Gear ratio and tire size

[BIGN]

What is everyone using? How do they run down the road when not towing?? RPM's at highway speeds

[BIGN]

The reason im asking is cause im running 3.73's and 35" tires and wanted to know what is a good in between ratio to go to. 05 f350 6.0

[indasand]

Are you trying to get back to the original final drive ratio you had before the 35" tires????

[BIGN]

ya or just a little beter towing than stock. had one place till me 4.88's and another say 4.56's

[indasand]

I'm 4:11.... I'd save the lower stuff for 4 wheeling..... not a daily driver/towing truck....

[BIGN]

dans driveline told me 4.88's i still wana be able to do 80+ without a triler but pull ibecks at 55 last weekend with head wind i did 45

[kr350]

I have 37's on my 04 6.0 and was told to use 4.30's on a diesel by Adam's Driveshaft. It seems that the 4.88's would run high rpm's on 35's

[BIGN]

i was thinking 4.10's would put me close to stock ratio

[barefoot bob]

i run toyo 38s on a 4:10 ratio its comparable to 3:70 ratio on stock tires

[painterjoe]

4.88 is overkill, with 35's I'd leave it.

[EY3BA11]

what size tires were stock on it?

Use this calculator. This will tell you where you need to be to get back to the stock ratio..

http://www.rocky-road.com/calculator.html

[White Rhino]

what size tires were stock on it?

Use this calculator. This will tell you where you need to be to get back to the stock ratio..

http://www.rocky-road.com/calculator.html

very cool

[BIGN]

what size tires were stock on it?

Use this calculator. This will tell you where you need to be to get back to the stock ratio..

http://www.rocky-road.com/calculator.html

32's were stock. calculations say 4.10's. i was thinking 4.27's that way it would give me a little beter towing

[lvnalolife]

I run 4:56's with my 38's. With 35's i wouldn't go more than a 4:33. Call Adams drive shaft. James really knows his stuff. He will get you exactly what you want. Dan's told me 4:88's once too. Right now I can cruise around at 80 no problem.

[Brian73]

The reason im asking is cause im running 3.73's and 35" tires and wanted to know what is a good in between ratio to go to. 05 f350 6.0

I'm in the same boat, only with the 7.3l. When I get some extra dough I'll go with 4.30. My reason, tire calculater say's 4.23 (I really don't remember the exact number) so my theory is this; It is equal cost to change to a 4.11 or 4.30. In my opinion a 4.11 will not make much difference so I would go with the 4.30. 4.88 is bad advice because you will get terrible millaege and lose top speed. They are great for towing but if this is a daily driver its a bad idea. FYI I had a f-550 with 4.88's and the best I ever got (empty or loaded) was 315 mi on a 38 gallon tank