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I've done at least 5 J-mods, but most of them have been on 95-97 4R's. What is different about the 2001 version that I need to know? I'm assuming the pistons and springs are already updated. Anything else I need to know?
 

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I've done at least 5 J-mods, but most of them have been on 95-97 4R's. What is different about the 2001 version that I need to know? I'm assuming the pistons and springs are already updated. Anything else I need to know?
Per Jerry W. regarding 1998- 4R70W's...

>Ignore what the article says and do this...
>
> Remove the bottom 1-2 accumulator spring and remove the bottom 2-3
> accumulator spring.
>
> For holes do this.
>
> Hole #2 is the intermediate clutch feed (1-2 shift). Make this hole in the
> .100"-.110" range. It should be .081" in your plate right now.
> Hole #10 is the reverse clutch feed. Totally optional. If you want it to
> engage into reverse faster when you move the lever, open this up to .093".
> Holes #4 & 5 are the direct clutch feed (2-3 shift). Open both of these
> holes up to .100"-.110".
> Holes #9 and 11 are the forward clutch feed (4-3/4-2 shift). Make both of
> these .100-.110" as well.
>
> So, it looks like you need a drill of around .100" and you should be good.
> When you open up holes 4&5 make sure the hole in the gasket between the
> separator plate and valve body casting, is large enough. These holes are a
> little small.
>
> jerry
 

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Holes 2, 4, 5, 9, & 11 use a 7/64 drill bit.
If you do hole #10(reverse) use 3/32 bit.

I should be doing the j-mod this weekend..I've read so much about it, I almost know it by memory now lol.
 

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Anyone done the above J-mod as outlined on a 2001 trans want to say if it's mild or wild or what ..... like how hard does this make it shift?

I have a '01 Mercury GM I'ld like to firm up next fluid change, but not make it harsh.

Has 2.73 (or 2.76, I forget the exact except it's geared high) rear gear.


Thanks ........
 

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From what I saw on 2001 VB using Jerry's Mild Specs you'll actually do VERY little on the 2001 Sep plate - Most of it is already done by Ford - I WOULD go thru the SONNAX Site thoroughly also for VB reccommendations - If you are going in there you might as well do it right - I agree with opinions that the LACK of the 3rd small round pac-man plate on the 2000+ VB leads to cross leaks in the VB ~!

http://www.sonnax.com/index.php
 

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I just did the j-mod on Friday and wow! For one, it was very easy and I had nobody to help me.

Since I have a 99 I did have that 3rd circle plate, but that really does not affect anything at all, you, you just remove the 2 bolts like you do with the other two plates.

When going 25mph down my street you can feel a huge difference from stock. When accelerating hard, the tires chirp on the 1-2 shift just about every time. Since this is the first kind of 'shift kit' I've ever done, I personally would say it's kind of mild but still very much worth doing.
 

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It's the LACK of the 3rd small pac man Plate on the newer VB's that this Thread Title is about that can cause problems - Sonnax has Kit to put the small plate back in place but you make your own of course.

- I'd say most guys with true Mild JMOD settings & sticky tires would only see the occasional chirp like you describe - My Mild Settings with a tweaked D/Dog TC shifts silky smooth like stock if you are putting around under 2K RPM... above that Shifts Firm up noticeably & at WOT it shifts quick & solid.
 

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Third 4R70W Plate

It's the LACK of the 3rd small pac man Plate on the newer VB's that this Thread Title is about that can cause problems - Sonnax has Kit to put the small plate back in place but you make your own of course.

- I'd say most guys with true Mild JMOD settings & sticky tires would only see the occasional chirp like you describe - My Mild Settings with a tweaked D/Dog TC shifts silky smooth like stock if you are putting around under 2K RPM... above that Shifts Firm up noticeably & at WOT it shifts quick & solid.
Are you talking about this plate that applies to 2001-up 4R70W's?
http://www.sonnax.com/part_summary.php?id=5245&pl=1
 

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ABSOLUTELY ~!! - Been there, done that & have pix to prove it.
 

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From what I saw on 2001 VB using Jerry's Mild Specs you'll actually do VERY little on the 2001 Sep plate - Most of it is already done by Ford - I WOULD go thru the SONNAX Site thoroughly also for VB reccommendations - If you are going in there you might as well do it right - I agree with opinions that the LACK of the 3rd small round pac-man plate on the 2000+ VB leads to cross leaks in the VB ~!

http://www.sonnax.com/index.php
Thanks .... I have one of Robert's kits for my '95 Bird and after that I will do the Merc per above. Just been too hot to get excited about these jobs .... :cool:
 

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i hear that... been around 115index here all week, but i finally got my bird back on the ground and im definatly feeling a diff with my F7 trans and Jmod with 1-2spring out. drove it for an hour though, havent really got to the WOT cuz im gonna drive like norm for a while, make sure everythings broke in real nice before i go and bust something :p

doubt ill get a chirp with my 245 60 15s though, think thats it, close to that, reall wide tread. might be a 65. i know i used the miata calculator and found the closest diameter and my speedo is just about spot on.
 

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Well, here it is 2012 and I'm trying to get that reinforcement plate kit for the valve body seperator plate and then the gaskets from Sonnax .... that kit 76507F-01K isn't listed in any of the distributor's sites that I can find.
 

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Well, here it is 2012 and I'm trying to get that reinforcement plate kit for the valve body seperator plate and then the gaskets from Sonnax .... that kit 76507F-01K isn't listed in any of the distributor's sites that I can find.
Call Sonnax: 800-843-2600 · 802-463-9722
Or email: [email protected]
 

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OH ... they will sell to me then? I'll call tomorrow .... Thanks.
No problem. If they won't sell to you directly, I'm POSITIVE they will tell you where to get that item! :D
 

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Small Plate

One of our illustrious Vendors could just sell you the Small Plate & Fasteners fm an old dead Pre-2001 VB they have lying around the shop...
 

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Talk about procrastination .... today I was getting the '01 Mercury (referenced above) ready to carry us to Ga. for Christmas / New Years as we just have too much to carry to drive one of the T-Birds or the Mustang.

So, there I am .... pulled the car cover off the clean Merc, checked her fluids, looking at last oil change, etc (all good natch' ) .... and due to recent postings about intakes I suddenly (and inexplicably) start worrying about driving the Merc out of state with her OEM plastic X-over intake now (this being the same car I took to Utah and Az. in 08 ... same car that we spent 7,945 miles in over 21 days in 2006 touring out west .... same car that's never shown the slightest hickup) ... and then I thought about this transmission deal and wishing I had already done this as well.

Funny how some "small worry" get's stuck in one's head at odd times, perhaps it's "an omen"? :D

So I came in and did some research and now have the "PacMan" plate kit and gaskets to do the above J-Mod on the '01 4R70W all on order from Transmission Parts USA .... should be here when I get home!

Anyway, weather being questionable, the fact that we've put a few thousand on the Merc already this year, it also was used over last weekend a few hundred miles .... I just left it parked in it's carport spot all clean and dry and unhooked the battery and put the covers back on.

Decided to drive the "07 FX4 instead, it get's about 20-20.5 on the road so instead of using 40 gallons down and back, I'll use 50-52 instead.

Then, when I get back, I'll tackle this J-mod and swap on that '03 aluminum X-over PI intake .... and later in Spring slip on some new RS-As and be ready to take her for a May trip. She only has 76.5K on her clock. ;)

Merry Christmas to you all!
 

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