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I finished installing my Marlin dual crawler last weekend. The problem I am having now is that there is a REALLY bad vibration coming from somewhere in the driveline.

I thought it was the driveshaft at first, but I got it balanced and that did not solve the problem. The vibration is worst when accelerating between about 2500 and 4000 rpm. It does not occur when idling or when I let up off of the gas.

Also, I went with the two piece rear driveshaft (like stock for a 93 ext cab) but of course had the front section shortened 6.5".

Has anyone else had a problem similar to this? Is the front section driveshaft too short??? Right now I would go get a one piece shaft, but I don't want to spend the money and that not be the problem.

Or, is this just part of have the dual crawler...I could live with that if I knew what it was.
REALLY
 

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Originally posted by Phil Uptmor:
<STRONG>I finished installing my Marlin dual crawler last weekend. The problem I am having now is that there is a REALLY bad vibration coming from somewhere in the driveline.

I thought it was the driveshaft at first, but I got it balanced and that did not solve the problem. The vibration is worst when accelerating between about 2500 and 4000 rpm. It does not occur when idling or when I let up off of the gas.

Also, I went with the two piece rear driveshaft (like stock for a 93 ext cab) but of course had the front section shortened 6.5".

Has anyone else had a problem similar to this? Is the front section driveshaft too short??? Right now I would go get a one piece shaft, but I don't want to spend the money and that not be the problem. </STRONG>
Any play in the center bearing? How about the angles on the driveshaft and end-joints? Is this a CV-type rear section or u-joints on both ends? How about play in the transfer case output flange or pinion flange?

Since the vibes are worst with acceleration and go away coasting, that could be the pinion is tipped up too high, acceleration tips it even higher, coasting drops it lower:

driveline angles

The above information mainly applies to one-piece driveshafts, the 2-piecers are a somewhat different.
 

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I just installed a crawler in my 97 Tacoma, and i went to a 1 piece driveshaft, Marlin told me that i didn't want a 2 piece because of possible driveline vibs. With the 1 piece (non CV) i get no viberations.
 

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Discussion Starter #5
>Since the vibes are worst with acceleration and go away coasting, that could be the pinion is tipped up too high, acceleration tips it even higher, coasting drops it lower

Hmmm, my pinion angle does seem to be a bit high. How is this corrected, with shims? As far as the center bearing goes, I just replaced it a few months ago.

>Where is the center bearing located? Are the two sections of driveshaft in line?

Actually, no. Since the transfer case is pushed further back, the two pieces are at a -slight- angle.

>I just installed a crawler in my 97 Tacoma, and i went to a 1 piece driveshaft, Marlin told me that i didn't want a 2 piece because of possible driveline vibs. With the 1 piece (non CV) i get no viberations.

He told me the same as well, but I gathered other advice that recommended I keep the two piece steup. If this is what the problem is, I will have to get a one piece.

Which is a better way to go, re-retubing the first section of my driveshaft to the proper length, or getting an aftermarket one? Who is a good aftermarket driveshaft company, how much do they charge, and how long does it take to get in?

Thanks!

[ 08-29-2001: Message edited by: Phil Uptmor ]
 

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Its NOT something you have to live with because of the crawler...mine doesn't. Sure sounds like something in the driveline, but I don't know of a good way to find out without $wapping parts.

What you get tired of <IMG SRC="smilies/smokin.gif" border="0"> clutch? It will all be worth it when you get to wheel with the crawler <IMG SRC="smilies/biggrin.gif" border="0">
 

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I had a problem with the 2 piece drive shaft as soon as I lifted my truck with vibration. The carrier bearing had to be replaced 3 times in 1 year due to the added stress on the rear section. I had a 1 piece made because I was tired of buying carrier bearings. If fixing the pinoin angel with shims doesn't work I would get a 1 piece shaft made. AZ driveline (gloeco) and high angle driveline seem to be the popular companies on the board.

Jeremy

By the way, when you need a carrier bearing (and I'm sure you will need a new one again shortly) I have a new one in the box I'll sell for cheap, also BAP did have them new for $80.
 

