I got a C4 transmission form a wrecker and he assured me it was in good shape. I installed a B&M shift kit following the instructions to a T. Fluid level is good. Bands are adjusted.

Reverse works good. I can put it in drive and it will shift 1st to second with a bit of hesitation but when I get upto speed it it seems to shift into third and then it just revs like it is in neutral. If I stomp on it harder and get the revs up though, it starts to pull but man it does rev really high.

Couple questions

I keep reading about a vacuum line going to the transmission. I cant find a spot for one on mine. Is it only AOD's that have them?

Is it maybe the modulator that came with the shift kit thats giving me problems or maybe needs adjustment?

Or is it maybe a good idea to pull the valve body and check for problems there?

Maybe the tranny was bad lol.

Any help and advice would be great

Thanks

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Grant A LaPierre