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Discussion Starter #1
Can jerry's mod be performed on a 2001 mustang gt? If so, are the steps the same or are some parts different? I want this thing shifting hard/firm- needs to handle 400-450 hp. thanks
 

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1. Yes

2. Same proceedure, just some parts are already updated- do a quick search for 01 gt tranny

3. No problem. Question is, can the internals and the rest of the driveline handle it?

Jay
 
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if you want a shift kit or whatever, just drill the plate per jerrys specs and remove the 2-3 spring.

If you want a race spec transmission to support 400+ at the wheels then your stock 4r70w is not going to cut it.

And jerry outlines how to build up a 5.4 truck trans.

JH
 

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Discussion Starter #4
Thanks, right now i will be running around 300-320hp to the wheels, the 450+ is about a year away, in the mean time i want my tranny to shift real hard, real fast.
 

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And then there will be the rearend issues. But since you have a Mustang the parts are easier to come by to correct those problems.
 

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Darrin, I almost forgot about the rearend troubles you are having. Thats alright we'll manhandle that thing by spring at least. I may have a hookup on a brand new set of 4.10's for you.
 

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Discussion Starter #8
I also have a diablosport predator tuner, would it be a bad idea to increase the line pressure with j-mod? Also, can you guys describe the different levels of the mod from mild to aggressive? I really want close to a race car feel when it shifts, but i don't want it to be undrivable in wet weather.
 

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Line pressure should only be increased at the shift point. If you increase line pressure at all times you will eventually destroy the transmission. As for the shifts, I have the mild J-mod and with 3.73 the tires do chirp even at 3500 rpm. I have never felt the 300+ jmod so I could not tell you what it feels like. In rainy weather I have to ***** foot the car, sinc first gear is absolutely useless and even when the 1-2 shift comes at low rpms it tends to kick the rear end out a bit.
 

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yup

I've got the 300+ hp setting on my trans. I'm running a 351C V-8, and it's an 03 stang trans. At WOT I spin going into 2nd and 3rd. Shifts are F I R M:diablo:. At light throttle, its firm, but not enough to knock your fillings out. Real streetable for my tastes anyways. I've got a Baumann TCS controlling the trans also. I'm VERY happy with the J-Mod/TCS combo. :cool:
 

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I have a 300+ J-mod and it's fine for the street. I also run a 2800stall 10inch converter and don't make very much power :( I get a sideways action on 1-2 at wot. it is a little too firm for most people ,but for cruising in the rain if you lift of the throttle for the shift you will be fine.
Alan
 

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I did an all out j-mod on mine and I have a 3800 stall converter. I can do rain, but with the wide tires and the stall, snow is absolutely impossible.
 

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I've got the harshest JMod you can do, along with a chip that bumps the line pressure during the shifts, and I drive mine daily with no problems. The converter really softens up the low rpm shifts around town also.
 

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Discussion Starter #15
Ok, from what i've read i am definately going with the most aggressive j-mod setup. Since i have a 2001 model 4r70w, which parts exactly am i going to need to do the mod? I was told i wouldn't need to update some parts like on older models. Part #'s would be great if applicable.
 

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2fast4uGT said:
Ok, from what i've read i am definately going with the most aggressive j-mod setup. Since i have a 2001 model 4r70w, which parts exactly am i going to need to do the mod? I was told i wouldn't need to update some parts like on older models. Part #'s would be great if applicable.
Well, that depends. Are you going to tear down the transmission at this point and change out the planetary gearset and restack the clutches?
 

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PoweredBy351C said:
I've got a Baumann TCS controlling the trans also. I'm VERY happy with the J-Mod/TCS combo. :cool:

Wow, Someone else with one :=]
 

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WkStill said:
Wow, Someone else with one :=]
So you've got the TCS also? How much have you played with the different inputs? I'm having a blast with it. I just talked with Greg today; I was asking him q's about the TC lock up adjustability, and any updates in the future. I've got no complaints. It's rather nice being able to tune as you go.
:headbang:
 

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PoweredBy351C said:
So you've got the TCS also? How much have you played with the different inputs? I'm having a blast with it. I just talked with Greg today; I was asking him q's about the TC lock up adjustability, and any updates in the future. I've got no complaints. It's rather nice being able to tune as you go.
:headbang:
Well, I have had it since Oct 2002 (with over 25K miles now) .. I do have two shifts setup, pos 1 is normal (lockup @ ~50) and 2 is no lockup, shifts are the same.

I dislike the TC Lockup setup, and LPC Options. (ie, it would be nice for a Increase LPC by x% on shift) Although, when karl designed it in 97' it was sufficent, but now, in 05' its not, from my understanding "Karl" is working on a new design.. But I have yet to been able to commincate with him, I have sent karl over 5 emails, and have yet to ever get a response from him, Greg on the other had is 1 top notch guy, and he doesn't even understand why karl won't reply back to any of my emails.
 
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