WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC 4L60E/4L65E Shift Solenoid Kit A & B 2-Piece OEM Replacement for 1-2 and 2-3 Smooth

Genuine GM OEM 2-piece shift solenoid kit (A & B) for 4L60E and 4L65E transmissions that restores reliable 1–2 and 2–3 gear changes.

This OEM replacement set from WIT WHATEVER IT TAKES TRANSMISSION PARTS, INC contains both the 1-2 (A) and 2-3 (B) shift solenoids engineered to factory specifications for GM 4L60E/4L65E units. Supplied as a two-piece kit, these solenoids replace part numbers such as 24230298, 10478120, 24236521, and 10478131, covering many Chevrolet, GMC, Cadillac, Buick, Pontiac, and Hummer models built between the 1990s and mid-2010s. The kit is intended to help correct common transmission symptoms related to solenoid wear without requiring non-OEM parts or extensive modifications.

How will these solenoids affect shifting performance?

Installing this OEM A & B solenoid kit targets shift quality issues by restoring the hydraulic control that times gear changes. When solenoids operate as designed, the transmission can engage the correct gear sequences smoothly and consistently.

• Replaces worn or sticking valves that cause delayed or harsh 1–2 and 2–3 shifts.
• Reduces occurrences of slipping, hard shifts, and erratic upshifts.
• Works with factory electronic control strategies for accurate shift timing.

Which vehicles and part numbers does this kit fit?

The kit is compatible with GM models using the 4L60E and 4L65E automatic transmissions from roughly 1993–2014. It directly replaces several GM part numbers so you can match it to your transmission service manual or parts list.

• Direct replacement for 24230298, 10478120, 24236521, 10478131.
• Common fits: Chevy Silverado, Tahoe, Suburban, Blazer, Camaro, Corvette, S10.
• Also fits: GMC Sierra, Yukon, Savana, Cadillac Escalade, Buick Roadmaster, Pontiac Firebird/GTO, Hummer H2/H3.

What are the practical benefits of using genuine OEM solenoids?

Choosing an authentic GM solenoid kit helps ensure correct dimensions, electrical characteristics, and materials that match factory tolerances. OEM parts typically integrate cleanly with existing harnesses and valve bodies, reducing the risk of fitment or calibration issues.

• Factory-spec materials resist heat and pressure for reliable service life.
• Direct electrical and mechanical compatibility avoids adaptation work.
• OEM fit reduces the need for additional parts or specialty tools during installation.

How do I know if these solenoids are the right repair for my transmission?

Symptoms like failure to upshift, missing 1–2 or 2–3 shifts, limp-home mode, or transmission-related fault codes often point to solenoid faults. A scan tool or basic diagnostic check that isolates solenoid electrical faults or valve body hydraulic issues can confirm whether replacement is appropriate.

• Look for codes related to shift solenoid A/B, pressure control, or shift timing.
• Check for harsh or delayed shifts under normal driving conditions.
• Evaluate fluid condition—severely contaminated fluid may indicate a broader service need.

Who is this for: This WIT-supplied genuine GM OEM solenoid set is intended for technicians, DIY mechanics, and fleet owners servicing GM vehicles with 4L60E/4L65E transmissions who want factory-fit replacements. It's suitable when diagnostics point to A and B solenoid faults or when restoring shifting performance with direct-fit parts matters for reliability and resale value. If you need to match GM part numbers 24230298, 10478120, 24236521, or 10478131, this two-piece kit provides a straightforward OEM solution.