Gearing
Thread Starter
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Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
Gearing
Well tonight I started thinking bout my rear gears.. With my lift and 35's I'm running about a final gear of 3.56 opposed to the factory 3.73 I had.. I'm highly considering 4.10 but I want to know something.. Right now I'm pulling a solid 13mpg with my lift and 35s.. If I move up to 4.10 to get my final gear back to 3.73 will my mpg drop? I imagine it'll make the engine work less to turn the tires..
If changing the back gears out, I have to change the front gears too right? Anyone recommend a shop to get the front/rear gears I need?
If changing the back gears out, I have to change the front gears too right? Anyone recommend a shop to get the front/rear gears I need?
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Storm,
MPG should be about the same or a little higher than you are currently getting now.
Yes you must re-gear both axles on a 4WD.
4.10 would be correct for your current tire size. But... if you are thinking about going larger (ie 37) in the future then think about 4.56 gears instead.
MPG should be about the same or a little higher than you are currently getting now.
Yes you must re-gear both axles on a 4WD.
4.10 would be correct for your current tire size. But... if you are thinking about going larger (ie 37) in the future then think about 4.56 gears instead.
Thread Starter
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Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
Originally Posted by blackhat620
Storm,
MPG should be about the same or a little higher than you are currently getting now.
Yes you must re-gear both axles on a 4WD.
4.10 would be correct for your current tire size. But... if you are thinking about going larger (ie 37) in the future then think about 4.56 gears instead.
MPG should be about the same or a little higher than you are currently getting now.
Yes you must re-gear both axles on a 4WD.
4.10 would be correct for your current tire size. But... if you are thinking about going larger (ie 37) in the future then think about 4.56 gears instead.
If I decide to do 37s couple years down the road I won't mind paying to regear.. But I feel now I need to..
Thread Starter
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Postmaster
Joined: Apr 2006
Posts: 3,294
Likes: 1
From: Neptune Beach, FL
I just need Ring and Pinon right? I have found something called Yukon 4.10 for 10.25 Rearend 31 Spline.. About $199 for it.. I'm no gear guy so I have't a clue what I'm looking for lol
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Storm,
Talk to the guys at "Randy's Ring & Pinon" that have alot of experience and good advice.
www.ringpinion.com/
Your truck has the following axles;
Front: Dana 60, 9.75" ring gear
1.3" Axle shaft diameter
30 Spline
2-pinion
Pinon Mounting - Above Center
Rear: Visteon, 10.5" ring gear
1.5" Axle shaft diamieter
35 Spline
3-pinion
Pinion Mounting - Overhung
Plan on spending about $500 on parts and about $800-1000 for install.
Talk to Randy's Ring & Pinon, they may also be able to refer you to a good shop in your area. You definitely want to find a shop with alot of experience re-gearing axles and with a good reputation.
You may want to ask down in the Texas section of the forum for recomendations on a good shop. Also call the guys at "Truck Toyz that did BearHunters truck and see who they recommend for axle work.
Talk to the guys at "Randy's Ring & Pinon" that have alot of experience and good advice.
www.ringpinion.com/
Your truck has the following axles;
Front: Dana 60, 9.75" ring gear
1.3" Axle shaft diameter
30 Spline
2-pinion
Pinon Mounting - Above Center
Rear: Visteon, 10.5" ring gear
1.5" Axle shaft diamieter
35 Spline
3-pinion
Pinion Mounting - Overhung
Plan on spending about $500 on parts and about $800-1000 for install.
Talk to Randy's Ring & Pinon, they may also be able to refer you to a good shop in your area. You definitely want to find a shop with alot of experience re-gearing axles and with a good reputation.
You may want to ask down in the Texas section of the forum for recomendations on a good shop. Also call the guys at "Truck Toyz that did BearHunters truck and see who they recommend for axle work.
Last edited by blackhat620; May 17, 2007 at 01:17 AM.
Elder User
Joined: May 2006
Posts: 593
Likes: 1
Storm beware, you will easily drop $2500+ on a gear swap for both axles. I checked into it and NO ONE and I mean -NO ONE- would offer a warranty as soon as I drove off the property. With a diesel I don't know if I'd swap gears, a gasser... sure... but the diesel is gonna be ok... you'll need ring, pinion, a different carrier if you go to 4.56's, the shim kit, bearing kit... parts will run you about $6-900 depending on brand. Auburn/Yukon make tough sets of gears, however.
Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
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Senior User
Joined: Feb 2002
Posts: 208
Likes: 0
From: Stockton USA
Look up 'West Coast Differentials' in Sacramento, CA...just put 4.56 gears in my 99 F350 yesterday.
You don't need a new carrier from 3.73 to 4.56 gears.
I had them do the labor - one day service.
