Grinding from transfer case when first off and back on the gas at speed

[AZ77Bronco]

Thanks guys.. I was and am use to setting up the CV on my lifted jeeps. I just didnt notice that the PO must have taken it out with the extension when lifted. It was working fine with no vibes, straight down the road, with the U Joint set up, but then again it was set up with a lower pinion angle that way. You are right Paul. I havent had it long enough to find all the quirks yet.. They are starting to snow ball now.. I have a good base though and will bring it around. Thanks for all the help and will keep you posted when I get the angle and shaft correct to see if that fixed the problem.

 

[70_Steve]

I figure Im going to put in the shims and save for a drive shaft.

By your username I assume you live somewhere in Arizona, but I don't know where. You could update your User CP with that information.

If you live near Phoenix, there are a couple good driveshaft shops capable of just adding a CV to your existing driveshaft. Much cheaper than buying a new driveshaft. Might want to PM CB.com user driveshafter. He does driveshaft repair in a shop on the northish side of Phoenix.

 

[AZ77Bronco]

thanks for the info Steve. Im in Tucson. I know a few here I have dealt with on my jeeps. When I get some time from work, and some more cash to throw in the pit, Im all over it. Thanks again..

 

[4runner125]

I am having the same vibration/grinding. If my driveshaft angle is off, I have heard of shimming the rear diff to decrease the angle. Any suggestions?

 

[70_Steve]

I am having the same vibration/grinding. If my driveshaft angle is off, I have heard of shimming the rear diff to decrease the angle. Any suggestions?

http://classicbroncos.com/tech/measure-pinion-angle

 

[blubuckaroo]

What 69red said!

By the way, we'd love to see pics of this beast. Not only because it helps to see things like suspension and pinion angles, but because we like to see pics of new-to-the-forum rigs!;D

Since you can't post pics up directly to the forum unless you become a contributor for 13 bucks a year (or whatever it is) you can still post pics by either using another image hosting site on the internet and then linking it here, or just e-mail one of us the images and we can post them up here for you.

Either way, it's just way more entertaining to see pics.

Paul

Paul, are you getting a $1 commission now for signing up new members?;D

 

[driveshafter]

pinion angle

your rear pinion angle should be a NEGATIVE 1 TO 3 DEGREES any more or any less will cause vibrations and noise

 

[driveshafter]

driveshafts

call me if you have any questions 20 yrs exp and im in phoenix to

 

[bax]

your rear pinion angle should be a NEGATIVE 1 TO 3 DEGREES any more or any less will cause vibrations and noise

what if its a front end with a high pinion. What should my pinion angle be with this set up?

 

[driveshafter]

pinion angle

ive never been asked that i realy dont know but if you give me a hour or to ill call some of the og's and ask them

 

[driveshafter]

pinion angle

Pos 1 to 3

 

[driveshafter]

Grinding

http://classicbroncos.com/tech/measure-pinion-angle

shims help u might be hering ujoints too

 

[DirtDonk]

Nice rig for sure! Did you happen to take any pics of the rear driveline directly from the side? In other words, just in front of the rear tire looking inward.
If I missed it, sorry 'bout that. Didn't see it in your pics though.

Thanks

Paul

 

[AZ77Bronco]

Hey paul.. weird that I just logged on to your message. I been super busy at work and have not been able to give this thing attention. My daily driver 90 Bronco has been giving me trouble and been taking the little time I have.

So, the update is... Measured the angles and put in shims. Im at 19 at the rear pinion and 21 at the transfercase output. The new CV shaft is on its way. I should have it in by next week. The sound is still there, hasnt changed since straightening out the angle, and Im not convinced the shaft will help. It drove fine with the u joint drive shaft and I didnt expect the angle to just fix it but dont think the cv shaft will either. I will keep my fingers crossed and keep you posted when I get it installed and try it out. Thanks for checking in..

Pete

 

[DirtDonk]

Paul, are you getting a $1 commission now for signing up new members?;D

Hey! I'm only getting .025 per! Gotta' bring a bunch in just to make a quarter.
Guess I'm on the wrong program. Gonna have to talk to Jon...

Paul

 

[DirtDonk]

Hey 777, I forgot to mention your trackbar angle. If your truck seems to steer straight and easy, then don't worry about it. But if you get a funky motion under certain circumstances, it might be that your angle is too steep compared to your tie-rod.

Looks like you have an F150 tie rod (I think we discussed this already, but I forget) so the angles are no longer parallel and lengths are no longer equal. So if you feel some unsettling steering, you might look into a trackbar drop bracket.
Because of the steering linkage swap, it might not be a perfect fix, but it might still be of some help.

Paul

 

[AZ77Bronco]

Ya its a totally custom built high steer tie rod and drag link. steers and goes straight down the road better than my 90. I can let the steering wheel go at 45 for miles, no shake, no bump steer, no wander. Hoping to get the driveshaft for the weekend and will update. The only thing left will be something in the rear end but dont know what or why.

Pete

 

[AZ77Bronco]

Problem Solved.......

Wanted to do an update, since I finally got time to work on it. I had another bit of a set back, because the CV shaft I received from wild horses had an issue. No fault of theirs. These shafts are made by tom woods and sold by them. Wild Horses had no problem in taking it back, but Tom Woods took it upon themselves to send me a new one.

Now a recap of what I did and the results of each step. Remember I had a U Joint drive shaft in the rear when I bought it, unknown to me at the time. I do not remember feeling or hearing the grind when I bought it but whether it was getting to know the vehicle or it got worse.. it was discovered and felt and sounded like it was getting worse.

Transfercase rebuild-found a sloppy bearing, not super bad, but case didnt look like it was ever opened up, so lets tighten up the 40yr old case. I also replaced all bushings and the mounts associated. Result-grind subsided quite a bit, probably a combination of both actions above, but problem not gone.

Discovery of no CV shaft. I feel pretty stupid about this one. All I can say is I really didnt know they had cv shafts in the rear this year. The bronco had no vibes at all with this shaft, but then again if it was set up for this shaft, and built for it, it probably wouldnt.

I started with finding what angle I was off for the new CV shaft install and what shims I would need. This is the weird part. I was off only a few degrees. I wouldnt think the U joint drive shaft I had in there would ride without vibs at that angle either.

I put in 2.5 degree shims which brought me to 21 at the trans case and 19 and the pinion output. I was happy with that. I drove it, for a short drive on the flat road, for giggles like this, knowing the angles were not set up for it, and had no change in how it felt or sounded after the transfer case fix.

Put CV shaft in the rear. Problem solved completely. No vibes, no sound, no grind felt from transfercase at any speed on or off the gas..

I want to thank everyone that helped and gave input. I have had jeeps most of my life and worked on lifts on all. I have delt with vibes and angles many time before. I have never ran into a problem that give symptoms like this.

In my opinion, and looking back at everything I did and the results, I believe, even with the angle that I had before the shims, that the drive shaft would have solved all my problems from the start. Im still happy I did the t case mounts and shimmed it right.

Thanks again all and happy holidays

 

[DirtDonk]

Excellent news! Thanks for reporting back.

Now we can have a good holiday too!

Paul