Shifts flawlessly until warm, then UGH ...

[Joshua Dale]

Friends, back again with my 2001 Sport trac - it shifts perfectly when cold, but once warmed up, shifting from 1st to 2nd, and 2nd to 3rd are very lumpy and jerky. Can prevent jerk if let off the gas during then shift ... continues getting worse and worse as it heats up.

Any thoughts? Thanks. Up on stands now - ready to pull the pan. Not very many YT vids to watch. 5r55e tranny 4WD truck.

 

[DILLARD000]

...2001 Sport trac
...shifts perfectly when cold
...warmed up, shifting from 1st to 2nd, and 2nd to 3rd are very lumpy and jerky
...Can prevent jerk if let off the gas during then shift
...worse as it heats up

Would try these remedies in order listed:
* Insure Trans MerconV ATF Level is proper; recommend RedLine#HighTemp\30205 or AmsOil#ssmv\atf1g
* ATF Refresh, recommend every 4kMiles\6Mths: HandPump 1qt old ATF from TransDipTube, 1qt new MerconV;
drive 10+ miles see if improves, repeat 2 times
* HandPump 1qt old ATF from TransDipTube, add 1qt of LucasTransmissionFix\LTF (high viscosity ATF);
drive 10+ miles see if improves
* Full Trans Service, recommend every 33kMiles\4Yrs: Drop Pan, Remove Old Filter, Retorq ValveBodyBolts, New Filter & PanGasket & 5~7qt MerconV, Band Adjust
* Trans ValveBody\VB Rebuild: New VB BondedGasket & Solenoids & ReverseServoGasket+ORings & ShiftKit
* Full Trans Rebuild\Replace

 

[Joshua Dale]

Well, I've gotten this far - neither gasket blown out ... I'll put her back together with new gaskets, re-torque all, and new filter - re-torque bands.

Question, should I go ahead and have vbody rebuilt/check solenoids while I'm this far in? Don't know the cost yet.

 

[Joshua Dale]

PS - could it be that damn internal speed sensor?

 

[Dmiranda1269]

Would definitely replace the solenoid pack first.

 

[DILLARD000]

Did you use an OBD2 Scanner to get the active TroubleCodes?
That will help you narrow down the specific cause,
less of a WildAssGuess\WAG compared to randomly throwing parts+money+time at the problem.
Now that you've got the ValveBody out, may still be able to turn IgnitionKey to ON (not START !!!),
then read the TroubleCodes stored in the PCM.
Do need a Scanner that reads both StandardSAE & ProprietaryFORD data;
many older cheaper scanners, like some that are free to use at part stores,
only read a basic abreviated list of StandardSAE TroubleCodes, not including Tranny data.

 

[Joshua Dale]

Would definitely replace the solenoid pack first.

so all 5 ?? or just the 3 ?

 

[Joshua Dale]

Actually 6 - Valve Body - Main Control & Servo's - 2001 Ford Explorer Sport Trac

 

[Joshua Dale]

REVERSE SERVO COVER GASKET has a small blowout ...

 

[Joshua Dale]

took solenoid ohm readings - EPC is at upper limit ...

 

[DILLARD000]

REVERSE SERVO COVER GASKET has a small blowout ...
took solenoid ohm readings - EPC is at upper limit ...

Appears you're doing a thorough ValveBody work up, finding the problems.
Do keep us updated on what else you find & end results.

 

[Joshua Dale]

Alrighty, here's an update - decided to just get a rebuilt valvebody since it didn't have Sonnax updates that I could determine. Was about the same after the core charge as just replacing the solenoids and such. Used https://www.wittrans.com/ Whatever it takes transmissions.

Arrives tomorrow. We'll see! More to come.

 

[Brett H]

Thank you for taking the time to share the updates!

 

[Joshua Dale]

Ok, new VB arrived - installed and torqued. Pan on, torqued to specs! New Mercon V arrives Sunday ... I know, I know, I should have just went to the store lol - Core ready for return to WITs Trannys.

Hoping I didn't miss anything!

Bands adjustment next! Have to figure this out though as the cable is in the way sort of ...

 

[Dmiranda1269]

When I did the valve body on mine, I was glad I replaced the solenoid pack at the same time. Figured at the time it was just under $300 and at least I had to take the pan down just once. Hopefully it works perfect when you get the fluid. I just went to Walmart for the mercon v

 

[Joshua Dale]

Ok, kids - how in the heck to you access the area to adjust the tranny bands? Geeze ... take off the 4WD drive bar and shift linkages? What a pain in the arse. Can't find a video on this.

 

[Joshua Dale]

Ok, took almost 8 quarts of Mercon V - shifting flawlessly and so quietly so far!! Gonna take to shop and have bands torqued by a pro since I don't have the tools for that small area! I hope this works long term!!

 

[Dmiranda1269]

Ok, took almost 8 quarts of Mercon V - shifting flawlessly and so quietly so far!! Gonna take to shop and have bands torqued by a pro since I don't have the tools for that small area! I hope this works long term!!

Awesome to hear

 

[Joshua Dale]

Well, drove great for a little while - Check engine light and Overdrive light flashing ... stopped by AAMCO and they pulled a P0715 code. Looks like it is a speed sensor ...

 

[JohnPenny Peluso]

Well, drove great for a little while - Check engine light and Overdrive light flashing ... stopped by AAMCO and they pulled a P0715 code. Looks like it is a speed