Thread: Anyway to tell if I have a custom tune?

The GXP's speed limiter is alot higher.

I would advise against ever going that fast. 4th gear at those speeds is just asking the transmission to explode. And you've likely reduced its life to some sort.

And a 2500-2800 stall is likely what the car has.

Thanks guys, I wasn't sure about those few things. As for reducing trans life, as long as the case is still good I will just build it the was it should have been. Sorry guys I'm not comfy building a trans for anybody other than myself.