Gears and labor was quoted @ about $1200 (about $1300 w/sales tax OTD) using your old bearings, but with new seals.
I had a new Tru-Trac LS diff put in the rear, which pushed the quote up to about $1800 +...plus Sales tax...about $1925 OTD.
When torn down, my rear bearings were pitted (175K miles) due to mileage, so I needed a bearing kit, and add'l labor for the set-up of the bearings...came to about $2350 out the door with sales tax.
So you can see about what you'll have to pay in the real world...I got a quote from 4Wheel Parts, and they were about the same, but I don't think they're as experienced as the shops that just do gears...IMHO
Had them put on my new 08 Ford alum Diff cover to finish off the job...cooooool!
click on image to enlarge
You don't need a new carrier from 3.73 to 4.56 gears.
I had them do the labor - one day service.
Gears and labor was quoted @ about $1200 (about $1300 w/sales tax OTD) using your old bearings, but with new seals.
I had a new Tru-Trac LS diff put in the rear, which pushed the quote up to about $1800 +...plus Sales tax...about $1925 OTD.
When torn down, my rear bearings were pitted (175K miles) due to mileage, so I needed a bearing kit, and add'l labor for the set-up of the bearings...came to about $2350 out the door with sales tax.
So you can see about what you'll have to pay in the real world...I got a quote from 4Wheel Parts, and they were about the same, but I don't think they're as experienced as the shops that just do gears...IMHO
Had them put on my new 08 Ford alum Diff cover to finish off the job...cooooool!
click on image to enlarge
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Postmaster
Joined: Dec 2003
Posts: 4,196
Likes: 10
From: Arizona
Originally Posted by blackhat620
Storm,
Mis-typed Front axle Ring gear, should be 9.00-inch.
Mis-typed Front axle Ring gear, should be 9.00-inch.
i was tired last night. 
My original post of ring gear sizes was correct. Dana 60 axles have 9.75" ring gears.
Elder User
Joined: Feb 2003
Posts: 895
Likes: 0
From: missoula montana
Originally Posted by sglynx1
Storm beware, you will easily drop $2500+ on a gear swap for both axles. I checked into it and NO ONE and I mean -NO ONE- would offer a warranty as soon as I drove off the property. With a diesel I don't know if I'd swap gears, a gasser... sure... but the diesel is gonna be ok... you'll need ring, pinion, a different carrier if you go to 4.56's, the shim kit, bearing kit... parts will run you about $6-900 depending on brand. Auburn/Yukon make tough sets of gears, however.
Elder User
Joined: May 2006
Posts: 593
Likes: 1
Well I'm certainly gettin jacked here in B-ham, because I can't find a 4x4 gear swap to 4.56's for under $2500, and they say as soon as you drive off the property, it's NOT warrantied, unless it breaks on the property before you drive off. This is from 4 places too...
Post Fiend
Joined: Dec 2002
Posts: 6,245
Likes: 1
From: IL, USA
Yeah, gear swap should be $1600-1800 tops for a quality gear set (Precision Gear is my brand of choice) and master install kits along with gear oil.
Now, for a LSD or locker..that would be more, but not much more if any on labor.
It's important to follow the recommended gear break-in procedure as well.
I don't know why they wouldn't offer any warranty.....although I know a lot of shops around here won't even touch diffs.
Now, for a LSD or locker..that would be more, but not much more if any on labor.
It's important to follow the recommended gear break-in procedure as well.
I don't know why they wouldn't offer any warranty.....although I know a lot of shops around here won't even touch diffs.
Lead Driver
Joined: May 2007
Posts: 5,613
Likes: 9
From: Flagstaff, Arizona
Hey Storm....I have 3:73 gears on my 7.3L with a superchip powerprogrammer. No problems when towing the boat which is approx. 8000 lbs. I just turn down the superchip to only a 60hp gain when towing. Empty I get 18-19mpg hwy, 13-14mpg city. Towing I get around 11-12 I think??? Been awhile.....man I gotta hit the lake!!! Oh yea....I used to have a 97 F250 with the 7.3L, with 4:10 gears, did okay even with the 35's, but not as strong at the 2000 7.3 even with 3:73's! I'd use the money for something else if I was you.....
FTE Leadership Emeritus
Joined: Sep 2003
Posts: 12,246
Likes: 761
From: Houston, Texas
I have 3.73 gears, 35 inch BFGs, and an SCT tuner and I feel like I should go with 4.10s for my truck. Every shop I spoke to suggested 4.10s as they would get me back to stock and then some. I.e. I'd be running lower RPMs on the freeway and around town, so better fuel economy. I went from around 18-19 mpg to about 15-16 mpg with the lift and my BFGs. So unless there's a better way to get my trucks speedo and power back to normal, a regear is in my future.