Alright, I need a little help, I have googled this problem a bit and just need some fresh input. My transmission worked great before I pulled it out and rebuilt the engine. It sat on the floor of my shop for probably 3 months without any fluid in it. I put the engine and transmission back in and put a new filter and fluid in the tranny. Now it won't shift out of first. I checked my vacuum line and its in good shape, and my fluid levels are proper. Could it be the vacuum modulator itself? Any ideas, im not very good with transmissions. Thanks.