Sonnax 42RE 42RH 46RE 46RH 47RE/RH 48RE Transmission Shim Kit 12783-01K Part No. 12783-01K Shims (3) Primary Washer Overdrive Set-Up Material: Steel Sonnax overdrive shim kit 12783-01K eliminates the need to stock multiple OE selective spacers by providing one .175" thick washer and three .010" thick shims for setting the clearance for proper washer end play. Allows proper set of end clearance. Eliminates need to stock multiple OE spacers.