Hello.

I've replaced the tranny in my 89' G30 6,2 Van from a 3-speed to an 91' 4l80e. This seems to work fine, speedo works and I don't get any error codes in the system.

But I have one question. When I floor the throttle, the tranny shifts from 1-2 at around 42km/t (26mph), and from 2-3 at 82km/t (51mph). I mean it should go up to around 60km/t (37mph...) before it shifts from 1-2, and close to 100km/t (62mph) before it shifts from 2-3.

Isn't that true? I'm not sure any longer

I tried adjusting the TPS, but still the same.