explain measuring pinion for extending Drive Line

[slickrock]

I need to extend my rear DL for SOA and flipped springs. I understand that I need to measure the distance from Pinion while the rig is sitting static (not the best and wish I could go through full range of travel).

DO I measure it on the flat mating surface of each pinion as in the pic?

 

[green71fj]

will you be making the driveshaft yourself

 

[TLCHopII]

Ideally:

1. decide if your going double cardan
2. if double cardan or similar point the rear pinion at the transfer case output shaft
3. you must allow for the length of the double cardan, cv or other than a u joint
4. measure from the face of the pinion flange to the dbl cardan flange
5. if no dbl cardan ensure that the pinion angle is set to the same as teh transfer case ouput flange
6. measure the distance center of plate to center of plate {some measure from flange bolt hole to flange bolt hole with bothe flanges clocked in the samr orientation}
7. take square measure ment (rise over run) utilizing a carpneters square or similar device. This will allo for the static angle to be calculated
8. Now as for shaft extension and driveline angle you will need to check the lengths and angles at both full extension and compression
9. or just call up Tom Woods or similar vendor and solicit their help
10. if not flex to full droop and repeat measurements
11. go to full compression and do the same.
12. Document and report all to your vender d'sour
13. if making yourself then use the shortest meas. minus 3/4" for your compressed length and the longest meas. as your fully extended length
14. as for slip joint length most stock shafts have about 3" of slip yoke travel
15. so if yo are anywhere near that you will need a longer slip yoke. Check with your vendor for minimum/maximum slip yoke engagements

Man thats a mouth ful!
Would be soo much easier to just go to an appropriate vendors site for the forms with diagrams. But heh, just didn't want to plagerise or pimp someones stuff innappropriately

 

[slickrock]

Thanks for the info. HOw much slip does the rear shaft have at static height? I know the front needs a bit more than 3/4". Is the rear the same? (It would have 3/4" of slip available at static height).

 

[slickrock]

how much compression does a stock rear DL have at static height?

Quick question . . . how much slip is availabe for compression on a stock rig's driveline at static (flat) right height? I know the front has a bit more than 3/4" available for compression. Is the rear the same? I am trying to figure out the lenght for making a rear driveline.

If from center yoke to center yoke is 27" with all for wheels flat on the ground, the compressed length, if the same as the front DL, would be 26.25". SOund about right?

 

[peesalot]

Slick, map it out with a min of 3/4" compression remaining in d-line at static. I have about 1" and at rubithon I could see via the grease mark that it came within 3/8" of bottoming shaft but I was working it pretty hard.

I would have an 1" or 1.25" of compression available at ride heigth.

 

[slickrock]

Thanks Mr. Pees a lot . I have a bit more than 3/4" in my front home DL and it works, but the back will get a bit mroe flex so that is perfect. I'll give it about 1.25" or a hair less.