hi guys....just wanted to ask a question....i am going up to the track saturday and i am trying to get my rear set up right.....95% of the time i drive it on the street and maybe hit the track 4-5 times a year......right now with the suspension loaded and the car level my trans is -5 degrees and my pinion is 0 degrees....i am running super stock springs on my roadrunner with a pinion snubber about 1 inch from the floor...i am cutting off and rewelding new axle saddles since the rear is out of square with the center line of the car.....should i minus the pinion ?? degrees
if anyone could help me out that would be great
thanks
george
at the risk of being flagellated by the 'pinion master, -5 is ok. i run mine about -6 on the street with ss springs and it has been very reliable. i do get a little vibration at high speed cruise, but that's just the way it's got to be until i backhalf it and get the angle closer to zero.
so maybe i should minus the pinion angle down to -1 or maybe -2 since i am installing new saddles anyway?
-7 is near ideal with ss springs. it won't be the smoothest at high speed cruise, and it may need ujoints every couple of years, but i have had no problems at -6 (actually more like -6.5).
so if i use the pinion degree indicator on my pinion yoke to measure degrees i would need plus 2 degrees on my pinion to get minus 2 degrees nose down which is ideal for the street and occasionally for the track.....what do you think?
your right,,,,thanks mike
i wouldn't run -2 with ss springs at the track. that's a driveline killer.
Posted By: DoctorDiff
Re: pinion angle - 10/06/10 04:31 PM
Normally, a true 4 degree negative pinion angle is the maximum I recommend. This is relative to the transmission center-line, not to the driveshaft or the ground.
I like to see 2 degrees negative for a street car.
Posted By: polyspheric
Re: pinion angle - 10/07/10 12:34 AM
BTW: to make a "degree" sign, press & hold the ALT key, while typing 0 1 7 6
was talking to a guy who sets-up ladder bar/4 links....chevy guy....and he said.....level car suspension loaded.....check the degrees on the driveshaft which is minus 1 degree and the pinion is 0 degrees....for me to lower or minus the pinion to 2 degrees which would give me minus 3 degrees.....he said never raise or plus the degrees of the pinion because of spring wrap up.......what do you think?.....and i will be using a pinion snubber
Posted By: DoctorDiff
Re: pinion angle - 10/07/10 04:38 AM
That method only works sometimes, depending on the angle of the engine/transmission.
Pinion angle is the relationship between the transmission centerline and the pinion centerline. Ideally, you want the pinion to become relatively parallel to the transmission as the pinion swings upward when the car is under power. This is how U-joints are designed to run.
In other words, make the pinion parallel to the transmission as a base-line, then rotate the pinion downward 2-4 degrees.
Don't worry about the operating angle of the driveshaft unless the vehicle is severely lowered or raised, causing the U-joints to bind.
Posted By: Evil Spirit
Re: pinion angle - 10/07/10 03:01 PM
Every time I read one of these pinion angle posts my right nipple starts to bleed.
Measure trans. Make pinion the same, as in parallel. Tip the front down an additional 5*. That's 5* pinion angle. Done like dinner.
°°°°°it... could... work...
THANKS GUYS FOR ALL YOUR HELP
well it worked.....went to the track.....turned a 10.442/129.06mph..10mph head wind....no vibration at all.....cool
Posted By: mod381
Re: pinion angle - 10/10/10 03:04 AM
I like to see 2 degrees negative for a street car.
If the transmission slopes downward 5 degrees toward the rear, the pinion should slope upward 2 degrees toward the front.
This is referred to as 3 degree negative pinion angle. I consider 4 degree negative to be the maximum for a true street car.
thank you doctor diff....thats what i am going to do.....i will report back when i am done with the test drive.....3 degrees negative pinion angle
I see you wrote car worked good. Is this what you have it set at?
