I recently change the tranny fluid with 6qt of castrol dosmestic multi-vehicle formula.

http://www.castrol.com/castrol/secti...tentId=7027043



The tranny is now slipping at higher rpm. Tranny is smooth and shifting normal through all gears including overdrive ONLY if I keep the rpm low below ~3000.

If I drive it like I stoled it or if I need to quick acclerate. Anything above ~3000rpm and it will slip completely (as in 100% slip). As soon as the rpm comes back down to ~2500 she lockup again.


I think it is the fluids. It was not slipping prior to the fluid change. Anyone experience this with Castrol ATF Domestic Fluid?

 

Well I would start there. What you need to do is a complete flush of the system and then the correct type fluid in there.

I suggest that you take it in to a Ford quick lube place and get the trans flushed. They can heat the fluid and rinse it out. A little pricey but much better than where you are headed for right now.

Try not to drive it till you can get it done is my best advice.

 

I have no experience with that fluid, but it should not cause a problem. It meets the specs that your trans was designed for.

Check the fluid level with the trans warmed up and the engine idling in park. Low fluid could do this. So could a loose internal filter.

 

fluid level is good. I only put in as much as I sucked out. It is on the correct making on the stick while engine is idling in park.

as for the loser internal filter. I didn't take the pan off. I only sucked out the tranny fluid. I stick the tube in as far as it could go. Could it be possible that the tube knock the filter off it's installed position?

In your 9 year of ford auto tranny engineer. have you ever seen anything like what I just described?

 

What I find weird is that from that web page: "Do not use this ATF in applications calling for MERCON® V "

Since Mercon V is now spec'd for EVERYTHING that ever used Mercon or Mercon V, I find it very strange they would say it's not Mercon V compatible.

HOWEVER, it still should be OK because your 4R100 called for plain Mercon to begin with.

I'm with Mark: Low fluid.

 

Yes, it's possible, but not too likely.

2007-1988 = 19.

Yes, I have, and it was due to low fluid or a loose/misinstalled filter.

 

It makes sense to me. The biggest difference between MERCON and MERCON V is that V has anti-shudder additives. Running MERCON in a trans that requires MERCON V will usually result in torque converter and shifting shudder.

 

Oh, it makes sense to me TOO... technically.

Marketing wise, and after Ford went all-Mercon V, it's just weird.

 

MERCON V can replace MERCON, but MERCON cannot replace MERCON V.

 

The link for the tranny fluid also stated not to use in applications calling for Mercon V and Mercon SP. I would get that fluid out of there asap.

 

Is there not a drain plug on the transmission ?

Did you have any trans issues before the change?

I would think the first thing to do is remove the fluid.

 

no drain plug, either remove the pan or go for a flush. In the ops case he needs a flush to get it out of the torque converter.

 

My 05 PSD SD had a drain plug on the tranny, but no way to drain the converter. A flush and filter change seems to be the best way to go and hope no damage is done.

 

From the owner's manual from ford official website.

Ensure the correct automatic transmission fluid is used. Transmission fluid requirements are indicated on the dipstick or on the dipstick
handle. MERCON and MERCON V are not interchangeable. DO NOT mix MERCON and MERCON V. Refer to your Scheduled Maintenance Guide to determine the correct service interval.

Some transmission fluids may be labeled as dual usage, such as MERCON and MERCON V. These dual usage fluids are not to be used in an automatic transmission that requires use of the MERCON type fluid. However, these dual usage fluids may be used in transmissions that require the MERCON V type fluid.

MERCON and MERCON V type fluids are not interchangeable. DO NOT mix MERCON and MERCON V. Use of a transmission fluid that indicates dual usage (MERCON and MERCON V) in an automatic transmission application requiring MERCON may cause transmission damage. Use of any fluid other than the recommended fluid may cause transmission damage.

https://www.flmowner.com/servlet/Con...OwnerGuidePage

http://www.motorcraftservice.com/pub.../00f23og3e.pdf

 

So let us know what you do the results.