[Benziii]

Originally Posted by PONTIAC LARRY

small block mentality with a big Pontiac , my old 68 GTO automatic TH400 on column and the original 2.93 Safe Track on 26x9.5x14 Hoosier QT Pro DOT on 14x7 Rally 2's with my also 10.5:1 iron head 462 cid with just mild flat tappet hyd cam .465 v.488 lift 224/234 @050 LS 112 , iron 68 intake , 800 Qjet , iron HO exhaust stock 1972-1978 style Carter mechanical fuel pump..... sticking the car on the launch with a stock 13" converter and shifting at 4900 RPM went 12.6@109 even got into the 1.8 60 ft .. Ya got too much gear for a mild Combo and flying past your torque curve therefore your not "riding the torque train" as I like to refer it. Think like ya got a diesel and dont over speed the rpm of the engine that can't really breath and let it stay in the torque curve thru the run in the midrange , no reason it cant run a little quicker than the 3.36 did but since its already changed to 3.70 the other way is a tall as tire change from what ya got or stick some big ass KRE heads on it and a bigger cam

This is great, thanks for the info.

[johnta1]

I'd check all the things you changed, instead of what was there already for problems?

The Strange S60 Rear end like the Dana60 rear end?
If so that is a real heavy rear and possibly uses more HP to use it?
You don't have that much HP to give up I think.

The higher gear probably makes the converter act like a lot lower stall converter? Try a higher stall converter?

Is the new rear and other chassis stuff set up properly?

Try spinning the rear with it jacked up and see how hard it is to rotate?