t.ransgo 8L90 SHIFT KIT Valve Body Repair Kit includes everything needed to address the most common complaints in the 8L45 and 8L90 transmissions from General Motors.Corrects/Prevents/Reduces: TCC instability issues/overheated converter Secondary regulator circuit VB worm track cracking Loss of converter feed Codes PO218 and PO741 High line, harsh shifts Low line, soft slipping shifts Broken hard parts Low cooler flowIncludes: Drop-in PR and shuttle valve line-up Drop-in TCC regulator valve Drop-in S2, S3 and S4 regulator valves Oversize converter feed limit valve Oversize AFL valveRequires: #AFL-G2-TK Tool Kit (This is the same tool kit used for multiple GM and front wheel drive 6-speed kits)