Pinion Angles?

[jonosranger]

Ok guys i have been fighting this for a while now. I have always had a slight vibration since i put this 3550 in my car. The rear suspension would go down so much when i lanched my car that the drive shaft would hit the floor board. Worn out shocks and no pinion snubber, Replaced shocks and snubber. Last thursday nite I took my car to the track on a 17" drag radial to play around. My second pass i launched at about 4500 and bent twisted my driveshaft to the point i could see it move 3/8 of an inch or better when i jacked the car up and spun the tire. So i Brought it home and changed driveshafts. Its driveable but still has a kinda bad vibration. My dad said something about pinion angles so i just glanced a the back on the trans and it is sticking up in the air. Im gonna go home and try to measure them today. Vibration is the worst when you are driving and u are not accelerating and not coasting but in between. I hope somebody can chime in. O and my car has solid motor mounts a stock trans mount, and factory 5 poly bushinged non adj. control arms with stock rear springs.

[86nu]

did it vibrate before the swap, solid mounts will transfer a lot of harshness, as for the pinion angle -1 or -2 is what we set ours at so when its on the ground its close to 0 or 1

[waypastcrazy]

Yea keep your foot out of it!lmao! In general 2 to 3 at tranny. -2 to 3 on pinion springs and shocks can effect it greatly. R u sure the driveshaft is correct length as in not to long with the 3550 trans. Lol good luck.

[Craig K.]

It has been a while since I set my pinnion angle but as I recall -2 to -3 is what I went with, you will need adjustable control arms to do this though.

The solid motor mount will transfer some vibration, if you clutch and coast does the vibration go away, though this would also take the load away from the diff.

[jonosranger]

did it vibrate before the swap, solid mounts will transfer a lot of harshness, as for the pinion angle -1 or -2 is what we set ours at so when its on the ground its close to 0 or 1
Not this bad it didnt.

Yea keep your foot out of it!lmao! In general 2 to 3 at tranny. -2 to 3 on pinion springs and shocks can effect it greatly. R u sure the driveshaft is correct length as in not to long with the 3550 trans. Lol good luck.
Well you kno lol :jester: As far as length i believe it is. guess i should check that lol. O I forgot to mention that the driveshaft is binding up into itself. As in the rear flange is hitting the driveshaft. Its hard to explain.

[jonosranger]

It has been a while since I set my pinnion angle but as I recall -2 to -3 is what I went with, you will need adjustable control arms to do this though.

The solid motor mount will transfer some vibration, if you clutch and coast does the vibration go away, though this would also take the load away from
the diff.

No it gets worse. I just put my 4.10 gear in cause the pinion was slightly loose so i thought i would just go ahead and get that over with and fix that.

[waypastcrazy]

I can take a look when I get home if ya want. But it cost ya a beer. Lol

[jonosranger]

I can take a look when I get home if ya want. But it cost ya a beer. Lol
lol Ill buy u a whole dam 12 pack :jester::jester: When will you be home??

[waypastcrazy]

lol Ill buy u a whole dam 12 pack :jester::jester: When will you be home??idk maybe fri

[jonosranger]

idk maybe fri
will you be off all weekend? If so i could trailer my car down to your house?? it dont matter to me i just need to get it fixed lol

[waypastcrazy]

will you be off all weekend? If so i could trailer my car down to your house?? it dont matter to me i just need to get it fixed lolwill know more thurs

[tayzoid1]

my car did this exact thing. when i put in my tko600 which is a newer 3550. put a aluminum drivshaft in it and it will go away i also have 4.10s in mine so that kinda magnified it at highway speeds. aluminum drivshaft cured my entire problem

[jonosranger]

will know more thurs
ok just txt me and leta me kno

[jonosranger]

http://i92.photobucket.com/albums/l5/jonosranger/0919091043.jpgo

[jonosranger]

http://i92.photobucket.com/albums/l5/jonosranger/0919091043a.jpg

[jonosranger]

http://i92.photobucket.com/albums/l5/jonosranger/0919091046.jpg

[jonosranger]

http://i92.photobucket.com/albums/l5/jonosranger/0919091110a.jpg

[jonosranger]

The passenger upper torque box is almost ripped loose from the body. Guess its time for some reinforcements

[jonosranger]

Ok so tonite I pulled the rear end out and my upper control arm bushining in the top of the rear end are completly broken to the point the control arm is rubbing the housing. and the passenger upper and drivers lower torque box is ripped pretty good. I will post some more pix up in the am

[SlowJoe]

Get it fixed

[jonosranger]

i think im gonna have to wait til i go to bowlin green nxt weekend to find some parts lol it looks real bad lol

[Dale McPeters]

The passenger upper torque box is almost ripped loose from the body. Guess its time for some reinforcements

Hey those pictures look familiar. I had that same problem on a car I have been working on.......:lol:

Get some of the wild rides torque box reinforcement plates for the top and bottom torque boxes and weld them in and it will take care of that problem. ;)