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Old 06-17-2018, 03:11 PM
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Default pinion angle

Hello all

Well I guess I'll never get through my head, but now is a good time
to rivisit the Pinion angle.
My car is a 62 Ford wagon, I installed my 351c and a 4R70W trans.
The car is sitting on 15" wheels and 27.5" high tires...
What do you think the angle on the trans should be and then
the angle of the drive shaft.
Good time to do this now, is the floor pan is out of the car, so I don't
need to crawl under the car..
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Old 06-17-2018, 04:53 PM
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As you will recall you first start with the vertical angle of the trans flange, lets say 3 degrees declination (down). Because the working angles are what matters we should try to get the axle flange inclination (up) 3 degrees so the working angles are as close to equal as possible. The rest you already know and as a reminder, you can either raise or lower the trans angle or raise or lower the axle angle with tapered shims. Don't forget if you have a slip joint the u-joints must be in phase to prevent vibration.
Sorry, but "You just gotta get under that vehicle to get this done right".


Another way to view this is;
the center line of the trans output shaft should intersect the driveshaft midway between the joint centers in the same place as the extended centerline of the pinion shaft of the axle.
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Old 06-18-2018, 08:00 AM
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Thanks for the refresh... but much easier to do it from insde the car, with no floor pan
then on my back under the car...

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Old 06-18-2018, 01:42 PM
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I was under the impression floor pan was the part of the floor forward of the front seat, but if you can get to the spring seats and rear axle flange from up top, that's cheatin, just kidding. How about some pix when you get a chance, thanks.
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Old 06-19-2018, 05:41 AM
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interesting.. I think the floor pan is the entire floor of a car, not anyone section.
I was going to take some Photo's today.. on the fabrication of the install.
My floor pan was pretty rusted out. found a good pan over in AZ. I drove over to
where it was and had to cut it into 3 pieces to fit it in my Escape..
Now I'm just cutting and fiting the pieces into the wagon.. Took me about 5 hrs
yesterday.. (I'm not a fabricator, nor a welder) but I'm getting it done...
About the pinion angle, this 62 Wagon I pulled out of Nabraska...
I sold the 352 FE and put my 351c in, with a Ford 4R70W trans..
I was going to use a 79 Lincoln rear, but it used control arms and coils
which the 62 did not have, and would require more Fabrication then I could
do at the time. Lincoln has disc... but that's all another story..
Again thanks for the info on the Pinion angle...
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