lifted f350 gearing options

[hashim]

hi guys, I have a f350 that is lifted on some 40 inch toyo mud terrains. I have the intake/exhaust/egr and gear head tuning on the truck but currently am running the stock 3:73 gears. What gear ratio would you all recommend for this tire size? I was thinking 4:30's but searching around I have seen some folks say 4:56. I dont plan to run any smaller of a tire. It is a DD and long trip vehicle 3-4 times per year, any help would be appreciated. thank you!

 

[Andrew]

I'm on 40's and run a 4.30 I like it I did ride in a 4.56 gear on 40's truck down the hwy it seemed to rev a but higher than I would like..

 

[hashim]

I forgot to add my truck is a 2008 f350, i dont know if it makes a difference with the OD and gears, does your truck have OD? my truck is at like 1500 rpms at like 60mph.

 

[Snake]

7.3? 6.0? 6.4?

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[Daddyusmaximus]

I run 4.30s with my lifted 7.3 running on 35s. It does limit my top end, but I drive like a grandpa, 65/70 max. Pulls like a beast off road. If you aren't gonna do hard offroading 4.30s should work. Depends on your engine. I think the newer 6.0s and 6.4 rev higher than the 7.3.

 

[CSIPSD]

4.30's for 40's...

 

[dieselmandustin]

A friend of mine has a 99 350 on 40s he has 4.56 gears. Drives like a stock truck. But on intestate it revs a bit much for me. I would think 4.30 would be perfect.