GM A Body Drive Line Angles
 

What are optimum angles for this type of suspsension system. It seems I cannot get the angle of the pinion and the crank to be parallel. The engine/trans is pointing down by 5 degrees, when viewing car from the side it slopes toward the rear. The pinion is currently sloping down toward the ground as well. I have adjustable top trailing arms with heim joints each end and can adjust the angle of the pinion, which also affects driveshaft angle. I can also shim trans mount some as well until header clearance becomes an issue. Should I be more concerned with trying to minimize operating angles of the u joints at each end rather than relationship of the pinion angle to the crank angle.

Any input is much appreciated.

Thanks, Scott

Re: GM A Body Drive Line Angles
 

The nose of the diff will rotate upward on takeoff, so it should point down a little at rest.

Re: GM A Body Drive Line Angles
 

That statement may be confusing to some... And not exactly true....
This may explain the "pinion angle" concept better..... http://www.rosslertrans.com/pinion%20angle.htm

Re: GM A Body Drive Line Angles
 

Scott, I thought I answered all your questions/explained how to check/set in our PM's last week. :confused:

Re: GM A Body Drive Line Angles
 

Ed You did.

I just like to get other's opinions on the subject. Never hurts to have agreement. I have everything all set up and will try it in a week or two to see if the changes help.

Any opinions on anti roll bar settings? No preload or pre load passenger side and if so do I make the links longer or shorter?

Thanks, Scott

Re: GM A Body Drive Line Angles
 

One thing to remember as you look at the Rossler chart is that having zero zero is better than +two-two. Don't have the formula in front of me but I think a 3 degree ujoint misalignment eats 1% horsepower so if you are down 3 on the trans and up 3 on the rear to make them parallel then it is 1 or 2% loss. Don't remember if the formula is for 1 joint or a pair. Work to get 0-0 knowing sometimes you just cant.

Re: GM A Body Drive Line Angles
 

ok, just make sure that these others offering opinion have GM A body cars that leave on par with this one, launching off the footbrake and nearly 3900 lbs.;)

http://classracer.com/classforum/pic...pictureid=5257

Re: GM A Body Drive Line Angles
 

[QUOTE=1320racer;395446]ok, just make sure that these others offering opinion have GM A body cars that leave on par with this one, launching off the footbrake and nearly 3900 lbs.;)

The all knowing, 1320 Racer, speaks again. Get over yourself. That car is not a Stocker, not a Super Stocker. Anyone (with enough money) can stuff a high HP BB Chevy in a Chevelle, Firebird, etc., and go fast.

Re: GM A Body Drive Line Angles
 

[quote=Jim Kaekel;395533]You took the words out of my mouth.....well said.

Re: GM A Body Drive Line Angles
 

it ain't about "go fast", it's about getting these cars to work and neither would you know anything about!:p

Meanwhile, show us your car no mind another GM A body that has gone 1.28 60 foot with a bolt on suspenion, using all and nothing but the factory mounting points, nothing welded and no anti roll bar, launching off the footbrake and weighing 3900 lbs.:p

The Proof is in the Performance!