That orange K5 as my avatar is up 2" in the front with new springs and 2" spacers in the back.
Below, there is about 1300 lbs tongue weight on the hitch from a load of firewood in the trailer - so it looks a little down in the back.
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The 2" spacers in the back came with an instruction sheet that was 100% wrong in positioning the tapered adapters. I'm not going to post the company name as they were very abusive to me over the phone and threatened me with a lawsuit if I mentioned their name in a negative way on the internet.
They stated in the installation booklet that the tapered shim has to be installed with the thick end rearward, away from the engine.
That was wrong because their way pointed the pinion up toward the transfer case, and I called them to ask if they knew it --- then they went off on me.
So buyer beware!
FWIW --- the driveshaft u-joint must have the same angle as the transfer case output u-joint or there'll be fuzzy mirrors and some wrapping up of the driveline when you come off a stop.
Acceleration - if you apply enough torque - will try to wind up the springs and that will point the pinion even higher ... and if you hit the brakes hard, it tries to pull the driveshaft out of the transfer case.
I Googled a lot of sites and they all state that the angles must be the same +/- a degree or two --- but not much deviation is allowed!
I bought a
Klein 035DAG to make sure that I was getting the angles correct.
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Under $30.00 on Amazon.
You NEED THIS TOOL (say that 10 times)
The differential casting has a fin that runs parallel to the pinion shaft, so it's a good place to start when you shoot the other angle at the transfer case output slider.