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Discussion Starter #1
Folks my '97 4.6 Sport model's transmission just yesterday started shuddering kind of weird when going into the OD gear it happened all of a sudden, and also after switching to "OD OFF" it goes into 3rd gear kind of weird as well almost like it doesn't go in completely the first try then goes in a second time type feeling.
Is this the 4r70w like I have in my '94 F150 behind the 302? or something else?
Car only has 53k original miles we are the second owners no racing or rough use, fluid and filter was changed 2 years ago when we bought it, any ideas?? THANKS!!
 

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Drain the pan and the Torque Converter via the plug, replace with Mercon V fluid and add a transmission cooler to extend the tranny's life. If this does not solve the problem, the TC should be replaced. Chances are on a 97 it's still got lots of life left yet, theyre a little better than the 94-5 ones.
 

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Discussion Starter #3
I've heard of Mercon V fluid, but how is it different from the regular Mercon/Dextron, and when you say drain the t/c shouldn't I remove the pan and change the filter as well?? its really the only thing I know to do on this trans.
if it were older I'd change the vacuum modulator valve but I guess thats out of the question anymore.
I've heard that this type of problem could be caused by the valve body coming loose and just needs to be re-torqued, what do you know about that? Thanks!
 

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Yes, it's a good idea to change the filter when you remove the pan. Mercon V is a semi-synthetic fluid which better protects the parts inside against the heat in the transmission.

FYI: The valvebody at this kind of mileage won't come loose on its own. If it's ever removed and reinstalled, it should be properly torqued 3 times in the proper sequenece. I've done it this way several times, and never once have I ever had to retighten them.

At first all this electronic stuff will appear overwhelming, but once you get used to it I think you'll come to like it.
 

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Discussion Starter #7
Thanks everyone!!!! I picked up a trans filter kit and some valvoline Mercon V fluid tonight and will change tomorow and advise.
 

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Discussion Starter #8
Just wanted to report that my problems are solved!!!!!!
Changed filter and fluid (including the t/c) went with Valvoline's Mercon V fluid, shifte get better with each one!!!!
Thanks very much for the suggestion!!!!!
 

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im glad i read this, i have the same prob, i guess im gonna do a lil trans work here soon and i have an electronic shift kit on its way, only $40 from jegs and it should help some also
 

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ditch the electronic shiftkits(if it is the B&M shift improver kit). it just raise the line pressure in your transmission and it is VERY BAD for your tranny. it'll kill your tranny in no time.
 

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What you want is the J-mod. chapters 13 and 14 of the OD 101 tranny article. Also the other 2 of the top 3 tranny articles for info on installing it.
 

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Discussion Starter #13
UPDATE: Wife has been driving the car all week, all is good I think, except possibly 3rd gear, its MUCH better than before, but I think it could stand to be a bit firmer of a shift (the 1-2 are great as are 3-4) should I consider the J MOD?? can someone please guide me to where I can read up about it?
And is the B&M electronic shift kit really so bad?? Thanks!
 

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As I understand, the B&M shift kit raises line pressure across the board, which will work for firmer shifts, but the excess pressure wears the servo seals more than necessary, so you will be paying for a rebuild sooner. The higher pressure also generates more heat and load on the pump. The PCM maintains line pressure just high enough to keep the clutches from slipping, given the torque the engine is making. The Jmod speeds up the clutch and band engagement/disengagement without messing with the line pressure. It is the way to go & worth the extra effort.
 
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