Truck Differential Question

DRussell · Mar 23, 2021

I have a 2WD 2000 F550 with a Dana/Spicer 135 rear end axle with 4.88 ratio. I want to change to a steeper ratio differential and found a Dana S110 out of a 2011 F450 with 4.11 ratio. I was told the center section would interchange on them, but they will not interchange, the S110 is a 12 bolt center section and the S135 is a 14 bolt pattern.

So, the plan is to change the entire rear axle rather than just swapping the center section. The problem is the S110 has 10 bolt wheels and the S135 has 8 bolt wheels. I could get 10 bolt wheels for the new axle, but my mechanic thinks he can swap the hub/brake assembly on the axles and use my 8 bolt wheels on the S110 axle. He looked up the wheel bearing numbers for each axle and according to Napa they both use the same bearings.

Does anyone here know if the rotor assemblies and hubs will exchange between these axles?

used red MN · Mar 23, 2021

Cant help you with your interchange question but I can help you correct your terminology. The term you are using for the ratio move you are making is not correct. You are decreasing the driveline to axle ratio, the correct term to use is ..shorter.. gearing. I would refer to it as higher gears, as in you shift to a higher gear to reduce engine rpm. Moving from a 4.88 to a 5.12 is moving to a steeper ratio. To confuse things more taller and steeper gears also mean the same thing.

DRussell · Mar 23, 2021

Thanks, there's never a guarantee that I use the correct terminology.

MarkB_MI · Mar 23, 2021

That sounds like a lot of aggravation. Why not replace the ring and pinion set, and replace the bearings while you're at it? And you might want to install a locking differential if the truck doesn't already have one. It won't be cheap, but it will be right (if your mechanic knows what he's doing).

Denny K · Mar 23, 2021

On the first late model race car I worked on with a quick change rearend, I was taught the terminology deeper and wider. 4.88 to
4.11 is wider and 4.11 to 4.88 is deeper. Made sense to me.

rustred · Mar 23, 2021

i would just change the crown and pinion along with brgs. plus need to check on the carrier if it is the same. but not very many mechanic's nowadays are experienced in setting them back up. as for ratio's they are called higher or lower ratio's. the higher the ratio number the lower the gearing, the lower the number the higher the gearing, which is a higher ratio. thought maybe you had a steep mountain to climb, lol. and for an in stone answer best to go visit your ford dealer.

Hobo,NC · Mar 23, 2021

You may find some help from these folks. Their top gun was out last week give them a call it cost nuttin... Sometimes a gal answers her name is Sherrill she will tell ya she's not very knowledgeable but she is.

https://venturestruckparts.com/

buickanddeere · Mar 23, 2021

That would take cruise rpm from 2500 down to 2100.

DRussell · Mar 23, 2021

To go from 4.88 to 4.11 in the 135 axle requires a new carrier, I looked into the ring gear, pinion and carrier route. I was told parts are 3500 or more, labor would be on top of that..way more than the S110 axle.

DRussell · Mar 23, 2021

At 65 my rpm should be 1950 rpm.

DRussell · Mar 23, 2021

Thanks, I'll talk to them tomorrow.

Truck Differential Question

DRussell

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used red MN

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DRussell

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MarkB_MI

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Denny K

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rustred

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Hobo,NC

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buickanddeere

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DRussell

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DRussell

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DRussell

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