Transmission Revs up between 2nd n 3rd

Tiny
CMPETERS777
  • MEMBER
  • 2003 CHEVROLET MONTE CARLO
  • 3.4L
  • V6
  • 2WD
  • AUTOMATIC
  • 122,000 MILES
Bought the 03 Monte used unaware that the motor had been been replaced with a motor from a 1999 vehicle. I knew nothing about cars but have learned plenty dealing with this nightmare. I had a used tranny put into the car about 6 months ago when, while driving. Barely. I heard a loud cracking sound & within minutes lost all my tranny fluid & before I could pull the car over my radiator started to overheat & out came all my coolant as well! I have never seen so much fluid dump from a vehicle so fast in my 44yrs. I was dumbfounded! As I looked to see what happened I noticed the fluid had come out the sides of my tranny pan and a dent was pushed into the pan from inside the pan. After pulling my pan off I could see that one of the bolts actual blew out with such force it dented the oil pan. I knew then I had a big problem. Still not sure what caused my radiator to crack immediately after my tranny blew, but it did on the right side (driver side.)
I put a new radiator in myself & assisted a friend to put in a used tranny we pulled from a junked Impala. At this point I was unaware that the motor was not the original motor and got a 4T65E tranny that the car is suppose to have in it. I didn't realize then that the 2003 motor is year specific to this transmission, which leads me to my questions. Is my tranny going out due to the change in year of the motor to a '99? Is the missing of 2nd gear that makes it seem like the engine revs up yet bogs down at the same time, something I can fix? The tranny also seems to have a hard time knowing when to go from 3rd to 4th gear as well. Is this all related to the same issue? Can I make this tranny work w this motor or am I looking at replacing both? Please help!
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Tuesday, September 15th, 2015 AT 3:02 AM

3 Replies

Tiny
HMAC300
  • EXPERT
The motor if it runs fine isn't the problem the trans is either the wiring harness isn't making a good connection or wrong connectors or the trans is shot and I think it's the latter due to the first trans blowing an d junk was in in lines and not cleaned out then got into junkyard trans and screwed that one up. Have a trans guy look at it and scan it for codes.
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Tuesday, September 15th, 2015 AT 5:57 AM
Tiny
CMPETERS777
  • MEMBER
Thank you for the reply. Let me ask you though, when you say "junk was in the lines", what lines are you referring too? The cooler lines? I noticed that a pink color sludge is in w the coolant. I flushed the radiator but the sludge is nack again. Could it be that I have a transmission leak in the radiator? The wiring on this car was all jacked up and the transmission definitely needs a new wiring harness & connector. When I got the car I had to replace some of the wiring that whomever it was that replaced the motor had up against the exhaust manifold and it completely melted the wires. Ridiculous! Thanks so much for your input. Sometimes asking repair questions to the guys at the auto shop isn't much help. I think its cause Im a girl!
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Friday, September 18th, 2015 AT 8:40 AM
Tiny
HMAC300
  • EXPERT
There is a trans cooler line that is inside the radiator so it has broken and has put coolant in your trans. It may have dmaged your trans clutch now as you don't know how long it has gone on. Replace the radiator or get a trans cooler separate and hook up trans to that then replace your fluid in trans but talk to a trans guy first as it may be a waste of money to replace the fluid with out getting trans rebuilt.
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Friday, September 18th, 2015 AT 8:49 AM

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