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post #1 of 12 (permalink) Old 01-18-2014, 09:15 AM Thread Starter
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just finished jmod

i just finished doing the jmod on my 95 thunderbird last night. its a night and day difference from stock. At wot the shift from 1 to 2 will break the tires loose even with the stock 3.08 rear. next up is my 4.11 traction lock unit with cobra clutches
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post #2 of 12 (permalink) Old 01-18-2014, 10:35 AM
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Good job! It does make a big difference. Did you go with the 96+ tranny pan?

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post #3 of 12 (permalink) Old 01-18-2014, 01:23 PM
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Hard to believe how we ever got along without the Jmod, right?
It spoils you; from now on you will never own another 4r70w vehicle that isn't Jmodded!

Make sure you get the research done before swapping to that gear ratio...there's a few other important things to take care of besides just putting those gears in:
Upgrade driveshaft, tune, Speedcal, tailshaft Lube Mod, etc.

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post #4 of 12 (permalink) Old 01-18-2014, 01:55 PM Thread Starter
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i keep hearing about the tailshaft lube mod. what exactly is that? and i still need a tune with the j mod for the gears?
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post #5 of 12 (permalink) Old 01-18-2014, 03:09 PM
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http://www.forums.tccoa.com/showthread.php?t=106348
Chapter 12 has the Lube Mod info.

In this case the tune is needed to at least put the shift points back where they belong. Without it, the pcm thinks your speed is much higher than it is due to the increased driveline speed and will command the upshifts accordingly....which will be way too soon.

I went from 3.08 to only 3.55 untuned and am not happy with the shortshifting caused by not correcting with a tune. Eventually I will be changing gear ratios again but will also tune for it as well.

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post #6 of 12 (permalink) Old 01-18-2014, 03:49 PM
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Yeah, I have one 4R7nX transmission in the family that I haven't JModed (my 2000 Grand Marquis with 245,000 miles) because it is what it is...the family mover, long vacation, 2.73 single exhaust, nPI car.

But my 97 Cougar and 97 Mark VIII it was close to the first thing I did. Cougar is/was perfect with additional changes with a tune. Mark VIII is as nearly perfect as can be with just the mechanical changes. The Mark VIII transmission was also seriously misbehaving, I think most people would have written it off and replaced it. I might add the lower spring to 1-2, I left out all springs. On the Mark VIII I also replaced a number of parts in the VB, including the boost valve and pressure regulator. Mine didn't look as bad as some I have seen, but it was obvious they were wearing unevenly and possibly leaking.

What specs did you drill to, what configuration did you go with for accumulator springs?

Did you replace the aluminum pistons with the bonded steel ones?

I agree with above, the 96+ pan and filter are a great upgrade. I always had problems with fluid starvation going over intersections and around corners in earlier cars.

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post #7 of 12 (permalink) Old 01-18-2014, 05:18 PM Thread Starter
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replaced 1-2 and 2-3 accumulator pistons with the updated ones. only had lower springs in when i took them out but i didnt put any back in. i drilled to the 300-400+ specs for 95 model. didnt have a 96+ pan when i did it but may still go back and change at next service.
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post #8 of 12 (permalink) Old 01-18-2014, 05:35 PM
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You like the jmod? you will like those 4.10s twice as much.

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See profile for full list of mods

Pics here.. http://forums.tccoa.com/showthread.php?t=129479
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post #9 of 12 (permalink) Old 01-19-2014, 06:59 PM Thread Starter
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yea i like it better than what it was. the 4.10s may not be going in because i may be getting an 98 cobra and my wife will be getting my bird to drive.
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post #10 of 12 (permalink) Old 01-20-2014, 11:33 AM
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yep, its like night and day. what i really noticed on mine though was the 97 valve body was a whole lot better; the whole trans really, especially the mk8 convertor.

its just a better option to junk the whole 95 trans, but if shes gonna be the wifes carpark warrior i suppose its fine the way it is

i know i'd never go back!

RUST!! eating away at me more than the rear fender wells
95 Deep Jewel Green 40th Anniversary Bird / Stock SOHC 190k 96-97 intake swap, 97 Mk8 4R70W, Jmod, 3L27 / energy susp rear spindle, and cobra arm bushings, 93 Mk8 shaft, and LCAs, 225/60r16 on Windstar twin 5spokes, Vogtland 1.6drop springs, Tokico Blues, PBR, and rear-disk swap, 89 SC swaybars
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post #11 of 12 (permalink) Old 01-20-2014, 02:46 PM
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Quote:
Originally Posted by 94 Thunderbird XX View Post
http://www.forums.tccoa.com/showthread.php?t=106348
Chapter 12 has the Lube Mod info.

In this case the tune is needed to at least put the shift points back where they belong. Without it, the pcm thinks your speed is much higher than it is due to the increased driveline speed and will command the upshifts accordingly....which will be way too soon.

I went from 3.08 to only 3.55 untuned and am not happy with the shortshifting caused by not correcting with a tune. Eventually I will be changing gear ratios again but will also tune for it as well.
So if a Jmod is performed on a vehicle without a gear change the tune should be fine ?
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post #12 of 12 (permalink) Old 01-20-2014, 05:29 PM
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Quote:
Originally Posted by Lafayette View Post
So if a Jmod is performed on a vehicle without a gear change the tune should be fine ?
You won't have to tune it, but a good tune there would certainly help compliment the Jmod.

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