Eaton HO72 with 14 bolt carrier?

[MrBeast]

Hey everyone, I have heard around that you can install a 14 bolt carrier/ring and pinion setup into your HO72 housing, using a new locker and all that jazz, making parts easier to find, anyone have the info on what is required to do so?

Any help here would be greatly appreciated, my 4.56 gears are killing my fuel economy!

[1969 GMC]

I'm pretty sure you can't fit a 14 bolt carrier in an Eaton axle, but you can fit a 14 bolt Detroit locker or minispool into the Eaton carrier if you use the corresponding 14 bolt axleshafts.

Not to nitpick, but I don't think it's the 4.57 gears killing your economy...it isn't a Geo Metro. It's a drw one ton truck.

[MrBeast]

Originally Posted by 1969 GMC

I'm pretty sure you can't fit a 14 bolt carrier in an Eaton axle, but you can fit a 14 bolt Detroit locker or minispool into the Eaton carrier if you use the corresponding 14 bolt axleshafts.

Not to nitpick, but I don't think it's the 4.57 gears killing your economy...it isn't a Geo Metro. It's a drw one ton truck.

Well what I am looking at is my old 97 GMC K2500HD had a 454 in it, and a 4L80E and it would pull 15-16 on the interstate. It was a 4x4, but it was also fuel injected. I am planning on either fuel injecting the truck, or putting a Diesel in it.

[special-K]

^O/D is the key.^
If you want a higher gear,why not swap a complete 14-bolt rear axle?You can buy one for what a gear set,bearings,and seals would cost.

[MrBeast]

Originally Posted by special-K

^O/D is the key.^
If you want a higher gear,why not swap a complete 14-bolt rear axle?You can buy one for what a gear set,bearings,and seals would cost.

Because my truck is a dually and for the moment I don't want to make it any wider because it will mean having to build a new body for the back or narrowing a 14 bolt down. Either way I would be looking at a lot of work. If I put a 14 bolt carrier in my HO72, it will allow me to keep my rearend width and still upgrade my gears.

[Chris H]

Originally Posted by MrBeast

Because my truck is a dually and for the moment I don't want to make it any wider because it will mean having to build a new body for the back or narrowing a 14 bolt down. Either way I would be looking at a lot of work. If I put a 14 bolt carrier in my HO72, it will allow me to keep my rearend width and still upgrade my gears.

You can put a complete 14b rear end in, they were made in 2 basic widths for duallys. There is the dually pickup width (too wide for your rig) and the narrower cab & chassis width. You have a whole new world of gear ratios available, as well as easier access to brake parts and such. I have been holding on to a 3.73 dually rear from a 1987 cab/chassis for my 72 C30. It looks to me like the spring perches are the right width, you will need to fab some shock mounts.

I dont think the whole 14 bolt carrier bolts in to the Eaton? I think what people are doing is putting the locker from a 14b into the eaton by using the 14b axle shafts, and I think the only reason for that is that the Eaton locker is not available new anymore. Would be very nice if we could use the gear sets from the 14 bolt!!! Lots of ratios available there.

Keep us posted with what you come up with, and keep up the good work on that cool rig of yours!