Vogtskie Posted June 5, 2014 Share Posted June 5, 2014 I need some input on what gear ratio to use pulling a sidedump in the dirt, I currently have 3.86 and keep tearing the front one up and the price for rebuilt or used seems to have doubled over the last year and a half!! Please help me out with some ideas.Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/ Share on other sites More sharing options...
slpwlker Posted June 5, 2014 Share Posted June 5, 2014 4.17 or 4.42. whats the capacity on the rears? Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248076 Share on other sites More sharing options...
2stacksuperdog Posted June 5, 2014 Share Posted June 5, 2014 We run 4.17s in both our tractors pulling dump trailers and they go off road. One has a 6 speed and the other a 12 speed. They both have no problems. We have 4.64s in our triaxle. Quote Matt Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248077 Share on other sites More sharing options...
slpwlker Posted June 5, 2014 Share Posted June 5, 2014 Wonder if he has 38k rears. I could see tearing them up with a Belly dump but not so much a side dump. Not my area of expertise though Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248081 Share on other sites More sharing options...
2stacksuperdog Posted June 5, 2014 Share Posted June 5, 2014 Our R model with the 6 speed has 38k rears. No problems. Quote Matt Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248083 Share on other sites More sharing options...
slpwlker Posted June 5, 2014 Share Posted June 5, 2014 Idk something sure is going on with his Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248094 Share on other sites More sharing options...
blackdog2 Posted June 5, 2014 Share Posted June 5, 2014 What size tire what trans power divider auto or manual 1700 or 1800 series shaft ?? Quote Ed Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248095 Share on other sites More sharing options...
Vogtskie Posted June 6, 2014 Author Share Posted June 6, 2014 Sorry, Been working and chasing parts. I'm running 22.5 tires with a eaton 9 speed also has an air power divider. can I run 4.17's? Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248179 Share on other sites More sharing options...
RowdyRebel Posted June 6, 2014 Share Posted June 6, 2014 I run 4.17 gears w/ 11R24.5 rubber...basically like having 3.73's & LP22.5's...and that's about as "fast" as I'd even THINK about gearing a truck that spends any time off-road. I've replaced the front carrier twice now, and snapped the through shaft once. If I had the money, I would've swapped 'em both out for 4.42 or even 4.64, but money was tight and I could only afford to do the one that broke. Unless it breaks again, I probably won't do anything until I can upgrade to full lockers with the lower gearing...or better yet find a cut-off with 44-46K rears (mine are 38K) with a walking beam suspension, then upgrade that to a Raydan Air-Link or Hendrickson AR2 when I put it under my truck. If I could get the stouter axles on the air-walking beam with the lower gearing & full lockers, I'll have me a decent truck. Then I'll just have the steer axle beam left to upgrade (looking for a 16-18K axle to replace the 12.8K...already sprung for 16K, but tires are only good to 14.3K). I'm thinking maybe I ought to win the lottery... Quote When approaching a 4-way stop, the vehicle with the biggest tires has the right of way! Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248266 Share on other sites More sharing options...
2stacksuperdog Posted June 8, 2014 Share Posted June 8, 2014 We use to run a 78 R model with 3.86 gears on camelback. Had a 237, 5 speed. We used it for hauling into a landfill with 28 or 30 ton on every load. the 5 speed didn't like the landfill with it being a mountain so we put a 6 speed in and that truack ha d a air power divider and would spin the tires in first gear loaded. Was a little beast. Ran up until we retired it with a newer 350 put in and the same 6 speed and rears. truck also had 22.5s on it Quote Matt Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248547 Share on other sites More sharing options...
bts-4120 Posted June 9, 2014 Share Posted June 9, 2014 3.876 been know to give issues off road due to the smaller gear size but its usually happens with trucks with a 6spd all the extra reduction in reverse takes them out Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-248640 Share on other sites More sharing options...
Joe Ditchkus Posted June 23, 2014 Share Posted June 23, 2014 I run 4.56 full locker Rockwells on 11:24.5 with a 16908LL Fuller. We do some landfill work and I have no problems going off road. 38 rears might hold up in a dump trailer but in tandem or tri-axle dump work 46'S at mininum are the way to go.Joe D. Quote Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-250199 Share on other sites More sharing options...
rsb502 Posted July 7, 2014 Share Posted July 7, 2014 Wow a 9 spd doesn't have a very steep low gear, I'd run some 4.17 or 4.42's. Quote "Any Society that would give up a little LIBERTY to gain a little SECURITY will Deserve Neither and LOSE BOTH" -Benjamin Franklin"If your gonna be STUPID, you gotta be TOUGH" "You cant always get what you want, but if you try sometimes you get what you need" Link to comment https://www.bigmacktrucks.com/topic/35971-gear-ratio-for-running-in-the-dirt/#findComment-252044 Share on other sites More sharing options...
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