Pinion angle experts chime in! - Page 2 - Vintage Mustang Forums

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post #16 of 24 (permalink) Old 03-10-2014, 01:11 PM
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Just wanted to clear this up as I know most drag cars the pinion is angled down towards the ground when installed.
With the axle on jack stands and the pads perfectly level on top of the tube. The original 8" pinion is facing down to the ground 5 degrees.
That would mean when installed on the car assuming the pads are level which they are not, the pinion would be facing 5 degrees up towards the sky.
Correct?
Sorry for the bad diagram in paint but just wanted some clarification
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1967 Ford Mustang (under construction)
Engine- 347 stroker, 10.5:1, aluminum heads
Drivetrain- T-5 trans, 8.8 explorer rear
Suspension-620 springs, 5 leafs, front+rear sway bars
Brakes- 4 wheel disc
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1999 Saturn sl2 5 speed (110hp monster)
1999 Suzuki Bandit 1200 (custom frame streetfighter)
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post #17 of 24 (permalink) Old 03-10-2014, 03:10 PM
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Hmm, I welded mine in up position on jack stands, no issues..don't think it's gonna rotate from 5 down to 5 up just by putting weight on car, could b wrong there, but mine has been flawless, no vibrations

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post #18 of 24 (permalink) Old 03-10-2014, 09:09 PM
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Quote:
Originally Posted by Chris21 View Post
Just wanted to clear this up as I know most drag cars the pinion is angled down towards the ground when installed.
With the axle on jack stands and the pads perfectly level on top of the tube. The original 8" pinion is facing down to the ground 5 degrees.
That would mean when installed on the car assuming the pads are level which they are not, the pinion would be facing 5 degrees up towards the sky.
Correct?
Sorry for the bad diagram in paint but just wanted some clarification
you should be measuring with respect to the driveshaft when it's installed in the car at the ride height of interest.
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post #19 of 24 (permalink) Old 03-12-2014, 07:31 PM
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I have done 2 for my car. The first one was set the same as the original rear end. It seemed to work fine with a good amount of power, around 500rwhp. I set the stock rear end upside down on jack stands with a scissor jack under the pinion. that made small adjustment easy. Leveled the pads and measured the pinion angle. Set the 8.8 up the same way at the same angle and used a level to get the pads level and welded.

The second one was setup for a lot more power and Caltracs with the pinion lowered 5*. It seems to do fine on the interstate with no vibration.

67 coupe Turbo Blow-thru 351w, C4, 8.8 http://www.cardomain.com/ride/2435094
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post #20 of 24 (permalink) Old 03-13-2014, 12:43 PM
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Well the original 8" is set at 5 degrees up. (5 degrees down when upside down) I always thought they should be down.
I can't measure the driveshaft as the engine and trans aren't ready to be installed yet. Any slight changes I will correct with shims. Once correct I will tack the shims in place.

1967 Ford Mustang (under construction)
Engine- 347 stroker, 10.5:1, aluminum heads
Drivetrain- T-5 trans, 8.8 explorer rear
Suspension-620 springs, 5 leafs, front+rear sway bars
Brakes- 4 wheel disc
Daily driver
1999 Saturn sl2 5 speed (110hp monster)
1999 Suzuki Bandit 1200 (custom frame streetfighter)
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post #21 of 24 (permalink) Old 03-13-2014, 12:47 PM
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wonder if you can use a stock rear sway bar with the 8.8?
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post #22 of 24 (permalink) Old 03-13-2014, 12:51 PM
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I have an addco 3/4 sway installed. It will work but I have to trim the new leaf pads as there a longer anti wrap design.
Side note I don't like the u bolt design in the frame rails that addco uses. Was a pain lining the holes up to drill.

1967 Ford Mustang (under construction)
Engine- 347 stroker, 10.5:1, aluminum heads
Drivetrain- T-5 trans, 8.8 explorer rear
Suspension-620 springs, 5 leafs, front+rear sway bars
Brakes- 4 wheel disc
Daily driver
1999 Saturn sl2 5 speed (110hp monster)
1999 Suzuki Bandit 1200 (custom frame streetfighter)
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post #23 of 24 (permalink) Old 05-16-2017, 11:22 PM
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1966 mustang vibration c 4 trans. Replaced third member with a professionally rebuilt one.
Replaced trans output shaft bushing, new rear drums, rebuilt and balanced driveshaft but used old trans yoke, new
Crager wheels and balanced on Hunter Road Force machine. Need your opinion on the pinion angle.
With rockers level and weight on all wheels pinion angle is zero from level,90*. Driveshaft angle 3* from level,
93*. Trans output 5* from level, 95*. Calculated pinon angle,90* - 93* = -3*. Trans angle 95*- 93*= +2*.
This gets me a 1* differential. This difference looks acceptable to me. How does this look to you? Am I reading this wrong?

Regards,
Dennis
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post #24 of 24 (permalink) Old 05-17-2017, 08:18 AM
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Rather than resurrect a 3 year old thread, you might want to start a new one...
SWPruett and Huntingky like this.

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