GJS440

Well, I'm at a crossroads on what transmission I should consider for my new setup, either a powerglide or a th400? New combo is a twin turbo ERL 427 looking to push between 1000-1300rwhp. Car is going to be just a weekend toy/street car with some 1/4 mile track time. Car is a full weight 1999 convertible trams am, I would say somewhere in the range of 38-3900#. I like the idea of only 1shift and the milder launch with a powerglide but worried I'm too heavy. I will have either transmission built for my power level with a transbrake and converter to match my setup. Which of these should I consider? Any help would be much appreciated.

Jake's Performance

iTrader: (2)

A TH400 will be more streetable.
They will both likely perform similarly at the track. If you are at the higher end of the power (1300) the Glide MIGHT have a slight advantage. At the lower end, TH400 done properly will go faster.

At your weight and power, if it were mine, it would get a TH400. TH400 will be less expensive too.

GJS440

Thank you for the info! I have always considered the th400 but researching the fact with a glide has a milder launch with those power levels, loss in extra weight and the gain in parasitic horsepower. I was beginning to consider the glide as an option. I have a new transbrake already for a th400, so it looks like your professional opinion will keep me building the th400. Thanks for the help!