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Crew cab. Use it or lose it.

Overview Gallery Discussion
DavidB said:
Kert, what axle width did you start with? C&C 14ff? How wide is the frame? I assume you widened the wheels as well as moved the center to make them more offset?How wide did you end up with the wheels? Looks like 10"? Looking at doing something similar under the back of my truck but I wanna keep it as narrow as possible.

Thanks.
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Width is a standard 14bff. There is a 1.5" spacer on the hub. Wheels were widened 4" each and the centers were left alone. Widening was done all away from the wheel center so backspace essentially stayed the same.

To fit the wheels on the truck, i had to narrow the spring perch spacing to directly under the frame, which I felt could make things less stable. It doesn't feel that way. Tire foot print is very wide and I also added air bags to the suspension.


EDIT: Looking back and toward the future, I think I should have started with a wider wheel and just recentered it to the dually backspace. I have fixturing to do this now which I didn't have at the time. I think I would end up with a more accurate wheel. These aren't bad, and actually roll down the highway pretty smooth once the flat spots are gone. Just the desire to do the best job possible.

EDIT: Was working on it this morning. The 1.5" spacer is on the inboard side of the hub spacing the rotor away from the wheels.
 
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OK, so I've been chasing a vibration/noise in the drivetrain for some time now.

I was able to drive the truck in front wheel drive with the rear shaft removed and the vibe was very insignificant but still there.

That brought me to the t case which was some what of an unknown value. Some other clues as to the cause had us looking pretty hard at the tcase as well so we went ahead and rebuilt a divorced 205 and dropped it in. No go.

Next was the drive shaft. Angles were close but not absolutely perfect so we tweaked a few things there. No go. Didn't help.

So, only thing left to look at was the rear axle. Figued I'd go ahead with a rebearing for the entire carrier. I didn't see anything going into the rear axle and felt like I was grasping at straws. Then I found this,

spiderdamage.jpg

Not a good picture, if you can see it, the cup bearing on the spider is cracked and spread apart. Spider gear itself is stupid sloppy on the cross and the cross is pretty gnarled up.

I hope that is what I have been searching for. Hopefully tomorrow it'll be back together for the last time.

spiderdamage.jpg
 
Slapperbar said:
That would send transients all thru the truck.
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That has been the mystifying part of the issue.

We did get it back together today but this was not the noise/vibration. Although it was something that deserved attention.

The search continues.
 
bummer... kinda. glad you found that problem - bet you had an "aha!" moment. Hate it when those moments don't turn out to fix the original problem though. just makes me realize my junk has all kinds of issues that i don't know about. :rolleyes: :)
 
Yeah, I definiely had an "aha" moment. I was pretty happy to find some damage actually. Was pretty confident all day that I'd be driving it home again.

Our next attempt is gona be some major revamping of the drivetrain from the transfercase on back. Hopefully when things are finished its a simpler more durable configuration.
 
Does this have a 2 pieve rear shaft? I am only asking because when I had my crewcab I through carrier bearings a few times and eventually fixed it by adjusting the mounting position of the carrier bearing(it wasn't dead on straight with the rear of the t case). It vibrated and would toss the entire rubber isolator.

made one hell-uv-a noise after that thing went.:doah:
 
Have you tried a different set of wheels and tires? Just to eliminate them from the equation. Not doubting your fab skills, just goes without sayin a slight difference will throw everything off.
 
The only way so far that we have been able to stop the noise is take the intermediate shaft out of the trans and basically disconnecting the divorced tcase. Like this it runs smooth.

So far we have done the following to remove pieces from the equation

No rear tires in rear wheel drive.
No rear axle (removed second piece of the rear driveshaft)
No rear drive shaft
No front drive shaft
Manually shifted t case (Possible half in gear half out of gear)
front drive high and low
rear drive high and low
4 wheel drive both high and low

Another thing that has changed the situation is different loads on the vehicle. Drove it home in front wheel drive and the vibration would only be there with no load on it. Coasting or deceling.

The biggest problem with this has been the vibration has been difficult to narrow down to one thing. It seems to have moved around depending on what the conditions were. Like for instance, the rear end was probably making some noises but at the same time we eliminated it from the equation and still had noise.

We've really tried everything we can think of. Only thing left that is suspect is the intermediate shaft.
 
i cant recall what t-case you have but ill assume 205.

Try prying the plate between the 2 shift rails on the 205. Pry it out and wedge something in there to hold it. on My big white truck the I notice one of the rails moves in just a little bit and causes a similar noise/vibration problem.

I also have play on my out put and it goes in a 1/8 to a 1/4 inch in an out.


Just rambling but maybe its useful, id also guess you are twin sticked so no plate in between the rails to try my idea?
 
I believe it is twin sticked and converted to the electric shift setup. Unless he has changed something.
 
Yep, twin sticked and linear actuators doing the shifting job. We did disconnect the shifters and moved them between detents manually to eliminate the shifters as a possible problem.

currently the t case,t case crossmember, exhaust, hanger bearing crossmember and all drive shafts are out.

Hopefully over the next few evenings, I can get the married tcase mounted and some exhaust and drive shaft put back together.
 
The married t case is in and twin sticked. Got to make new mounting brackets for the linear actuators to continue using them. Othewise I could also go back to cable shifters. Not opposed to either but the actuators are here so I'll try to use them.

On a side note, since I'm going to have to reroute the exhaust, it seemed like a good time to put in a PTO on the 205 that I wound up with through this whole vibration dilema. At some point I plan to hook it up to some type of generator. Really not sure what's out there and readily available so options are pretty open at this point. Could do a winch I suppose too. That looks kinda busy though...
 
I'd look at the generators used on the M1031 contact service trucks... they were setup to run off of an NP205 PTO originally.
 
kennyw said:
I'd look at the generators used on the M1031 contact service trucks... they were setup to run off of an NP205 PTO originally.
Click to expand...

I'll look into that. Was also considering building one.
 
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