Hey everyone please help me I have spent over $1500 rebuilding my 02J EHC trans with my dad who used to be a master mechanic for GM and all of the other gears work great but it will not go into 1st gear and we even adjusted the cables and everything we are so stumped can you help us out?

I recently purchased my first vw ever. I've always wanted one. Its a 1999 gti vr6 lowered 2 inches on adjustable coils with halo projector headlights. It has 18x8.5 rays rims. And I just put on my catback magnaflow yesterday. Looooove the car so far but im not sure what I should do next? Whats...