Hey guys recently brought a 99 Monte Carlo 3.8 like two days ago lol.And having some trouble! First off I noticed it doesn't have overdrive the transmission shifts smooth like a New one just no 4th gear.Now I noticed the brake lights don't work because of the turn signal switch is bad.I can wiggle it around the brake lights will work.Also I notice the speedometer is off by 10mph according to my GPS.Also i noticed the temperature gauge bearly get above 1/4 Mark.Would any of these affect the overdrive not to work?? Thanks

 

I am sure someone who knows more than I will answer your question but I wanted to welcome you to the forum!!

 

Thanks! I'm afraid it the output shaft splines is gone at least that what normally goes from what I've read.

 

First I would like to say welcome! It's always good to see a 5th gen here, especially a Z34 with an L36. Feel free to ask all the questions you need to.

Make sure that the transmission is up to temp, but it's quite possible that the shaft is bad now. More info here: http://tripleedgeperformance.com/sit...Gear.html#3042

It sounds like your turn signal switch is bad. It's a common problem with our cars.

There's a few things that could cause that. Do you have the factory wheels on or aftermarket? What size are the tires on your wheels?

Your problems are not related to the overdrive problem. It's just a bunch of problems that you have with a used car.

 

Yea the turn signal switch look like it gonna be fun lol.As for the wheel&tire its factory with correct size.So what would else would cause the speedometer to be off