So ive been planning on doing this for a while but was just too lazy. I used this website. http://www.crownvic.net/tech/4R70Wnotes.pdf
The only problem was in the first step:
• Disconnect the transmission cooler return line where it changes from a hose to a steel line.
There are two lines coming out of the cooler, you want the upper one. Follow it down; it
should still be the upper line at the point of change.
• Have someone hold it steady and point it into an oil pan. Start the car and let it idle while
the transmission fluid is pumped out in a continuous stream. Shut the car off as soon as the
stream starts to sputter or the flow decreases significantly.
On my mustang its a steel line all the way to the tranny so i couldn't drain it this way... I had to do it the messy way. Other than that it was all good.
Ok now to the good part. The shifts are totally improved. Fast and strong. I was alittle afraid that removing the springs would make it too harsh but it doesn't. I floored it going on to the freeway so I didn't get the 1-2 but the 2-3 was so fast the 315 out back couldn't help but get loose. I had to get off the gas so i wouldn't lost it. overall very pleased with the Jmod. can't wait for 4.10's and the tuner!