They say the th400 as far as durability is "one of the best, if not THE best, transmissions ever made." heres a link to the info. click on the comparisons link and go down to th 350 then to th400 and compare, I like the 400 having gone thru 2 350s myself.
http://442.com/oldsfaq/oftrn.htm#TRA...n%20Comparison
GR-RRR!
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1970 GTO 458 CID .040 over 4 Bolt 428 Block, Forged Eagle 455 Crank, 295 CFM SD KRE D-Ports, SD Old Faithful HR Cam + Comp HR Lifters, PPR Maxx-lite rods, Racetec pistons, PRW 1.65 SS Rockers, 900CFM Holley HP TBI, Performer RPM, Hooker Super Comps, 3" X-Pipe into 2.5" mufflers/tailpipes, 2.75 1st TH400, Continental 13" Converter, 8.5" 3.08 Posi.
Everything installed, fired up and tuning has begun!
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