2005 Chevy Uplander transmission problems...

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7,428
Location
FL, USA
Today when driving on the highway in the Uplander (2005 Chevy Uplander 3.5 V6) The trans would clunk then shoot the RPM up to around 3500, it feels as if it just drops out of over drive for no reason, then after this happens, you let off the gas and the engine revs down to 1000 RPM. Its odd, after driving for a mile or so of 3500 RPM at 70 MPG the TC will lock back up, but almost partially it seems like. About 5 miles later the same thing happens again. I get a clunk and the RPMs shoot up to around 3500 RPM. Here is a pic of me cruising at 70 after the clunk, and I let my foot all the way off the gas, it sits at 1000 rpm.... **NOTICE, the trans IS in drive, not neutral. To get any power you have to step on the gas and it just revs to 3500 RPM where the trans catches (assuming 4th gear) and will start to pull the van. Again, after a mile or so of this the TC will decide to lock up a little. NOTE: this is on our rebuilt transmission going on 2 years. What could the problem be?
 
Messages
12,925
Location
Northern Kentucky
I'm guessing you're not aware of the inferior rebuilds being produced by shops these days. If you look at the post I linked they show what they replace at power source verses other shops. If 4th gear is going in and out especially on hills then they didn't replace your 4th gear input shaft with the proper hardened unit. If they didn't do that, they didn't do much. How long was their warranty? They did just enough work to make it 12 months I'm guessing.
 

gregk24

Thread starter
Messages
7,428
Location
FL, USA
Originally Posted By: 901Memphis
I'm guessing you're not aware of the inferior rebuilds being produced by shops these days. If you look at the post I linked they show what they replace at power source verses other shops. If 4th gear is going in and out especially on hills then they didn't replace your 4th gear input shaft with the proper hardened unit. If they didn't do that, they didn't do much. How long was their warranty? They did just enough work to make it 12 months I'm guessing.
They are supposed to be a good shop, the local police department uses them when they need a rebuild. We do have a warranty for another 2 months so hopefully they will take it in.
 
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17,301
Location
OH
There are rebuilds and there are rebuilds. A good rebuild involves replacement of all of the parts known to cause failures. A cheap rebuild involves reusing any part that's within service limits. You may not have gotten a good rebuild. You posted some time back asking what oil or OCI would be appropriate to this van. I replied somewhat snarkily that if I owned a 2005 GM minivan, engine oil would be the least of my concerns. I'm very sorry to have been right. You might have an easy to fix problem, though. I'm sure that we'll hear from somebody with more knowledge of this tranny than you or I. There are also specialist boards you might try.
 
Sadly many rebuilds are just really repairs. Many rebuilds are just a unit that is taken apart and JUST the parts that failed are replaced since the rest will probably keep going for a while. Much cheaper than replacing every single wear item in there. I personally think there should be a different term for these simply repaired items. Rebuild should mean rebuild, not patched up in my opinion. This is simply the world we live in where you get a 1 year warranty and hopefully for them it doesn't grenade before then. If I were you I would work that warranty you have left for all it is worth. Get on it tomorrow and let them know what it is doing. I would also not keep driving it this way because if you really blow it up they will blame it on neglect and deny the warranty claim. Anything so they don't have to fix it.
 
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12,925
Location
Northern Kentucky
Compare what power source replaces on the left with what others might on the right. I am going to be getting one of their units since i have a similar 4T65e issue with my Buick.
 
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3,392
Location
Raleigh ,NC
Originally Posted By: 901Memphis
Compare what power source replaces on the left with what others might on the right. I am going to be getting one of their units since i have a similar 4T65e issue with my Buick.
That's not close to good enough. Some of these OE parts should not be used. Use upgraded parts to solve the known issues with these transmissions. You want a better than new transmission using upgraded kits such as the ones made by Sonnax.
 

gregk24

Thread starter
Messages
7,428
Location
FL, USA
Originally Posted By: GSCJR
Let's not confuse rebuild with re manufactured, there's a big difference. Including costs respectively.
A rebuilt should include all soft parts replacement as well as any broken hard parts. A re manufactured transmission only has a used "shell" and all the internals are brand new. I know this, my Accord has a Honda Factory "re manufactured" (new) transmission.
 

gregk24

Thread starter
Messages
7,428
Location
FL, USA
Also guys, would this issue be easily detected by a scanner of some kind, because if it goes in...I am sure they "wont be able to replicate the problem" and will try and shew us out the door. I wont reveal the shops name as of now, but so far I am not all that impressed.
 
Messages
8,598
Location
Florida
My dad's Pontiac G6 transmission acted weird, but there were no error codes. Finally, a MAF code appeared, and a rebuilt MAF made the transmission shift normally. Sometimes a transmission can be in good shape, but the TPS, MAF, and other sensors can cause the transmission to do strange things. If it is determined that your transmission has totally failed, using Lucas transmission additive can delay the inevitable rebuild. I wouldn't use it in a good transmission, however.
 
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