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Old 05-29-2013, 05:57 PM   #1
Ol' Chevy
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Location: Elma, WA
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'68 Chevy 4x4 Axle Swap

I'm getting ready to swap out the original axles under my pickup for a Dana 60 (rear) and a Dana 44 (front). Currently the rig has 4.56:1 gears in it. The Dana 60 I'm buying has 4.10's, and I think I have a lead on a Dana 44 with 4.10's. I'm expecting a little quieter ride, and hoping for a boost in gas mileage. Is anyone running 4.10's with stock tires, and if so, would you reccomend that gear ratio, or would I get significantly better gas mileage with 3.73 gears? The reason behind the 4.10's is mostly availability. No yards around here have 3/4 ton diff's with 3.73's
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Old 05-29-2013, 08:59 PM   #2
20' Daredevil (Ret)
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Re: '68 Chevy 4x4 Axle Swap

Welcome from NorCal!

I have 4.10s in my '72 K20, with 33/12.50-16.5s that are just a tick taller than the original 7.50-16s. It's OK on secondary roads at 55 mph but you don't really want to go much faster... 70 on the freeway is pushing it pretty hard. Depends on how you'll be using the truck but if it sees a lot of highway miles I'd try for taller gears, taller tires, or an overdrive unit or overdrive tranny. 4.10s are great for a workhorse that doesn't spend much time on the open road, especially freeways.
- Mike -

1972 K20 LWB 350/350/205

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Old 05-30-2013, 11:34 AM   #3
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Re: '68 Chevy 4x4 Axle Swap

use this as a handy tool to figure out how much it's going to change for you.

4.10's will definitely be better than 4.56, but if you do more driving than hauling i'd recommend 3.73's or 3.55's.

some of it depends on the intended use of the truck and what engine/transmission you have. my 4x4 is going to have 3.73 gears with 35" tires, which is equivalent to 3.23's with stock tires. I have a 383 small block that has a very usable power band though and i'm not planning on pulling anything with it.
-- Josh

OLD SKOOL-- 1970 C10. 5.3/Th400/3.73s & spartan locker
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FARM TRUCK----1949 Chevrolet 3800 stakebed--inherited farm truck
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Old 06-03-2013, 12:41 PM   #4
Ol' Chevy
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Re: '68 Chevy 4x4 Axle Swap

Thanks for the info. I do most on my driving on county roads or highways, usually from 45-60 MPH. I want to be able to haul a cord of wood or a camper, but I also want to be able to take said camper to Idaho or Montana without breaking the bank. I picked up a Dana 60 with 4.10's the other day. If I can find a Dana 44 front with 3.73's I'll regear the rear to match, otherwise I'll probably just stay with the 4.10's.
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