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Old 05-15-2013, 07:06 PM
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Pinion angle help please

Hey everyone,

Trying to set my angels up on my truck.
Its a 58 Chevy PU leaf springs, Volare front end and Caltracs.
About 420HP + 125 shot of NOS

The trans is currently at 5 degrees, Drive line is at 4.9 degrees and the rear end is at -.1 degrees. (drive shaft end pointed down)

Should I take care of the 5 degree engine tilt first? Or can I just throw in a set of 3% shims in the rear and call it good? Caltrac reccomend 2-4 degrees pinion angle. But I have read so much stuff im even more confused now.

Thanks

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Old 05-15-2013, 08:07 PM
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This has been discussed at length on here and a search of the forum for pinion angle should help you with what you need to know with diagrams also and pay attenion to what you will be using the car for , street/ strip or both.
I can say 3 down on tranny and 3 up on pinion is about right. For dragging you may want to keep the pinion down another degree as it will climb when under torque and will even out. The engine centerline must be parrellel to the pinion centerline front to rear. U joints must be in phase.The angle of the driveshaft may be irrelavent. But, I am not an expert and others may be better experienced to help you.
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Old 05-15-2013, 08:15 PM
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3 to 5 degrees down on the tranny is normal. It's set up that way so your carb is level. Here's a link for you.
Pinion angle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network
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Old 05-15-2013, 08:29 PM
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I have done some more looking and yeah, it seems 3-5 is fairly common on the transmission. So If I add 5 degrees to the rear end this is going to make the driveline parallel too the U-joints and will wear out the u-joints due to lack of lubrication?

It seems my only option is to take a couple degrees out of the transmission end correct?
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Old 05-15-2013, 09:34 PM
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[QUOTE=xxllmm4;1675978 It seems my only option is to take a couple degrees out of the transmission end correct?[/QUOTE]

Nope, you want them to both be set at 5*, just not directly in line with each other. That is to say if you drew an imaginary line thru the trans towards the pumpkin', and another line thru the pinion towards the trans these two lines would be parallel to each other and I would guess between 1" to 4" apart.
Want to read some more?

http://www.iedls.com/asp/admin/getFi...&TID=28&FN=PDF
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Old 05-15-2013, 09:58 PM
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Ok, I think I got it....

Say the transmission is set at 5 degrees, set the rear end at 5 degrees. The only problem is the driveline is now also at 5 degrees. My understanding is u-joints need at at least 1/2 degree or they will not be lubricated properly.

However according to http://www.iedls.com/asp/admin/getFi...&TID=28&FN=PDF page 6 when angles approach zero u-joint life is not affected because of pinion offset.


Edit, it looks like they come in 4 and 6 degree, what one would I want?

Last edited by xxllmm4; 05-15-2013 at 10:06 PM.
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Old 05-15-2013, 10:23 PM
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Quote:
Originally Posted by xxllmm4 View Post
Ok, I think I got it....

Say the transmission is set at 5 degrees, set the rear end at 5 degrees. The only problem is the driveline is now also at 5 degrees. My understanding is u-joints need at at least 1/2 degree or they will not be lubricated properly.

However according to http://www.iedls.com/asp/admin/getFi...&TID=28&FN=PDF page 6 when angles approach zero u-joint life is not affected because of pinion offset.


Edit, it looks like they come in 4 and 6 degree, what one would I want?
Not quite yet. Pg 3 figure 4 is a good illustration of what I tried to explain. If you look at it and imagine a drive shaft between the trans and pinion you'll see that the drive shaft itself is not at 5* but at an angle I'm too tired to try and figure out. Depending on how close or far apart those parallel lines are effects the drive shaft static angle. On pg 4 read the paragraph about placing a straw between your fingers. After you try it with your fingers straight up and down try tipping both fingers to 5* ( in the same direction, so their parallel) and do the same thing. It is this offset of angles that keep the bearings in the U-joints rolling and lubricated. Good Night!
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Old 05-16-2013, 11:20 PM
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I'm going with degree blocks, after the rear end is raised a little with the blocks there should be about 1/2 degree in the drive line. Thats the minimum recommended by some U-joint manufactures.

I figure 5 degrees on the trans and 4 degrees on the rear end should be about right for a mostly street some strip use rig. Pinion angle
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Old 05-17-2013, 09:10 AM
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When the carb is level the trans shaft will be at 3* down, if you have leaf springs, set the pinion at 0* to 1.5 * up. Under a load it will be around 3* up and should work fine... If your planning on doing ladder bars or 4-link, Set the pinion at 3* up.
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Old 05-17-2013, 09:13 AM
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Quote:
Originally Posted by xxllmm4 View Post
I'm going with degree blocks, after the rear end is raised a little with the blocks there should be about 1/2 degree in the drive line. Thats the minimum recommended by some U-joint manufactures.

I figure 5 degrees on the trans and 4 degrees on the rear end should be about right for a mostly street some strip use rig. Pinion angle
if your at 5* set the pinion at around 3*up...
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Old 05-18-2013, 10:19 PM
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Just found this video on a Jeep forum. Pretty cool stuff, eh!

http://www.youtube.com/watch?feature...&v=xgQgm3GwaFs
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