Set it at 3 and see how that works for you. That should take care of it.

CR
Tillman Speed
610-497-3711

 

And that's -3 off the pinion flange right? Here's the deal: I measured my transmission flange and it is at +1.5. Today when we went to adjust the pinion angle the pinion flange off the carrier was +1.5 also. We adjusted the UCA so that it was -0.5. I am still getting a vibration at 80+ mph. Should I shim the transmission up to 0 then set the pinion angle in the rear at -3 or 0? I read somewhere that the angles should be equal meaning if trans is +1 then pinion should be -1. I spoke with J&P Performance who did the R&D for Denny's and they said to set the pinion angle between 0 and -1. I did and still vibration. My install was ultra clean. Should I adjust the pinion angle to -3 and if that doesn
t work then assume the driveshaft is out of balance??? Tillman, Help me please!!!

 

 

We have had no problems with the +/- 3 combination (at least on the Coast driveshafts that we sell). That is what I'm reccommending. I have NO idea why they would say between 0 and 1? I know alot of guys try and get more "bite" out of their launches and have some cool tricks like that, but there's no way in hell that for a daily driver that I would set this particular application at 0-1 degrees.

Pinion angles should match, this is correct. -2.7 to -3 pinion with a matching plus angle on the opposite side of the driveshaft will be ideal.

I hope this helps! Good luck, and let me know if the problem goes away. If it doesn't, and you've exhausted all pinion angle combinations, then we can assume the driveshaft is a paperweight, and needs to be rebalanced. Again though, the Steel driveshaft is going to make more noise than an aluminum driveshaft, especially without the teflon coating mentioned in my above post. This is neccessary to keep the driveline noise to a minimum.

GOOD LUCK! Let me know if you have absolutely any other questions or concerns!! I'm available PM, Email, Phone, or just reply here and I'll get around to it!

CR
Tillman Speed
610-497-3711

 

CR,
To get the above that is underlined, how would you adjust the transmission flange? My transmission flange is +1.5. You are saying I need to set my pinion angle off the pinion flange by way of the UCA at -2.7 to -3 to get them to match. Should I shim the transmission to get to the +2.7 to 3 to get the driveline to match?? I understand the steel will make more noise. I'm not having a noise problem. I'm having a vibration issue that gives me a nice back massage at 80mph.:-)

 

CR,
I think I got it figured out. You want the transmission flange and pinion flange to match but you want to make the pinion angle a couple of degrees negative for those cars with poly bushings etc. Am I correct? This allows for flex etc. Please tell me I got it...

 

Here you go... great write up:

http://www.cherod.com/mustang/HowTo/LCA%20_adj.htm

 

Thanks. I'll do just what it says. I don't understand why you get them equal then take the pinion up to -2 or -3 but if it works that is all that matters. Who am I to question it huh?

 

Are you sure your tranny flange is at 1.5 pointing down? Mine and every other car that has posted is at 4 pointing down. I even double checked against my crankshaft pully and that was right on at 4 pointing up. Make sure your car is level when doing this. Getting a bad tranny flange reading will screw up your pinion setting.

 

I just realized that last night we were placing the angle finder on the Ujoint of the transmission flange. That will give me a bad reading right? We also were measuring off of the ujoint on the pinion flange. Will that give me a bad reading too? Is it absolutely necessary to remove the driveshaft to measure these things?
So Scramblr, let me see if I can get this right. If your transmission flange is a +4 then you set your pinion flange at -4 right? Did you then bring the pinion flange back down to -2 or -3? I read the article that CR linked to above and that would seem to be what they are suggesting or am I missing something???

 

....

 

I measured my crankshaft pulley and it reads +3 so that means my trans flange is -3 right? If so then I need to set my pinion flange at +3 right?

 

Uninstalling the DS is best, but not necessary. You can get a good enough reading at the bottom of the rear flange "Not at the bottom of the differential". Not that you did that, but seems like a logical place to put the angle finder since it's flat.

What UCA do you have? I have the BMR and I could adjust to zero if I wanted to. Make sure your jam nuts aren't getting in the way. You should not need adjustable LCAs as well. I can't remember if you've taken your adapter plate off or not. That's my next step since I am pretty sure it didn't go in flush when I installed it. My pinion angle is +4 (DS) and -2 (rear) and my vibration is at 105mph.

 

Are you saying when you put the angle finder on the pinion flange you get a -2? And are you saying when you put the finder on the driveshaft you get a +4?

I have the CHE Double adjustable UCA. I have it as short as it will go and my angle finder is reading -2.

My install was super clean so I don't need to take the adaptor plate off.