5.0bronco
Full Access Member
im thinking about swaping out the 4.10 gears in my crew cab to 3.55 and i was wondering if anyone had an esinmate on how much low end power loss i would see?
4.10 to 3.55 swap?
- Thread starter 5.0bronco
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5.0bronco
Full Access Member
was your idi with 3.55 gears an automatic or manual?
Goofyexponent
Mentally Unstable..
I went the other way and noticed quite a difference in power.......and a loss in mileage.
I am going back to 3.55's next month!
I am going back to 3.55's next month!
turbodiesel94
Full Access Member
I have an auto with 3.55s and I hate it living in the mountains, I would take 4.10's anyday.
itsacrazyasian
residentcrazyasian
you're gonna get different opinions from diffrent people who use their trucks differently and with different setups. My truck HAD 3.55's but it was a gas c6 truck origionally and the dana 60 front axle i got has 4.10's so i swapped the donor rear axle in too. I like the 4.10's much more but i'm on 35's gonna be on 37's soon.
mabc926
Mojo
3:55 = Good for driving on the interstate, and cruising around.
4:10 = Good for towing/pulling heavy loads.
Which one do you do most?
4:10 = Good for towing/pulling heavy loads.
Which one do you do most?
Man I hated my 3.55's. Combined with a worn out N/A 6.9 it really disliked pulling any grade in higher altitude. On the flip side I don't think I would have liked 4.10 and no overdrive either 
Either way I'd make sure you have an overdrive trans before you go the route of a gear swap. I have 4.10's behind a ZF5 and 255/85 tires and I think it is geared just right.
If you do the swap just find replacement axles they are much cheaper than buying and setting up gears
Either way I'd make sure you have an overdrive trans before you go the route of a gear swap. I have 4.10's behind a ZF5 and 255/85 tires and I think it is geared just right. If you do the swap just find replacement axles they are much cheaper than buying and setting up gears
5.0bronco
Full Access Member
mostly highway and crusing around but i do pull my mud truck and an excavator from time to time
mabc926
Mojo
forcefed
Full Access Member
I had 4:10 and switched to 3:55's and like those much better. My fuel mileage incresed from maybe 13-14 to 17-18mpg. I still tow my trencher around and it weighs around 6500lbs plus trailer weight. So I did not lose alot in towing for what i do but I have no mountains either. I have a 5 speed and a only running 33" tires so that is a factor too if you have bigger tires. Its all in what you want, more towing capabilities or lower rpms at cruising speed.
I switched to 3.55s in my 94, lost some pulling power but so much nicer to drive. Then I installed a Moose Pump, it felt like a 4.10 truck again and then some!!! I hope to be adding an intercooler soon, so It should be even better
, it felt like a 4.10 truck again and then some!!! I hope to be adding an intercooler soon, so It should be even better
MidnightBlade
Shiftin' Smooth
i am hoping to do 3.73's along with a D60 swap. that will be a long way down the road
I have a cc Dually with a N/A 6.9 with a T-19. The 4.10 pinion gear decided to let loose (common with short Pinion) So I installed a new set of 3.55's, all I can say is,it was the best thing I could have done. The Truck drives so much nicer now! I have an S-47 with the 5.08 1st gear I plan in installing. I Tow a 28 ft in closed car trailer,about 15k. I plan on a Turbo and if I can find a Browning,I will be set for anything! I will never go back to 4.10's again. Just me.
Shadetreemechanic
Full Access Member
My $.02. I have towed heavy with both gears. The only time you will miss the 4.10s is with a heavy load starting out on a hill with the zf. I usually use low range to get myself going in that situation. Otherwise you don't notice the difference unless you put alot of stock in what gear you are in. I do gear down more with 3.55s, but my speed is the same.
