2 piece vs 1 piece drive shaft - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 11-13-2007, 12:51 PM   #1 (permalink)
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2 piece vs 1 piece drive shaft

if i replace my drive shaft would it matter if i just had a one piece made up rather than the 2 piece and the carrier bearing?
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Old 11-13-2007, 01:47 PM   #2 (permalink)
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Re: 2 piece vs 1 piece drive shaft

If you have to replace it anyway go ahead as long as you have a short bed. If you have a long bed don't do a one piece! The driveline in a longbed has to be too long and the driveline itself will wobble. If you do have a shortbed get one made with a CV in it and a new slip and stub joint. Should be around $800-$900 at a good driveline shop. I have a one piece in mine.
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Old 11-13-2007, 03:37 PM   #3 (permalink)
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Re: 2 piece vs 1 piece drive shaft

Ford SuperDuties come with either a one-piece, two-piece, or three-piece driveshaft, depending on the wheelbase. If your truck came with a two-piece driveshaft, that's because the Ford driveline engineers determined a one-piece driveshaft would be too long between U-joints for your needs, a 3-piece driveshaft was overkill for your needs, and a two-piece drive shaft was just right.

Trying to be a driveline engineer when you're not qualified can lead to some real heartaches, headaches, and driveline vibration. But it's your truck and your money, so if you want to be an amateur driveline engineer, go ahead. [img]/forums/images/%%GRAEMLIN_URL%%/crazy.gif[/img]
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Old 11-13-2007, 10:55 PM   #4 (permalink)
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Re: 2 piece vs 1 piece drive shaft

i have heard mixed opinions on this before, i'd like to hear some more comments, this is something i have thought about before as well.
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Old 11-14-2007, 10:48 AM   #5 (permalink)
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Re: 2 piece vs 1 piece drive shaft

Not being a driveline engineer, I have determined the guy who did the SD's was not either. Take a look at what your center bearing is mounted on. A flimsy support that holds you fuel tank that can cause funky hamonics. I have fought with with truck to get the vibrations out and finally went to a one piece shaft and have not looked back. The two piece is a nightmare, especially when you go to rebuild. Find a good driveline shop and let them build one for you. It will be cheaper than rebuiling the stock one and balancing.
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Old 11-14-2007, 01:25 PM   #6 (permalink)
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Re: 2 piece vs 1 piece drive shaft

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tfdrooke24</div><div class="ubbcode-body">i have heard mixed opinions on this before, i'd like to hear some more comments, this is something i have thought about before as well. </div></div>

Rook,
Take your truck over to Drive Shafts Inc or Drive Train Specialists , both are in Tulsa and either shop will take good care of ya! To save you some money, when/if you swing by have em measure it up and give you a quote. Then at home you can pull the drive shaft(s), drop it off with them and pick it up/re-install when its done. Might be cheaper that way and pulling the drive line is purdy darn easy.... [img]/forums/images/%%GRAEMLIN_URL%%/wink.gif[/img]
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Old 11-16-2007, 01:35 PM   #7 (permalink)
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Re: 2 piece vs 1 piece drive shaft

chrisP, I had talked to a driveshaft place and the guy said alot of people switch to one pieces. I know you said that you like the one piece and you would never go back. Thats good and gives me a good feeling about that because my truck and your truck are exactly the same execpt mine has the lift. 156 wheel base is the same and everything. Im not going to be pulling heavy loads if I pull at all. Im leaning more towards getting it made, it'll be alot cheaper. thanks for the info
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1997 f250 7.3 XLT ext cab long bed 4x2 bone stock 167k and counting
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Old 11-17-2007, 01:40 PM   #8 (permalink)
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Re: 2 piece vs 1 piece drive shaft

looks like be having a one piece shaft after thanksgiving, should i reuse my flanges? or get everything new
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Old 11-17-2007, 02:26 PM   #9 (permalink)
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Re: 2 piece vs 1 piece drive shaft

Mine has a 2 piece and if you plan on doing any kind of lifting of the truck that is the way to go, due to the fact all you have to do is put a drop bracket in the carrier bearing to keep stock drive shaft angle. Just my .02 CDN cents
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Old 11-18-2007, 02:42 PM   #10 (permalink)
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Re: 2 piece vs 1 piece drive shaft

yes you can add a carrier drop bracket but you have to make sure its shimmed correct because of the angle in the shaft might be off. thats why im going with the one piece. the angle in mine was off and it tore itself up from the vibration. ford told me $950 for the drive shaft. im getting a one piece made for $250.
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1997 f250 7.3 XLT ext cab long bed 4x2 bone stock 167k and counting
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Old 11-20-2007, 04:47 PM   #11 (permalink)
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Re: 2 piece vs 1 piece drive shaft

I have a one piece in mine and do tow heavy. Have had it in there towing for over three years. I have just switched the rear yoke to be a flange instead of the straps due to snapping a bolt from hot-rodding. Should never have another problem. My friend that lifted his that had a 2 piece had to install a CV joint instead of a U-joint to get rid of the vibration.
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Old 11-20-2007, 07:55 PM   #12 (permalink)
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Re: 2 piece vs 1 piece drive shaft

just got my driveshaft and put it in an love it so far. no more vibration. i dont know why but my front shaft has alot of play in the slip yoke. i can wiggle it back and forth. love the drve shaft so far though.
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1997 f250 7.3 XLT ext cab long bed 4x2 bone stock 167k and counting
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Old 11-20-2007, 08:55 PM   #13 (permalink)
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Re: 2 piece vs 1 piece drive shaft

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ChrisP</div><div class="ubbcode-body">Not being a driveline engineer, I have determined the guy who did the SD's was not either. </div></div> [img]/forums/images/%%GRAEMLIN_URL%%/grin.gif[/img]

While it's true you shouldn't try and redesign the truck yourself a quality driveline shop should be able to figure something out for you.

I don't think the above quote can be limited to only the driveline engineers.
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