There are a bunch of threads that are stickied. The JMod doesn't require a new valve body. You re use your existing one. It's basically all about upgrading some Pistons in the transmission to the later improved piston design. And enlarging a couple of holes in the the separator plate to increase the line pressure on the shifts. It's essentially a "Shift Kit" that's approved by one of Fords Driveline engineers that helped develop the tranny. By combining the valve body mods with a fluid change. And adding a trans cooler the fluid life is prolonged and the trans life is increased. It's important to keep in mind that the trans needs to be in good shape to begin with. It's not a cure all.That's what I kinda figured to do because I have no records from the previous owner and since I've had it which was at 117k miles now 136k there has always been torque shutter. I figured out how to prevent it mostly from either acceleratin or slowing down. Canceling OD helped me with that quite a bit. However as mentioned above I feel as if the trans forgets what gear it's in. I figured best case scenario have them j mod it and replace the valve body. I was just afraid it'd be so bad considering it had no fluid in it. Can anyone point me into the direction of possible threads or diagrams I can give to my shop and tell them hey this is exactly what I want?
If you google JMod you can find a couple of youtube videos that go a long way towards helping you understand the process. And you should probably buy the parts from the Ford Parts Counter listed in the buy and sell section. You'll get genuine ford parts at the same price as aftermarket generic parts. My order shipped very fast also. But NC is only a day away from ohio.
Here a list from Brandon's JMod build thread. The prices have gone up slightly since then but not horribly so.
JMod Part Numbers
F75Z-7F284-AA 1-2 Accumulator Upper Spring $3.59
F4AZ-7F247-A 1-2 Accumulator Retainer Cover $4.79
F7AZ-7F251-AA 1-2 Accumulator Piston $13.19
F7AZ-7F284-BA 1-2 Accumulator Lower Spring (optional, used to soften the 1-2 shift) $31.21
F7AZ-7H292-AB 2-3 Accumulator Piston $7.19
F6AZ-7A098-A Tranny Filter $19.32
XW7Z-7D100-AA Separator Plate Gasket $1.61
1L3Z-7C155-AA Separator Plate Gasket $1.55