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  #16  
Old August 26th, 2017, 19:51
trippled trippled is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Boostwerks.com View Post
Does the front DS spin freely when not running?

I wouldn't be surprised that it would start spinning simply from the slight bearing drag of the TC.
This. It happens.
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  #17  
Old August 26th, 2017, 20:25
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Desert4x4 View Post
It is, but... I had angled it to perfectly straight, and the vibration was still there. The driveshaft was also rebuilt, balanced and trued, and the vibration was still there. I also replaced the transfer case, no change.
Do the vibes disappear with the DS removed?
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  #18  
Old August 26th, 2017, 22:40
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Re: Front driveshaft spins in 2wd with unlocked hubs

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This. It happens.
Yep..it happened on my 79 Ramcharger with a NP203 t-case, even after the part time conversion kit was installed....it's just friction.

You could reach up and stop it with your hand, then let go, and in a minute or so it'd be spinning again.
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  #19  
Old August 26th, 2017, 23:43
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Front driveshaft spins in 2wd with unlocked hubs

Sounds like the driveshaft needs better balancing possibly.
Just to clarify, you are driving in 2wd right?


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  #20  
Old August 27th, 2017, 05:20
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ehall ehall is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

Make sure you can freely spin the front driveshaft by hand. After that I wouldn't worry about it. Probably surface tension from the oil film creating drag for the chain drive.
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  #21  
Old August 27th, 2017, 07:53
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Boostwerks.com View Post
Do the vibes disappear with the DS removed?
Yes. Very smooth without the front shaft.

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Originally Posted by Demonoid369 View Post
Sounds like the driveshaft needs better balancing possibly.
Just to clarify, you are driving in 2wd right?


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Yes of course. I'm using 2wd not 4FT.

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Originally Posted by ehall View Post
Make sure you can freely spin the front driveshaft by hand. After that I wouldn't worry about it. Probably surface tension from the oil film creating drag for the chain drive.
Yeah I can spin it by hand no problem
Hmm ok thanks.
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  #22  
Old August 28th, 2017, 16:48
Jim Malcolm Jim Malcolm is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

OEM staft? At 4" of lift with aftermarket LCAs and a 242 t-case in my 94, the measurement I gave when getting the new one was nearly 2" longer than the OEM spec. There's only 3" of travel... Smooth as butter at all speeds now after wasting money having the OEM one straightened, balanced and rebuilt.
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  #23  
Old August 30th, 2017, 05:14
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Jim Malcolm View Post
OEM staft? At 4" of lift with aftermarket LCAs and a 242 t-case in my 94, the measurement I gave when getting the new one was nearly 2" longer than the OEM spec. There's only 3" of travel... Smooth as butter at all speeds now after wasting money having the OEM one straightened, balanced and rebuilt.
I ordered a custom shaft. I don't remember the length. It's a long travel drive shaft.
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  #24  
Old September 2nd, 2017, 14:02
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

I used two of the thick plastic tie wraps to hold the driveshaft from spinning. So far it as worked. I've had the Jeep up to 75mph which is about the max I like to do. Problem solved, I suppose.
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  #25  
Old September 2nd, 2017, 14:12
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Re: Front driveshaft spins in 2wd with unlocked hubs

If you have a new custom D/S in the front, and it still does it, you either have issues internal to the tcase @ the front output, or you have issues in the diff.


Either way, they need to get fixed.


Or you can do like I did for a long time in the truck in my avatar.....keep the front D/S inside the truck with all the tools to install it when needed. I did that for MPG, as it was a FT 4wd truck back then.
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  #26  
Old September 2nd, 2017, 20:58
chris420 chris420 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

I have the Warn lockouts and my driveshaft does not spin in 2WD. When the hubs are unlocked the front wheels spin on the bearing whithin the hubs. I have seen Dodge and Ford trucks with manual lock outs that have enough drag to spin the front DS very slowly but nothing fast enough to create driveline vibes. The best way to test is get underneath the jeep with all 4 tires on the ground with it in 2WD and grab the front drive shaft with 1 hand and spin it, it should spin freely if it does not then with your hubs are not working properly or your transfer case is stuck in part time or full time 4wd.
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  #27  
Old September 2nd, 2017, 21:02
chris420 chris420 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

On a second note I have a 6" lift and run stock front drive shafts with no issues. I also run stock front drive shafts in the rear with no issues. I have an NP242 TCase. You don't need a custom drive shaft stock shafts will do however you may need to change the flanges depending on your set up.
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  #28  
Old September 7th, 2017, 11:26
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

I forgot to add that I have 5.13s in this XJ. So the driveshaft speed is significantly higher than with stock gearing.
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  #29  
Old September 7th, 2017, 13:18
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Re: Front driveshaft spins in 2wd with unlocked hubs

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Originally Posted by Desert4x4 View Post
I forgot to add that I have 5.13s in this XJ. So the driveshaft speed is significantly higher than with stock gearing.
what size tires are you running ? may not be that much more
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  #30  
Old September 7th, 2017, 16:49
Desert4x4 Desert4x4 is offline
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Re: Front driveshaft spins in 2wd with unlocked hubs

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what size tires are you running ? may not be that much more
35x12.5r15

Yeah, well its about 3,000 rpm at 65 mph
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