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1966-1974 El Camino Muncie M20, M21, M22 4 Speed Transmission Synchro Assembly

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Replace your El Camino's worn, damaged, or broken M-20, M-21, M-22 synchro assembly with this brand new unit. This syncro installs between the 1st and 2nd gears and the 3rd and 4th gears and engages and disengages those gears when shifting. The M297-15 sliding sleeve and M297-2.5 hub are heat treated for aggressive shifting or daily driving. The WT297-77 keys are fitted to each assembly and the 591914 tension springs are spring steel and fitted for maximum positive pressure in neutral or when shifting in and out of gear.

Retail Price

$69.95

Your Price

$66.95

You Save: 4%

4.29%)
  • Ground Up Part # FMSYNCRO-6674
  • Manufacturer Part # FMSYNCRO-6674
  • Brand Ground Up
  • Sold As: Kit
  • Eligible For Discounting w/ Promo Code No
  • Eligible For Free Shipping w/ Promo Code No
  • Shipping Details: This item ships UPS Ground.


Replace your El Camino's worn, damaged, or broken M-20, M-21, M-22 synchro assembly with this brand new unit. This syncro installs between the 1st and 2nd gears and the 3rd and 4th gears and engages and disengages those gears when shifting. The M297-15 sliding sleeve and M297-2.5 hub are heat treated for aggressive shifting or daily driving. The WT297-77 keys are fitted to each assembly and the 591914 tension springs are spring steel and fitted for maximum positive pressure in neutral or when shifting in and out of gear.

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