[tg150]

Hello all..

I appologize for never mentioning the size of my previous 18" wheels and tires vs my 20" wheels..

the 18's were P275/65/R18
the 20"s are P275/55/R20

After i installed the Gryphon on level 2 i took my truck for a drive like Jack suggested "Before" going into my "Custom Options" and changing the TS and GR, which turned out to be a great idea. My trucks speedo was approx 1-2 miles faster than the gryphon so i figured i must have been right on from what i read. But i wanted more proof so i went home and got my Garmin gps and sure enough the MPH on the gps and the gryphon matched exactly. So come to find out there really is no difference between the oem 18" wheels and oem 20" wheels.

Overall i love my gryphon..i did notice and improvment in perfomance, quicker shifting and responce.. I cant wait to get my 87 performance tune.

I'd like to thank everyone that replied and helped me figure this out and hope this post helps others that might be wondering the same thing. TY..

Jack.. a special thank you to you for accepting my PM's and walking me through it step by step all day long. Your a great guy and i really appreciate it. TY..

Corey.. Ty for being so polite when i called and answering all my emails quickly.. I enjoyed all the goodies that came along with my Gryphon and it sure made my day

Thank you everyone..
-Tony