subject heading says it all ..after spending hours dropping everything reading the instructions carefully ,fit the thing back together (covered in atf) start the car ,,.........everything looks good till i put it in reverse ..anyone had similar problem ?? if so what did you do to fix it ???

BTW its a B&M transpak

 

I had the same problem with one I did about 5 years ago!... The pressure regulator where you put the spring in, then the piston, and have to hold it there while you put the C-clip in had fallen out... I'm pretty sure you know which piece I'm talking about, 'cause it's a pain in the *** to get in. Problem was, the C-clip that came with the kit was too thick, and didn't seat in the groove right!. I reused the old one, and got reverse back!! I hope this helps you out... Sucks to waste all that fluid! I had trick shift in mine

 

Yes that will do it. While you have the clip out double check your PRV valve assembly to make sure its correctly assembled most of the time it will fall out anyway if the clip comes loose.

Shift kit time is always a good time to install a $6 drain plug.

 

That's exactly the same issue I'm having. I double checked the clip when I put it in, and have never had that problem on the 15 or so other times I've done this! Of course I would have to develop problems on my own car! All forward gears work fine (not driving, just on the lift) but I can't back it out! LOL

I should have put in the drain plug, I even bought one! I think I will now that IO have to drop the pan again! I gues I was just trying to keep from jinxing myself!

 

I'm almost too embarassed to say what was wrong with mine!

I left out the reverse boost sleeve and valve. In my defense, the transmission has been sitting apart for about 6 months, and the last 700 I had apart was about 4 or 5 months ago. I had gotten to the point where I was in a hurry to finish the build, and overlooked that one little thing! The TV boost sleeve (aftermarket with o-rings) was a PITA to get back out without the spring pressure pushing it out! I finally found a magnet strong enough to do the job, but I still had to work it in and out to get it out!

I guess this just backs up the need for attention to detail, and double checking EVERYTHING!

My next problem is with the TCC wiring being different, and 1-2 shift seems to happen too quick. All else seems fine!

 

yep that was the problem the B&M clip is noticably thicker than the GM clip
re installed using GM clip and all is well .......what a pita job to do

 

Glad it fixed it, man!! I know you're relieved!!

 

Yeah, I have all gears now, and I'm driving it. At WOT, everything is good, other than the shift points are early (governor). At part throttle (1/3 and less) the 1-2 and 3-4 are real early, and the 2-3 late. Gonna get the governor right, then mess with the springs on the shift valves (I used the reprogramming kit, and the "syskokal" (green and black box) kit (Transgo). I may make another post if I don't find anything with !