Trans Shaft Pinion Angle & the Rearends Pinion Angle - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #1 of 24 (permalink) Old Jul 31st, 20, 5:56 PM Thread Starter
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Greg.
 
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Trans Shaft Pinion Angle & the Rearends Pinion Angle

Had my Racer Mechanic Measure the above for me on his Alignment Host with the Car on all 4 Wheels

Just wondering what your guys thoughts are on the Results ;

FRONT Trans Shaft Angle = 0*
What does this mean in Relation to the old thoughts of that they should be Opposite

REAR Pinion Angle = - 4* aka Pointing Down
I think this is good as when I Launch the Rearend will Rotate upwards putting the Angle at - 2* or less(-1*)

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #2 of 24 (permalink) Old Jul 31st, 20, 6:38 PM
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Hey if it means anything my angles are +1 up front and -3 out back. Saying that, I have a new rear end on the way.....
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post #3 of 24 (permalink) Old Jul 31st, 20, 6:42 PM
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Cody
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Is this the isolated angle of each component or their operating angles with relation to the driveshaft? What do you have for a transmission mount, and how old is it? I believe you want something other than 0* for an operating angle for U-joint life, otherwise the needles won't rotate.
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post #4 of 24 (permalink) Old Jul 31st, 20, 8:00 PM Thread Starter
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Greg.
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

The U Joints & ALL the Rear Suspension Grease-able Poly Bushings are around 6 years old
and the Short Rubber Trans Mount was just Changed out in 2019

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #5 of 24 (permalink) Old Jul 31st, 20, 10:12 PM
Rick
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Down load the Tremec tool box app to your phone, you can use it to measure the angles and it will pass/fail the setup.
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post #6 of 24 (permalink) Old Jul 31st, 20, 11:55 PM
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

What angle is the driveshaft at?
David Bates and -SS454- like this.

Tighten it till it strips and back it off a quarter turn.
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post #7 of 24 (permalink) Old Aug 1st, 20, 8:29 AM
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by Alwhite00 View Post
What angle is the driveshaft at?
^^^ This!

You need to know this to calculate the working angles which is what really matters.
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post #8 of 24 (permalink) Old Aug 1st, 20, 9:55 AM
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by Kirk's67SS View Post
FRONT Trans Shaft Angle = 0*
Transmissions are NEVER at 0* so why is yours? Something doesn't sound right?
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post #9 of 24 (permalink) Old Aug 1st, 20, 8:57 PM Thread Starter
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by sz0k30 View Post
Transmissions are NEVER at 0* so why is yours? Something doesn't sound right?
As you know every car is different for Wheel/Tires / Space in the Tunnel for Later 4 Speed Auto Trans / etc

When I Swapped in the Short Water Pump BBC from a SBC we had to move the Frame Brackets back 1" to 2"
so there would be enough Room for the Efan SetUp and to make sure the Dist would not Rub/Hit the Firewall



So I would think Moving the Engine Rearward likely had an effect on the Angle it and the Trans sits on

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #10 of 24 (permalink) Old Aug 2nd, 20, 8:33 AM
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Jeff
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

If you moved the frame mounts back 1"-2", that's going to put the distributor closer to the firewall
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post #11 of 24 (permalink) Old Aug 2nd, 20, 11:21 AM Thread Starter
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Greg.
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by nitrofox View Post
If you moved the frame mounts back 1"-2", that's going to put the distributor closer to the firewall
Yes it did but we made sure there was enough room


67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #12 of 24 (permalink) Old Aug 2nd, 20, 12:42 PM
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So with all this being said, isn’t it irrelevant what position the motor is in? What is The optimal driveshaft angle, pinion angle, and trans angle? I would think that the optimal number would be attainable with washers/shims/ and or brackets regardless of the motors front to rear orientation.

I personally would go +3* at the trans output side of the drive shaft,
and -3* at the rearrange pinion side of the drive shaft. I would think that if those angles are correct, actual driveshaft angle would be a byproduct. I’m sure someone with more experience could shed some more light, that’s just Makes sence to me
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post #13 of 24 (permalink) Old Aug 2nd, 20, 1:49 PM Thread Starter
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by 71malibuu View Post
So with all this being said, isn’t it irrelevant what position the motor is in? What is The optimal driveshaft angle, pinion angle, and trans angle? I would think that the optimal number would be attainable with washers/shims/ and or brackets regardless of the motors front to rear orientation.

I personally would go +3* at the trans output side of the drive shaft,
and -3* at the rearrange pinion side of the drive shaft. I would think that if those angles are correct, actual driveshaft angle would be a byproduct. I’m sure someone with more experience could shed some more light, that’s just Makes sence to me
My understanding is the further forward the Engine is the more of a Downward Angle the Rear of it is

Therefore by moving the Engine Rearward in the Engine Bay there is less of a Downward Angle
and therefore when the Trans is attached to the Engine there is less of a angle

Another thing to Note is that Intakes are usually Higher at the Back of them so the Carb will sit Flat
because of the Engine is usually lower at the Rear/Firewall

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph


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post #14 of 24 (permalink) Old Aug 2nd, 20, 3:26 PM
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Chris
 
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Measuring any angle without measuring the driveshaft is useless IMO. I've heard from so many "old school" car guys how they checked the pinion angle and that's it, not even checking the driveshaft.

Ideally the operating angles at the trans will be equal and opposite to the pinion, with a minimum of 1* to allow the U joints to rotate.

1971 Chevelle SS454, T56 Magnum 6 speed, 3.31 Posi

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post #15 of 24 (permalink) Old Aug 2nd, 20, 6:57 PM
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Re: Trans Shaft Pinion Angle & the Rearends Pinion Angle

Quote:
Originally Posted by 71malibuu View Post
So with all this being said, isn’t it irrelevant what position the motor is in? What is The optimal driveshaft angle, pinion angle, and trans angle? I would think that the optimal number would be attainable with washers/shims/ and or brackets regardless of the motors front to rear orientation.

I personally would go +3* at the trans output side of the drive shaft,
and -3* at the rearrange pinion side of the drive shaft. I would think that if those angles are correct, actual driveshaft angle would be a byproduct. I’m sure someone with more experience could shed some more light, that’s just Makes sence to me
Or you could be like me and the driveshaft is running uphill to the rear end. This compounds the u joint angles and nothing you can do. You definitely need the driveshaft angle in order to see what you are up against.

Tighten it till it strips and back it off a quarter turn.
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