8 inch lift shim question

[TSewell]

I am going to install my 8 inch lift on friday. My TC is already dropped 2+ inches, would a 4* shim be adequate? What do you recommend? I know every application is different, but a good ball park figure would be nice. Thanks guys!

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[K85 Octane]

 

[TSewell]

Thanks for your suggestion. So maybee a different visual aid. What is the rear pinion suppose to look like, or what is a good or factory diff angle?

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[80' 427]

8" of lift? On 1/2 tons? Holy hell

 

[TSewell]

Not sure how a 8 inch lift effects the axles? I was under the impression that tires, gears, HP, and how you drive effects the axles, not the lift.

When I get home I will post pictures of my current pinion angle. I was told that the pinion angle and transfer case angle must be the same.

 

[TSewell]

Here is a diagram i found online. What do you think? Is it correct? If so i would use a degree finder and messure my TC angle, then find my pinion angle, subtract the 2 and that should tell me how many degress to shim my axle. Correct?

Here is my current pinion angle with my 6 inch lift.

 

[ryoken]

your pointing AT the t-case, so you must have a cv at the other end... just continue to point it at the t-case, down a degree or 2...

the equal angles are for non cv shafts...

 

[TSewell]

your pointing AT the t-case, so you must have a cv at the other end... just continue to point it at the t-case, down a degree or 2...

the equal angles are for non cv shafts...

LOL..No CV buddy....Just a custom length shaft.
Just to be clear i did NOT put this lift on. I purchased the truck like this. I have never shimed a axle before so i had no idea where to even start.

 

[dremu]

LOL..No CV buddy....Just a custom length shaft.
Just to be clear i did NOT put this lift on. I purchased the truck like this. I have never shimed a axle before so i had no idea where to even start.

The proper angle depends on whether you have a CV aka double-cardan driveshaft, or not.

With a single U-joint at each end, then you want the split the angle. This may result in very high angles on the ends, if you have a short shaft and/or a great distance between the T-case and axles, i.e. crazy high lift. In this case a CV shaft may be called for.

If you have a CV at the one end, then you want the pinion pointing straight at the shaft, as you have pictured.

Google is your friend... try these for starters:

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml

http://www.4xshaft.com/driveline101.html

http://www.pirate4x4.com/tech/billavista/PR-shaft/index2.html

The answer for your specific case is you need to measure your specific truck as each case is different. And you may need to change to a CV shaft.

-- A

 

[TSewell]

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml

http://www.4xshaft.com/driveline101.html

http://www.pirate4x4.com/tech/billavista/PR-shaft/index2.html

Awesome Info. Answered ALL my questions. Thank you dremu

 

[dremu]

Awesome Info. Answered ALL my questions. Thank you dremu

No worries. Google is your friend. (Although I'm sure my high school geometry teacher is spinning in her grave at how little I retained )

-- A