Topic: shackle/pinion angle?

[toyodaaddict]

i heard somewhere that for every extra inch of shackle your pinion will change 1 degree.  for example a 4 inch longer than stock shackle will change your pinion angle 4 degrees.  can anyone tell me if this is true?

[raidernation]

I dont know about that formula but you don't to put too much angle on your pinion (you'll starve it of oil) so try to keep it reasonable.

[crazy white boy]

i have never heard that. i put mine about 2 degrees down and it works just fine

[91 ex-cab]

i have never heard that. i put mine about 2 degrees down and it works just fine

So your pinion points to the ground


To the original poster, I do believe your pinion angle changes with longer shackles. But I don't think it is enough to cause problems.

[crazy white boy]

i meant 2 degrees down from straight in line with the driveshaft

[91 ex-cab]

i meant 2 degrees down from straight in line with the driveshaft

Ah, that makes more sense. I've never really heard of people having problems starving the pinion of oil.

[4RunnerChevy]

Ah, that makes more sense. I've never really heard of people having problems starving the pinion of oil.

You can over fill it, if your worried.

[marktrd4x4]

The greater the pinion angle the greater strain on the joint and pinion bearings. The only formula to use would be to measure @ the pinion u joint and at the transfer u joint. Using an angle gauge and the difference between the 2 angles should not be greater than 4 degrees. Generally speaking most rigs I've seen don't shim up the pinion angle they just get a modified length drive shaft. If you shim the pinion angle the using the leaf springs the center pins are more likely to shear off. But if your more like to be on the highway than on the rocks then shim to your hearts content.