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Old March 18th, 2013, 08:10 AM   #1
974x4Taco
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Default Setting caster and pinion angle on a hp60

I have read and read and read and still have some questions.

First off the axle is getting cut apart so i can set these angles anyway they need to be.

First the pinion....i read that 14 degrees is the max angle...after some measuring i was shooting for 12....should be fine correct?

Now for the real question i cant get a answer on.....caster....i know everyone sats 4-6* and i understand why....but here is the thing....the closer to 0 the tighter your turning circle so is there any reason on a offroad only rig like my Toyota that i can't set it down around 2* and take advantage of the tighter steering since handling at speed on the road is not a issue? Or will not turn that much better and i should just go 4-6 like everyone else?

Any help would be appreciated
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Old March 18th, 2013, 09:46 AM   #2
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I've never seen numbers on what is acceptable, but I wonder why you are worried about pinion oiling when you plan to run near 0 caster since it isn't a driver. Most people are worried about pinion oiling at higher speeds, not trail conditions.

Have you done any math or real world testing to see how much turning you will lose? (I haven't) Do you know that your tires won't get into your links or springs before you hit the stops, and that isn't your limiting factor?


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Originally Posted by 974x4Taco View Post
I have read and read and read and still have some questions.

First off the axle is getting cut apart so i can set these angles anyway they need to be.

First the pinion....i read that 14 degrees is the max angle...after some measuring i was shooting for 12....should be fine correct?

Now for the real question i cant get a answer on.....caster....i know everyone sats 4-6* and i understand why....but here is the thing....the closer to 0 the tighter your turning circle so is there any reason on a offroad only rig like my Toyota that i can't set it down around 2* and take advantage of the tighter steering since handling at speed on the road is not a issue? Or will not turn that much better and i should just go 4-6 like everyone else?

Any help would be appreciated
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Old March 18th, 2013, 10:13 AM   #3
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The tires will not get into the springs....i will have a ~6" wider axle wms to wms than what i have now and i currently clear easy. The specs i listed for pinion angle i got from pirate...i guess i do not know the accuracy for sure....but i would rather be safe than sorry.....additionally 12 points the pinion at the tcase nicely so really thats my ideal angle....i was just stating it falls within what seems to be the accepted specs

I don't actually know how much i would gain in steering.....it may be nothing....i am also unsure how to figure that out....guess i need to keep reading
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Old March 18th, 2013, 10:22 AM   #4
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Less reading. More doing. You can probably do a quick check of what you gain or lose with a set of tires and jack stands in 30 minutes.
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Old March 18th, 2013, 10:30 AM   #5
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John has a portable D60 you could use.
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Old March 18th, 2013, 10:58 AM   #6
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It's a one piece design again. It's all weldereded up.
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Old March 18th, 2013, 11:10 AM   #7
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The hard part is i am having someone else swap the axle side to side for me so i need to tell them what i want.....that and my current axle is still in the truck so i can't just put this one in and play with it....i was able to do some measuring and simulate the new axle to find the pinion angle but measuring turning radius in relation to caster will be a little trickier.

You are correct though that is likely the best thing to do
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