so i replaced my valve body with a rebuilt unit,i replaced the TV cable with a factory correct part. i replaced the govenor assy.and the servo assy AND NOW.....it shifts normally,the car drives as it should.and im one happy boy,indeed

 

well. as luck would have it put 50 miles on it in 4 days and now back to super high shift points.same as before. what a waste of $330

 

It's possible theres so much debris in the oil (clutch/band material, metal, etc.) that it is interfering with the shift valves in the valve body. A spec of dirt can cause them to not work well or at all. Is the governor matched to the valve body?

 

im beginning to think the 700 r 4 is a weak and badly designed transmission. I have began looking around here and elsewhere.and im finding WAY too many GM vehicles that are otherwise fine cars EXCEPT they had a bad trans and got it rebuilt, they HAVE a bad trans that needs rebuilt,or they have a trans that WILL need to be rebuilt sooner than later. you guessed it , they have 700-r-4s or its evil twin , a 4l60-e. I would rather keep my car all original, as its a nice rust free car.but hell a manual trans of ANY kind would beat this ****, hands down. and really ,my only comfort is its NOT a ford!!

 

The early ones usually went south around 60k miles. The '87 and later ones are a bit better.

In stock form it's not a transmission that will take a lot of abuse (like treating it like a manual). I also feel that these things die from neglect, mis-adjusted TV cable and a general mis-understanding of how this transmission is designed to work (poor rebuilding practice).

I have 86k no-abuse miles on the one in the IROC. I have a 4L60E with 130k in my GMC Safari that's still going (it's always had a funky 1-2 shift, though).