Join Date: Mar 2014
Location: Travelers Rest, South Carolina
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My understanding is that the Gear Vendors would give your TH4000 a total of six forward speeds while the 200R4 would give you only four. With GV, you could keep your current convertor, shifter, etc., while with 200R4 you would need new convertor, etc., and you'd have the feared kickdown cable problem...one wrong adjustment, etc. will lower trans pressures and tranny "meltdown". The 200R4 might be cheaper but a built up one for Pontiac torque could easily exceed the Gear Vendors' expense and the GV does have a rep for handling big power easily.
I guess it's a matter of listing all the pluses and minuses of each and deciding which trade off you can best manage, technically and financially.