Gears
Senior User
Joined: Dec 2017
Posts: 282
Likes: 2
What size tires are you running? Most guys run 35's and they simply suck the power out of a 6.2, some 4.56's will put it back where it needs to be, given the option I would run a 4.88 with 35's as that would allow the 6.2 to pull in 5th/6th.
Senior User
Joined: Oct 2017
Posts: 319
Likes: 4
I wouldn't jump to 4.56 is all you are going to run is 35's. I believe a truck with 37's and 4.30 is still geared lower than a truck with 33's and 3.73.
Trending Topics
Elder User
Joined: Sep 2011
Posts: 522
Likes: 21
From: Minnesota
I have a 6.2 with 4.30’s and installed 35’s a few months ago. The truck had the 275/70/18’s and it should have changed my effective ratio to about a 4.1 or so. That’s what I remember looking up prior to making the tire change. The seat of the pants feel isn’t much different in acceleration or performance either. My mileage hasn’t changed enough to notice either. I just found a tire size/gear calculator online and you can enter in your combinations and it will give you the effective ratio.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Prolocutor
Joined: Jan 2009
Posts: 13,618
Likes: 1,247
From: Western MA
Many like Yukon. Randy's is a popular place to check what's available and order. Since you have a gasser, you have the Sterling 10.5 as opposed to the DANA M275. I tried looking up a 2017 on Randy's site and they only show M275 options that fit the 6.7. However, I searched by Ford 10.5 and see all the options for your Sterling diff. Don't forget, since your 4x4, you'll need to do the front too. https://www.ringpinion.com/DiffWizard.aspx
Senior User
Joined: Mar 2018
Posts: 178
Likes: 1
From: St. Pete FL
https://eastcoastgearsupply.com/
I ran 4.88 yukons in my 6.2L Sierra. It was a beast even with the 38/15.50 hankooks.
I ran 4.88 yukons in my 6.2L Sierra. It was a beast even with the 38/15.50 hankooks.
Posting Guru
Joined: Dec 2017
Posts: 1,441
Likes: 8
Don't fear the gear.
4.30 is a waste of $2000. If you're going to do it, go 4.56 (36") or 4.88 (38"). 4.30 is hardly an improvement with the gasser, maybe perfect with the diesel though. Yukon has the proper gears. Add a Yukon Grizzly locker up front at the same time, or the zip locker if you can't handle a Detroit style diff. It's only $500 more and takes the F250 Fx4 to Powerwagon levels of 4x4 competence.
4.30 is a waste of $2000. If you're going to do it, go 4.56 (36") or 4.88 (38"). 4.30 is hardly an improvement with the gasser, maybe perfect with the diesel though. Yukon has the proper gears. Add a Yukon Grizzly locker up front at the same time, or the zip locker if you can't handle a Detroit style diff. It's only $500 more and takes the F250 Fx4 to Powerwagon levels of 4x4 competence.
Thread Starter
|
Mountain Pass
Joined: Sep 2015
Posts: 133
Likes: 4
Don't fear the gear.
4.30 is a waste of $2000. If you're going to do it, go 4.56 (36") or 4.88 (38"). 4.30 is hardly an improvement with the gasser, maybe perfect with the diesel though. Yukon has the proper gears. Add a Yukon Grizzly locker up front at the same time, or the zip locker if you can't handle a Detroit style diff. It's only $500 more and takes the F250 Fx4 to Powerwagon levels of 4x4 competence.
4.30 is a waste of $2000. If you're going to do it, go 4.56 (36") or 4.88 (38"). 4.30 is hardly an improvement with the gasser, maybe perfect with the diesel though. Yukon has the proper gears. Add a Yukon Grizzly locker up front at the same time, or the zip locker if you can't handle a Detroit style diff. It's only $500 more and takes the F250 Fx4 to Powerwagon levels of 4x4 competence.
thanks
Thread Starter
|
Mountain Pass
Joined: Sep 2015
Posts: 133
Likes: 4
Many like Yukon. Randy's is a popular place to check what's available and order. Since you have a gasser, you have the Sterling 10.5 as opposed to the DANA M275. I tried looking up a 2017 on Randy's site and they only show M275 options that fit the 6.7. However, I searched by Ford 10.5 and see all the options for your Sterling diff. Don't forget, since your 4x4, you'll need to do the front too. https://www.ringpinion.com/DiffWizard.aspx
thanks sir