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Old 01-06-2015, 04:49 PM   #1
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Driveshaft Swap

So I managed to snag a 1 piece finally. I'm going to wait until I get the DS Loop and Upper control arm to install it, but I did have a question regarding the pinion angle.

Since my car is only dropped about 1 inch all the way around, does anyone happen to know the proper pinion angle for that? Or know of a good method to find the angle?

Not too familiar with it, I figured I could buy an angle finder but I don't know the process.

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Old 01-06-2015, 05:11 PM   #2
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Sent an email to kelly regarding this same question just yesterday. For automatics he stated that the pinion angle on an automatic should be 1-2 degress negative. Manuals should be about 3-4 nevative i believe.

Android market has a good app "lever" which is pretty useful in measuring the transmission angle and angle from the flange of the driveshaft.

Bmr has a good video and manual on there website regarding the angle ect
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Old 01-06-2015, 05:15 PM   #3
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Quote:
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Sent an email to kelly regarding this same question just yesterday. For automatics he stated that the pinion angle on an automatic should be 1-2 degress negative. Manuals should be about 3-4 nevative i believe.

Android market has a good app "lever" which is pretty useful in measuring the transmission angle and angle from the flange of the driveshaft.

Bmr has a good video and manual on there website regarding the angle ect
Sweet, I'll check them out. Much appreciated.

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Old 01-28-2015, 01:39 PM   #4
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What I'm wondering is it really necessary to worry about pinion angle on cars with 1-piece driveshafts, especially with only a 1" drop.

Here's my reasoning...


The "triangle" or angle for pinion before (top/black) was from the mid-point of the 2-piece driveshaft where there was loop holding the middle in place. If you change the start of the triangle to a length roughly twice as long with a 1-piece DS (bottom/green), the angle should only be about 1/2 as much.

So normally when you drop the car 1" lets say it might change the angle 3 degrees, well when you drop the car 1" with a 1-piece driveshaft the change should only be about 1.5 degrees (or half). RIGHT ?
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Old 01-28-2015, 01:52 PM   #5
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The most important part of the pinion angle is that the rear axle and the transmission are directly facing each other. Just like the picture above, imagine one ned of the green line is the transmission and the other end is the rear axle.
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Old 01-28-2015, 02:03 PM   #6
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I asked the same question of my stepdad who used to drive pro mod for several years and now has his own shop along with my brother and his shop and the consensus of people tell me a 1" drop will change the angle but by such a small amount it's negligble.

That being said, I just got my digital angle finder in and I'll take readings before/after just to be safe.

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Old 01-28-2015, 08:51 PM   #7
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Quote:
Originally Posted by c_rizzle View Post
What I'm wondering is it really necessary to worry about pinion angle on cars with 1-piece driveshafts, especially with only a 1" drop.

Here's my reasoning...


The "triangle" or angle for pinion before (top/black) was from the mid-point of the 2-piece driveshaft where there was loop holding the middle in place. If you change the start of the triangle to a length roughly twice as long with a 1-piece DS (bottom/green), the angle should only be about 1/2 as much.

So normally when you drop the car 1" lets say it might change the angle 3 degrees, well when you drop the car 1" with a 1-piece driveshaft the change should only be about 1.5 degrees (or half). RIGHT ?

Aside from just angles that can affect NVH and cause the "vibration" when not aligned properly, the load on the pinion flange also increases and you can prematurely wear out a lot of parts in the rear end if its not aligned properly.
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Old 01-28-2015, 10:35 PM   #8
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Is a UCA mount as important as I've heard when adding an adjustable UCA?


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Old 01-29-2015, 12:40 AM   #9
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Is a UCA mount as important as I've heard when adding an adjustable UCA?


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Yep. Without it you'll get that hard clunk and the alignment may be slightly off.

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Old 01-29-2015, 01:38 AM   #10
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Yeah, I regret not getting a new mount with my UCA. Living with that clunk for some time now haha. Alignment is perfect though
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