Superior Transmission Parts, Inc.
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 4L60-E Boost Valve
And Sleeve. 
(Superior K021
Problem Solver)
Click on the box above to view the contents of this kit. 
  • Replaces worn out O.E. aluminum valves.
  • Made of hardened steel to resist wear.
  • Valve boost diameter is set at .471 for higher boost capacity.
  • Proper tolerance assured at bore mating surfaces.

Note to purchasing: Ask for Superior part number K021.  

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