Get J-modded!

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majorownage

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That is all.

I love it! Only a top 1-2 accum spring, and none in the 2-3. Not rough AT ALL. :D

Now that my trans *might* handle it, 125 zex here we come!
 
Did that in my '93 with an '03 Mustang GT trans... pretty cool having a stock car that can easily chirp 2nd gear... and sometimes get sideways in 2nd gear!
 
I highly recommend the j-mod. I did it to my '95 Thunderbird and it totally multiplied the fun factor by 10 (and I removed 2-3 spring, put stiffer spring on top of 1-2 and left lower 1-2 spring stock).

My '95 LSC chirps on the 1-2 and I haven't done a thing to the tranny. That kind of scares me because I'm thinking a spring must be broken in the 1-2 accumulator.
 
slowmkviii said:
I don't get that if your already in there spending money on fluid and time why only do half the job.
Click to expand...

I brought my car to a local shop, explained what I was doing. He dropped the pan and valve body, and I did the rest. He saved the fluid and strained it back in.

$50 well spent.
 
Well, if you want to do a little more, you can change the EPC solenoid to the higher pressure XL3P, drill a little hole in the VB dam to keep the converter charged, replace the shift solenoids & OD Servo. You can also install aftermarket Sonnax elevated valve/spring kit, pressure regulator & bypass clutch control valves, and 2-3 shift valve bore plug. If your tranny is pre-96, you can install the dimpled pan & filter.

Aside from those changes, I don't know anything else to be done that doesn't require tearing the tranny apart. Some of those changes must be included in the Baumann kit you mentioned.
 
I have all of my springs in and it shifts nasty and chirps 3rd gear at 80 mph on street tires with the 4.30 gears. On the Mickey Thompsons it dead hooks and squawks the 1-2 at the track. No 3rd gear chirp on the drag radials though.
 
My 97 has also been known to chirp the stock tires @ 75 mph or so on 410s with jmod only.

Jmod is great
 
Yeah, it's definitely a huge difference from stock. I used to nod off behind the wheel between shifts :p And once you have experienced the JMOD and understand the dynamics of it and what it does, now I cringe every time I watch a 4R70W shifting in the stock form just draaaaaging the clutches. LOL
 
J Mod is cool and all but I prefer doing it in the tune. For me the Jmod is too harsh under normal driving.

And ive been in VR4s Mark when it chirped 3rd gear. Impressed the hell out of me. I knew I wanted a Mark when I has my 89 Mustang GT and Steve was next to me at a light and stomped me which was cool in itself but when his car went to second and I saw the ass slide a little into my lane I thought that was cool as fock. :lol:
 
LaserSVT said:
J Mod is cool and all but I prefer doing it in the tune. For me the Jmod is too harsh under normal driving.

And ive been in VR4s Mark when it chirped 3rd gear. Impressed the hell out of me. I knew I wanted a Mark when I has my 89 Mustang GT and Steve was next to me at a light and stomped me which was cool in itself but when his car went to second and I saw the ass slide a little into my lane I thought that was cool as fock. :lol:
Click to expand...

I did the j-mod to my gf's car and since I put a lower spring in the 1-2 accumulator, it isn't harsh at all. She is VERY PARTICULAR, and told me before I went to do it that we are not kids and it better not shift hard!

It doesn't shift hard at all; however, if you get on it, the shifts are super firm and super crisp. I know you can adjust shift points and pressure slightly with a tune, but I find it hard to believe you will ever have the control you do when you're in the valve body. Even Ford knows that, most of the j-mod holes Jerry tells you to drill already exist in the late-model 4R70Ws, and the springs get firmer as the years get later.
 
NetKeym said:
I know you can adjust shift points and pressure slightly with a tune, but I find it hard to believe you will ever have the control you do when you're in the valve body. Even Ford knows that, most of the j-mod holes Jerry tells you to drill already exist in the late-model 4R70Ws, and the springs get firmer as the years get later.
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Find it as hard as you want to believe. Ask Marked8murder or Sapperfire Or TwinBiPo if you cant make the tune perfect. So smooth at partial throttle its like it never happened and perfect pressure for a leisurely pass or break the tires into second AND third at WOT.

Drilling holes is drilling holes. They flow that extra fluid all the time. With the tune you can pick EXACTLY how much you want it to flow vs rpm vs load vs speed vs tps vs air temps
 
LaserSVT said:
Find it as hard as you want to believe. Ask Marked8murder or Sapperfire Or TwinBiPo if you cant make the tune perfect. So smooth at partial throttle its like it never happened and perfect pressure for a leisurely pass or break the tires into second AND third at WOT.

Drilling holes is drilling holes. They flow that extra fluid all the time. With the tune you can pick EXACTLY how much you want it to flow vs rpm vs load vs speed vs tps vs air temps
Click to expand...

I know nothing about tuning, but I know how that transmission works, that's why I'm so skeptical.....

But if I can have it shown to me, hey, I'm always willing to learn!
 
LaserSVT said:
With the tune you can pick EXACTLY how much you want it to flow vs rpm vs load vs speed vs tps vs air temps
Click to expand...

Not exactly. What you can do is adjust the pressure, but if the holes in the plate are too small, then you won't get the flow that you're looking for.

Doing the J-Mod increases the range of the adjustments that you'll have in the tune. You'll be able to achieve the same results with less pressure, which is better for the transmission.

Best to do the J-Mod AND the tune. :cool:
 
I'm sick of the SLOW shifts on my 98' and it's past it's trans fluid change time. So while I have the pan down I'm deciding on what way I'm going?
 
The best decision is an informed decision so in my opinion at least call becontrols.com
They will give you all the info you need and can explain why jmod is good but not as good.
This is why I spent the extra money on one of there recalibration kits.
 
I don't know a whole lot about the workings of automatic transmissions, but by doing the jmod or messing with accumulator springs does it in anyway change the shift points? or does it strictly affect the firmness of shifts only? The reason I ask is because if there is one thing that bothers me about mark viii's it's the 4r70W trans..I can't stand how it shifts, if under anything less than half throttle I feel that it shifts WAY too soon and causes the car to bog down in an RPM range where there is no power what so ever. Is there a way to change shift points to carry them out longer during normal driving (partial throttle)?
 
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