Replaces the 4L60E pump rotor, slide and vanes with a 13-vane heavy-duty set so line pressure holds up at high RPM and under load.
A tired 4L60E pump rarely fails all at once. Line pressure sags at idle, falls away when you get on it at higher RPM, and the shifts start flaring once the fluid is hot. On towing trucks and high-mile Silverado, Sierra, Tahoe and Yukon units that wear is almost guaranteed. The K65927B kit replaces the whole moving core of the pump in one go: the 13-vane rotor, rotor guide, pump slide, 13 vanes, two hardened vane rings, the slide seal and an O-ring. That is the difference from buying a single rotor. If the slide and vanes are worn along with the rotor, this kit replaces all of them so you start from fresh parts.
The 4L60E uses a variable-displacement vane pump, which GM's service information describes as a 13-vane design. The rotor is driven by the converter hub, and the vanes slide outward against the bore of the slide. The vane rings sit on each side of the rotor and hold the vanes out at low speed so the pump primes. The slide pivots on a pin; the slide spring pushes it toward maximum output, and the pressure regulator moves it back toward center as pressure rises. Every one of those surfaces wears. Sonnax points out that even a worn slide pivot pin can push line pressure low or high, so the pump only does its job when the slide, vanes and rotor are all in good shape.
Start with a line pressure gauge rather than the scan tool. Transmission Digest notes that 4L60E pressure complaints should be checked with a gauge, not the commanded pressure control solenoid reading, because the solenoid can be commanding the right value while the pump cannot deliver it. Pressure that is low in every range and gets worse as RPM rises points straight at the pump. On the bench, look for scoring on the slide bore, the rotor faces and the pocket, and check vane tips for wear. Our guide to 4L60E pump rotor and bushing wear covers what to measure. If the pump body or cover themselves are scored past saving, a complete 4L60E pump assembly is the better route.
The listing covers 13-vane pumps in the GM 200-4R, 700R4 / 4L60, 4L60E, 4L65E, 4L70E, 4L75E, 4L40E, 5L40E and 5L50E from 1981 on, as a direct replacement with no machining. For the 4L60E that means 1993-2013 trucks, SUVs and cars. The one thing to check is vane count: some early pumps used a 10-vane rotor, and this kit will not convert them. Count the vanes on your old rotor, or send us your year and VIN before ordering. Rotor thickness in this kit is .7060-.7065 in, so measure your pocket and compare. See more pump parts on our 4L60E parts page.
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Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It fits 4L60E pumps that use the 13-vane rotor, which covers the 1993-2013 4L60E production run. Count the vanes on your old rotor before ordering, since some early pumps in this family used a 10-vane rotor.
A 13-vane hardened rotor, rotor guide, pump slide, 13 vanes, two hardened vane rings, an O-ring and a slide seal. The slide spring and pivot pin are not listed, so reuse yours if they are good.
No. It is a direct-replacement upgrade for compatible pump assemblies. You do need to check the pocket and rotor-to-body clearance before closing the pump.
If the pump shows wear, yes. Putting new frictions behind a pump that cannot hold line pressure is a common way to burn the new clutches within a few thousand miles.
Dexron VI ATF. Lube the rotor and vanes with it during assembly and prime the pump before the first start.
Yes. The listing includes the 4L65E, 4L70E and 4L75E pumps that use the 13-vane rotor.
