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.
__________________ 2008 F250 PSD Crew Cab 4x4, X-liner,
Cooper Discovery STT LT275/70R18's
Skyjacker dual steer stabilizer
Banks Ram Air & 6-Gun, Upfitter switches
Ravelco Alarm System, Frontier Extreme FT. Bumper
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 MERCONŽ 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.
__________________
- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
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.
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.
__________________ Mark
Former Ford automatic transmission engineer, 1988-2007.
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.
__________________
- art k. - Moderator for the Superduty, V10, and FE forums
'01 F250SD SC SB XLT V10 4x4 auto 3.73 Warn hubs Volant CAI, eBay headers and y-pipe - 5-star custom tunes on SCT X3
'97 Cougar XR7 30th Anniv Edition 4.6L
'74 F250 Highboy FE390 deceased! I've been wrong before, I'll be wrong again. Just wait and see.
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.
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.
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2008 F250 PSD Crew Cab 4x4, X-liner, 
