Driveshaft question
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More Turbo
Joined: Mar 2012
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Driveshaft question
Hey guys,
I'm looking at another dent. It's mid way through a 6.9 diesel swap. It's a 79 F150 single cab, short bed 4x4. As of now the engine is in, but needs to be wired and needs fuel lines and such.
Anyways, my question is regarding the driveshafts. Behind the 6.9 is a 4 speed, which is obviously a different length than the C6 that was behind the 351 that was originally in the truck. Are there any drive shafts out there that will be a direct fit, or will I need to shorten the rear driveshaft and lengthen the front one? Also, any idea of how much a shop will charge to do this? The guy still has the F250 driveshafts, so if I get the truck I'll use those unless there's another driveshaft that would fit. I was thinking if I could find drive shafts out of a shortbed f150 with a 4 speed, but I doubt they would fit.
Thanks
I'm looking at another dent. It's mid way through a 6.9 diesel swap. It's a 79 F150 single cab, short bed 4x4. As of now the engine is in, but needs to be wired and needs fuel lines and such.
Anyways, my question is regarding the driveshafts. Behind the 6.9 is a 4 speed, which is obviously a different length than the C6 that was behind the 351 that was originally in the truck. Are there any drive shafts out there that will be a direct fit, or will I need to shorten the rear driveshaft and lengthen the front one? Also, any idea of how much a shop will charge to do this? The guy still has the F250 driveshafts, so if I get the truck I'll use those unless there's another driveshaft that would fit. I was thinking if I could find drive shafts out of a shortbed f150 with a 4 speed, but I doubt they would fit.
Thanks
Posting Guru
Joined: Sep 2009
Posts: 1,159
Likes: 1
From: Suburbs of Chicago
If you're going through the trouble of finishing someone elses swap you might as well put new driveshafts in it. They'll be balanced, and you'll be happier. my $0.02. As far as price, someone else will chime in/
Thread Starter
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More Turbo
Joined: Mar 2012
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Yeah I'd love new driveshafts but if I go with this truck I want to keep it as low budget as possible. But thanks, anyone else?
Elder User
Joined: Oct 2011
Posts: 842
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From: Palmyra
Use which ever two drive shafts are closest to what you need but yet to long & have them shortened. That's your cheapest route. Remember the 3/4 tom drive shafts will have the bigger U joints also on them so you'll need to deal with that as well. Bigger is better on that end.
Elder User
Joined: Oct 2009
Posts: 871
Likes: 1
From: New Albany, MS
I would say your best bet would be shortening the rear you have. You can probably find someone locally to do this for you. Any machine shop should be able to turn off a weld yoke and shorten it for you, heck I've seen it done with a grinder and a careful hand. They're a few tricks to setting up driveshafts at home, and there really not all that bad, if you have a welder and a few other tools.
You won't be able to lengthen the front shaft, unless you have both weld yokes cut off and you find or buy another longer tube to replace the shorter tube with, or find a whole 'nother driveshaft to cut down.
Driveshaft's can be done on the cheap, I built one for a guy the other night and I think including labor he had less than 100$ in it. Not to shabby for a perfect sized custom unit.
You won't be able to lengthen the front shaft, unless you have both weld yokes cut off and you find or buy another longer tube to replace the shorter tube with, or find a whole 'nother driveshaft to cut down.
Driveshaft's can be done on the cheap, I built one for a guy the other night and I think including labor he had less than 100$ in it. Not to shabby for a perfect sized custom unit.
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