No 1st Gear AFTER Transmission Service

The trans worked great before trying to show it some love, with a transmission service. Now it's messed up. Tag along to see where things went wrong.

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Vehicle fitment
04-07 Buick Rainier, 94–96 Buick Roadmaster, 99-00 Cadillac Escalade, 02-05 Cadillac Escalade (select models), 94–96 Cadillac Fleetwood, 93-05 Chevy Astro, 02-08 Chevy Avalanche, 94-05 Chevy S-10 Blazer, 94–02 Chevy Camaro, 94-96 Chevy Caprice, 04-12 Chevy Colorado, 94–04 Chevy Corvette, 03-12 Chevy Express, 94–96 Chevy Impala SS, 94-05 Chevy S-10, Chevy Silverado 1500-2500 (2500 with 6 bolt axle pattern), 93-00 Chevy C/K SUV,Truck, 03-06 Chevy SSR, Chevy Suburban, Chevy Tahoe, 03-09 Chevy TrailBlazer, 04-12 GMC Canyon, 03-09 GMC Envoy, 93-05 GMC Jimmy, 93-05 GMC Safari, 03-13 GMC Savana, GMC Sierra 1500-2500 (2500 with 6 bolt axle pattern), 94-05 GMC Sonoma, GMC Yukon, GMC Yukon XL Denali, 93-96 GMC Vandura, Hummer H3, Oldsmobile Bravada, 94–02 Pontiac Firebird, 04 Pontiac GTO, etc.

04-07 Buick Rainier missing 1st gear, 94–96 Buick Roadmaster missing 1st gear. 99-00 Cadillac Escalade missing 1st gear 02-05 Cadillac Escalade missing 1st gear. 94–96 Cadillac Fleetwood missing 1st gear. 93-05 Chevy Astro missing 1st gear. 02-08 Chevy Avalanche missing 1st gear. 94-05 Chevy S-10 Blazer missing 1st gear. 94–02 Chevy Camaro missing 1st gear. 94-96 Chevy Caprice missing 1st gear. 04-12 Chevy Colorado missing 1st gear. 94–04 Chevy Corvette missing 1st gear. 03-12 Chevy Express missing 1st gear. 94–96 Chevy Impala SS missing 1st gear. 94-05 Chevy S-10 missing 1st gear. Chevy Silverado missing 1st gear. 93-00 Chevy K1500 missing 1st gear. Chevy Suburban missing 1st gear. Chevy Tahoe missing 1st gear. 03-09 Chevy TrailBlazer missing 1st gear. 04-12 GMC Canyon missing 1st gear. 03-09 GMC Envoy missing 1st gear. 93-05 GMC Jimmy missing 1st gear. 93-05 GMC Safari missing 1st gear. 03-13 GMC Savana missing 1st gear. GMC Sierra missing 1st gear. 94-05 GMC Sonoma missing 1st gear. GMC Yukon missing 1st gear. GMC Yukon XL Denali missing 1st gear. 93-96 GMC Vandura missing 1st gear. Hummer H3 missing 1st gear. 94–02 Pontiac Firebird missing 1st gear.