J-Modding an 99+ GT 4R70W - TCCoA Forums
 
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post #1 of 13 (permalink) Old 07-31-2004, 07:28 AM Thread Starter
 
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J-Modding an 99+ GT 4R70W

I just have a few questions on what is different between J-Modding the 96-97, to the 99+ GT 4R70W?

Are all the same hole openings the same specs?

Does anyone have the specs for the 300 - 450hp setting(I found them but there are different ones for 94/95/96/97, which do I use?)

Accumilators the same? Change out same ones?

Any other advise concerning J-Modded 99+

Thanks In Advance

Dave

Last edited by DMcBrideBoston; 07-31-2004 at 07:51 AM.
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post #2 of 13 (permalink) Old 07-31-2004, 09:23 AM
 
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You don't have to change the accumulator pistons since it will already have the new ones. You can, however, remove the bottom 1-2 spring and 2-3 springs to firm up the shifts.

I just did my Mark VIII to the 300-450hp range. Here's the holes I did:

Hole #1: .160"
Hole #2: .100"
Hole #3: .180"
Hole #4: .100"
Hole #5: .100"
Hole #6: .125" (you want to enlarge this one to the slot in the gasket)
Hole #7: .125"
Hole #9: .089"
Hole #11: .089"



Here's Jerry's info on modifying the main control:

Page 13 and Page 14
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post #3 of 13 (permalink) Old 07-31-2004, 09:47 AM Thread Starter
 
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Thanks

Dave
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post #4 of 13 (permalink) Old 07-31-2004, 09:56 PM
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dave see if the place that is installing your new trans will let you have your old valve body. you can probably sell the jmod'd separator plate on here

frank

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post #5 of 13 (permalink) Old 07-31-2004, 10:09 PM Thread Starter
 
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Planned on it, Jim out in Ayer is doing the swap.

Thanks Frank

Dave
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post #6 of 13 (permalink) Old 09-04-2004, 07:50 AM Thread Starter
 
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Do I need to swap in the updated blue 1-2 spring or is it already in there?

Thanks Alot

Dave
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post #7 of 13 (permalink) Old 09-04-2004, 10:28 AM
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should already be in there. all u gotta do is drill the plate and pull the 1-2 bottom spring and the 2-3 spring.

Frank

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2003 Suzuki GSX-R750
2003 Mustang Cobra 10th Anniversary - 11.2 @ 130
1997 Thunderbird LX 4.6 - 13.7 @ 103
1993 Thunderbird LX 3.8 - Slow
1990 Thunderbird 3.8 - Slower
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post #8 of 13 (permalink) Old 09-04-2004, 12:07 PM Thread Starter
 
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Thx...
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post #9 of 13 (permalink) Old 09-04-2004, 05:40 PM
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Do not count on a certain accumulator spring to be there, they vary from model to model.
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post #10 of 13 (permalink) Old 09-04-2004, 09:21 PM
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Quote:
Originally posted by kdanner
Do not count on a certain accumulator spring to be there, they vary from model to model.
Good post. My 01 GM trans has a green upper 1-2 spring in it. Grabbing the blue one from my old 95 as it comes out.

These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.
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post #11 of 13 (permalink) Old 09-04-2004, 09:32 PM Thread Starter
 
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Does this go for the accumulator pistons also, or just the spring?

Thanks

Dave
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post #12 of 13 (permalink) Old 09-04-2004, 09:35 PM
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To the best of my knowledge, you should have the updated pistons in there already. Just pull/swap the springs, and you should be set.

These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.
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post #13 of 13 (permalink) Old 09-05-2004, 07:35 AM Thread Starter
 
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Thanks Alot guys,.....better to be safe than sorry.

Dave
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