Yes this is a stock transmission, like I said, it is out of a stock 87 GN and it is holding up so far. As far as power goes I am not sure how much hp my engine makes but it is not a stock 455 and the torque is always evident with these motors. Those GN's made some serious torque all at once off the line my brother had a Buick turbo T-type and that thing pulled harder than my car did so I don't know why they break so easily except that the TV cable has to be correct or it will burn them out quickly.buzz77 said:84GP455 said:The one I have is a BRF code from a 87 GN which I think had those improvements, as long as your TV cable is adjusted correctly that is the most important thing, these transmission's are very sensitive to TV cable settings. You could burn up a brand new transmission with all the bullet proof parts you want in 10 minutes if that cable isn't adjusted properly. I've been beating on mine pretty well since 2012
Is this a stock Transmission? How much power is your 455 making? I've always found the so called stage 1 hi performance 200 4r rebuild with skepticism. If the GNX produced 276hp and 360 foot pounds of torque net, these transmissions should hold up to most stock muscle car era engines without the need to beef them up. Why dish out 1600 to monster transmissions or whomever to 'bullet proof" it to stage 1. Yet others say the torque of the late 60's early 70's engines would destroy an overdrive transmissions.
