The Roadie wrote:Hmmmmm, now I'm confused. The references I found show the C25R to be for 2000-2005 Tahoes, not the ones with the new spring perches. I know Alek didn't have to fiddle with the perches, and the springs are already necked down. I guess somebody should go measure some pre-2007 Tahoe perches to see what changed. Anyway, here's a pic of Alek's C25R springs:
When I bought these Skyjacker had an older site up. Currently, if you use their site and drill down to Coil Spring Pairs for Chevy - 2005 (the latest year they support), only the Suburbans (1500 & 2500) have the C25R listed. The Tahoe and Avalanche list only the C40R and C50R. Under GMC though, the Yukon (non 1500 & 2500) has the C25R listed.
The old site also gave the lift heights and you guessed it, the C25R was 2.5 inches (for the vehicle it was designed for), the C40R was 4 inches, and the C50R was 5 inches. I think all of these models (C25R, C40R, C50R) have the same diameter measurements and only differ in height and perhaps spring rate.
I don't know why the C25R is not listed for the Tahoe anymore, I could have sworn it was so back when I was researching. I also contacted their tech support at the time to ask what the outside diameter of the coil was (in the middle) and what the inside diameter was at the perches. All the measurements looked workable at the time.
I ordered them (in Canada) from North Shore Offroad in British Columbia.
AG