Pinion Angle

Joeymartin7

Joeymartin7

Not-quite-so-new-guy
Oct 21, 2018
7
11
3
Henderson County, Texas
#1
I have a 1980 El Camino with a crate 350, TH350 and 7.5 10 bolt.
I broke the Pinion gear over the past weekend and I am going to go ahead and do the Ford 9" rear end swap.

Question???
What is the correct Pinion Angle for this car?

First time G Body owner needing some advice.

I know on my old Mustangs, I would set it at -7 degrees per Ford.

Any help would be greatly appreciated.

Also, anyone know anywhere that sells full complete G Body Ford 9's?
If I cant find a complete set up ready to go I will be getting all of the parts individually form Day Motorsports in Tyler TX at a pretty penny.

Thanks,
Joey
 
TURNA

TURNA

Geezer
Jul 24, 2009
6,326
8,011
113
Socialist NY
#2
I believe it is -4 degrees at the yoke.......standby while i look it up.............
 
TURNA

TURNA

Geezer
Jul 24, 2009
6,326
8,011
113
Socialist NY
#3
superbon54

superbon54

Greasemonkey
Apr 15, 2014
136
265
43
#4
If you’re asking about correct angle, I assume you’re going to use adjustable arms? If so, the best way to set angle will be to measure the angle of the transmission output shaft (on a level surface!) and set the pinion opposite of that.

Depending on how you drive and variables like bushing types, motor or trans swaps, etc the angle may be increased slightly.

Using the stock angle is the quick way, but may result in vibration or future u joint issues.
 
Joeymartin7

Joeymartin7

Not-quite-so-new-guy
Oct 21, 2018
7
11
3
Henderson County, Texas
#5
yes, i am planning on getting adjustable arms as well. i am assuming that i will also have to either get my drive shaft shortened or get a custom length shaft.
it has a TH350 in it now
 
TURNA

TURNA

Geezer
Jul 24, 2009
6,326
8,011
113
Socialist NY
#6
Shaft should pop right in just need a U joint to match the 9" yoke
 
Joeymartin7

Joeymartin7

Not-quite-so-new-guy
Oct 21, 2018
7
11
3
Henderson County, Texas
#8
I say that was a gear problem moreso than pinion angle. I always thought incorrect pinion angle caused u-joint/driveshaft problems, not gear failures.
it was a gear problem. it had 3.23 thick gears in it and the c clips twisted when i hooked up and broke the pinion gear.
not wanting to fix this 7.5 just to break it again with slicks.
going to get a 9 inch so i know it will handle the power with slicks.
just trying to gather as much info on the swap as i can.
i know i am going to get adjustable control arms and get rid of the air shocks and go with some qa1 shocks.
 
Northernregal

Northernregal

G-Body Guru
Oct 24, 2017
541
1,510
93
Red Deer AB
#9
Quick performance makes a nice ford 9 for a G body. Pick your pleasure and it shows on the FedEx truck like a week or so later. 👍
20181214_174457-jpg.105145
 
B

bracketchev1221

Master Mechanic
Jan 18, 2018
312
280
43
#10
2-3 degrees down to the driveshaft angle for a 4 link car. So like John was showing, its based on the driveshaft angle down and the difference between the 2. Optimally when the car is driving, the transmission angle equals the pinion, and there is a slight angle between the driveshaft and yokes to load the needles.
 

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