Transg0 Shift Kit (SK4L60E) & Transg0 Valve Body Separator (46-PLT-96) Comes with free valve body gasket! Fits 4L60E 4L65E 4L70E 4L75E Transmissions 2001-2006 **Installation does not require transmission removal** This kit is a must to fix code 1870
Resolves:

Light & Hard 1-2 shift

No lockup or 4th

Converter shudder/slip/burn-up

3-4 clutch and 2nd band failure

Rear planet burnup and bushing burnup

1-2 Bump-Double bump slide bump

Harmonic bounce that wears out pump and valves and causes shuttle shifts.