if you adjusted your pinion angle, come in!

[08gt4u]

ill say this again for people to understand.the 0 on the angle finder dosent count for reference when setting pinnion angle.your reference is your drivesahft angle if you have a 2 piece and on a one piece is gonna be the transmission flange.

 

[mrdeath2000]

just stopped at local meineke and used their pit and measured my angles...
Trans +2.1
Pinion from the flange -2.5
from the flat part on pumpkin -.5

from my understanding I'm at .4* pinion angle. However, I thought u-joints were only meant to operate around 3* difference and I'm 4.6*

oh... i have a narly cyclical vibe and constant vibe over 75ish

 

[beefcake]

i keep getting mixed on where to measure this thing?

some say input output shaft, but in the youtube vid for stang tv, they measure where i have the arrows?

so is where i have marked the correct places to measure?

So, I will ask again, am i to measure where i have pictured here on a 1 piece like they did on stang tv or do i measure at the u joint (left arrow) and then at the u joint on the opposite in.

what i have been doing is using the left arrow at say 1 degree pointing towards the ground, and the 2nd arrow pointing say 1 degree towards the ground which gives you minus 2 degrees total,

that is the way they measured on stang tv when they did it?

 

[mrdeath2000]

stang tv was for a two piece.
on a one piece you measure trans flange and pinion flange.

 

[viciousride]

on a one piece you measure trans flange and pinion flange.

I agree; this post from 'SoundGuyDave' makes the most sense...http://www.s197forum.com/forum/showpost.php?p=486804&postcount=139

 

[08gt4u]

the correct way to do it for a 1 piece driveshaft is to put the car on a drive on lift.take out the driveshaft and measure the face of the trans flange then go and measure the face of the pinnion flange and set it to 2 to 3 degrees negative from the trans flange.lock the nuts on the uca and replace driveshaft go for a test drive.what i have found out is that with a 1 piece shaft the pinnion flange is very thin and so is the tranny flange.it is very difficult to get an accurate reading with a 1 piece shaft on.

 

[Fabman]

Well put...

 

[mrdeath2000]

^agree'd.
If your trans is pointed up, how can you lower how much it points up?
Can you put a spacer under motor mounts to raise the engine, lowering the trans flange?
or a spacer under the trans brace so it mounts lower?

Mine points up about 2.1* and i'd like to lower it any bit i can closer to 1* if possible.

 

[08gt4u]

mines points up 2.5 since i run the race stars in the front with a 26 inch tall tire and 27 on the back.
if your trans flange is at 2.1 pointing up(+) then set the pinnion flange to 0.that gives you a 2.1 degrees of negative angle for when you launch the car.

 

[mrdeath2000]

umm, 08gt4u, from my understanding 0 would be putting my pinion flange at -2.1 that would make them paralell. then i need to drop it down to -3.1 for preload.

 

[08gt4u]

no man.if the tranny flange is 2 degrees positive then you set pinnion flange at 0 on the angle finder.this will net you a -2 degrees.forget about doing math on this.all you doing is going a couple of degrees under what the transmision flange is beacuse when you accelerate the pinnion is gonna rotate upwards and will align itself with the transmission flange.
to make it easy set the pinnion flange the same exact as the transmisison flange.once there set the pinnion down(-) 2 to 3 degrees or whatever you want.

 

[Fabman]

no man.if the tranny flange is 2 degrees positive then you set pinnion flange at 0 on the angle finder.this will net you a -2 degrees.forget about doing math on this.all you doing is going a couple of degrees under what the transmision flange is beacuse when you accelerate the pinnion is gonna rotate upwards and will align itself with the transmission flange.
to make it easy set the pinnion flange the same exact as the transmisison flange.once there set the pinnion down(-) 2 to 3 degrees or whatever you want.

Exactly. One note....the tranny flange will be down and the pinion flange will be up....but the same number of degrees. THEN point the Pinion down 2-3 degrees from where it was when it was the same as the trans flange....make sense?

 

[08gt4u]

well that is the idea but my tranny flange has never been pointing down.with all 4 stock tires on the car is at +1 and with the race stars in the front is at +2.5(pointing up)since the car is droped one inch from the front.if i set the pinnion angle the same but negative from the tranny it vibrates like crazy at 75 mph.now once i set the pinnion 2 degrees under what the tranny flange is it vibrates at 105 but if i keep going all i do is move the vibration around to different mphs.i have nver been able to get rid of it.in my car the more positive i go on the tranny flange the better the vibration gets but it gets to a point that when i launch the car the pinnion flange hits the rubber piece on the uca.

 

[mrdeath2000]

yea, im lowered 1.5" so the tranny never points down.
I would like to find a way to shim it so that it would reduce its angle. I am thinking about sticking a washer under my motor mounts to see if it helps lower the trans angle.


the three ways i see to do it are:
1. equal but opposite angles T=+2* P= -2*
2. equal angles T=+2* P=+2*
3. just aim the pinion at the trans flange and let the u-joints handle the rest(what most driveline shops tell me)

all of those are based without any preload. i might just blow my car up and start over... I could live with vibes at 105 until my patience to tackle it would come back

 

[08gt4u]

i feal you bro.i went through the same crap.i even went and got two of my friends stock cars rented a drive on lift and took measurements of there cars.the only thing was both of there cars had the tranny pointing 3 degrees down and mines was up.
i did the #1 that you posted and my car almost felt apart at 80 mph.i can tell and set your pinnion angle really good as long as your tranny flange is 3 degrees down but i cant get it perfect in my own car.
another thing i tought of doing was shimmy the tranny bracket where the mount is to bring it down some degrees and let the weight of the tranny handle the rest but i didnt wanted to mess anything else so i just kept playing with the uca untill i was satisfied.

 

[mrdeath2000]

I found the link I was looking for: http://www.roddingroundtable.com/tech/articles/driveline.html

There is a lot of reading there, just look at the pictures lol. that's what i meant about equal but opposite.
I'll see how my temper is, I may try and shim the trans down with 1 washer on each bolt on the brace. Gotta look and see that it won't hurt the shifter first.

worse case scenerio I could buy some steeda sport springs :/

 

[08gt4u]

with an adjustable uca we can make ours look like both of the pictures.mines is actually set like the first picture dough.

 

[mrdeath2000]

I think I got it figured out... on paper anyway (spent most of my day at work reading this sh1t)
Either picture works paralell opposites, or equal. HOWEVER, the DS angle cant exceed 3*, once it does, the greater the angle the sooner vibrations set in.
So we have to angle ours up to negate the angle on the DS.
Might try to adjust mine tonight and give it a whirl.
Lord help me...

http://www.4crawler.com/4x4/CheapTricks/Driveline-101.shtml#SingleCardan

 

[08gt4u]

lol let me know what you find.

 

[Commbubba19]

just a quick point/question. when you guys are taking your pinion angle measurements, they may be off due to the car itself not being level. i only read the first and last page, but if it hasn't been said before, i'll say it now.

you're only looking for a appx 2* difference between the d/s and the pinion flange. so for example, if the d/s angle is 0. and the pinion flange is down -2*, you have your 2* difference. Like stated above, you want the pinion angle to be (-) because when you launch, the pinion will want to rotate positive.

i just don't want anyone thinking that if they don't have a 0* d/s angle (or whatever alot of people were quoting their angles as being) there is something wrong. the lift/driveway/bricks you have the car sitting on may not have the car completely level. you simply need to focus on the difference between the 2 angles.

i'm lowered 2+" in the back with the stock 2 piece d/s and stock upper uca. I know my pinion angle is off, however i have no vibration issues, no wheel hop, and can pull a 1.9 60ft on street tires.