IRS into a '94 GT

[Vortec99GT]

Originally Posted by procharge94

I purchased koni SA's with 10" 600'lb coilover springs for the rear, urethane control arm and subframe arm bushings, aluminum diff bushings, and a rear bump steer kit is in the immediate future. Can anybody think of anything else I am missing on the rear?

Matt

Just out of curiousity, what model are the SA's that you got? Sports, 30 series, etc......? Also what was in the decision to get 600lb springs in the rear? I have the Griggs kit all the way around on my car (which i dislike btw) but it has 475lb springs in the rear its way to soft. Many people have been telling me that 475 was way to stiff..... as i was contemplating doing a 550 in the rear and a 500 in the front. Your thoughts?

[procharge94]

Originally Posted by Duncan

what car did you get the irs out of

It came out of an '03 Cobra. The guy was looking for a solid axle for the drag strip and I just happened to have one containing what he was looking for.

Originally Posted by Vortec99GT

Just out of curiousity, what model are the SA's that you got? Sports, 30 series, etc......? Also what was in the decision to get 600lb springs in the rear? I have the Griggs kit all the way around on my car (which i dislike btw) but it has 475lb springs in the rear its way to soft. Many people have been telling me that 475 was way to stiff..... as i was contemplating doing a 550 in the rear and a 500 in the front. Your thoughts?

If I remember correctly the SA's were 30 series, but I could be wrong. It was years ago and I purchased them used.

As for why I chose 600 lb springs for the rear? Mainly because it was available at a great price and I've heard of people running higher spring rates on the IRS. I matched this with 450 lb front coilover springs. I ran this setup at Sebring at about 50% effort (head gasket failure) and was surprised at how well the combination matched.


P.S. - Sorry for the incredibly delayed response. I had a slight leave of absence.