how does my pinion angle look??
Great Link Tim
#32
11-29-2004, 04:52 PM
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Guys...
I know alot about this subject and have made plenty of good posts about it, try a search if you want pics of parts and stuff.
You have WAY POSITIVE in your picture..... You really want it to look about that angle on the downside for a street truck. I dont care what ANYONE tells you, axle wrap on a leaf spring will happen.
Ever wonder how I got 1.59-1.61 60 foots on a stock convertor? Its all in the suspension.
-3 is about right on a street truck, -5 is for MAXIMUM traction but I would tell someone who drives thier truck alot to set it up like that, it will wear out your u-joints faster.
If you leave it like that, you will break your driveshaft on a hard hooking launch. Been there done that.....
I know alot about this subject and have made plenty of good posts about it, try a search if you want pics of parts and stuff.
You have WAY POSITIVE in your picture..... You really want it to look about that angle on the downside for a street truck. I dont care what ANYONE tells you, axle wrap on a leaf spring will happen.
Ever wonder how I got 1.59-1.61 60 foots on a stock convertor? Its all in the suspension.
-3 is about right on a street truck, -5 is for MAXIMUM traction but I would tell someone who drives thier truck alot to set it up like that, it will wear out your u-joints faster.
If you leave it like that, you will break your driveshaft on a hard hooking launch. Been there done that.....
#33
11-29-2004, 04:53 PM
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Originally posted by LightningTuner
You'd be surprised at how many people have no idea that improper pinion angle is causing them major traction issues. I used to be one of them. My truck used to immediately blow the tires off on launch no matter what I did or tried. After talking to a few suspension gurus, I was told to check the pinion angle and found it to be only -1, which told me it was going positive on launch. Adding in some -3 shims put me at -4, and now the truck pulls the wheels.
You'd be surprised at how many people have no idea that improper pinion angle is causing them major traction issues. I used to be one of them. My truck used to immediately blow the tires off on launch no matter what I did or tried. After talking to a few suspension gurus, I was told to check the pinion angle and found it to be only -1, which told me it was going positive on launch. Adding in some -3 shims put me at -4, and now the truck pulls the wheels.
I remember those talks....
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11-29-2004, 04:57 PM
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11-29-2004, 06:09 PM
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#39
11-29-2004, 06:33 PM
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#40
11-29-2004, 06:34 PM
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Originally posted by svt_2004
ok here it is, i measured at the rear end (on the tail stock part) it read 90 degrees
and i measured on the actual driveshaft and it measured +3 close to + 4
so i have to get it down to -3 ????
is that alot to move it??
will i need major shims?
ok here it is, i measured at the rear end (on the tail stock part) it read 90 degrees
and i measured on the actual driveshaft and it measured +3 close to + 4
so i have to get it down to -3 ????
is that alot to move it??
will i need major shims?
I have nothing to offer except the fact that I'm now paranoid that my 3" drop has me out of whack. Sal did tune my ECM though, so at least only drivetrain metal will fly
#42
11-29-2004, 06:35 PM
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#43
11-29-2004, 06:35 PM
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Originally posted by svt_2004
ok here it is, i measured at the rear end (on the tail stock part) it read 90 degrees
and i measured on the actual driveshaft and it measured +3 close to + 4
so i have to get it down to -3 ????
is that alot to move it??
will i need major shims?
ok here it is, i measured at the rear end (on the tail stock part) it read 90 degrees
and i measured on the actual driveshaft and it measured +3 close to + 4
so i have to get it down to -3 ????
is that alot to move it??
will i need major shims?
When I dropped my truck I had 7 Deg of shims installed. I had a 4deg shim and a 3 deg shim. They dont like you to stack shims but I had them on for 1000's of passes with no problems. If you cant find the parts I could get you what you need.
Sounds like you will need two shims unless you want to have a pro shop cut and reweld spring perches on the rear....
#44
11-29-2004, 06:42 PM
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Here are some pictures....
https://www.f150online.com/forums/sh...ighlight=shims
What you need is the following:
Biggest Pinion Angle Shims you can find, 4 or 6 shims I think is the biggest. I would get a 4 and a 3...
New Leaf Spring center bolts with extension washers.
If you go to a 4x4, Spring shop, speed shop, or something like that they will have it all.
This is a VERY OLD SCHOOL traction mod.... THAT WORKS!
https://www.f150online.com/forums/sh...ighlight=shims
What you need is the following:
Biggest Pinion Angle Shims you can find, 4 or 6 shims I think is the biggest. I would get a 4 and a 3...
New Leaf Spring center bolts with extension washers.
If you go to a 4x4, Spring shop, speed shop, or something like that they will have it all.
This is a VERY OLD SCHOOL traction mod.... THAT WORKS!
#45
11-29-2004, 06:53 PM
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