J- Mod

[wolax39]

i always hear people talking about it, but i always miss what exactly it does the the autos, and how to do it. can some one explain how.

 

[streetstang03]

its a tranny mod for the 4r70w auto tranny, named after Jerry, the man who created the 4r70w for the mustang. It is basically a free mod (~$50) if you can do it yourself if you know what you're doing, but i really dont want to attempt messing w/ my tranny. It just involves enlarging the holes in the valve body and removing/replacing some of the springs in the the 1-2 and 2-3 accumalator pistons. The mod is the best shift kit avaliable for the 4r70w and paired w/ some 4.10s will keep up and even beat a stock 5-spd. more info is avaliable at http://www.tccoa.com/articles/tranny/index.html# under the "Modifying Valve Body to Jerry's Specs- Jerry's Mod" link. this is a step-by-step of how to perform the mod. Paired up w/ gears, tranny cooler, and stall converter and you have a hell of a performance auto tranny.

 

[ceyko]

Out of curiosity, is this something Performance/Mustang shops know how to do? This seems like something I'd royally screw up. What is the typical labor on this job?

Thanks,
Ceyko

 

[VicRattlehead]

its a tranny mod for the 4r70w auto tranny, named after Jerry, the man who created the 4r70w for the mustang.

you do know that ford put the 4r70w into more than just the mustang, right? anyway jerry was part of the design team, he wasnt the only one that did the designing.

and the rest your right.

 

[streetstang03]

you do know that ford put the 4r70w into more than just the mustang, right? anyway jerry was part of the design team, he wasnt the only one that did the designing.

and the rest your right.

i thought that he had been part of the team that designed the tranny for the mustang and had been involved in the mustang asspect of it

 

[propellerhead]

Skeptic here... If the J-mod is so good and so cheap, why didn't Ford build the 4r70w like that from the factory?

 

[94GTStang]

Ford builds autos to please the general public. Not everyone wants neck snapping shfits and or firm shifts. Hence why Ford and every other car maker puts a soft suspension on their cars.