I have a TH400 with 3.42 gears, Hughs GM25BPO400BP converter, I believe its a 2500 stall. The cam is an ultradyne 274/282 226/233 with .515 lift intake and exhaust with 1.65 rocker, LSA is 112 ICL is 107. Converter is tight on the street and you cant notice its there, does offer some performance increase though.
Not a drop of ping and I run 89 octane, the cam is mild, idles with just a hint of performance, is very responsive on the street. If you search my posts there is a image of the dyno runs and also video link to the dyno run. That was with the flowmaster exhaust, the magnaflow exhaust definately added power and responsiveness, it was quit noticeable.
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