HELP! A904 skipping 2nd gear.

when the front servo engages...2nd...it pushes on the band strut which is nothing but a small piece of metal that pushes the band to tighten around the drum...

so you got serveral things in play...front servo...band strut...an adjuster that tighten or looses up the strut...and the band...which has lugs on it that engage the band strut...