97 Grand AM Shifts hard between 1st and 2nd. 97

[debear]

I thought I had this problem fixed. We had found a vacuum line broke into. The shifting improved, but the longer you drive the car the worse the shifting gets. Should I replace the vacuum modulator and see if this works before taking to dealer? Any help would be greatly appreciated.

[fluffybunny]

hmm, is yours an auto or manual? mines an auto and ive got a real hard shift 1-2nd. maybe we got the same problem.....i got my tranny rebuilt new torque converter and all....then the car sat for about 1.5 years with a blown engine ....no ive got it running and i figured it was just dry seals and such....it got better over the past 3 months but still shifts hard.....scratches between 1-2.....

[debear]

Originally Posted by fluffybunny

hmm, is yours an auto or manual? mines an auto and ive got a real hard shift 1-2nd. maybe we got the same problem.....i got my tranny rebuilt new torque converter and all....then the car sat for about 1.5 years with a blown engine ....no ive got it running and i figured it was just dry seals and such....it got better over the past 3 months but still shifts hard.....scratches between 1-2.....

It's an automatic. I just replaced the vacuum modulator and it made no difference. The guy at NAPA suggested an additive, guess I'll try that next.

[redhot97GAGT]

Which addititive? Let us know if it works!

[debear]

Lucas transmission fix. Bought it from NAPA. Fluid is slightly overfilled already so will have to drain some before I can add it. Will let you know if it works.

[debear]

Lucas additive didn't help. A service bulitin I read suggested replacing the control valve body assembly with the updated control valves. Bulletin# 67-71-64.
Does anyone know about what the cost would be if done by dealer. If this turns out to be the problem?