Straydog954 Posted May 11 Share Posted May 11 Running 22.5 rubber on dump truck with a 300 maxidyne. Taking out the 5.73 rears due to swapping in a 12 speed with different final gear ratio. Trying to figure out if 5.02 would give me the same deep reduction off road that I have with my T2070. I am more interested in off-road performance than highway speed. I’m thinking either 4.42, 4.64 or 5.02 Any opinions are much appreciated Quote Link to comment https://www.bigmacktrucks.com/topic/74147-gear-ratio-q/ Share on other sites More sharing options...
terry Posted May 11 Share Posted May 11 I had a dump truck with a 285 and a 12spd with 4.17’s never had a problem off road, and had a real good cruising speed. Also had 22.5 tires. Terry Quote Link to comment https://www.bigmacktrucks.com/topic/74147-gear-ratio-q/#findComment-551528 Share on other sites More sharing options...
mrsmackpaul Posted May 12 Share Posted May 12 I think any of the ratios would be fine, a 12 speed in deep reduction is really really slow and you can break the drive line if your rough in deep reduction So I can't imagine any situation where it won't be lower geared enough with any of the ratios suggested Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74147-gear-ratio-q/#findComment-551541 Share on other sites More sharing options...
Straydog954 Posted May 12 Author Share Posted May 12 Looks like the low gear in the 12 speed is 14.44 and the T2070 is 14.16. The big difference is the .78 OD in the 12 compared to .60 in the 7 speed. I think the 5.02 will still give me decent startability in soft ground with an ok top speed. Quote Link to comment https://www.bigmacktrucks.com/topic/74147-gear-ratio-q/#findComment-551575 Share on other sites More sharing options...
Mark T Posted May 12 Share Posted May 12 5.02 and .78 OD with 20" rubber is gonna max out mid sixties tops. I'd think it'd be good in soft ground. Like good enough that the short tires would be more a hinderance than the gearing. And like Paul mentioned, easy to damage itself if misused . Quote Link to comment https://www.bigmacktrucks.com/topic/74147-gear-ratio-q/#findComment-551576 Share on other sites More sharing options...
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