At a Glance
- Condition: OEM used, all 4 forward gears and reverse tested
- Availability: In stock, GM 4L60E transmissions available
- Shipping: Free shipping to all 50 states via freight pallet, 5 to 10 business days
- Donor vehicle confirmed (Silverado / Sierra / Tahoe / Suburban / Yukon / Escalade / Camaro / Firebird / Corvette / Roadmaster)
- Engine pairing documented (4.3 V6 / 4.8 / 5.3 / 6.0 Vortec / 5.7 SBC / LS family)
- Model year and generation identified
- Lock-up torque converter function verified
- Electronic shift solenoid function tested
- Pan inspected for metal contamination
- Output yoke spline verified (27 spline, 0.810 inch diameter)
- No core charge required
- Backed by a 15 day replacement warranty against internal defects
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SM420 Transmission for Sale | OEM Used GM Heavy-Duty 4-Speed Manual with Granny Low Gear (1947-1967)
Rated 5.00 out of 5
2 reviews
In Stock
At a Glance
- Condition: OEM used, all 4 forward gears plus reverse function tested
- Availability: In stock, multiple SM420 cores from 1947-1967 donor trucks
- Shipping: 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
- Backed by a 15 day replacement warranty against internal defects



