Hello,

I already installed a 1993 stirling 10.25" axle in the rear, including the donor truck's rear Anti-Sway Bar setup (The F150 already had the frame holes for the hardware in the right place)

All the cables and lines hooked up perfect, and the leaf spring pads even had the correct hole locations for alignment.

What I am wondering is what the correct length should be for the required drive shaft???

I have Googled, and searched a few places, but can't find the numbers anywhere.

My other issue is the front end... the donor truck was 4x4, and we all know the frame is different where the front shackles would mount, especially because my F150 has been 2WD from day one.

Thanks to this I acquired a 2WD front end from a 1979 F250, everything not attached to the frame, plus the steering box.

I was aware that the spindles have the steering bars on the wrong side (rear) and my steering box expects the hardware up front of the axle....

Is there a way to swap just the discs and maybe turn them down to the F150 diameter?

Or can I swap spindles at the king pins, with new bushings, and operate them that way? (using all of the I-Beams, Radius Arms, and Springs from the donor F250? (I'd use my F150 steering box and steering bars out to the ball joints, and yes, a fresh alignment)

I am trying to keep cost down as low as possible, and have sourced all parts so far as free.

I understand the king pin bushings will cost real cash, and I have it, but I am hoping someone has done a swap like this before.

I'd rather go this last route, if it works, to raise the front of the vehicle back to or somewhat over stock height, since the 4.9L has really sagged the front end at least 2-3 inches since 1994.

Thanks for any advice or information you may provide me.

I need to move ASAP and need to be able to drive it quickly, even if all I do for now is learn what the correct driveline length is supposed to be for an early 90's 4.9L M5OD based F250 with a 7 foot 2 inch bed and standard cab.

I hope someone can help, even if it's just the driveline length, so I know what to ask the wrecking yard before driving a borrowed truck 160 miles round trip for nothing.

Where I live in Pahrump, NV to the center of Las Vegas, NV is roughly 80 miles each way, at 12MPG for the borrowed truck, so I need to be certain I am getting the right part before I go so far.

Some of you guys are awesome, and so is this site!

Looking forward to an answer I can live, and drive with...

Eric

 

Please accept my apologies for not posting a fresh thread in the first place.

I know this is the better/accepted way to post questions on most forums when the questions are not exactly the same.

I'd still like to know how long, overall, the single piece driveline is on a shortbed (7'2") 1990's F250 2WD with a 300 I6 and M5OD and Stirling 10.25 axle... from end to end, minus the U-joints and fore and aft yokes removed...

What I seem to see, in a roundabout way, on one site I visited, is 'about 3" shorter than the stock F150 driveline ' for 90's 8.8 to 10.25 swaps, but that is not a solid number, like a factory driveline would be.

I don't have the resources to guess, buy something close, only to have it damage my transmission or itself...

I know the hardest part is I went ahead and kept the factory lift blocks with raised bump stops from the 4x4 F250 axle, figuring using the 460 F250 springs would lift my light inline 6 front end substantially.

But 2" blocks should not add more length to the configuration than a fraction of an inch, given the length to lift ratio.

Any help would be appreciated.

Thanks,
eric

EDIT: Hard to believe nobody knows the stock length for a driveline. I guess I could ask someone with one at a parts store if they mind if I crawl under and measure theirs.

I had hoped someone here would know or be able to measure a spare or something.

I'll hold out bothering a stranger locally, in hopes one of you here has the answer.