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Mustang Forums
2011-2014 Mustangs
Driveline/Suspension
4r70w questions/issues
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<blockquote data-quote="nyuk98GT" data-source="post: 16228404" data-attributes="member: 166799"><p>03blkann,</p><p></p><p>I can only offer my experience with a 4R70W in my old '98 GT that had 1/3 the horsepower your car is producing. </p><p></p><p>If you are not familiar with the J-mod, it consists of modifying some of the holes in the valve body plate to let select passages fill quicker and updating some of the 'pistons' (servos) located . This makes the shifts quicker but not harsher. </p><p></p><p>Link to J-mod: </p><p><a href="https://forums.tccoa.com/990-automatic-transmissions/106346-tech-article-trains-shift-kit-install-jerrys-mod.html" target="_blank">Tech Article: A-Train's Shift Kit Install - Jerry's mod - TCCoA Forums</a></p><p>This may be a bit dated for your model year transmission but it is good reading. </p><p></p><p>A secondary trans cooler is recommended when running a stall converter (not my opinion but advice from guys who know, lol). I had an FRPP Mustang trans cooler in series (after the in-rad cooler) and it helped to keep the oil temperature from getting too warm. I do not remember the trans oil temperature in my old car but I may have some ancient datalogs (i'll look for them). </p><p></p><p>There are a bunch of transmission control parameters in the tune. From the basis of SCT Advantage (ProRacer), I had access to tweak shift points, lock points, pressure, filling times, etc., and your tuner will have access to even more parameters to modify and perfect the behavior of the 4R70W. </p><p></p><p>In the older model years, the OD band was a weak point and WOT shifts (into 4th/OD) were strongly discouraged. The J-mod helped to fill the OD valve quickly to apply maximum clamping force. I presume that the OD band material is much improved now. </p><p></p><p>That's about all I can offer. I hope it is helpful info. </p><p></p><p>Chris</p></blockquote><p></p>
[QUOTE="nyuk98GT, post: 16228404, member: 166799"] 03blkann, I can only offer my experience with a 4R70W in my old '98 GT that had 1/3 the horsepower your car is producing. If you are not familiar with the J-mod, it consists of modifying some of the holes in the valve body plate to let select passages fill quicker and updating some of the 'pistons' (servos) located . This makes the shifts quicker but not harsher. Link to J-mod: [URL='https://forums.tccoa.com/990-automatic-transmissions/106346-tech-article-trains-shift-kit-install-jerrys-mod.html']Tech Article: A-Train's Shift Kit Install - Jerry's mod - TCCoA Forums[/URL] This may be a bit dated for your model year transmission but it is good reading. A secondary trans cooler is recommended when running a stall converter (not my opinion but advice from guys who know, lol). I had an FRPP Mustang trans cooler in series (after the in-rad cooler) and it helped to keep the oil temperature from getting too warm. I do not remember the trans oil temperature in my old car but I may have some ancient datalogs (i'll look for them). There are a bunch of transmission control parameters in the tune. From the basis of SCT Advantage (ProRacer), I had access to tweak shift points, lock points, pressure, filling times, etc., and your tuner will have access to even more parameters to modify and perfect the behavior of the 4R70W. In the older model years, the OD band was a weak point and WOT shifts (into 4th/OD) were strongly discouraged. The J-mod helped to fill the OD valve quickly to apply maximum clamping force. I presume that the OD band material is much improved now. That's about all I can offer. I hope it is helpful info. Chris [/QUOTE]
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