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How long is too long??



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Old 08-01-2008, 11:01 PM   #1
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How long is too long??

Ok,before we go any further this is in reference to a driveshaft.

I have always had rigs in the 90-115" WB range & the d-shafts never seemed to long in the rear.
My current project is a different story though. It has been shortened over two feet & if i dont use a carrier bearing the rear d-shaft will be in the 65"-68" long range......seems awefully long. Again,always having shorter rigs,i dont have too much experiance with those pesky carrier bearings. They seem to me as just another place for things to go wrong.So,im trying to avoid using one if i can.

This brings me to the question at hand. How long of a driveshaft is too long?
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Old 08-01-2008, 11:08 PM   #2
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I wouldn't run one, that is just one more thing to fail on the trail. (I made a rhyme) But what in the hell do I know, I havent wheeled my own rig in a year and a half.
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Old 08-02-2008, 12:17 AM   #3
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That's about 5.5' long. I dont think it would really be much of a problem as long as it's thick enough. The only thing is you may hang up on it if it hangs down enough. My K30 had a one piece shaft, as does my K25, and it was probably close to the same length or longer. I never wheeled it in the rocks, but it held up fine with what I did do with it.
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Old 08-02-2008, 10:24 AM   #4
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I dont think it would really be much of a problem as long as it's thick enough. The only thing is you may hang up on it if it hangs down enough.
If hanging up on the driveshaft becomes too much of a issue then ill just be forced to find some rockwells. That'll get the shaft up & out of the way.


I'll prolly try it for a while. If it becomes a problem,then ill do something else.
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Old 08-02-2008, 10:26 AM   #5
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I wouldn't run one, that is just one more thing to fail on the trail. (I made a rhyme) But what in the hell do I know, I havent wheeled my own rig in a year and a half.
Any plans to wheel yours in the next two weeks??? (hint,hint)
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Old 08-02-2008, 05:55 PM   #6
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Well if you blow the rear driveshaft out by hitting a rock, then you can always drive front wheel drive home.

But as for carrier bearing, I never had a problem with them in either of the trucks that I had them in. Hell one of them had 350,000 and the carrier bearing was never a problem.

Buddy of mine ran them in his 69 chevy truck and he abused that truck more then any of us put together. carrier bearing was the last thing we was worried about! LOL
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Old 08-02-2008, 06:09 PM   #7
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Ok, I'm going to show my ignorance here, but with a carrier bearing, doesnt that also add at least one more u-joint?
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Old 08-02-2008, 06:18 PM   #8
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Ok, I'm going to show my ignorance here, but with a carrier bearing, doesnt that also add at least one more u-joint?
Well it isn't a ujoint. It's just a bearing that the shaft slides into. If I recall right it does add a ujoint, but it has never been know to fail like the one on the tranny or rearend.
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Old 08-02-2008, 06:25 PM   #9
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Here is a thread that shows the basic setup,

http://www.pirate4x4.com/forum/showthread.php?t=553457
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Old 08-02-2008, 07:49 PM   #10
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Here is a thread that shows the basic setup,

http://www.pirate4x4.com/forum/showthread.php?t=553457

If I would have kept the M880 this is the setup I was going to run since my rear shaft was soooo long. It would have greatly improved my breakover point on that rig, which was 130" WB.



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Old 08-02-2008, 08:17 PM   #11
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Ok,now i have both sides.

Bruiser: My rig is sitting at 138" WB right now. Did the long rear d-shaft you ran on your M880 give you problems or prevent you from climbing stuff?

Most everything is tucked up nice & tight out of harms way. The rear shaft however does hang low a bit too soon for my taste.

The rig had a 4 spd/205 to start with & had two long shafts in the rear with a carrier.
I was hoping that the doubler would add enough length that i could ditch the carrier.
Now im wondering if i should find a way to keep it.


Question concerning the carrier & second shaft: How much angle is acceptable on the rear shaft without causing unneeded wear on the carrier?
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Old 08-02-2008, 09:01 PM   #12
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Well, I must ask, do you have the shaft now? I mean will you be able to wheel it. If you already got a long shaft just run it for now. You can always build later.

Meaning you going to be at the River wheeling with us!!!!
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Old 08-02-2008, 09:03 PM   #13
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Also if you got the carrier already and just need to shorten one of the shafts then just do that.

As for length you want to keep a good angle on the ujoints to keep them from being over stressed.
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Old 08-02-2008, 09:09 PM   #14
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the driveshaft in my buggy is i think right at 50" or so and i've rode on it a couple times no problem but i do only weight 2700 lbs
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Old 08-02-2008, 09:37 PM   #15
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Well, I must ask, do you have the shaft now? I mean will you be able to wheel it. If you already got a long shaft just run it for now. You can always build later.

Meaning you going to be at the River wheeling with us!!!!
I have both. The 2 shafts with carrier that was on the truck when i got it,and one long one that i built to replace the two.



As for the river.........

The truck will be really close,Crazy Train should see the river by the 15th.

BUT, if the 4 door from H3ll isnt done i have a couple of tricks up my sleeve that'll have me wheeling with ya'll no matter what.

Last edited by mudnmyvayne; 08-02-2008 at 09:45 PM.. Reason: spelling
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Old 08-02-2008, 10:49 PM   #16
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You can always wheel the tow rig.

Are you still at stock wheel base with that thing?

If you do need the carrier bearing build a shaft using a heavy duty pillow block bearing. You can order them through fastenal pretty cheap. I'm running one on the front of the s10 along with a th400/205/208 slip yoke and have only had two issues, and they were both my fault. I didnt get the set screws tight enough and it came loose at the river on the first run. The second time I broke the weld loose on the intermediate shaft after I came down hard on a ledge at Satan's. Somebody forgot to weld the whole thing.
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Old 08-03-2008, 01:34 AM   #17
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Are you still at stock wheel base with that thing?




The wheel base has been shortened over 2'. Overall i think i have lost about 4 1/2',maby a little more from the total length

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Old 08-03-2008, 04:21 PM   #18
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Ok,now i have both sides.

Bruiser: My rig is sitting at 138" WB right now. Did the long rear d-shaft you ran on your M880 give you problems or prevent you from climbing stuff?
The first trip it to BMRA it got scuffed a little, but not enough to stop me. Then I went to Clayton in it and I made it look like a preztel on the 2nd trail we ran. IMO it wasn't an extreme trail by any means. This is where I had Slim build me a new one out of Sch. 40 pipe and I had no more problems the rest of the weekend.

I would definitely recommend the midship shaft with a carrier bearing, I think it will be worth it.



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Old 08-03-2008, 06:04 PM   #19
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You can always wheel the tow rig.
When have you known that to slow me down?
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Old 08-03-2008, 10:09 PM   #20
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