Flushed Trans oil for efficiency however it's now slipping

Hello all. I changed my transmission oil to synthetic this last weekend. Flushed it into a bucket which worked fantastically. Now it seems to be slipping. It's not terrible but is a bit annoying. I however am getting the best MPG I've ever had (5+ MPG). Anyone have suggestions on if I should I do anything at all? Will it clear up over time?

Thanks guys!!!

 

What kind of car? Make sure you didn't under or overfill it! Did you change the transmission filter, too?

 

Fill looks to be right on. It is a Ford Escort zx2. Funny thing about the filter. This stupid car has 6mm bolts on it holding all the covers and the oil pan on. Well every time I remove one they snap off. First one I tried to take out of the pan snapped off so I didn't even try... :-(.

Could the filter be the issue? Maybe a shop could take care of it?

Thanks for your reply!

 

Yes the filter could very well be the isssue! They get filthy and cause erratic things like this to happen. Try to attempt it again yourself or bring it to a shop.

 

You could also try using shutter guard.

 

What is shutter gaurd? I thought about taking it to a shop. Bummer I just spent the money on the oil and all. I wonder if they can salvage it? Also have a filter. Lol

 

You might want to go back to the recommended fluid. A new transmission is a lot more expensive than the fuel you will be saving.

 

A shudder guard additive is a transmission fluid additive that prevents or fixes a transmission from shuddering/slipping.

Lubeguard is considered a good brand.

 

You saying going with micron v? The synthetic I got was supposed to be a direct replacement. My old oil is mixed in with my other oils (motor oils :-(). Cousin and at the store recommended the Lucas fix. What is you alls opinion on that?

 

Was the old trans fluid gritty? When they have lots of miles sometimes its better to not change the fluid...

 

Yes it was gritty.... Near the end of the flush it pumped out nasty chunks.

Seems like one way or another it was going to go out. I just sped it up... Lol

 

I still think it'd be worth it to give it another shot and try to replace the filter and use the correct fluid.

 

I know the bolts will not come out without breaking off. Should I take it to a tranny shop and have them remove the bolts and flush it out with some micron v? My fear now is spending more money on this transmission. May be worth to get it dropped out. Would a rebuild help? What does that cost compared to a new one? (I would love to get an MTX in there... But that is a dream)

BTW I tried the Lucas fix yesterday. Worked great when the car was warm. The minute it hit the cold 20 degrees today it was just as bad if not worse...

 

I've never heard that there are any gains to be had after changing transmission fluid on an automatic? Thinner with less drag and loss on a manual I understand.

What's the gain?

 

The good news is that summer is coming so if it's ok warm maybe you'll be OK.

From what you described I wonder if you broke loose chunks of sludge that didn't drain when you changed the fluid. Changing the filter and fluid again would take out most of the left over chunks that would've bypassed your old filter because it was full of accumulated sludge. I'd try a fresh filter before I'd look at rebuilding the tranny.

 

The grittiness prolly kept it from not slipping...

 

Yes I believe this definitely what happened. I think chunks of sludge came out when I flushed it. You believe the sludge got into the filter and is blocking it some?

How would I get the pan off with the bolts breaking off? I guess getting a drill in there with a remover bit could work. What are your thoughts?

If I do this I will get a micron v and go that route. I have been thinking about giving that a shot.

Thanks for all your advice guys!

 

Got a bolt extractor today and gonna try it with the single bolt that already broke off. If it works I'm gonna go to town and install micron v. Worth 40 dollars worth of oil for the try!

 

I have heard from experts in the field of automotive fluids that too much new atf at once can shock the transmission with so much detergency. I go for quick drain and fills, without dropping the pan, every 20k miles.