Sonnax, Superior, Transgo

BUSHING CASE SONNAX "NO WALK OUT" TH400, 4L80E, 4L85E The OE case bushing in vehicles with a GM THM-400, 4L80-E and 4L85-E transmissions tends to w...

Valve Body Checkballs – Set of 10 This set includes 10 high-performance checkballs (.250" size) made from durable, wear-resistant imidized plastic....

Superior Shift Kit for TH400 The Superior TH400 valve body kit provides a comprehensive solution for both regular and heavy-duty applications, addr...

TransGo Reprogramming Kit with Gear Command for All 400 (1965-ON) The TransGo Reprogramming Kit for the TH400 transmission offers enhanced automati...

Transgo SHIFT KIT Valve Body Repair Kit with Plate for TH400 1965/Up This repair kit is designed to address and rectify common issues associated wi...

Sonnax Line Pressure Booster Kit for TH400 The Sonnax Line Pressure Booster Kit for the TH400 transmission is designed to enhance your vehicle’s pe...

Sonnax Case Saver Retainer for TH400 & '98-Earlier 4L80-E The Sonnax case saver retainer 34762-10 is the only intermediate clutch retaining rin...

Sonnax Planetary Rebuild Kit for 4L80-E, TH400 Transmissions Optimize the performance of your TH400 or '98-earlier 4L80-E transmission with the Son...

Transgo Reprogramming Kit For TH400 This comprehensive kit is designed for heavy-duty and high-performance applications, offering expert valve body...