Opinions on 4.73 effective ratio and daily use
Need to make a decision today to order my new gears. I've already discussed off line with Tom but I want to et a general concensus. Currently running 4.56 and 34.3s (4.20 effective) on my V10 Ex but feel it needs a little lower gearing with my 11K trailer. I wold minimally go with 4.88s which puts me at 4.50 effective over stock. Has anyone used 5.13 gears with this size tire or another combo that put them at 4.73 (or close to it) effective? If so, how did you like it when not towing and did you notice any difference in fuel mileage not towing? 80% of my driving is local with 45 mph max and half is in hilly area.
Thanks for any input |
Can't remember if I mentioned it before, but I did run 32"s with the 4.88s for two years, effective 4.80 ratio. It was a hotrod around town but it did suffer some mileage loss, went from 14-ish mixed driving when all stock (3.73s) down to 12.5 MPG highway with that combo.
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Opinions....
Probably a lot of fun running around town. Expensive experiment, though. |
That’s what busses and motor homes use.
The f450-550 chassis with gas motors and buses and motor homes use 5.30 gears from factory. Gvwr 25000
I have 4.30 gears and stock tires. I live in hilly country and would like more gear. I will not pay for it. However when hen I bought my truck it had 245 tires on it and I liked the effective gear ratio better than 265. It had a more usable od on highway for me. I rarely tow over 65. That effective ratio was close to what you are considering. I tow in 3rd on two lane hilly back roads at or under 55 and it would downshift less often to 2nd. If if you want to drop the 2$k on gears for the improvement then I think you will like it. Imho you have to change at least 2 steps in ratio for it to be worth it. If you pull hills a lot then maybe worth it. If you live in Florida put the $ in your ROTH and push the OD off button once and a while. If you want commuter mileage than take your foot out of it and leave for work 10 minutes earlier. I drive like a grandpa but my stuff lasts a lot longer and I spend less in fuel. |
Big tires?
How worn are your tires? Could you just go down a size or 2 when due for replacement?
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Originally Posted by Jakerichards1
(Post 18707269)
How worn are your tires? Could you just go down a size or 2 when due for replacement?
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@65 mph your RPM will go from 2000 to 2300 with 34” tires.
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Originally Posted by Tbug05LTD
(Post 18705097)
Need to make a decision today to order my new gears. I've already discussed off line with Tom but I want to et a general concensus. Currently running 4.56 and 34.3s (4.20 effective) on my V10 Ex but feel it needs a little lower gearing with my 11K trailer. I wold minimally go with 4.88s which puts me at 4.50 effective over stock. Has anyone used 5.13 gears with this size tire or another combo that put them at 4.73 (or close to it) effective? If so, how did you like it when not towing and did you notice any difference in fuel mileage not towing? 80% of my driving is local with 45 mph max and half is in hilly area.
Thanks for any input When not towing it was fine as well. I ran the 37s when not towing also, and it was nice but with the 32.6s or the 35s, it was great. |
I changed from 3.73 to 4.56 on 32.8" tires (BFG KO2'S) for towing my 10k lb trailer. Very happy with it and never looked back. Works fine towing in the mountains in upstate PA and NY. Now, if I was to do a LOT of towing that trailer in those mountains, I would probably want a 4.88 or more.
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When not towing it was fine as well. I ran the 37s when not towing also, and it was nice but with the 32.6s or the 35s, it was great.[/QUOTE]
Thanks Kai, I should be good for a mix of towing and every day with the 4.88s then |
Originally Posted by Tbug05LTD
(Post 18718576)
When not towing it was fine as well. I ran the 37s when not towing also, and it was nice but with the 32.6s or the 35s, it was great.
Yeah with 34.8" tires it'll be fine. though I didn't like towing with the 35s as much as with my 32.6" tires, just a couple hundred RPM was noticeable. Still far better than stock though. |
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