Ok, I have an 88 bronco fullsize with a 351W, it HAD a c6 in it that went bad so I replaced it with a newly rebuilt c6 from a 1986 bronco.
Ran fine for the first day, then wouldn't shift out a first gear(it has a full manual reverse valve body, shift pattern PRND123). When I try to shift down into 2nd gear, the whole truck comes to a stop, like there's something jammed in the tranny, the RPMs stay the same but it just stops. I pulled the valve body to see if anything was binding...but when I did I noticed that there was NO CHECK BALL VALVES. Yeah. There's metal shavings in the trans pan. They're really fine shavings and black in color. Could it be possible that the ***** got grinded up in the tranny? And would it even run with no check valves!? I need some help on this one, I'm trying to completly avoid a tranny rebuild due to not having enough funds, but is it possible that the ***** got grinded with the bands? I don't know much about transmissions...any suggestions to what I should do?? I'd appreciate ANY help from you guys..

 

Who rebuilt your new trans? Warranty?

Contact them.

Good luck.

 

It was built by J.W. transmissions. That's what's stamped on the valve body.
I don't know about a warranty or not..I bought it off of some guy, so I'll have to call them and get the info. Thanks.