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Old Yesterday, 07:44 PM   #1
sub3
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Drive shaft legnthening

Hello! Just took my bronco for the first drive after complete rebuild w/2.5" suspension lift. Had some mad vibration under acceleration, because i'm an amateur I thought I could get by without lengthening the driveshaft but after looking more closely, I think its necessary. See picture

Is it as simple as cut it in half, figure out the tube size and thickness, order tube, cut off the ends of the driveshaft, weld in new tube at longer length? (In my case I think I need about 4") then paint and install?
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Old Yesterday, 07:51 PM   #2
DirtDonk
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Are you sure that's not the front shaft? You should never see that much extension for just a 2.5" lift.
I have a 3.5" lift and a stock shaft measures out perfectly.

The rear pinion angle is an important factor in driveshaft length too though, so don't measure for fitment until you are sure the angle is dialed in.
Basically you want the pinion pointing up into the drivesahft, about 1-2 degrees below the centerline.

Good luck.

Paul

'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"

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Old Yesterday, 07:52 PM   #3
DirtDonk
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Sorry, should have looked at the pic closer. Your angle looks pretty much perfect from here, so I guess it's longer shaft time.

Just to be sure though, you should measure between the top of the axle tube and the bottom of the frame rail to make sure you're rocking 2.5" of lift at this point.
I know our springs sit high, especially in the beginning. And even have a problem sitting too high sometimes.
You'd be looking for approx 8 to 9 inches between the frame and axle.

Paul

'71 Wagon, 3.5" WH, F150 disc brakes and steering, 4.11 33x11.50 Thornbirds, Kayline soft top, Hanson bumpers. "Built, not bought"

'68 LUBR, 2.5 + 1 WH, 31x10.50, 4.56, Explorer and 4R70w by EFI Guy, WH disc brakes, Hanson front bumper, Warn winch. "Bought, not built"

www.wildhorses4x4.com
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Old Yesterday, 08:43 PM   #4
hammer189
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You can’t l lengthen a drive shaft yourself. It needs to be professionally done and balanced.

1976 Ranger. 1" BL, 2 1/2" WH lift, NV3550, 31" Tires
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Old Yesterday, 08:50 PM   #5
sykanr0ng
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You think you have vibration now, if you put an unbalanced driveshaft on it you will have a whole new definition of vibration.

... I've got skills, ingenuity and no regard for maintaining any kind of historical preservation or authenticity...My Dad called that sick and wrong
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Old Yesterday, 09:32 PM   #6
Master Chief
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Not to discredit any other manufacturer but Tom Wood's build awesome drive shafts. They even have free shipping! http://www.4xshaft.com/
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Old Yesterday, 09:43 PM   #7
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Quote:
Originally Posted by sykanr0ng View Post
You think you have vibration now, if you put an unbalanced driveshaft on it you will have a whole new definition of vibration.
So true. I did a quick shorten for a ranch truck that got a divorced transfer case just for extra gearing while pulling a water trailer. I was a little off, thought good enough for a farm truck that won't see over 10 MPH. That was optimistic, shake was bad at 10. Max shake free speed was 5 MPH.

The driveshaft shop trues them to a couple of thousandths of being true and spin balances them. A little tack weld holds a washer in place for the balance weight. They are pretty touchy about getting them right.

Also the welds need to be spot on. There is a lot of torque, and a lot of speed. If it comes apart it will often take out other stuff besides itself. Exhaust, floors, brake lines, tailhousings, fuel lines, electrical, yokes, etc.

"She's built like a steakhouse but she handles like a bistro"-Zapp Brannigan
“How hard can it be?”-Clarksonius 4th century BC.
Full throttle, it either solves the problem or ends the suspense.
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Old Today, 12:06 AM   #8
broncodriver99
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No.. Find a driveline shop.

'73 in progress. 302, 3 On the Floor, Stock HD Suspension, 31's, 4.11:1
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Old Today, 04:37 AM   #9
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Quote:
Originally Posted by Master Chief View Post
Not to discredit any other manufacturer but Tom Wood's build awesome drive shafts. They even have free shipping! http://www.4xshaft.com/
/\/\ ding ding

76 SPORT 351W C4 PDB
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Old Today, 05:46 AM   #10
sprdv1
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Quote:
Originally Posted by hammer189 View Post
You can’t l lengthen a drive shaft yourself. It needs to be professionally done and balanced.
agreed... better to just go w/one of our vendors in my opinion

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Old Today, 05:46 AM   #11
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Guess you better call the Whaaaambulance

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Quote:
Originally Posted by Master Chief View Post
Not to discredit any other manufacturer but Tom Wood's build awesome drive shafts. They even have free shipping! http://www.4xshaft.com/
yes sir..

I have one from TW for front and my hear is from Duffs..

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Old Today, 05:59 AM   #12
sub3
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Thanks for the help and i'll checkout 4xshaft.com! Next I need to stop being indecisive about my wheel options but thats a conversation for another thread
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Old Today, 08:39 AM   #13
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Nice Bronco worthy of a proper driveshaft.

1974, stock 302, C4, BFG KM2 33x12.5x15, 8in rim, detroit rear, trutrac front 4.11 gearing, Warflairs,2.5" lift, chevy disc conversion, Hydraboost, owned since Christmas Eve 1977
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Old Today, 02:34 PM   #14
sub3
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Long shaft measured and ordered. http://www.4xshaft.com/ ETA 1 week.
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Old Today, 03:08 PM   #15
bronkenn
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Quote:
Originally Posted by sub3 View Post
Thanks for the help and i'll checkout 4xshaft.com! Next I need to stop being indecisive about my wheel options but thats a conversation for another thread
Well I think it looks fine with that wheel/tire combo. Ken
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