It was always slow and I think when I bought it the motor may have been going.
You can rebuild a seat motor like a starter; the big deal is always grease turned to glue, and the copper rotor connections get burnt and don't connect.
YOu can usually fix them with sandpaper, by spinning the rotor with a drill, and touching some 220 or 400 grit sandpaper to the copper, then spray it clean with cleaner that won't dissolve lacquer. I always slightly sand the ends of the brushes, if they look burnt. Don't make them shorter, lol.
You can order brushes by size on the web, if the springs are wasted. If it's overheated, the springs on the brushes may have lost their tempering.
I'd say those don't have bearings (probably bronze bushings), but if they do clean them out, and relube.
Relube everything, reassemble, and it's good as new.
Red '96 Cougar XR-7 240k mi. '02 4R70W, PST DS : '03 PI engine, 04 maf, 24lb injectors, 2.5" exhaust, '02 4r70w + Jmod, DirtyD0g TC + cooler + 3/8" lines, 255 walbro fp. Alpine system.
Black '96 Cougar XR-7 (Lazarus) 210k mi PI Intake, '02 4R70W, Jmod, PST DS, GrogTune, Konis, Mark LCA+Poly, racecougar Custom Engine Chain, and JL and racecougar Bracing.
Black '97 Tbird Limited Edition, '02 4R70W, 255 walbro, PST DS, PBR Brakes&SS lines, Toicko Blues & Springs, GrogTune.
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