off-road crawler trans

  • SM420 Transmission for Sale | GM Heavy-Duty 4-Speed Manual with Granny Low Gear (1947-1967)
    Transmission

    SM420 Transmission for Sale | GM Heavy-Duty 4-Speed Manual with Granny Low Gear (1947-1967)

    Product Overview & Specifications

    • In Stock, Multiple SM420 Cores from 1947-1967 Donor Trucks
    • Free Shipping to All 50 States via Freight Pallet, 5 to 10 Business Days
    • All 4 Forward Gears Plus Reverse Function Tested
    • Granny Low 7.05:1 First Gear Engagement Verified
    • Output Shaft Spline Count Documented (for driveshaft / yoke compatibility)
    • Bellhousing Pattern Confirmed (varies between Chevy / GMC / military)
    • Donor Truck Application Documented (Advance Design, Task Force, New Design, Blue Chip)
    • 100% Inspection Before Every Order Ships
    • 15 Day Replacement Warranty on Internal Defects
    (4 reviews)
    $1,499.00 Add to cart