Connected Mcgraw Hill Com Lesson 3
Another factor seldom considered is the vibrations which will be caused by the forces required for acceleration & deceleration of the mass of your driveline. Specifically we are focusing on drive shaft angle on lifted trucks and Jeeps. Place a spirit level protractor on the driveshaft about halfway between the transmission and the Differential. Now that you know enough to determine which type of driveline you need for your particular application, you will want to size it properly for the expected load. I noticed a lot of vibration the first time I drove the truck after installation of the suspension. We generally try to make the truck drive nice by leaving good castor and deal with the driveshaft after that. I have measured my angles and have 2* at T-case output and 14* at pinion. Location: MossyRock, WA. Thanks for your help. I rechecked my angles using a real tilt gauge. Please bear in mind that we are not working with an exact science. Gets rid of the factory junk flange and converts it to a CV style with much beefier components. Please, at least give serious consideration to all of the factors involved when doing any vehicle modification rather than just the obvious end result of more lift, bigger engine etc.
Below ~50km/hr, noise is not noticeable. If my vibes get worse, I'll go with a cardian up front and put the wedge back in. I have an all spring 4" lift like some others here and the only thing I did was have the rear drive line lengthened, no problems since. I have no problems at all. I have a skyjacker 4" on my 72 K5 and the rear driveshaft pinion angle is bothering me. Driveshaft Angle | Measuring Drive Shaft Angles, Problems. I would not go over 65mph because of the noise. Wife's Ride 2014 Fiat 500L. 9 degree is not good.
I believe the '69 is a Rancho kit and the '72 might be either a Rough Country or Tough Country kit. An informative article from Tom Woods, owner of Tom Woods Custom Driveshafts, simplifying the changes made to a Jeep's driveline following installation of a lift kit. If you are like me, rather than relying on just what someone may tell you, you tend to believe something more readily if you have a basic understanding of the principles involved. After paying $480, I installed the new shaft and a 4-degree shim. I decided to put the heavy short leaf on the spring pack, which was taken out initially for flexibility, to make the spring the way it was designed. They have been known to slip or fall out leaving a very loose rearend. It is also very important that you consider the upward pinion movement, caused by spring wrap, on the differential under high torque situations. Using Auto-Cadd, I found that rotating the axel 4 degrees up would give a 2. Both lifts were on the trucks when I bought them. However, most manufacturers, such as Dana/Spicer, recommend a maximum of 7 degrees. Factory drive shafts are built using a C. This type of tube is made through a process of using flat sheets of steel, running it through a series of rollers to form the tubular shape and electric welding the seam. What size lift are we talking about? I have a 4' lift on my spring.
If I take it out, the rear will match the front (within a couple of degrees) but I've still got a bunch of u-joint flex. 70'c/10, 71 suburban4x4 402bb, 72suburban 4/6 drop, 72k/5 4x4 blazer 4" lift 35 tires. The down side to using a tube of an exceptionally heavy wall thickness is as outlined previously, the acceleration and deceleration of mass along with the excessive radial load placed on the adjoining support bearings. My 72 has a 4 inch tough country lift (all springs). Drive Shaft Angle Tech. I have spoken with Kert and we both think 14* pinion angle is high. I know it can only go so far because the steering gets all whacked out. Some background you may already know: Castor is the side view angle of a line between your upper and lower balljoints or kingpins. Typically a Rough Country kit is the one kit that never includes any of the parts you actually need.
Some of the time things that in theory should work, do not, and other times people seem to be happy with a drive-line that by all standards should cause a horrible vibration or short life. This is a problem because with torque at the wheel, the rear angle would be 6. If you double the angle you halve the life, halve the load & double the life and vice/versa. Since the lift was installed, dry spinning horrible bearing noise started when traveling beyond ~50km/hr all the way to max speed, in gear or in neutral, both during coasting, acceleration and deceleration. If you were to support a length of any shafting or tube at the ends, you would find that the shaft or tube will flex in the center. Although your chances for success are greater if you do your homework and design around established principles. Each wedge block is 5 degrees and the final angles ended up like this. You can usually get a pretty good idea of how much the differential will roll up with the following simple test: After making certain that all of your power train is in good working order, and while standing a safe distance to the side of the vehicle where you can watch the motion of the differential. Location: west chester pa. Posts: 2, 474. This is probably because the axel does not rotate as much with the stiffer spring and cause u-joint misalignments. The issue i have now is that my front drive shaft is binding at the axle joint. Most fractures are the result of high stress impact loads, or binding interference's caused by excessive/uncontrolled differential roll or droop. In addition to a straight and properly balanced driveline, proper geometry is the most important design factor to consider when smoothness of operation, ultimate strength and long life are desired.
Only thing is, less of the center pin contacts the spring perch, and it looks like I have sheared a center pin in back (based on axle location). If you intend to sell the vehicle after a year or two, or if the vehicle is only used on the weekend, then there is no point spending the extra money on a cv shaft. My final conclusion is that I need a constant velocity joint driveshaft similar to the front driveshaft. Location: Boise, Id. 2005 Da63t, recently heavily modified with GRImport 4" front suspension drop blocks & 3" wedge shape rear blocks mounted over rear axle. A driveline which is too heavy and/or having radius which is too large along with running through a steep angle can accentuate a problem here. Tuff Country EZ rides in front with a DIY4x Shackle flip in the rear with 4.
Many people call or write telling me about their 600 h. p. engine and to ask me to determine the proper "U" joint or size of driveline for their application. This slight amount of rotation should not cause any oil starvation problems. My driveshaft angle is 16 degrees from level, my transfer case is down 3, and my differential is up 6. What about the 3rd joint in the double cardan shaft? One word of caution though, make sure the pinion tail bearing still receives adequate oil. If that is true, is pinion lubrication a concern? However, that shutter is doing harm to the gears and bearings throughout the driveline. This increases the front u-joint angle to 12 degree. Because all of the angles are up, you need to subtract the smaller component angle from the larger component angle at each joint. Greater strength can be obtained in many ways, among them are: larger diameters, heavier wall thickness and better quality. Here are the steps to correct the vibration problem. This type of failure can be extremely hazardous and costly especially if it occurs at a high speed.
It has been a few months but i finally got things almost back together. Join Date: May 2003. After all it really is a lot less expensive to do the job right the first time. Driveline Geometry 101. Beyond this point the the power train components must themselves flex and distort to allow for this extra motion. Problem being the Skyjacker lift does "rake" it a little already so you'd have to install them up front too. I was hoping I wouldn't have to worry about vibration issues since I only went with a 4''. I installed the Skyjacker 4" all spring lift on my old '72 Blazer and didn't have any problems? For angle problems, let us help you with an Action Machine CV Driveshaft. Now I hope you noticed I stated "very near" when describing this cancellation of non-uniform velocities.
I think it may well surprise you how much spring wrap you actually have. I bet the guy I bought the blazer from put the springs in backwards or spun the wedges around not knowling any better. Even though you know that the operating angles are equal + or – 1 degree, you must still calculate the operating angle (what the U-joint feels) to be sure that they are within specifications. The axel was actually had a. Additionally while this rolling of the differential is easily done with the rear, front ends create a different problem. There are many situations which will cause "U" joint or other parts to break which are not caused by under-sized components.
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