When I bought my 82 a about 1 1/2 ago the trans blew about 4 days after having the car. I brang it to the Cheverolet dealer and they installed a new GM 700R4. Anyway I get the thing back expecting nice snappy shifts and the thing is like a complete slush box. Downshifts are terrible like it doesn't fully engage and the same for the upshifts. So I complain and they tell me that's the way it is. Well now the damn thing won't stay in overdrive. I'm on the NJ Turnpike heading north from Exit 3 going home to exit 8A. Well 65mph it constantly shifts in and out of overdrive so I push it to 75 and it stays. Then all of a sudden it starts going in and out of overdrive again. Well this continues, so I continue to increase the speed to keep it in overdrive. Well now I am doing 95mph and the damn thing is in and out of overdrive. so anyway to keep this short I think my clutch plates started to burn up because it was smoking like hell and the shifts were not crisp they were long and dragged out. What could this be? I see everyone on here loves there 700R4 but mine has been nothing but a dissappointment. I actually considered getting rid of the car. i have an appointment to drop it off but I don't think there going to fix the sloppy shifting.
Woe is me :sad:

 

Are you sure that it's upshifting and downshifting between 3rd and 4th or is the torque converter locking and unlocking?

 

Can you take it to a different dealer to at least get them to look at it? Sounds like they did something wrong when they put it in and now you're getting the shaft.

Damn that sucks :mad

 

No flame and I'm not trying to rag on you but, your first mistake was getting a 700-r4 from a GM dealer, the second mistake was not taking it in when it started failing to lock up, the third mistake was not installing an auxillary transmission cooler. Now the dealer should have been able to adjust your TV cable to make sure your car shifted properly. The lockup is controlled by a solenoid, the solenoid is supposed to be controlled through an electrical system. On your car that is probably controlled by the ECM. The guys who are retrofitting 700's into their earlier model cars are either using a manually operated lockup switch, a vacuum actuated switch or a transmission pressure activated switch to control lookup.
At the dealer you probably paid way too much for an inferior transmission, I doubt that it was a "new transmission." It might have been, but I'd bet on a rebuilt unit. GM hasn't made any 700-r4's in a number of years. They are manufacturing the 4L60-e which is the computer controlled version of the tranny. I don't know, maybe your Crossfire ECM has the ability to control a computer transmission. If you have a computer tranny then the shift points, shift crispness are adjustable through the ECM and the dealer should have known this.
But if not then the it really sounds to me like your TV cable wasn't adjusted correctly and that's what fried your clutches. The dealer should have made sure that it was correctly installed and adjusted.
Check with forum members in your area and find a reputable transmission rebuilder, who will rebuild your current tranny with heavy-duty Corvette parts.
The transmission cooler is always a good idea on any automatic Corvette, heat kills automatic transmissons quicker than anything, and if you can add a $30.00 cooler to hold down the heat, it is money well spent.

 

All it needs is the no 4-3 downshift parts. GM fixed that problem by 87 or 88. So you got an old junker 700 probably with the smaller input shaft and smaller pump.

I'd find out the part number of what they sold you and the part number of the later quality 700's. I'd say that you got the shaft!