HELP! Usable rear axle question. :)
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Cargo Master
Joined: Apr 2001
Posts: 2,220
Likes: 26
HELP! Usable rear axle question. :)
Here's a fun one:
My friend has a 1992 F150 (4.9 manual) whose rear end needs replacing. I don't have the truck in hand to measure the rear axle.
He needs it for a delivery route, so we want to swap rears this weekend, problem being I don't have a matching rear axle and he is nearly broke.
I have theses truck rears:
'73-79 9", a 1968 9", a 1997 F150 8.8", and a 1990 F250 (we don't mind using an 8-lug rear if we have to).
Which of these is a direct bolt on/easy bolt-on? I can fab brackets and spring pads if required, but speed matters since I have basically one day to do it.
What says the FTE hive mind?
My friend has a 1992 F150 (4.9 manual) whose rear end needs replacing. I don't have the truck in hand to measure the rear axle.
He needs it for a delivery route, so we want to swap rears this weekend, problem being I don't have a matching rear axle and he is nearly broke.
I have theses truck rears:
'73-79 9", a 1968 9", a 1997 F150 8.8", and a 1990 F250 (we don't mind using an 8-lug rear if we have to).
Which of these is a direct bolt on/easy bolt-on? I can fab brackets and spring pads if required, but speed matters since I have basically one day to do it.
What says the FTE hive mind?
Senior User
Joined: Jul 2005
Posts: 347
Likes: 0
From: USCGC Never Home
The 10.25 from the F250 would be easiest to bolt in, but I think you will run in to some drive line issues. I think the pinion is longer on the 3/4 stuff so your drive shaft will be to long. And you will need to use a combo U-joint to fit the half ton shaft to the 3/4 ton diff, possible for you to have vibrations after this though.
Cargo Master
Joined: Jan 2004
Posts: 2,512
Likes: 8
From: Cook Forest and Irwin PA
IIRC, the frame width for the late 70's might be the same as the 92. therefore, the spring perches might be the same distance. get out a tape...the 9" has a shorter nose so make sure you have enuf drive shaft to get a good bite on the slip yoke.... (I happen to have 1 shaft left in stock btw that will work if you are 2wd)
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Senior User
Joined: Jul 2005
Posts: 347
Likes: 0
From: USCGC Never Home
IIRC, the frame width for the late 70's might be the same as the 92. therefore, the spring perches might be the same distance. get out a tape...the 9" has a shorter nose so make sure you have enuf drive shaft to get a good bite on the slip yoke.... (I happen to have 1 shaft left in stock btw that will work if you are 2wd)
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Thread Starter
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Cargo Master
Joined: Apr 2001
Posts: 2,220
Likes: 26
Good point on the '92 frame width.
I forgot that years ago I did a swap on a '78 beater where I installed a SRW
Dana 60 out of a ninety-something donor. The perches and shock mounts lined up fine and the stock drive shaft out of the '78 was long enough.
I forgot that years ago I did a swap on a '78 beater where I installed a SRW
Dana 60 out of a ninety-something donor. The perches and shock mounts lined up fine and the stock drive shaft out of the '78 was long enough.
