OK 70 CHEVELLE,, dont kno if its a true chevy 12 bolt,,or the bop,, i have pic at the bottom. eldabrock rear kit,arms lower and upper..with there anti hop bars.. ,, when im driving normally any speed there is no problem.. soon i as i full throttle it.. it will start shaking really bad in the rear end.. only does it 60mph + , if im going around a curve on it ,,seems to calm it down a bit.. ,we had it on a dyno bout year ago.. noticed the wheel has a lil wobble in it.. on passenger side. like a bent axle shaft?...but all bearings are good in it.. . i looked under neath it today..should this be like this? thinking bout removing the anti hop bars ,,see if it helps.. what else could it possible be.. ?
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and if anyone could identify if this a 12 bolt chevy,,or the bop ,, im thinking ts the bop.. thanks..

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Looks like a 70 and earlier 12 bolt Olds......

 

check you pinon angles of both the trans and rear end !?

Check wheel and drive shaft balance ? could even be a bent drive shaft ?

good luck

 

thanks.. im going to remove these anti hop bars..see if thats the problem and go from there... cant have it doing this with the ly6 boosted ...

 

If you have a wheel wobble, it's most likely a bent rim.
Check the end caps on the u joint. I cant see if it's fully seated. There's usually a lip or tab on the yoke that the cap seats inside of.

 

Dude....those no hop bars aren't even attached to the diff. The passenger side is totally off on the bottom and the driver's side looks like its loose too. As soon as you get on the gas hard the rear must rotate up a huge amount!!! DO NOT DRIVE THE CAR!!!

Andrew

 

If you are using a stock driveshaft I highly suggest you get rid of it for a custom made one in a larger diameter.

I had a stock one fail due to exceding rpm limit of the stock junk and come through the floor. You can get one for around $250 shipped, high speed balanced with thick chromoly walls.

 

check if the rim is bent, that will make it shake like a bitch at certain speeds, then calm down at other speeds

 

it doesnt wobble.. the rear shakes from left to right,,right to left. makes the the *** end shake left to right..righ to left.. im def .thinking its the hop bars..since now he metcioned that.. causeing to angle way higher,which then is makeing the drive shaft go out of angle.. thanks !!! i appreaciate all of your guys help.. i will try it,,see if it works.. im in the middel of building a turbo setup for the ly6.. so i cant drive it around right now. but i will post back when i try it.. thanks..

 

hit it, exactly!
The holes in the ears of the bars are there to allow the hsg ribs to be drilled, and a bolt dropped thru. If they are not attached, braking will allow the hsg to roll, same w/ accel.
I had a set to install on a customer's car. [for about 10 minutes]. I called Summit and was told they were a good way to break the hsg. [87 GN 8.5"]

http://www.performancedepot.com/ART/...13_14_Inst.pdf

Look at your floor pan.. Caved in??
I'm suggesting that the u joints be looked at CLOSELY..

1 word for those things: JUNK.
A set of adjustable uppers is in order. That way U can set the pinion as you want it.

 

Well.... Those bar are intended for one purpose (Drag racing).. and do work if installed correctly (as most likely stated in the instructions). But the way they are currently install.. I am supprised something has not broke by now. Without the lower part of the bars attached. It could see it causing our rear end to shift side to side.

Removing them or re-installing them correctly might resolve the current problems.

 

Why are you ******* around with a turbo when the first thing on your mind should to make sure that your car is safe?!

Andrew

 

thats has been like that for 3 years now.. with bbc run mid 11's..and a turbo 5.3 14 psi.. im surprised nothing has broke either.. i pulled the rear outa a cutlass .. this was all on it.. i knew nothing about the anti hop bars had t be drilled.. when i looked at some pics. i seen they had pins..and mine didnt..but had the holes for them.. so i posted this .. i will be correcting it..

 

Did You guys notice the second pic where someone JB-Welded the web support that a piece broke from ?

 

thats not jb weld.. thats where the bar is rubbing against the web.. the bar is starting to grind it down..from rubbing against it..

 

so ive decided just to install it corectly.. they were loose up top too.. hopefully this fix's the problem,, i appreaciate all your help.. [IMG][/IMG]

 

I've heard those bars work well when properly installed, glad you got them fixed!

 

Be sure and let us know whether or not that helps with your problem!

 

Yeah.. without the lower end of the bars attached, only thing holding the bars to the Upper Control Arm was the bushing an bolt on top of the housing. I can see that it would wobble and shift left to right.

But let us know if this fixed it.. (I think it would).

BC

 

Fix that leak too.