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What year is the truck? What style? maybee you can get a one piece from a J-yard that is too long and try and get it shortened for fairly cheep. If you go this route get a cv style then if it goes away but you need a rebuild on the shaft get onetoncv aka jessy at high angle driveline to build you a quality product at a very reasonable price. He has done mine but my crawler goes in this weekend.
 

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Originally posted by Phil Uptmor:
<STRONG>He told me the same as well, but I gathered other advice that recommended I keep the two piece steup. If this is what the problem is, I will have to get a one piece. </STRONG>
You got bad "other" advice <IMG SRC="smilies/frown.gif" border="0">

Go to a single rear shaft (w/ a CV if you think you need it)... the 2 piece shafts are <IMG SRC="smilies/puke.gif" border="0">

[ 08-30-2001: Message edited by: DRM ]
 

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Originally posted by bullfrog:
<STRONG>AZ driveline (gloeco) and high angle driveline seem to be the popular companies on the board. </STRONG>
Actually a lot of people on this board have had PROBLEMS with Gloeco. Go with
High Angle Driveline, I have NEVER heard anyone complain about them and they have really fast turn around time. Plus Jess seems to be a really good guy to deal with and his in on this board. If you are really lucky you might even win a free driveshaft from him! <IMG SRC="smilies/eek.gif" border="0">
 

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Dumb, simple thing to check....but make sure the Tcase isn't hitting the floorpan or crossmember. The "tunnel" part of the floor doesn't go back far enough to clear the second Tcase all the time. If it's hitting something solid, it'll make even minor vibes seem major.

That's not to say it *isn't* your driveline, but that's one thing to check.
 

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i will bet you a dollar to a dounut hole that it is your drive line. call jesse at high angle and he WILL solve your problem.
 

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"Actually a lot of people on this board have had PROBLEMS with Gloeco. Go with
High Angle Driveline, I have NEVER heard anyone complain about them and they have really fast turn around time. Plus Jess seems to be a really good guy to deal with and his in on this board. If you are really lucky you might even win a free driveshaft from him!"

I got my front driveshaft from Jessie @ high angle. I got a good deal and he seems like a cool guy. I was an ass and accidentally sent him a Land Cruiser d/s out of the garage, he sent it back n/c and didn't even mock my incompetence! Got the right one to me in short time, and I was soon beatin it!

I really need to proof my reply's
[ 08-30-2001: Message edited by: Sloarhunter ]

[ 08-30-2001: Message edited by: Sloarhunter ]
 

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Talk to Jesse... I did today.

I'm getting a second driveshaft from him next week.

I'm going to be replacing the 2 piece driveshaft on my 85 longbed with a one piece w/o CV. I also have a dual crawler. If I have vibe probs I'll put a CV in later.

Jesse said that if the flange to flange measurement on MY TRUCK is over 50" I could probably do w/o a CV on the transfercase side as long as I rotate the pinion to point towards the tcase.
 

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>Since the transfer case is pushed further back, the two pieces are at a -slight- angle.

My 2 piece shaft is at a relatively large angle and I get no vibes.

>He told me [get a one piece] as well, but I gathered other advice that recommended I keep the two piece steup

What kind of douche bag wanker bone head would reccommend a 2 piece shaft! Oh, wait a minute...
 

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>What kind of douche bag wanker bone head would reccommend a 2 piece shaft! Oh, wait a minute...

Well, Robert, I'll just have to get over and look at yours when you get back <IMG SRC="smilies/wink.gif" border="0">
 

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Originally posted by Phil Uptmor:
<STRONG>>What kind of douche bag wanker bone head would reccommend a 2 piece shaft! Oh, wait a minute...

Well, Robert, I'll just have to get over and look at yours when you get back <IMG SRC="smilies/wink.gif" border="0"></STRONG>
Do that! We can compare angles, etc. I should have my retubed trail spare back by then. In any case we can see if either of my shafts fit your truck and give it a spin to rule out the shaft itself...
 

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my truck was doing the same thing. really anoying.

i had two of the three u joints replaced.

drives like new!
<IMG SRC="smilies/eek.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 
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