APSG Shift Lever Shaft Seal Tool Kit — TIMKEN GM/Allison Installer & Remover, Fits Turbo 350–4L/6L/8L Transmissions

APSG Shift Lever Shaft Seal Tool is a complete installer and remover kit that lets you replace the manual shift lever (selector) seal quickly—without draining the transmission fluid.

This specialized tool kit includes a genuine TIMKEN replacement seal and a purpose-built driver set that fits a wide range of GM and Allison automatic transmissions. Designed for professional mechanics and knowledgeable DIYers, the tool allows removal and installation of the shaft seal from the transmission case in minutes, reducing labor time and avoiding the mess and time required to drain and refill fluid.

Which transmissions does this tool support?

The APSG tool covers many GM and Allison models across several decades, including classic Turbo 350/400 families and modern 4L/6L/8L series units. Verify the list below against your transmission code or service manual before ordering to ensure compatibility.

• GM TH180, TH200, TH200C, TH200-4R (1976–1990 range)
• Turbo 250/250C, Turbo 350/350C, Turbo 400/425/475 families
• 700-R4, 4L60/4L60E/4L65E/4L70E/4L80E/4L85E (1993–2011 and later 4L variants)
• 6L45E/6L50E/6L80E/6L90E/8L90E (2007–present) and PowerGlide
• Allison models: AT540–AT1545, MT640–MT657, LCT1000–LCT2400 (1970–2015 era units)

How does the tool remove and install the shaft seal without draining fluid?

The installer/remover engages the seal and shaft housing so you can extract the worn seal and press the new TIMKEN seal into place while the transmission stays mounted and full of fluid. This avoids the time and complexity of removing the transmission or pumping out fluid.

• Specialized driver cups center on the shaft to extract the old seal cleanly.
• Press-fit driver ensures the new TIMKEN seal seats squarely and to correct depth.
• No transmission drop or fluid drain required in most service scenarios.
• Works on short-shaft and many long-shaft selector designs where specified.

What’s included and how does it compare to other tools?

The APSG kit ships complete with a genuine TIMKEN replacement seal plus the matching installer and removal drivers. It’s built to function like common professional tools but offered as a ready-to-use kit that avoids sourcing parts separately.

• Genuine TIMKEN shaft/selector seal included for immediate repair.
• Driver set sized to fit the listed transmissions' selector shafts.
• Comparable to Atec T-1001-PV, Kent-Moore J-43909/J-43911, KD Tools 2393, Snap-On YA9348.
• Complete kit eliminates guesswork and additional parts purchases.

How long does the job take and what skills are required?

With the vehicle safely supported and the selector linkage accessible, most technicians finish the seal swap in a few minutes. Basic mechanical skill and standard hand tools are required; follow service manual guidance for safe access and parking pawl precautions.

• Typical service time: just a few minutes once access is prepared.
• Requires common hand tools and a clean workspace to avoid contamination.
• Not recommended for completely inexperienced users without supervision.
• Always consult the vehicle service manual for exact procedures and torque specs.

Who this is for: The APSG Shift Lever Shaft Seal Tool is intended for automotive professionals, transmission specialists, and confident DIY mechanics who service GM and Allison automatic transmissions. If you need a fast, low-disassembly solution to stop a leaking selector shaft—especially on older or high-hour transmissions—this kit supplies the correct TIMKEN seal and driver hardware to complete the job efficiently.