guero68

iTrader: (20)

I been chasing this high speed vibration for some time now. I believe something isnt right after the gear install but mybay its my pinion angle. The current pinion angles are (TRANS -4.4 pointing down... DRIVE SHAFT point down into the pinion or upto the trans depends and how you want to look at it 2.5 and PINION +4.3.....) I just had a new transmission built by ACE and now i can fell the vibrations more sine everything inside the trans is nice and tight. The drive shaft is a one piece from texas drive shafts 5in aluminum high speed balance 1350 spicer ujoints....

Do my angles looks off....this is driving me carzy i am thinking something is wrong with the pinion gear install....The vibration is a high speed vib that starts around 75mph and gets worse with speed....

Gadgetized

iTrader: (9)

Does it vibrate if you put it in neutral? When you are in the throttle it will force the pinion up a few degrees.

guero68

iTrader: (20)

Hmmmm....

Dont think its going to work since when i left off the throttle it continues to vibrate until i get under 75mph...but it worth a shot

Going to have to try that in the morning..will post finding after the neutral test...

guero68

iTrader: (20)

Well getting the truck to make the vibration and put it into neutral didnt help any... No change in intensity or anything....thinking it might be backlash issues

iamkeniff

iTrader: (16)

it could be a bad u-joint, did you check them before reinstalling the dshaft? Also check to make sure no weights are missing.


Are the u-joints in line?

guero68

iTrader: (20)

All the caps look good and doesn't appear to be missing any weights that were welded on..

What do you mean by line...like phased

Phantom

iTrader: (16)

if it looks like the drawing you posted, that's your problem. The pinion and drive shaft should meet and form a V not a ^ or -

Phantom

iTrader: (16)

Pinion Angle - Wolfe Race Craft

Phantom

iTrader: (16)

you subtract the driveshaft angle from the pinion face angle. You have ~ 1.8+ pinion angle according to your drawing. That's where your vibration is coming from

guero68

iTrader: (20)

had seen that link..everyone talks about parralle lines and such...will give it a shot this weekend to see what going on....thank for the info..willl keep everone posted...