r686st Posted February 24, 2015 Share Posted February 24, 2015 I have a '92 RW613 and am curious how you think it will do with 11-24.5's. It currently has 4.17's with 11-22.5's and a Mack 350, Eaton Fuller 9. What are the overdrive and crawl ratio's with these two setups as well as the top speeds in both cases? Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/ Share on other sites More sharing options...
RedBullDog Posted February 25, 2015 Share Posted February 25, 2015 (edited) Back when i was trying to figure out what gearing to look for while truck shopping I used this calculator. http://www.csgnetwork.com/rearendgearcalc.html11/22.5s are 42 inch tires, 11/24.5s are 44. Edited February 25, 2015 by RedBullDog Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-280554 Share on other sites More sharing options...
j hancock Posted February 25, 2015 Share Posted February 25, 2015 .73 over with a 4.17 is a high ratio of 3.0441. On the low side with 12.57 it will have an effective ratio of 52.4169. That will stay the same with either tire size.At 2000 rpm with 22.5 will be 82 mph. 24.5 86 mph.I would leave it alone. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-280598 Share on other sites More sharing options...
r686st Posted February 26, 2015 Author Share Posted February 26, 2015 Do you think the 24.5's will be too hard on the clutch/transmission when starting off at a red light or from the pit loaded? Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-280654 Share on other sites More sharing options...
scottwetzel Posted February 26, 2015 Share Posted February 26, 2015 I have a 88 with 24.5s 4.64 rears and a mack 9 speed. I wish I had 4.17s!! At 1800 rpms I'm doing around 74 mph. All superliners should have 24.5s.... Go for it. Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-280655 Share on other sites More sharing options...
j hancock Posted February 26, 2015 Share Posted February 26, 2015 With 52 to 1 on the low side, 24.5 won't be a problem in the dirt pile. Quote JimIt doesn't cost anything to pay attention. Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-280656 Share on other sites More sharing options...
felicello122 Posted March 2, 2015 Share Posted March 2, 2015 Do it, truck will be nicer to roll under when greasing or service, and you will do better on fuel mileage on the highway Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-281194 Share on other sites More sharing options...
rsb502 Posted March 2, 2015 Share Posted March 2, 2015 4.17's will work fine with 11r24.5's, I run an Eaton 9 speed and 11R24.5's with 3.65 rears on my RW and pull a lowboy every now and then, it takes off ok with about 90k gross. I would like to swap to 3.87 or 4.17 but what I've got is working. 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/39048-rw-ratio-opinions/#findComment-281224 Share on other sites More sharing options...
scottwetzel Posted March 2, 2015 Share Posted March 2, 2015 4.17's will work fine with 11r24.5's, I run an Eaton 9 speed and 11R24.5's with 3.65 rears on my RW and pull a lowboy every now and then, it takes off ok with about 90k gross. I would like to swap to 3.87 or 4.17 but what I've got is working. Your truck must have all kinds of top end!! 1 Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-281225 Share on other sites More sharing options...
r686st Posted March 5, 2015 Author Share Posted March 5, 2015 Thanks for all the help I'm going with 24.5's. Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-281557 Share on other sites More sharing options...
thomastractorsvc Posted March 5, 2015 Share Posted March 5, 2015 My 78 RW came factory with 24.5, 4.64, RTO12513 and a NTC 400 and was supposed to have a sleeper and haul gasoline and be a 70 mph truck (penciled in 65)**ended up that the dealer never installed the sleeper and put a dump on it** Quote Robert"I reject your reality and substitute my own." Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-281586 Share on other sites More sharing options...
rsb502 Posted March 5, 2015 Share Posted March 5, 2015 Your truck must have all kinds of top end!! Well I passed a certain white peterbilt owner on this page and he was doing 80, GPS had 3 digits on it when I finally let off and looked up at it. 2 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/39048-rw-ratio-opinions/#findComment-281617 Share on other sites More sharing options...
rsb502 Posted March 6, 2015 Share Posted March 6, 2015 My Edited Video: 2 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/39048-rw-ratio-opinions/#findComment-281629 Share on other sites More sharing options...
scottwetzel Posted March 6, 2015 Share Posted March 6, 2015 My Edited Video: http://youtu.be/PfP05L7WoZgThat was so wrong to blow that poor mans doors off like that!! Lol Quote Link to comment https://www.bigmacktrucks.com/topic/39048-rw-ratio-opinions/#findComment-281647 Share on other sites More sharing options...
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