looking for 3/4 ton diffs for swap

[hilljob26]

well,i think i am going to swap my half ton to a 3/4,but i need a good front diff w/ disc brakes and a good rear,i would prefer 3.73 or 4.10 gears,i guess maybe a dana 44 for the front and a 14 bolt for the rear,i dont know a whole lot about the 3/4 ton axles,but i guess its time to learn,if somebody close has some,let me know..mike

[67-72williso]

For the front just use the Dana 44 and the gears you already have. All you need to change there is the hubs, rotors & lockouts. The rear you need to get an 8 lug full float to match your front gears. Hope this helps.
Later Willis

[hilljob26]

really,the front dana's are the same on 1/2 and 3/4

[Southedisto]

The fronts are the same out to the knuckles. Some of the spindles are different, I think the early 70's were different. Someone will post for sure though.

[86k10]

I have a front D44 out of a 75 GMC K20 that's geared 4.10 and maybe a 14 bolt rear too.

[hilljob26]

really,what would you want for them,how far is that from say holdredge nebraska,i have family there

[hilljob26]

do you know what that 14 bolt is geared at

[krue]

No buying and selling here, I'm gonna move this.

[86k10]

Bertrand is 15 miles west of Holdrege so I'm not to far away. The 14 bolt is 4.10 and has a factory posi. In fact it is in a truck I am driving now, I would like to change it to 4.56 I'll have to look over the D44 and make sure there is nothing majorly wrong with it and then i'll give you an estimate.

[full foot notch]

PM me, i have 8 lug outers already pulled

[teeitup]

Mike I just posted some for sale on parts board, Thanks Randy

[1967k30]

I have a D44/14bolt combo w/ 4.10's for $450obo. Out of a 76' K20.I'm in NE as well.

[4x4Poet]

Front: What's been said about swapping in 3/4 ton stuff from the spindle out. I forget if the caliper brackets must also be swapped out.
Another upgrade is to install superior, 73up inner axles at the same time since they don't neck down as much and use a Spicer 760x joint (replacement for the old 297x) that is beefier than the original '72 260x joint. Consider alloy axles if the budget allows. Inner and stub Yukon 4340 axles can be had for both sides thru ringpinion.com/ for ~$450 with 760x joints plus shipping. Only absolutely necessary with a locker, IMO. Superior makes bling bling versions for much bigger bucks.

Rear: AFAIK, only 77up 1-ton GM trucks had SRW 14bFFs with the axle perches spaced to match 67-72s. I'm pretty sure that any other 14bFF must have its spring perches relocated to match the spring width of your '72 K10. No biggie if you can do it yourself or get the axle cheap so as to leave budgetary room for the short fab work. Proper angle is as important as width to stave of any castor-induced driveline vibration.

A cheaper option might be to source an Eaton H052 rear axle with 4.11 gears. It would also be light weight to retain a desent ride. Many 67-72 truck owners notice a tad more ride harshness once they install a 14bFF over an Eaton H052 or the 12-bolt. With either the Eaton or 14bFF, changing to disc brakes helps reduce the weight for a better ride, not to mention better stopping and easier maintenance (pad or caliper R&R).