kwhite1109

Pretty new to the forum but I have been on here a lot doing research about everything and anything. The search function has been great and I have gained a fair amount of knowledge about re-gearing my truck from the current 3.31 (8.8HD) that my truck came with.

My current setup is in my signature but I have the 5.0 and I am running a level kit with 35x11.50r20 Ridge Grapplers. With all the calculations I have ran it seems that the 4.09/4.10 (FRPP/OEM) would be a great choice for daily driving and would put the effective ratio pretty close to what it would have been if I had the 3.73 with stock 32's. I plan on getting a TT for the family trips and figure that this ratio choice would also be good for towing with the larger 35's (although I know 4.56 would be the choice of many on here but that is not available for my rear diff).

I have received some good feedback from other members on this set-up and I guess I may be overthinking this (a lot) but are there any factors to consider that I have not already thought of? Is there a reason I should not do the swap and/or go with 3.73 instead?

SilverSurfer15

No. I would recommend 4.10s over 4.56 also. The truck has enough power to utilize 4.10s, you arent going to be towing in 6th anyways (you shouldnt be) so it will be a good setup. You dont need 4.56s for this scenario, they wouldnt be "bad" but your rolling resistance isnt increased nearly as much as say a 6-8" lift with 20x12s and 35s. Also, you will love it when its done. If your questioning the cost, dont. Everyone says that until they actually do it and then they realize....

I wouldnt even consider the 3.73s at this point. 4.10 is the right spot. FWIW, I'ved owned a half dozen or so trucks on 35-40s as daily drivers and regeared them all. I have a little experience here.

kwhite1109

I appreciate the feedback. I read many threads about 4.56's and 3.73's so thank you for reinforcing my decision about the 4.10's. I have had quite a few lifted trucks but I have never ventured into this department. I was hesitant about the cost but I said screw it and made the appointment. I got about five quotes from the surrounding area and decided on a place that wasn't the cheapest but has the best reputation and stands by their work. Gears going in Friday so we will see!

dman2708

Do you mind sharing how much will that cost you and are you going to run a tune?

kwhite1109

Not sure what the exact price will be when all said and done. Originally I was quoted $1850 with OEM 3.73's. I changed my order to 4.09/4.10's and was told that would add about $150 so about $2000 all together. I will report back when I get it done.

I am not planning to run a tune at this time. I just received the Hypertech Speedo calibrator but that is the farthest I will go till my warranty is up. I only have 5k miles on the truck now.

SilverSurfer15

thats about right, unfortunately the parts costs has SKY ROCKETED from where they were in 2000s. Its varies depending on if you need to change carriers and what not, a good rule of thumb is about ~1k per axle parts and labor for someone using quality parts and doing the job correctly, its not hard but its tedious depending on the axle.

When i was in college i worked a mostly jeep offroad shop, lots of gear installs... even then, we were charging ~1200 when parts were at least 50% less.

Newfordguy29

I could be wrong but I'm in the process of doing the same and I heard they don't make aftermarket gears for the 8.8hd, just oem 3.73 but I'd love to find out if I can put 4.10s in it for sure lol

tmcolegr

You're incorrect...


https://www.f150forum.com/f118/ford-...-ratio-383721/

rts9364

I want to do the same. I'm leveled with 295/60 Ridge Grapplers and I'm ready to make more power with the 5.0, but the truck needs more gear eventually, i.e., now.

Is there an easy way to ID which rear end i have? I didn't see a tag on the cover like the old days. I have a 2017 Lariat FX4 3.55.

Have you identified part numbers for the Ford 4.10 kits?

Also, what's the deal with the e-locking feature? Does that affect the swap at all? I'm not familiar with how that works, mechanically.

Not trying to hijack your thread, but if you can't tell I fully support your move to 4.10s!

kwhite1109

Here is a good thread with pictures and information on how to identify what rear end you have.

https://www.f150forum.com/f118/gear-ratio-change-3-31-3-73-5-0l-fx4-347749/index5/

The electronic locking rear will not have any impact on the swap. You are only changing out the ring and pinion as well as the bushings/bearings associated with those parts.

I do not have the parts list as the shop I went through ordered everything ahead of installation but I may get a parts list today when I pick it up.