Pinion angle advice
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Freshman User
Joined: Nov 2011
Posts: 34
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Pinion angle advice
So I have a '69 F100 and I just flipped my rear hangers. I know I need to change my pinion angle. I'm at about 1.5 degrees on the drive line and 23 on the pinion. Any suggestions for an easy fix? The truck is NOT stock. I'm pretty sure I'm looking at about an 18 degree shim which is a lot so throw some ideas at me.
Laughing Gas
Joined: Oct 2013
Posts: 947
Likes: 6
From: Manitoba, Canada
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Are you sure you're measuring in the right places? You don't measure the angle on the drive shaft. You're actually measuring the angle on the output shaft on the tranny and the input shaft on the rearend. You have to put your angle finder on a flat spot on the tranny that is parallel with the out put shaft and same with the rearend. If you were to magically extend the output shaft and the input shaft the two should be perfectly parallel. If you google image pinion angle you'll find lots of info.
If you are out too much to use shims then you'll have to remove and reweld your perches.
If you are out too much to use shims then you'll have to remove and reweld your perches.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
So I have a '69 F100 and I just flipped my rear hangers. I know I need to change my pinion angle. I'm at about 1.5 degrees on the drive line and 23 on the pinion. Any suggestions for an easy fix? The truck is NOT stock. I'm pretty sure I'm looking at about an 18 degree shim which is a lot so throw some ideas at me.
I flipped mine too (full flip on an LB with two-piece driveshaft) and ended up with 12° difference and there was no way I'm gonna stack that many shims. Instead, it's gonna be an axle flip and a C-notch from Fatman Fab... welded.
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Freshman User
Joined: Nov 2011
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Thanks for the inputs. HIO Silver, I also have the LB with the 2 piece driveshaft. As soon as I looked at my angle... 
Found these, cheap and probably a lot simpler in my eyes.
Speedway Weld-On Spring Pad for 3 Inch Axle Tube - Speedway Motors, America's Oldest Speed Shop
Get my angle, weld, and BAM!
Found these, cheap and probably a lot simpler in my eyes.Speedway Weld-On Spring Pad for 3 Inch Axle Tube - Speedway Motors, America's Oldest Speed Shop
Get my angle, weld, and BAM!
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
Thanks for the inputs. HIO Silver, I also have the LB with the 2 piece driveshaft. As soon as I looked at my angle... Found these, cheap and probably a lot simpler in my eyes.
Speedway Weld-On Spring Pad for 3 Inch Axle Tube - Speedway Motors, America's Oldest Speed Shop
Get my angle, weld, and BAM!
Found these, cheap and probably a lot simpler in my eyes.Speedway Weld-On Spring Pad for 3 Inch Axle Tube - Speedway Motors, America's Oldest Speed Shop
Get my angle, weld, and BAM!
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
.. then they'll just be along for the ride.
Here is Fatman's kit in case ya change yer mind. Comes with shock brackets so it can use stock-length shocks.
Here is Fatman's kit in case ya change yer mind. Comes with shock brackets so it can use stock-length shocks.
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Freshman User
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How much did that run you if you don't mind me asking? Not trying to sell an arm and a ******** here 
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Fleet Owner
Joined: Dec 2009
Posts: 20,678
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From: NorCal
One ******** was donated for $525... comes with shocks, shock adapter brackets, the C-notches, the saddles, bump stops, and a butt load of hardware. Well written instructions5 with templates to boot.
I'll just make my own the next go 'round now that I have these as models from which to get dimensions.
I'll just make my own the next go 'round now that I have these as models from which to get dimensions.
Logistics Pro
Joined: Jun 2003
Posts: 3,919
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I must've said it 100 times, measure your pinion angle before making any suspension mods.
I did an axle flip on my short bed w/flexo. Moving the axle to the top of the spring pack did not change the pinion angle. Mine is just about at 5 degrees, upward on the pinion angle.
I did an axle flip on my short bed w/flexo. Moving the axle to the top of the spring pack did not change the pinion angle. Mine is just about at 5 degrees, upward on the pinion angle.
Fleet Owner
Joined: Dec 2009
Posts: 20,678
Likes: 82
From: NorCal
I must've said it 100 times, measure your pinion angle before making any suspension mods.
I did an axle flip on my short bed w/flexo. Moving the axle to the top of the spring pack did not change the pinion angle. Mine is just about at 5 degrees, upward on the pinion angle.
I did an axle flip on my short bed w/flexo. Moving the axle to the top of the spring pack did not change the pinion angle. Mine is just about at 5 degrees, upward on the pinion angle.
Respectfully, the discussion has nothing to do with an axle flip (spring-over) except to note it as a (my) solution.
Elder User
Joined: Dec 2006
Posts: 881
Likes: 1
From: Sudbury, ONT.
I'm in the middle of the same dilemma. I put the DJM lowering kit front and rear. I ended up with a 5 degree difference in my pinion angle. I put two (2) 2.5 degree shims between the springs and rear-end to get it back. I also removed the pins from the centre of the leaf pack. I replaced the pin with a grade 8 bolt that was about 3/4" longer than the pin. The shims I got have a hole in the centre to fit over the pin/bolt. With the longer bolt in place, it goes through the spring pack, both shims, and into the spring pad on the rear-end. It worked well.............for awhile. After a few hard launches, everything seems to have shifted. Now the truck dog tracks and I get a month out of a u-joint. My point is, if you can do it with out shims, that would seem to be the best way.
Hotshot
Joined: Mar 2013
Posts: 14,255
Likes: 199
From: Phoenix, Az.
I'm in the middle of the same dilemma. I put the DJM lowering kit front and rear. I ended up with a 5 degree difference in my pinion angle. I put two (2) 2.5 degree shims between the springs and rear-end to get it back. I also removed the pins from the centre of the leaf pack. I replaced the pin with a grade 8 bolt that was about 3/4" longer than the pin. The shims I got have a hole in the centre to fit over the pin/bolt. With the longer bolt in place, it goes through the spring pack, both shims, and into the spring pad on the rear-end. It worked well.............for awhile. After a few hard launches, everything seems to have shifted. Now the truck dog tracks and I get a month out of a u-joint. My point is, if you can do it with out shims, that would seem to be the best way.