OMC Parts Drawing *Cobra *Mercruiser *Alpha SEI Outdrives
OMC Cobra rebuild kit upper gearcase
Rebuild Kits 21:16 Gear Set Ratio with OMC tech troubleshooting
illustrations with exploded drawing and customer support number
Updated June 4 2026
- 21:16, 21:19, 21:18, 21:17 and 21:21 Gear set ratio assemblies
- Marine engines with 2.3L, 3.0L, 5.0L, 5.7L and 5.8L Ford – Chevy motor outdrives.
- GM or Ford engine years 1986 thru 1993.
- OMC marine tech troubleshooting illustrations with exploded drawing and customer support number.
- Note we will make up any gear ratio needed for upper gearcase GM or Ford Engines.
OMC Cobra Rebuild Gearcase parts
22-962 Aftermarket OMC Cobra Geacase kit ratio 21-16
Parts included
Gear set (most ratios available)
21540 Bearing 983891
21541 Bearing 983892
21542 Bearing 983877
21543 Bearing 983878
87654 Seal kit 987603
12092 Water pump kit 984461
28460 Pinion nut 911753
28320 Impeller shaft yoke 984264
22525 Centering cone 912029
28470 U-joint nut 911937
21676 Washer 911697
23202 Retainer 911752
21111 Cover nut 911751
27920 Bearing carrier 911683
23361 Shim 0.003″ (green) 911678
23363 Shim 0.005″ (blue) 911680
23364 Shim 0.010″ (brown, 2 included) 911681
23371 Metal shim 0.003″ 911662
23374 Metal shim 0.010″ (2 included) 911665
23381 Metal shim 0.010″ 911668
23383 Metal shim 0.003″ (3 included)
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Credit card payment for shipping in USA
22-962 After market OMC Cobra Geacase Kit Ratio 21:16
$1195.00 us
$1493.89 cdn
22-563 After market OMC Cobra Geacase Kit Ratio 21:17
$1195.00 us
$1659.96 cdn
22-565 After market OMC Cobra Geacase Kit Ratio 21:18
$1195.00 us
$1659.96 cdn
22-564 After market OMC Cobra Geacase Kit Ratio 21:19
$1195.00 us
$1659.96 cdn
22-566 After market OMC Cobra Geacase Kit Ratio 21:21
$1195.00 us
$1659.96 cdn