or most economicalThanks Chris Quote Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/ Share on other sites More sharing options...
Superdog Posted September 18, 2011 Share Posted September 18, 2011 you'd be way better off to keep the R model for that kind of work in my opinion Quote Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/#findComment-86234 Share on other sites More sharing options...
Underdog Posted September 18, 2011 Share Posted September 18, 2011 I second the motion. Your R seems to be in good condition and well set up for the required task. Cheaper to keep 'er.Gregg Quote Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/#findComment-86272 Share on other sites More sharing options...
Loco Posted September 18, 2011 Author Share Posted September 18, 2011 The picture of the truck is like the pictures the Lady's on on line dating site that they post ..... not to recent. The trunnion on the rear end broke and I had it welded back to get back on the job so it stays on the job along with a lot of other problems I really need to replace the truck .The CH613 may not work as well as a R model. I like the way the CH 613 looks over the R model but its not the work horse the R is Quote Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/#findComment-86301 Share on other sites More sharing options...
Rob Posted September 18, 2011 Share Posted September 18, 2011 The picture of the truck is like the pictures the Lady's on on line dating site that they post ..... not to recent. The trunnion on the rear end broke and I had it welded back to get back on the job so it stays on the job along with a lot of other problems I really need to replace the truck .The CH613 may not work as well as a R model. I like the way the CH 613 looks over the R model but its not the work horse the R isI'd prolly go with a heavy spec'd truck with winches doing to "tugging". A lot of power can be had with eight wheels locked on solid ground and a hundred thousand, (or so) pounds of force exerted by a couple large winches. Easier on drivelines too.Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/#findComment-86304 Share on other sites More sharing options...
TOMD Posted September 21, 2011 Share Posted September 21, 2011 .I WOULDN'T USE THE CH. IT'S MADE FOR OVER THE ROAD. YOU'LL BREAK ALOT OF STUFF AND TRUCK WILL BE PIECE OF JUNK. GO WITH NEWER RD. Quote Tom ~ Parts & Service SpecialistWatt's Mack Sales, Inc. 1-888-304-6225 Link to comment https://www.bigmacktrucks.com/topic/20642-2001ch613-to-replace-1982-r-686-st-but-i-have-a-problem/#findComment-86552 Share on other sites More sharing options...
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