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Pinion Angle

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Old 09-09-2009, 07:59 PM   #21
calfroper_06
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Thanks for the info fellas, The father in law got the driveshaft re-balanced today, and they mad on adjustment on the side that didnt have any weights on it.

Was just wondering, been told that if you have no change in the angle between the trans DS, and pinion, than its bad. Say we move the pinion up to 2.5*, and the trans, DS and pinon bot read ot to 2.5*. From what im understanding from what the guy said, this is the worst thing to have. Doesnt make since to me but does anyone actually know the answer?
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Old 09-09-2009, 08:22 PM   #22
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Yes that's true...having 0 deg at the U-joint (dead center with either the trans or rear end) is indeed bad....Why? because the needle bearings are not able to spin. You should shoot for 1/2 to 3/4 deg minimum difference between DS and trans/ rear

-Gun
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Old 09-09-2009, 09:17 PM   #23
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thanks for the answer, it actully makes sense now that you say it. lol
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Old 09-10-2009, 04:03 AM   #24
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Is it better now?

For some reason, I've developed a big exhaust leak on the right side of my car..... I'm pretty sure you were riding on that side! LOL
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Old 09-10-2009, 10:30 PM   #25
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Quote:
Originally Posted by coolhnd9 View Post
Is it better now?

For some reason, I've developed a big exhaust leak on the right side of my car..... I'm pretty sure you were riding on that side! LOL
What you sayin, lol Not my fault you went old school "bullit"style on me, lol

But yep the BVD balanced the DS and i just got the phone call from chad that its almost completely gone. BVD had to put a huge weight on the rear end were there wasnt a weight.

Going outta town for the weekend to go visit family, But we might swing by temple's track tommarrow night. Ill call you sunday to see whats up, maybe we can go for a mini cruise.

Thanks for all the help guys!!!!
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Old 09-11-2009, 12:11 AM   #26
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Please let me know if the weight solved the issue..
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Old 09-11-2009, 06:12 AM   #27
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Havnt gotto takea rifde in it yet, but the father-in-law said he got it to 105-110 without any vibrations yet. Thats on a closed course in mexico=). Thats with an open 2.78 hear

Thinking about putting 3.80s in it, instead of the 4.11s the locker has on the other third member. Ill let yall know for sure only we get some lower gears in it and see how it turns out. thanks
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Old 09-11-2009, 11:08 AM   #28
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Well it sounds like it fixed the problem if it was bad at 90 and now totally smooth at 110.

You gotta answer all these questions for me as best you can!

1) When the vibration started where did you feel it from first? Where did you hear it from?
2) Would the vibration get worse exponentially? as in hardly noticeable at 73mph but twice as bad at 76mph and again twice at 79....By 83mph it felt like something was about to grenade??
3) Would the vibration get worse momentarily when you backed off the gas?
4) what speed did they balance the DS?

Thanks

-Gun
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Old 09-11-2009, 03:34 PM   #29
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Ill double check with the father-in law but heres my best description, lol


When we had the 4.11s in with the locker it would come in at around 63 and double in short speed changes, itwas bangin pretty hard at 70. never got it past 75, the dash and everything started jumping. With the 2.78s with the open diff, it was the same type and everything, except now it came in at around 84ish, and was hard at 90.

And yes when you decelerated it would get worse for around 5mph or so speed drop, then it would level off.

The shop that balanced it said the highest they could spin balance it was 2400 on their machine, the way he talk he said thats as fast as any shop can do it, but not real sure.

hope this helps
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Old 09-11-2009, 04:30 PM   #30
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Did the sound seem to come from the shifter handle? Did the shifter handle vibrate with a profound high speed vibration?

-Gun
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Old 09-13-2009, 09:44 PM   #31
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no sound really sounded like it was coming from the rear. The shifter vibrated but not to bad, might be because of the poly mount.

UPDATE: SO the driveshaft was the cause of 99% of the vibration problem. We installed the 4.11s back in this evening and man what a diffrence. We got the car up to 125mph and it a a very slight steady vibration. Its livable with but were going to play alittle more with the pinion angle to see if we can get rid of it completely.

Its so much fun to drive and cruise in now, o and really fub when you smoke the tires down in third going 70....alittle scary too
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Old 09-13-2009, 10:44 PM   #32
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I bet the DS is the cause of 100% of the vibration... they balanced the DS at 2500 rpm...you are currently spinning the DS at 7,000 RPM....This is rather close to the critical speed of your stock DS (the speed at which the DS grenades a take a lot with it) You may want to consider buying a DS rated for that type of speed.

http://www.streetortrack.com/Custom-...-pr-16159.html

These guys sell some that will run true past 8000 rpm....I think thats what im fixing to get.

Of course a better pinion angle can't hurt if it does just take the shims out...totally worth trying.

-Gun
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Old 09-14-2009, 04:04 AM   #33
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i'm eyeballing the denny's driveshaft for mine. you get the slipyoke there with it and that has the advantage that the whole thing will be balanced, not only the tube. further I believe that S&T will just order them off some DS crowd, where with Denny you get it straight from manufacturer, with accurate measurements needed.
I'm positive my driveshaft is off as well. I bought it 2nd hand of ebay and the old one (which had no problem) didn't fit because of the 1210 u-joint holes in the back. So I couldn't crosscheck.

Best of luck!
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Old 09-14-2009, 10:54 AM   #34
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I might get it from Denny as well....I haven't decided yet..

-Gun
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Old 09-14-2009, 12:18 PM   #35
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Quote:
Originally Posted by Gun Jam View Post
I might get it from Denny as well....I haven't decided yet..
-Gun
check out : http://www.dennysdriveshaft.com/c124...iveshafts.html
their street rod shafts are for everything under 500HP ... usually they take 2 weeks to manufacture as they always have a huge backlog. but so far everyone seems to agree that it's well worth it
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Old 09-14-2009, 12:46 PM   #36
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Ohhh that 3" Al one for 350 looks nice....The price is very competitive as well.. I think you have effective swayed my decision

-Gun
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Old 09-14-2009, 01:50 PM   #37
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Ohhh that 3" Al one for 350 looks nice....The price is very competitive as well.. I think you have effective swayed my decision

-Gun
ya. they have one of them with my name on it as well. comes with yoke and u-joints. can't beat that :-) best thing is you give them exact measures via their measuring charts and whatever they send you will match perfectly
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Old 01-17-2010, 05:56 PM   #38
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Well the vibration is back more than ever. We ended up installing a new Currie 9" with 4.11s, as well as a steel Mark williams DS thats balanced to 7,000 rpms. Got it all put in and the vibration was terrible!!!!! We noticed there was only o balance tab on the front of the DS.

Measure it with a dial indicator and it showed to be .023 off at the yok and .026 off at the center. So we packed it back up and sent it back were he charge us freight for thier mistake. Got it back and and its still the exact same off at the yoke and center of the DS. The vibration is calm anywee under 50 but at crusing speeds it like a pulsing vibrator!!! This is a big headach....
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Old 01-17-2010, 07:05 PM   #39
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so with the stock DS and 8" open rear end it was smooth to 120...right?

You got a new DS and a new rear end and now its really bad?

Where did the axles come from? Could one be bent? If it was great to 120 before and now its crap at 50 it cant be the pinion angle...Assuming it didn't change any.

Check for a bent axle.

-Gun
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Old 01-17-2010, 07:05 PM
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