You've covered everything that I would check. Dunno what else it could be unless your selector on the tree is in not in sycn with the tranny.
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1972 Chevy Blazer 2WD - 400 SBC, bored, ported/polished heads, 9.5:1 dished pistons, Lunati 480/292 cam, electronic ignition, Edlebrock Performer intake, tricked out Rochester 850CFM Quadrajet, long tube headers, Flowmaster 40's, TH350-C with lock-up switch, 2800 rpm stall, shift kit, custom driveshaft, stock GM 12- bolt rear with Auburn Pro Series limited slip 3.73's, 2" drop spindles, 2" drop rear coils, track bar kit, front/rear stabilizers.
1999 30th Anniversary Trans-Am Coupe #1494 - M6, Flow-tech cut-out, Flowmaster, free mods. One of 292 coupes with M6 and in-dash CD.
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1972 Chevy Cheyenne - LWB, factory 402BB
2005 Chevy Suburban LT
2006 Chrysler 300C - SRT8
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