View Full Version : IRS shocks/springs
Carolina Hot Rod
09-13-2015, 10:09 PM
Does anyone know if the rear shocks/springs are the same units as for the 3 link and 4 link?
myjones
09-14-2015, 06:57 AM
You might get a quicker answer by going to the tech section and asking Jim Schenck
RacinShark
09-22-2015, 07:32 PM
The IRS uses the same rear shocks as the front shocks, FFR# 33978, the rear coil-over are 300# in place of the 250#.
myjones
09-23-2015, 07:26 AM
RS
Your post about the rear springs being 250 doesn't seem right if memory serves. I dropped DOWN to 300 because the kit came with something stiffer and they were too harsh.
Where did you get that number?
For clarity, mine is a 4 link so I was answering for that rate
DB
Hemi33
Carolina Hot Rod
09-23-2015, 09:34 AM
FFR just gave me some specs on the shocks, but not the springs.
Front 15.15 " EXT, 11.10" COMP, 4.05" stroke
Rear 17.63" EXT, 12.16" COMP, 5.47" stroke
Matt
RacinShark
09-23-2015, 12:20 PM
RS
Your post about the rear springs being 250 doesn't seem right if memory serves. I dropped DOWN to 300 because the kit came with something stiffer and they were too harsh.
Where did you get that number?
DB
Hemi33
The parts listed for the IRS come from the kit I just picked up Saturday morning.
Box 4D had FFR# 33978 Koni Front Shock 82-2610 and FFR#33976 400# coil-over springs.
Also box 4D has FFR#33979 Koni Rear Shock 82-2611 and FFR#33975 250# coil-over springs.
The 2015 IRS parts in box 3K have FFR#33978 Koni Front Shock and FFR#80597 300# coil-over springs.
Page 26 of the IRS Installation Instructions state "The Hot Rod IRS springs are 300lb. Other springs are available for different ride characteristics."
I'm just a rookie learning the specs as I start my build.
Carolina Hot Rod
09-23-2015, 05:51 PM
Something there doesn't sound right. you mentioned front shocks twice. I went online to Koni but I couldn't find a way to search for info from the Koni part number. My kit will be here in a few weeks. I guess I'll just wait to see what I get.
RacinShark
09-23-2015, 10:55 PM
Something there doesn't sound right. you mentioned front shocks twice. I went online to Koni but I couldn't find a way to search for info from the Koni part number. My kit will be here in a few weeks. I guess I'll just wait to see what I get.
Yes, the IRS kit uses the same shocks front & back.