Will transmission fluid change help slipping?

Hi I have a Volkswagen Jetta. When I first start driving the transmission is cool but then after about 30 minutes of driving the transmission starts to shift hard into gear. I've been driving the car like this for about  1000 miles. When I leave the car sit for about 30 minutes and it cools off the transmission is fine then after 30 minutes the transmission starts to shift hard in gear again. I wanted to know if I change the transmission fluid in the car do you think it will fix the problem? Or could it be something else causing this issue? My mechanic said I just need to change the transmission fluid in add a bottle of Lucas and it will fix the problem. I just want to get everyone else's opinion or what they think before I spend more money. Thanks 

The Devil2020-02-24T21:00:37Z

I seriously doubt changing the ATF will fix what's worn out. Go on and try the Lucas additive. That's sure cheaper than rebuilding the transmission- and you will need it rebuild some time in the future.

13

John2020-02-24T12:41:21Z

The fluid will not fix it.

13

D.E.B.S.2020-02-24T01:57:05Z

I'm not a mechanic but had a similar problem with an old Isuzu.  It shifted HARD intermittently.  (I thought I was leaving my transmission in the street sometimes.)  Mechanics told me to service the transmission with new fluid, etc.  It didn't help at all.  None of them had any good ideas which didn't involve a significant amount of money to just guess at what it might be.  This was years back, but at some point I think there was a conclusion it was probably a sensor that was going bad.  The temperature affected how well it worked.  I sold the vehicle prior to going down that road though.

So in my case, changing the fluid was useless.  

31

thebax20062020-02-23T23:36:04Z

You stated it was slipping in the title. If it's slipping you're going to need a rebuilt transmission soon.
If it just shifts hard I'd do an ATF drain and fill.
DON'T flush it.

02

oklatom2020-02-23T21:42:06Z

No idea.  Is your mechanic a goood one?  If so it might help.

Or it could be a problem with the transmission cooler. 

I'd go for a second opinion and then decide what to do.

30
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