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sn22,

Thank You, for sure a long read. My wife often tells people she helped build it by not asking about "details" :) My biggest worry was not liking to travel in it when done. Those fears are gone and we look forward to spending as much time as we can exploring. Now that the main build is over, I'll focus on identifying any areas I can improve.

You should start a build thread, I found it really helps me remember what I did to it and motivation to work on it. Look forward to seeing some of your pictures.

See you on the trails!
 
Well, here we go again. Took the 55 out on the highway and let it run, got a bad vibration @ 65-70 mph. Sounds more like a driveshaft vibe. I have a Double Cardon joint at the transfer. I put a degree wheel on both yokes, transfer case side is 92 degrees and the rear is 84 degrees, 8 degrees difference. Really not sure what to do about it, but starting with taking out the CV joint and going single joint. Hoping that it will take a 8 degree difference and the CV joint is causing the vibe. Having the new shaft made up tomorrow and leaving on Tuesday if I can fix the high end vibe. At 55 the vibe isn't too noticeable.

Any ideas other than cancel the trip?
 
Having a new driveshaft made with a single joint instead of the double cardon, but they had to order the flange and it won't be here until Monday morning. I should be able to pick it midday and see if that's the problem, leaving Tuesday morning for Cruise Moab. Talk about cutting it close. Not sure if I should pack or not.

Mean while we're getting hit with @ six inches of rain, good thing I thought the goats how to do the back stroke. :)
 
The only thing that changed was the rear axle and it's pinion angle, I'm hoping it's not the axle.
 
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I'm sure you're on this, but you didn't install the slip 180 out right? I've found even one spline will mess up the balance...just throwing out ideas. I'm sure you've had it rechecked for balance at this point if you're making a new one. FWIW I've got way uglier angles in the rear of my 40 with a H55 and DC, no vibrations up to 75-80mph ...

Tucker
 
No way to shim the axle to buy a few degrees? Man, that's cutting it close...
 
I had shims in the old stock axle and the new axle has the pads set at the stock angle. I was advised to get rid of the cv joint and go back to a single u joint. I used the shims to point the axle pinion at the transfer case, as you would with a cv joint. Now in order to get the joints to run parallel I'd have to point the axle down. I'll try the new shaft and see how it runs out. Everything was in phase and was balanced before I changed the axle.

Hope all that makes some sense.
 
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scrapdaddy said:
I'll try the new shaft and see how it runs out.
Click to expand...

If I had to bet I would say you’ll be fine at the speeds you drive, the drive shaft speed is roughly the same as engine RPM (slightly higher with your 5 speed in overdrive) and with your tire gear combo your drive shaft will never see what would be considered excessive RPM for your given angles.

I would however call Kurt and get a set of his supper wammy made in Japan U-joints, of the four brands I’ve tried these are the only ones I haven’t destroyed quickly with my engine torque and driving style
 
Both of the drive shafts are from Tom Woods and use the 1310 series ( I think ) u-joints. Now this new rear shaft is being made at a St. Louis shop, but same joint. You're right about my speed, I never noticed the vibration until 60 mph and I hadn't done that since the new axle was installed, really don't go over 60 much.
 
Not that my input will be much help, but when lifting new Toyota Tacomas, they run into the same issue as your having. When i lifted my Tacoma i chased the vibration all over the place (differential bushing, driveshaft carrier bearing, rear shocks, ujoints, ect) To find out it was just the driveshaft angle being off by a few degrees. In my case i decided to live with it, as the problem only arose above 60mph. Albeit it was annoying at times, i drove it that way for 2 years and 40,000 miles without any issues. Not saying that it couldnt cause any issues, but for me it was more an annoyance than anything, and in the tacoma world it seems to be what most people just live with. Of course i could have shimmed the rear axle, and i did start playing with that at one point in time, which moved the vibration to different speeds, i was going to switch out rear leaf packs anyways, so i stopped looking for a solution. 6 months after screwing with it i upgraded (depending on who you ask) and got a newer tacoma, and i'll start the process over again. lol. Luckily i know where to start now though.
 
ALL input helps me! That's good to know. I'd like to solve the problem as at the higher speeds it was pretty bad. Maybe I can squeak by for this trip and work it out for the Pig Party.

Thanks!
 
scrapdaddy said:
Now this new rear shaft is being made at a St. Louis shop, but same joint
Click to expand...

My first rear drive shaft had Spicer u-joints and slip yoke and I quickly destroyed them (although I destroyed a new pinion gear at the exact same time) I felt these parts should have lived with what I was doing at the time.

If you look close you can tell the two ends are not clocked properly, slip yoke twisted one and a half spline positions.

pinion-jpg.1129950


pinion-jpg.1129950


The drive shaft shop that built my shafts pushed Spicer claiming they were the best and they stand behind their parts, even though I didn’t expect any of these parts to be covered under warrantee I asked the question when ordering the new parts from the original venders, Sierra Gears replaced the gears no questions asked (Cruiser Outfitters) and Spicer said because I had an aftermarket engine that I voided their warrantee. New rear drive shaft was built using a Toyota slip yoke and another brand of u-joints and stood up to the same conditions that destroyed the first combo for about 1000 miles then the U-joints started to get loose, after buying several brands of U-joints locally I was asking Kurt if he could recommend something more durable and he told me about his OEM quality U-joint that he stocks, having reasonably low expectations this was going to be my long-term solution I ordered a set to get me going until something permeant could be found (larger joints with custom flanges).

These same joints and Toyota slip yoke are still in the rear of my pig today and feel just as tight as the day I put them in, I hammer on these parts to the point that I start tearing the leading edge at the base of the lugs on the rear tires from the hard starts and aggressive driving style running through the gears.

None of this may apply to you but I wanted to pass along my expensive lesson using aftermarket drive line parts.
 
The new drive shaft is in with just a small vibration over 60, so we're packing and heading to Moab in the morning. I should say, if any of the roads out are open. Major flooding in every direction and they're shutting down the highways and all the back roads are down. I'm high and dry, but can't go far. Talk at you guys later.
 
Glad you in a high spot. Saw a section of I44 is closed due to flood damage. Safe travels.
 
Man, the road we were planning on taking is closed this morning, so need to find a way out. I thought living by a lot of rivers was a good thing. :) This area has been having 500 year floods every other year lately.
 
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