If it went the wrong way, slowed down with the bar change, then you eventually want to go back to the original and work from there.

Yes, the chassis can be made to squat down onto the tire with the 4 link. Tightening the bump on the shock or moving the front of the bottom bar up will reduce or eliminate that. Excessive squat may cause the tire to rub in a tub if it is too close early. Typically, once the car has moved off the starting line a bit, (before 60') it will come back up off the suspension, depending on shocks, etc. Again, down track, on a car that's not high horsepower, radial and/or something else peculiar, it should come back to near ride height in the rear.

Thanks Al. Ordered new slicks today. Wow so many opinions on tire balance, but my 4 link installer told me the same thing you did, he doesn’t balance.

Thanks cab.

Much for me to learn here. My fear was the 4 link installation was installed wrong. How do tell anstaller these suggestions DIPLOMATICALLY??? You gents are all very smart, this is all magic to me. I ordered new tires and went down one inch in width and height. I hope this helps. I have watched some of tim mccamis videos, they helped somewhat.

Thanks cm

Track is great bend, it’s a nice track. I will call drive shaft guy tomorrow and ask all questions raised. This is rocket science to me, but trying to eliminate one by one.

Test it on jackstands on all four corners at the same height above ground and see if it shakes or vibrates with the rear tires and driveline revved up in each gear like you race it
Let us know what you find out

I always stayed after tire balance. Having access to a good machine made it easy, and free except for some time. I have buddies who have an old bubble machine and swear by it.

I understand some don't, and don't have issues. BUT, if I were after a vibration, I would have them checked. I've seen guys catch wheels bent by an idiot installer.

Still like to see some picture of the bars and brackets in the car. I see the 4 link chart but woudl like to see the stuff n the car before you throw anyone under the bus so to speak...I can post them if you like you can text me the photos if thats easier....

Here are some photos of 4link and shock

Here is one of the passes we made. 5.62 in eight. Son lifted due to shaking. Anyone tell me how to attach this video I made? I could do it.