To my knowledge the SCT adjusts peak line pressure, but the 4R falls short is its lack of ability to sustain line pressure needed to hold bands and clutches, and also from compromising gear overlap. Valvebody modification through the j-mod or supplied parts in a shift kit help alleviate this shortcommings. Also getting in there you replace the 1-2 accumulator piston/spring with a proper one which helps as well, since with all the adjusted line pressure in the word, that being faulty the line pressure means didley for the 1-2. The 2-3 isn't the greatest either.JMOD doesn't sound of interest to me. I like the way my SCT adjusts firmness. I need to buy a tranny cooler before I upgrade valves. Still need to "make an appointment" to take my car in for rear end gears at HP here in Jax.
To my knowledge the SCT adjusts peak line pressure, but the 4R falls short is its lack of ability to sustain line pressure needed to hold bands and clutches, and also from compromising gear overlap. Valvebody modification through the j-mod or supplied parts in a shift kit help alleviate this shortcommings. Also getting in there you replace the 1-2 accumulator piston/spring with a proper one which helps as well, since with all the adjusted line pressure in the word, that being faulty the line pressure means didley for the 1-2. The 2-3 isn't the greatest either.
+1
With the later models, 99-04 Jmod do you still remove the springs from the accumulators or leave them alone?
I can't seem to find any information on this, even after reading Jerry's "AODE/4R70W Bible".
I'm going to be installing my Jmod plate this week and was wondering.
I just want slightly firmer shifts and to get rid of the "sliding into 4th" crappy shift that these units have.
So should I leave the springs/accumulators alone?
I have a 2003 GT and have a cooler already installed.
TIA..
For those that may not already know, here is the link to everything you've ever wanted to know (except my question !) about the AODE/4R70W.
http://www.tccoa.com/articles/tranny/index.html
JMOD doesn't sound of interest to me. I like the way my SCT adjusts firmness. I need to buy a tranny cooler before I upgrade valves. Still need to "make an appointment" to take my car in for rear end gears at HP here in Jax.
This is actually what you want: TCCoA Transmission Article - Index
Have a look at page 12: TCCoA Transmission Article - Page 12
Have a look here for common symptoms everyone:
TCCoA Transmission Article - Page 4
And yes you want to replace it, i think even the 4R75W of 2004 should have it replaced.
And these are the two parts you'll want to add steve:
1-2 accum pistonF7AZ-7F251-AA - $9.17
2-3 accum piston F7AZ-7H292-AB - $5.88
Wow, that's odd but awesome. Glad everything went as well as it can. Do you run a tranny cooler?
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