Pinion angles

[Canadian1968]

Crawled under the car tonight and measured the angles of my tailshaft and diff .

THE tranny looks to be 2.7 down ( x pipe made this harder than it should have been !) And my diff is pointing up 1.7.

Although almost parallel they are opposite of what I want I want the trans up and the diff down. I'm wondering if my transmission mount is that worn that it is sagging a bit ? I will need some pinion angle shims to correct the diff housing

[cdr]

Crawled under the car tonight and measured the angles of my tailshaft and diff .

THE tranny looks to be 2.7 down ( x pipe made this harder than it should have been !) And my diff is pointing up 1.7.

Although almost parallel they are opposite of what I want I want the trans up and the diff down. I'm wondering if my transmission mount is that worn that it is sagging a bit ? I will need some pinion angle shims to correct the diff housing

trans will be down about 3 that is the way they are built ,, what you have should be good, no way can you get the trans UP , it would hit the floor

[Canadian1968]

Alright.  I guess those specs give me 1* total down. u think I want to add 2* to give me a total of 3* see how the car likes it

[cdr]

Alright.  I guess those specs give me 1* total down. u think I want to add 2* to give me a total of 3* see how the car likes it

are you having a problem now? if you are drag racing you would want the pinion down a little more, what you want is under a load to have them parallel 

[Canadian1968]

no vibrations at all. 
Yes I am looking for more bite at the track and just alround in general. Always felt the car seem very loose even for a street tire .

If I point the nose down to far will I not start to run into over all drive train problems ?

2 degree shim would put the diff more or less level but my overall pinion angle would be 3 degrew down from what I have been told .

if I were to put in a 4 degree it would put me at 5 .

[cdr]

no vibrations at all. 
Yes I am looking for more bite at the track and just alround in general. Always felt the car seem very loose even for a street tire .

If I point the nose down to far will I not start to run into over all drive train problems ?

2 degree shim would put the diff more or less level but my overall pinion angle would be 3 degrew down from what I have been told .

if I were to put in a 4 degree it would put me at 5 .

leave it alone, in your case adding angle will not help your car get better traction, better tires will

[XH29N0G]

I'm with the others on this.  The general idea with harmonics is diff parallel with transmission under load.  I know moving the front down will have an effect, but do not know how much that would be.

I also agree that for traction, I would first look to tires. 

[c00nhunterjoe]

Leave it be. Why do you feel the pinion angle is causing traction problems? Im intrigued. Give me a rundown on the combination and what it is doing at the track.

[Canadian1968]

well one reason I thought it would be a problem is that the examples that I have read. Say that you want the nose off the diff down  ( how much depending onnyour setup ) . the reason being under accel. the diff wants to move up, and if your angle is down at rest the idea is to get to 0 or level to help the suspension push the tires into the ground .

So when i saw that my diff was already pointin up at rest I thought under accel it will be moving up even more and possibly pulling the tire away from the ground instead of into ?

The car jus breaks loose very easy Im jist trying to make sure evert thing is right before i start throwing more tire at it

[XH29N0G]

My guess is the breaking loose is the tires.  I suspect my set up is not that different from yours from what I have seen of your earlier posts and how my car seems to behave at the drag strip.  I had to go to a soft compound tire and use 255 M/T drag radial to keep it from breaking loose.  There are some disadvantages to those tires, but I like them. 

The alignment of pinion angles might not be right on full acceleration for me, but I do not know if we would feel it during the time we are there compared with the times we are driving normally.  I did move things around and found other things changed as I did.  I moved them around because I had driveline vibrations.

[BSB67]

The pinion angle and traction logic is very broken.  The pinion angle will not change the amount of axle wrap-up. It is the distance between the snubber and the floorboard at rest.