93 Ruby AT problem any ideas?
Thread Starter
4th Gear
Joined: Mar 2007
Posts: 4
Likes: 0
93 Ruby AT problem any ideas?
Ok I have read the forums (over and over) and read the FAQ as well. Here is my problem:
My Dad has a 1993 Ruby C4 Convertible, and it has a strange auto transmission issue. When running in standard drive mode it shifts and works perfectly no problems. If you are in 1-2-3 though, it can shift fine, but when you take your foot off the gas the RPM drops to idle. When you put your foot back on the gas you have to get the RPM back up to match your speed and then it "catches". I read in the FAQ that the transmission converter was purely mechanical until the 94 model year, when it switched to the electronically assisted type. So it therefore has us stumped. We have also asked several mechanics but no one seems to have ever heard of such a thing, even the GM dealer.
If anyone has any ideas I would really appreciate it. This car only has 45k on it, and we just got new paint, and finally an ECM that works, as well as new speaker amps and weatherstrip.. oh and a new top too! Just this last thing to fix and my Dad can drive it without getting annoyed!
My Dad has a 1993 Ruby C4 Convertible, and it has a strange auto transmission issue. When running in standard drive mode it shifts and works perfectly no problems. If you are in 1-2-3 though, it can shift fine, but when you take your foot off the gas the RPM drops to idle. When you put your foot back on the gas you have to get the RPM back up to match your speed and then it "catches". I read in the FAQ that the transmission converter was purely mechanical until the 94 model year, when it switched to the electronically assisted type. So it therefore has us stumped. We have also asked several mechanics but no one seems to have ever heard of such a thing, even the GM dealer.
If anyone has any ideas I would really appreciate it. This car only has 45k on it, and we just got new paint, and finally an ECM that works, as well as new speaker amps and weatherstrip.. oh and a new top too! Just this last thing to fix and my Dad can drive it without getting annoyed!
Le Mans Master
Joined: Feb 1999
Posts: 9,916
Likes: 38
From: South Carolina
St. Jude Donor '03 & '05
Sounds like your "forward ove run clutch/sprag thingy" PeteK will hopefully chime in.
But first, check your fluid, make sure it is red and doesn't smell burnt in any way. Change filter, and fluid for a cheap check.
Just MHO
But first, check your fluid, make sure it is red and doesn't smell burnt in any way. Change filter, and fluid for a cheap check.
Just MHO
Race Director
Joined: Feb 2004
Posts: 12,517
Likes: 19
93 has a single cage sprag. Sounds like you broke it. The good news is the 29 element, double cage upgrade is only $75.
The bad news is a complete disassembly of the trans is needed, thus an overhaul is in the cards.
The bad news is a complete disassembly of the trans is needed, thus an overhaul is in the cards.
Thread Starter
4th Gear
Joined: Mar 2007
Posts: 4
Likes: 0
Thanks for the reply
I want to thank you both for the replys! Once the first reply came in I started to research online for 'forward overrun' and quickly realized it was deep inside the trans... Well that sucks... I was hoping for a relay or something but at least I know whats up now. I wonder why the techs we asked didnt seem to have a clue?
Thanks again for the info
Thanks again for the info
