This is a 28% reduction for the Rincon which lowers drive and reverse ratios. This reduction goes in the sub-transmission located behind the rear engine cover. No modifications are necessary for install. The gaskets and rear seal needed for install are included in this kit. Wide open auto shifting is affected but drivability is retained. If you choose to correct wide open auto shifting you will need to add two (2) "Early Style" shift modules to your order. The modules can be found in the "Parts" section of the site. No clutch puller necessary.