2007 Uplander LT intermittent problem

!/4 gallon of trans fluid would cause a slip. 1/4 of a quart however would not. This may be a sticking/failing Torque converter solenoid or other shift solenoid not working properly. Unfortunately they done always set codes when they appear to "Fix" themselves as the computer needs to see repeated failure to set codes

Read the guide below on transmission problems, it will shed some light on what you may be looking for

https://www.2carpros.com/articles/automatic-transmission-problems.

It shouldn't, this info will be in your owners manual, 2006 And Prior GM Cars and Light Duty Trucks

2006 Hummer

2006 And Prior Saturn Vehicles

2006 And Prior Saab 9-7X

Equipped With A Automatic Transmission or Transaxle

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
The use of Dexron VI in place of Dexron III.

Recommendation/Instructions:
Dexron VI can be used in any proportion in past model vehicle equipped with a automatic transmission/transaxle in place of Dexron III i.E. Topping off the fluid in the event of a repair or fluid change. Dexron VI is also compatible with any former version of Dexron for use in automatic transmissions/transaxles.

Dexron III must not be used in place of Dexron VI in models that specifically call for the use of Dexron VI, fluid and component life will be compromised.

DO NOT use Dexron VI in place of CVT fluid or in any component that does not specifically call for the use of Dexron III (or any former version of Dexron).

Post back with any other questions.

Ld be tcm module or valve body problem have a trans guy scan for codes

Who's decision was it to get the used transmission in the first place? A lot of the time, the salvage yard will give a small warranty, and that is more than likely for the part alone. They have no knowing of the condition of that part, other than it came from a wreck and may have low miles on it. That and, if they agreed to pay for replacement charges, there would have to be some way that they could get confidence in the person doing the repair. By that, what I am trying to say is this. For instance, the shop gave you the option to go used to keep cost down, and you agreed on the 'good' used part. The reason that you needed a transmission was a catastrophic failure, with that debris was distributed through the system. The mechanic failed to adequately flush the oil cooler of that debris. The 'good' used transmission has now failed, potentially from debris that made it's way from the cooler into the replacement transmission. If you were the salvage yard that sold the transmission, would you feel obligated to pay for labor, knowing that that is a variable? In my experience, used parts are sold at your(or the shops) risk. Now if you were sold a rebuilt transmission from a rebuilder, for them to honor their warranty, there are specific guidelines. In the cases that I have dealt with, I have had to replace the radiator(has the trans cooler in it), and/or the auxiliary cooler, replace fittings if they had a check valve in them, and so on. This was all shown on the original invoice, so if there was a warranty claim to be considered, all of the neccesary documentation was in print. Also in most cases, if they do pay labor, it is at a very low rate, like the supplier would only make up $25.00 of the shops rate of $100 per hour. Unless you the consumer specified that you wanted a used part, it should be between the shop and the supplier. The shops warranty period ought to come into play, you should not have to pay anything, unless of course there is fine print somewhere on the repair order that you signed.