j mod

[tristang]

so is the j mod for auto trannies or what. i think that it is but it did not really say.

if so i think that im going to do it.
this is like the only one i found.
http://www.vapauto.com/jmod.htm

and i guess ill do the spacer too.

http://www.vapauto.com/spacers2.htm

what do u guys think.

[Dave04Mustang]

yes its for auto's. It basically firms up the shifts however you can do all of that by just buying a hand held tune and reflash the computer to change shift points and firm them up

[JackThe Ripper]

Originally Posted by Dave04Mustang

yes its for auto's. It basically firms up the shifts however you can do all of that by just buying a hand held tune and reflash the computer to change shift points and firm them up

not the best way to do it though. Jmod is a lot better on the tranny.

from what i understand the guy (jerry) origionally designed a pretty good auto tranny, however, ford thought it was too agressive and tamed it down a bit by sizing down some of the holes, which is why our trannys feel a bit confused sometimes. The jmod puts it back to the origional specs.

total in parts it costs you like 15 bucks to do it, i havent done it, always wanted to but im hesitant to start monkeying around in there.

research the shit out of it, there are some bad instructions floating around, and more than one person jacked up thier transmission, but if you do it right apparently it makes a world of difference.

[tristang]

i was just gona get the parts and take it to a shop. im not gona start messing aroung with the tranny me self.

[spike_africa]

Swapping a valve body is very very simple. If you own an hanyes or chilton manual it has the direction on pulling it out i do beleive and its very simple. A tuner is the worst way to firm upo shifts as it makes the front pump work harder and will wear it down over time (been there done on that on my old F150). A valve body mod is a much better way to firm the shifts back up. There is a write up on this all over the internet aswell to show you how simple it is.

This is from one of our forum members:
http://www.dndgarage.net/jmod.htm

[tristang]

so this spring im getting the mustang detailed. then should i go for the j mod or the exaust first. im on kinda a tight buget.
what do u guys think

[tristang]

so i want to have the j mod the intake manifold spacer and the mac v6 cat back exaust all befor ford nationals in carlisle. so im gona shell out a few bucks till then i guess.
but that might be my hole mod budget for the summer.
mabe

[01FR500]

If your going to do it sooner or later, and have the money now, go ahead and do it. You will have more time to enjoy it.

[Redrum]

if i buy all-J-Mod Kits for the 4R70W ,99-04 3.8L Splitport Mustang Spacers and The Windstar Intake Kit (99-04 3.8 Mustangs) will i have more hp and torque? if i buy all three?

[spike_africa]

The jmod can be done for a few dollars in parts and then new fluid and filter. Its a must do for an auto car and you should add a tranny cooler to as heat kills auto trannys. Best $50 mod for an auto car is a tranny cooler.

[tristang]

Originally Posted by Redrum

if i buy all-J-Mod Kits for the 4R70W ,99-04 3.8L Splitport Mustang Spacers and The Windstar Intake Kit (99-04 3.8 Mustangs) will i have more hp and torque? if i buy all three?

from what i added up its like 22/lbs
of torque and like 13 hp. and faster harder shifts.

[tristang]

Originally Posted by spike_africa

The jmod can be done for a few dollars in parts and then new fluid and filter. Its a must do for an auto car and you should add a tranny cooler to as heat kills auto trannys. Best $50 mod for an auto car is a tranny cooler.

i didnt see any of those around sounds like something to look into. ware can i find one.

[01FR500]

Tranny coolers can be found on Summit, Jegs, Ebay, alot of sites. There's not really a certain one for Mustangs, just universal. http://store.summitracing.com/partde...5&autoview=sku
Recommended.

[tristang]

cool thanks

[PColav6]

Originally Posted by Redrum

if i buy all-J-Mod Kits for the 4R70W ,99-04 3.8L Splitport Mustang Spacers and The Windstar Intake Kit (99-04 3.8 Mustangs) will i have more hp and torque? if i buy all three?

I don't believe the intake spacer for the split port upper will work with the Windstar upper.

[tristang]

oh yeah i didnt think of that

[01FR500]

You could proably make it work. Since the Windstar upper bolts to the Mustang lower, and the spacer goes between. You will proably need longer bolts, alignment pegs, etc.

[tristang]

so you guys with the j mod. how is it working for you. and what kind of change did u notice an ware did u notice it.

[crignaj]

Just another vote for the trans cooler. Easy to install & you can swap it out to another vehicle if you ever sell yours.

[spike_africa]

With the J mod it will shift firmer and faster then stock. It will most likely bark the tires on the 1-2 shift at WOT which is always fun. But it wont be so harsh that daily driving will suck.

[tristang]

k thanks guys im gona get it.
and im looking at tranny coolers too. thanks for the heads up.

[spike_africa]

Make sure you get a cooler that is a complete kit and has lines, fitting, and mounting hardware you dont want to be looking for that shit.

[tristang]

oh ok should i do the j mod and tranny cooler all at once or can i do one first and then the other.

[spike_africa]

If your going to be doing tranny work just do them both its easy to do a cooler, just mount it, unhook one line running out of the stock cooler from the radiator then connect it to the cooler hook the cooler line into the radiator and tighten claps, its that easy. The J-mod will take you if you have never done tranny work i would say around 3-4 hours taking your time looking at instructions etc.. over all both are easy and should be done to any auto car. Heat is the worst thing for an auto tranny minus neutral drops.