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post #1 of 18 (permalink) Old 11-26-2006, 10:20 AM Thread Starter
 
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J-mod?

I did several searches and cannot find out what this is. I read it helps quicken shifts but doesn't the tuner do a good enough job of that as I see guys list both in their sigs? Thanks, mark
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post #2 of 18 (permalink) Old 11-26-2006, 10:26 AM
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http://www.tccoa.com/articles/tranny/index.html#

3rd one down

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post #3 of 18 (permalink) Old 11-26-2006, 10:31 AM
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It is everywhere check the technical articles page (transmission). You modify the valve body plate, and put updated parts in if necessary. By firming the shifts with the tuner only can cause problems as that increases line pressure, yet your valve body is not altered to handle that. So you have to start off with a j-mod first then can firm the shifts up some more. I think you can though change the shift points and such without a j-mod with no problems. It's just not recommended to increase line pressure without having it done.

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post #4 of 18 (permalink) Old 11-26-2006, 10:37 AM
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in a nutshell it is a shiftkit using ford parts.
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post #5 of 18 (permalink) Old 11-26-2006, 04:15 PM
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Why is it that every time I read any detailed information about the J-Mod here in the tech articles it is CLEAR that it can only be done during a full rebuild. It includes hard parts deep inside the transmission.

Yet I continually see folks talking about doing a J-Mod at a meet in a few hours. That is why I am confused.

I HAVE searched. I HAVE read about 2-3 hours worth of data on the J-Mod and am MORE confused now then I was when I started.

How can it be a "shift kit" when it involves replacing internal parts. Maybe there are multiple "levels" of J-Mod? I did see that the "FordPartsCounter" guy listed parts for a 'mild' J-Mod.

I am getting more confused the more I read.

Can anyone clear this up for me?

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post #6 of 18 (permalink) Old 11-26-2006, 04:22 PM
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Quote:
Maybe there are multiple "levels" of J-Mod
correct, and the mildest level is replacing the 1-2 and 2-3 accumulator pistons, and drilling out some holes in the valvebody.

for a full j-spec tranny you would have to rebuild the entire tranny.

clear as mud?
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post #7 of 18 (permalink) Old 11-26-2006, 04:23 PM
 
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All your doing is dropping the pan taking out the valve body drilling some bigger holes in certain ones and upgrading 2 of the shift accumulators thats all your doing. Your not going deep into the tranny and yes it can be done within a couple hrs maybe less if you have done it b4. And the levels are changed by i believe a couple holes that are made larger in the different levels to get an even more firm shift
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post #8 of 18 (permalink) Old 11-26-2006, 05:21 PM
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there is modifying the valve body and then there is modding the entire trans. 2 different things. do one or the other or both.

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post #9 of 18 (permalink) Old 11-28-2006, 06:36 PM
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Yep, the J-mod is all within the valve body area. Doesn’t require dropping the trans (thank god) lol.

From what I understand, the different "levels" of the J-mod basically is how fast and hard it shifts. And yes, it’s actually good for the transmission to do the J-mod because the clutches don’t drag so much between shifts.

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post #10 of 18 (permalink) Old 11-29-2006, 11:37 AM
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Quote:
Originally Posted by DScruggs
Why is it that every time I read any detailed information about the J-Mod here in the tech articles it is CLEAR that it can only be done during a full rebuild. It includes hard parts deep inside the transmission.

Yet I continually see folks talking about doing a J-Mod at a meet in a few hours. That is why I am confused.

I HAVE searched. I HAVE read about 2-3 hours worth of data on the J-Mod and am MORE confused now then I was when I started.

How can it be a "shift kit" when it involves replacing internal parts. Maybe there are multiple "levels" of J-Mod? I did see that the "FordPartsCounter" guy listed parts for a 'mild' J-Mod.

I am getting more confused the more I read.

