Pinion Angle
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Freshman User
Joined: May 2009
Posts: 32
Likes: 0
From: Santa Fe, TX
Pinion Angle
I know this question has been asked before, I just can't seem to find it. I swapped in a 9 inch out of a 63 f-100 was wondering what the correct pinion angle should be? Running a 302/c4.
Thanks,
Adam
Thanks,
Adam
Lead Driver
Joined: Aug 2006
Posts: 8,093
Likes: 652
From: Brentwood, TN
The engine/trans should be pointed somewhere around 3 degrees downward. Measure the angle at the tailshaft. Take whatever angle measurement at the tailshaft and use this angle for the pinion...only have the pinion pointed up. The easiest way to think about it is that you want the tailshaft and the pinion to be parallel. Lots of charts floating around the net if you need a picture.
Logistics Pro
Joined: Apr 2010
Posts: 3,577
Likes: 29
From: Pekin, IL
not that i want to guinea pig this but how bad can it be when there is a slight angle difference to parallel? the 4X4 boys must eat u-joints weekly!
i am working on my pinion angle too, its really hard to pinpoint what is going to be correct in my case cause there is no wieght from bed,cab, etc. i am gonna have some rake back to front, tire size,etc. but it tough to know exactly
i am working on my pinion angle too, its really hard to pinpoint what is going to be correct in my case cause there is no wieght from bed,cab, etc. i am gonna have some rake back to front, tire size,etc. but it tough to know exactly
Hotshot
Joined: Nov 2000
Posts: 11,591
Likes: 14
From: Pflugerville, tx
not that i want to guinea pig this but how bad can it be when there is a slight angle difference to parallel? the 4X4 boys must eat u-joints weekly!
i am working on my pinion angle too, its really hard to pinpoint what is going to be correct in my case cause there is no wieght from bed,cab, etc. i am gonna have some rake back to front, tire size,etc. but it tough to know exactly
i am working on my pinion angle too, its really hard to pinpoint what is going to be correct in my case cause there is no wieght from bed,cab, etc. i am gonna have some rake back to front, tire size,etc. but it tough to know exactly
sam
Post Fiend
Joined: Mar 2007
Posts: 5,776
Likes: 2
From: springfield il
i got notes from a 79 i parted , a 74 , a 70 a 56 , two 55's and my 1 ton 55 and my baby the 53 and all were at 4degrees according to what i got down in frony of me . 4 degrees up that is ............................ when i put the 53 back together and lowered it'll be reset there .
Cargo Master
Joined: Feb 2008
Posts: 2,793
Likes: 128
From: Windermere Valley,B.C. Ca
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Welder User
Joined: Feb 2009
Posts: 5,269
Likes: 50
From: northwest MT
The actual degree number doesn't really matter as long as the pinion shaft and the trans output shaft are on the same plane......in other words, parallel.
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Elder User
Joined: Jan 2007
Posts: 789
Likes: 2
From: MI..."near" Dearborn...
Driveline PHASING....
..sweet...thats is what I'm working with......for now...unless somebody happens to leave an AOD on my front
porch...
......until then I'm gonna keep pluggin' away to make it work with the
3.89 Trac-Loc in a FRANKENINE (nick-name for this PITA) rear-end
pulled out of a wrecked '70 F100 along with the original C4...and
topped-off with a vintage '63 Buddy Barr/Holley SBF tri power...
...C-4 ratios are: 2.46:1, 1.46:1 and 1.00:1… reverse is 2.19:1
Sooooo...with a 3.89 ring & pinion...and 15" tire/wheel combo
around 28" diameter I figured I'll be spinning right around
3268 rpm at 70- mph...
...ouch...DRIVELINE PHASING......
https://www.ford-trucks.com/forums/850854-setting-pinion-angle-2.html
Look at the diagrams in post #19...clear things right up...
...Thought this might help...
...-
Elder User
Joined: Jun 2010
Posts: 934
Likes: 2
From: Sterling, Virginia
Three degrees is what I did and it works fine. Don't sweat it too much cause you can always get a wedge to put between the rear axle and the spring to fine tune it once the the body is on. Many suppliers sell these shims in degree incriments.
old and in the way
Joined: Jul 1997
Posts: 5,910
Likes: 1,042
From: Lovely Hueytown Alabama
Posting Guru
Joined: May 2010
Posts: 2,068
Likes: 7
From: Moyie, BC Canada
For pinion and transmission placement You have the best drawings and explanations for this task on this site..
mervy
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