Heavy Duty Speedometer Block Off Plug Kit For TH350 TH400 Transmission Fits 1968 To 1981 Chevrolet GMC Buick Classic Muscle Car Turnkey Swap Seal Set

Single Aluminum Speedometer Block Off Plug Kit For Auto Drives
✔️ CNC aluminum seal plug With ring Fits 22.6mm and 0.89 inch mounts

This single piece block off plug kit seals your tail housing when you swap to a digital speedometer sensor. You slide it straight into the factory opening of your classic GM or Buick drive train without drilling or cutting sheet metal. The upgraded silicone O ring locks out dirt moisture and keeps pricey transmission fluid inside the casing.

✅ Compatible with TH350 and TH350C Turbo Hydra Matic tail units ✅ Replaces part numbers like 25513247 and A44774 for exact fitment ✅ CNC turned from T6061 aircraft grade aluminum alloy body ✅ Stops slippery fluid seepage around the 17 to 22 tooth gear cluster ✅ Snaps onto the housing in minutes with basic socket wrench ✅ Blocks legacy analog ports cleanly in durable silver color

💡 What causes mechanical speedometer drive failures in classic automatic trucks? - Factory plastic gears crack under heat stress or strip their internal spline housing - Swapping to this handy aluminum block seal stops internal oil creep around the rotating shaft - You secure a flat mounting face for digital pickoff sensors without messy fabricating work - Hardened billet metal fights road salt and engine bay temps so your readout stays dead accurate

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