Can anyone clear this up for me?
http://www.tccoa.com/articles/tranny/index.html#
1st link is the full tranny rebuild to j-spec.
2nd and 3rd were pulled from 1st to do just the shift-kit portion of it.
2nd is upgrading the accumulators and pistons and which springs to replace/remove.
3rd is modifying the valve body.

In the 2nd most at least change the 1-2 accumulator to the updated style and leave the bottom spring out and update the 2-3 accumulator and leave the spring out on it.

In the 3rd you drill the separater plate out to the level of HP you are producing.
Just make sure you find the correct pic for the valve body year you are using as some of the holes moved in 98, I believe.

An external tranny cooler is also recommended to futher extend the life of the tranny.

2nd and 3rd is done with the tranny in the car, unless you happen to have it out for another reason.

Hope I got that right and helped clear it up a little. It confused the heck out of me when I first heard about it. I did all my research and got it done in about 6 hrs. taking my time and double checking everything before I drilled and put it back together.

Rob

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post #11 of 18 (permalink) Old 12-04-2006, 11:40 AM
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I'll add a few questions.
1. What kind of 0-60mph increases and 1/4mile increases can be had with a mild j-mod?
2. On a scale from 1-10, for a guy that's never torn into a tranny. How hard is this mod?

Justin McC
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post #12 of 18 (permalink) Old 12-04-2006, 11:45 AM
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I bought a modded valve body from Alan .

I dont know about the increases in 0-60 but it will shift faster .

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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post #13 of 18 (permalink) Old 12-04-2006, 11:52 AM
 
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Quote:
Originally Posted by Stinkfist04
I'll add a few questions.
1. What kind of 0-60mph increases and 1/4mile increases can be had with a mild j-mod?
You might see some what of an increase but not much. Your going to need a better TC and gears to help out with track times
2. On a scale from 1-10, for a guy that's never torn into a tranny. How hard is this mod?
Your really not ripping apart the tranny, all your doing is dropping the valve body which is a piece of cake and drilling some holes. Id say its about a 4 at most. You just gotta pay attention to were everything goes and make sure everything goes back into together right
-Matt-
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post #14 of 18 (permalink) Old 12-04-2006, 12:50 PM
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well i already have the maurader Tc and explorer swap so i'm already use to the feel of that mod..lol stock gears though.. and i haven't searched in depth on the mod but does it always shift snappy or when your puttin' around does it shift relatively smooth (for the sake of the girl..haha)

Justin McC
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post #15 of 18 (permalink) Old 12-04-2006, 01:06 PM
 
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Without a tune from lonnie it just slightly firms up the shifts some. You will feel it immediatly in the 1-2 shift. I dont know how hard it will shift without the tune at WOT because i never really got on her without it lol but with the tune its a great
1-2 and 2-3 shift. Its night and day difference from the stock shifting just takes alittle bit used to thats all. I would do it and put a cooler in while your there to keep the heat down and flush it with mercon v tranny fluid if u havent already. Also how many miles on your tranny??

-Matt-
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post #16 of 18 (permalink) Old 12-04-2006, 03:14 PM
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130k. i already have a tranny cooler installed and a tune w/ firmer shifts.. firm enough to chirp second..

Justin McC
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post #17 of 18 (permalink) Old 12-05-2006, 01:37 PM
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Quote:
Originally Posted by cjchevez
I bought a modded valve body from Alan .

I dont know about the increases in 0-60 but it will shift faster .
What did it cost you?

Justin McC
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post #18 of 18 (permalink) Old 12-05-2006, 01:52 PM
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Quote:
Originally Posted by Stinkfist04
What did it cost you?

Just pm Dirtydog or if you really want the price I paid pm me .

1997 Ford Thunderbird 4.6 Sport .

60'...... 2.06
1/8th .. 9.194
mph .... 77.13

mods*
PI heads *PI intake*Mark VIII torque converter*Cobra T-loc w\4.10's * Jmod*tranny fluid cooler*P&P stock T/B & plenum*UD pulleys* Dynotech 4in ds*80mm Lightning maf*Xcal2*02 GT intake tube.
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