How do you check/set pinion angle? - Ford Mustang Forum
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post #1 of 26 (permalink) Old 04-06-2008 Thread Starter
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How do you check/set pinion angle?

I've been curious about this for some time. I have an adjustable UCA, so I know I can do this. What is needed to do the adjustment and make sure you are at the correct setting? If I can figure this out, I'll install my driveshaft myself and save myself about $200.

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post #2 of 26 (permalink) Old 04-06-2008
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Here's a decent read BaselineSuspensions.com.........Setting Pinion Angle

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post #3 of 26 (permalink) Old 04-06-2008
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Quote:
Originally Posted by stlwagon View Post

Nice find Mark, that sure would have saved me money when I swapped my driveshaft out.

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post #4 of 26 (permalink) Old 04-06-2008
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The search engine is my friend!

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post #5 of 26 (permalink) Old 04-06-2008 Thread Starter
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Sweet!! That's definitely not how I thought it was found.

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post #6 of 26 (permalink) Old 04-06-2008
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The article doesn't seem vehicle specific. Is the pinion angle the same on most vehicles or are we looking for a specific value/angle on S197 Mustang GT's?

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post #7 of 26 (permalink) Old 04-06-2008
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For a street/part-time track car a -1* to -2* angle is good. For a full-time track car -3* to -4* is better.

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post #8 of 26 (permalink) Old 04-06-2008
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For a street/part-time track car a -1* to -2* angle is good. For a full-time track car -3* to -4* is better.
Cool thanks. Any idea how far off the pinion angle is on lowered mustangs (average).

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post #9 of 26 (permalink) Old 04-06-2008
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After lowering, mine was basicly at 0.

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One big source of confusion is always what you're measuring against, and why you're doing it.

The goal here is to have the pinion and the drive angle exactly the same during acceleration. For every degree that it's not the same, you lose power.

Remember that the drive line angle is the angle of the engine crankshaft/transmission main shaft. Not the drive shaft.

Under power, the pinion will rotate upward, as the front of the tires move downward. So, depending on your set up, you have to guess about how much the pinion will rotate. Baseline Suspensions provides some good guesses towards the top of the page, in red lettering.

OK, here's the tricky part. DO NOT measure the pinion angle against the horizon/ground. You measure it against the drive line (not drive shaft) angle. The driveline angle (AKA Power Angle) is usually 4-5*. It's easy to measure on the front of the harmonic balancer. The front of the engine points up.

Under acceleration, the front of the pinion should also point up the exact same amount - say 5*

For a stock suspension, expect the pinion to rotate up about 3-4*. That means the front of the pinion should point up 1-2* at rest. Under power, it will increase by 3-4*, and that gives you the recommended 4-5*. Which equals a 0* pinion angle.

Confused? Draw it out on a piece of paper, and it makes more sense.

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post #11 of 26 (permalink) Old 04-06-2008 Thread Starter
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Does lowering the car affect how the angle should be set in relation to having a one-piece driveshaft? I figured -2* would be fine, but is this different because my car is lowered?

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Quote:
Originally Posted by bigwilly43729 View Post
Does lowering the car affect how the angle should be set in relation to having a one-piece driveshaft? I figured -2* would be fine, but is this different because my car is lowered?
You'll need to play with the angle to ensure you have tunnel clearance. Will also need to ensure it clears your safety loop.

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I really can't see getting that much axle rotation (5 degrees)with a coil spring suspension with control arms. With a leaf spring car and alot of spring wind up, I would say yes.

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Quote:
Originally Posted by .boB View Post
One big source of confusion is always what you're measuring against, and why you're doing it.

The goal here is to have the pinion and the drive angle exactly the same during acceleration. For every degree that it's not the same, you lose power.

Remember that the drive line angle is the angle of the engine crankshaft/transmission main shaft. Not the drive shaft.

Under power, the pinion will rotate upward, as the front of the tires move downward. So, depending on your set up, you have to guess about how much the pinion will rotate. Baseline Suspensions provides some good guesses towards the top of the page, in red lettering.

OK, here's the tricky part. DO NOT measure the pinion angle against the horizon/ground. You measure it against the drive line (not drive shaft) angle. The driveline angle (AKA Power Angle) is usually 4-5*. It's easy to measure on the front of the harmonic balancer. The front of the engine points up.

Under acceleration, the front of the pinion should also point up the exact same amount - say 5*

For a stock suspension, expect the pinion to rotate up about 3-4*. That means the front of the pinion should point up 1-2* at rest. Under power, it will increase by 3-4*, and that gives you the recommended 4-5*. Which equals a 0* pinion angle.

Confused? Draw it out on a piece of paper, and it makes more sense.
I need a Tylenol already

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All the diagrams for setting pinion angle show a U-joint between the drive shaft and rearend, my 07 GT doesn't have one. The shaft is bolted to the rearend. So where do I check for the angle?

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