Hi Guys,
I have a 92 C4 convertible with 46k miles, LT1 and a 799R4 transmission. The car has always been well maintained and have never had any issues with it. This past weekend I took it for a lengthy drive through the canyons of Angels Crest highway along with the Porsche Club of America . While I was the only non german vehicle in the caravan I was made felt welcome from the go. The ride was roughly 90 miles going up and down some great turns and right after our mid way break at mile 70, I noticed my car was not behaving properly. While coasting at about 45 and preparing for the turns the car started shifting strangely, going into tall gears when the slowing down and then when I would give it gas it seemed like the gears were lasting way too long and then they would literally throw you like a slingshot. My initial thought was that I may be low on ATF. I pulled over and checked for any suspicious scents or anything leaking. I found nothing wrong, the ATF is not burnt nor does it look black, it is a bright color red. I did not have any warning lights in the DIC. The car was idling just like a sewing machine (smooth and even) and at a stop sign I gave it gas and it felt like it was starting out in 4th gear. I shifted manually for a few miles and then finally hit the highway to get home. Once I got off the highway I had zero issues and nothing like what I had experienced. I did a little bit of research and thought of the possibility of it being the TV cables. I did not want to mess with them so I took it to my mechanic who is more interested in keeping his customers happy rather than selling them stuff one does not need. After having the car for a day he called me today to say that I have a fantastic 92 vette in awesome shape. There was nothing he could find wrong. Do you guys have any suggestions?

thanks

 

See if there is an issue with the downshift cable being out of adjustment. After that, how long has it been since you dropped the tranny pan?

 

Before you change things like the TV cable adjustment , how old is the trans fluid? It may have just been hot from your “spirited” ride up the canyon. After it cooled later the trans shifted fine, correct. Trans fluid can absorb moisture and will cause ***** shifting if older (even with low miles). GL with your diagnosis!

 

thanks for the replies. The TV cables were not out of adjustment. Just to make sure I took it to my local (dependable) mechanic and he concurred that nothing is out of adjustment. No codes, no issues what so ever. The ATF looked fine but as Jmyer58 points out, once the car cooled off it shifted normally. This weekend provided we have no rain (a given here in california) I will taker out out again for a spirited drive and see if I can replicate the symptoms. I can not say for sure how old the ATF is but maybe changing the filter and oil may not be a bad idea. Given the low miles I did not think it may be that the oil but perhaps that is a starting point since everything else looks good.