ok guy loong time since i have been on here getting back to working on my truck and am wondering will a f-250 ttb diff assembly (just the guts) swap into my axle on my f-150

2nd question will 4:10 's out of a ford 9" fit in a ford 8.8

have 3:55's and 4:10's will do the trick

basicly i need lower gearing due to larger tires and want to know if there is a cheaper way with alkittle more work then just buying the gears new

 

Any other ideas?

 

Are you sure about that? I though I read that the D44HD and D44 shared the same pumpkin... but I could be mistaken.

 

The 9" gear set has a 9" diameter ring gear, while the 8.8" gear set has a 8.8" diameter ring gear. The differentials are different sizes. That is the most obvious reason that swap won't work.

Simply swapping in a different set of gears is not that easy anyway. You have to set pinion depth using shims (front to back in the housing) just right and shim the differential just right (left to right) for the correct pattern. Then set the pinion bearing preload correctly. If you have the time to learn and trust your capabilities, I encourage you to do it. You could replace all your seals and bearings so you'd have a very dependable axle set, that you know should last a good while. Not that many people are meticulous enough, this is not a job where "ah f-it, its good enough" will cut it.

I'm not sure on the Dana 44 HD gears working with the Dana 44, though I suspect they'd work.

Alot of guys on here just swap whole rear axles to change ratios as they would prefer to just cut some U-bolts, unbolt the shocks, and disconnect the brake lines then use a JY axle with 4.10's in it already.
As for the front, you could pick up a 3rd member thats already equipped with 4.10's (probably also from a JY) and put it in. That would require pulling the front axle shafts, removing the front driveshaft, and unbolting your current 3rd member.

 

first what size tires are you running. what motor and tranny is in the F150?

this will help us give you the proper gearing suggestions.

 

truck is a 1993 f-150 rag cab long box , 8.8/355/ls raer end , 351 /e40d/1356

going to run 37-38 inch tires so 488-513 gears
i am confident as a mechanic have turned wreches for years so shiming and chacking lash is no problem and i never use the it will be fine mentality ,since i started cleaning and prepping the frame for paint i have discovered i have OCD hahaha cant settle for good enough



as for what the truck will be whenn done ... will be used for some light wheeling nothing crazy

351 has headers and k&N fipk,will getan electric fan
e40d is getting new performance converter (havent decided on what)
also will be getting a shift kit or thans controller dont know what , need some input on this
rebuilding BW 1356 as we speak(mechanical shift)
has BDS 6" lift in it that i am converting to 8" with skyjacker parts and a shackle flip in the rear with ladder bars + 3" cough cough body lift cough cough

swaping bench seat for a set of buckets and consol out of a 97 150
bushwacker flares

lund moon visor and roll pan
wite paint with black wheels when done

so thats the plan so far

about half way done now

any input is very much appreciated thank Ian

 

The answer is "yes". Either the D44HD or the D50 differential would fit right in to your F150 D44 axle arm. I know: I have had one under my F350 for almost 15,000 miles. D44 & D44HD both use a 9" ring gear while the D50 uses a 9.75" ring gear. Axle sizes, spline counts, and the critical dimensions are all the same so it is a virtual bolt-in upgrade. Just be sure (as always) that your front & rear axle ratios match.

dn.