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Old 02-25-2012, 07:19 PM   #1
badanglia
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Default degree on driveshaft to pinon angle

changing 4 link position, the drive shaft is 2 degrees up to the yoke, the pinion yoke is 0 degree. To get the 2 degree pinion angle, do i leave alone, or set the pinion 2 degree down, thanks
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Old 02-25-2012, 07:37 PM   #2
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Default Re: degree on driveshaft to pinon angle

You want to obtain a realtionship between your pinion angle and crankshaft angle, not the driveshaft. If you make them both the same , that will be very close to where you want to be at ride height.


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Old 02-25-2012, 07:43 PM   #3
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Default Re: degree on driveshaft to pinon angle

I'm no expert but my driveshaft is at 2* and put my pinion yoke at 2* down and i haven't had any trouble .
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Old 02-25-2012, 08:18 PM   #4
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Default Re: degree on driveshaft to pinon angle

you have to know the degree of tailshaft/driveshaft, then make the degree of pinion/ driveshaft the same but opposit up or down angle this "times "your u-joints. you then add your pinion angle . example..... if your tail shaft is level and your driveshaft runs uphill toward your pinion at 2* then driveshaft needs to go down hill 2* from the pinion. after doing this you then turn the pinion down whatever degrees you choose
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Old 02-25-2012, 09:29 PM   #5
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Default Re: degree on driveshaft to pinon angle

motor is 2 degrees up which the driveshaft is also, at ride height the pinion is at 0 degree , driveshaft same as crankshaft is up 2 degree, so to get 2 degree down at pinion, do i leave alone or tilt pinion down 2 degree
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Old 02-25-2012, 11:04 PM   #6
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Default Re: degree on driveshaft to pinon angle

If crankshaft/tailshaft is 2 deg up and pinion is 0 deg. Your pinion is 2 deg down in relation . So it's set where you want it.
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Old 02-25-2012, 11:12 PM   #7
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Default Re: degree on driveshaft to pinon angle

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Originally Posted by badanglia View Post
motor is 2 degrees up which the driveshaft is also, at ride height the pinion is at 0 degree , driveshaft same as crankshaft is up 2 degree, so to get 2 degree down at pinion, do i leave alone or tilt pinion down 2 degree
I'm not sure how to visualize that, but here's a good graphic describing the possible relationships:



BTW, coyote nailed it: the reason we bother with driveline geometry is to time the u-joints with one another.
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Old 02-26-2012, 07:28 AM   #8
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Default Re: degree on driveshaft to pinon angle

You want the pinion angle set so that the rear u joint is as close to straight as possible under load. Timing of the joints is set when shaft is welded. ---Trevor
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Old 02-26-2012, 10:33 AM   #9
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Default Re: degree on driveshaft to pinon angle

when doing your pinion angles as long as you have the houseing at ride height you could turn your car on its' side or up-side to adjust pinion angles. it all is figured on tailshaft / pinion and the angle the driveshaft go's from one to the other. I understand what jonestre is speaking of ....he's right about that also, but....you need the u-joint at the front working at the same degree as the u-joint at the back, also considered "timeing". you then start adding any pinion angle if needed. by no means I am disagreeing with what jonestre stated....thats very important.
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Old 02-26-2012, 10:45 AM   #10
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Default Re: degree on driveshaft to pinon angle

Simply stated........."pinion parallel with crankshaft under load"..........everything else will take care of itself.
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Old 02-26-2012, 11:03 AM   #11
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Default Re: degree on driveshaft to pinon angle

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Simply stated........."pinion parallel with crankshaft under load"..........everything else will take care of itself.
exactly right
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Old 02-26-2012, 02:03 PM   #12
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Default Re: degree on driveshaft to pinon angle

i understand what you are saying,but with the info i gave , do i leave it alone, 2 degree positive drivehaft, 0 degree pinion ? motor crankshaft is 2 degree up going at rear end
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Old 02-26-2012, 02:32 PM   #13
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Default Re: degree on driveshaft to pinon angle

If the centerline of the crank points 2 up toward the rear end, then the pinion centerline needs to point 2 down toward the front under load. Because you have a four link, set the static pinion angle at 3-4 down.
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Old 02-26-2012, 03:05 PM   #14
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Default Re: degree on driveshaft to pinon angle

I personally think a 2 degree difference in a 4 link car is not necessary. I doubt if there would ever be that much deflection to compensate for. If it were to happen it would not be for a long period of time , thats why I mentioned just making it the same as the crankshaft angle for ease of understanding.


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Old 02-26-2012, 03:28 PM   #15
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Default Re: degree on driveshaft to pinon angle

Not sure I agree with the crank and the pinion being at the same degree . I also think you need to be sure what type of car he has . Chassis car usually has the pinion close to the height of the crank or higher . Other cars may have the stock floor and not as low which means a higher crank centerline . Obviously the u joints are in place to allow for suspension movement/misalignment or you have an IRS . Also need to think about an auto or stick car as there will be more deflection with the stick . An extreme example would be a 4x4 with the pinion and crank at the same angles but 2 feet apart in height . Personally I would set the pinion angle at 2 degrees on the 4 link and try it .
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