Can’t catch a break, Transmission Trouble

Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic

        So Lisa and I jumped in the GTP for a quick run to Bellingham, as we hit I-5 I quickly noticed something was not right, I got up to 120kph set the cruise and saw the rpms were sitting right at 3000. I looked down it was in 4th it should have been 1900 or so, as we have the 4T65e HD Trans with the 2.93 FD in it.  I shifted from 4th to 3rd and no change at all, shifted back to 4th and no change.   A bit of research on Google says the 4th gear OD clutch has packed it in.  I knew from the get go, that these cars had a glass 4th gear hence why the computer will not let the car shift into 4th regardless of speed if your foot is on the floor boards. It never really worried or bothered me as you can do nearly 130mph in 3rd (about 235kph)  We have never towed anything with the car but apparently its common for these to fail around 120,000 miles.   The only good part about this whole mess is it does not seem that hard to replace the 4th gear clutch pack.  From reading it even sounds like I don't have to pull the trans off the motor, just drop the cradle to get access to the side cover pull a bunch of stuff out, replace the 4th gear clutch pack and put it back together.     
        Anyone else have any info on this?  

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
Capt Fiero Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Founding Member Joined: 12 February 2007 Location: Canada Status: Offline Points: 4039	Post Options Post Reply Quote Capt Fiero Report Post Quote Reply Topic: Can’t catch a break, Transmission Trouble Posted: 05 August 2012 at 4:41pm
	So Lisa and I jumped in the GTP for a quick run to Bellingham, as we hit I-5 I quickly noticed something was not right, I got up to 120kph set the cruise and saw the rpms were sitting right at 3000. I looked down it was in 4th it should have been 1900 or so, as we have the 4T65e HD Trans with the 2.93 FD in it. I shifted from 4th to 3rd and no change at all, shifted back to 4th and no change. A bit of research on Google says the 4th gear OD clutch has packed it in. I knew from the get go, that these cars had a glass 4th gear hence why the computer will not let the car shift into 4th regardless of speed if your foot is on the floor boards. It never really worried or bothered me as you can do nearly 130mph in 3rd (about 235kph) We have never towed anything with the car but apparently its common for these to fail around 120,000 miles. The only good part about this whole mess is it does not seem that hard to replace the 4th gear clutch pack. From reading it even sounds like I don't have to pull the trans off the motor, just drop the cradle to get access to the side cover pull a bunch of stuff out, replace the 4th gear clutch pack and put it back together. Anyone else have any info on this?
	Capt Fiero 88 Fiero GT 5spd V6 Eight Fifty Seven GT V8 5spd.

D_sensitized Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Executive Member Joined: 25 March 2008 Location: Canada Status: Offline Points: 601	Post Options Post Reply Quote D_sensitized Report Post Quote Reply Posted: 05 August 2012 at 4:58pm
	Keep track of every single piece you unbolt. If/When you split the valve passages, do it very carefully, and try not to lose all the ball bearings that will fall out, and figure out where they go. I just tore apart my old 4T60e and there are a lot of pieces in there...
	-Harrison 88GT 3800 SC1 F23 5-speed Chilliwack

Capt Fiero Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Founding Member Joined: 12 February 2007 Location: Canada Status: Offline Points: 4039	Post Options Post Reply Quote Capt Fiero Report Post Quote Reply Posted: 05 August 2012 at 5:09pm
	Holy Crap Harrison, that does look like a lot of parts, I am hoping that I don't have to take that much apart. From what I have read I don't have to pull the bottom off, just the side cover. However if I do need to pull the valve body I will be sure to be very careful. Thanks for the heads up.
	Capt Fiero 88 Fiero GT 5spd V6 Eight Fifty Seven GT V8 5spd.

D_sensitized Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Executive Member Joined: 25 March 2008 Location: Canada Status: Offline Points: 601	Post Options Post Reply Quote D_sensitized Report Post Quote Reply Posted: 05 August 2012 at 6:42pm
	That's the entire transmission. And 90% of it comes out the side, pretty much everything up the the diff. And I think the first thing under the side cover is the valve passages, I'm not sure how deep the 4th gear clutch pack is, but I know a couple aren't too deep.
	-Harrison 88GT 3800 SC1 F23 5-speed Chilliwack