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post #1 of 20 (permalink) Old 10-22-2010, 02:42 PM Thread Starter
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01-03 Mustang Tranny

I'm picking up an 01-03 Mustang 4r70w tomorrow that comes with the Torque converter. Will this bolt up to my '97 T-Birds flex plate? From what I understand is they are both 8 bolt and will bolt up.

Please let me know if this is for sure.

Thanks,

Al Thundy

Last edited by silversteed; 10-22-2010 at 03:31 PM.
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post #2 of 20 (permalink) Old 10-22-2010, 02:49 PM
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You won't be able to use the Bird's flex plate with the smaller converter. Use the one from the Mustang.

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post #3 of 20 (permalink) Old 10-22-2010, 03:30 PM Thread Starter
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Seems like all the salvage yards include the torque converter with the trans but not the flexplate.

Where can I get on cheaply?
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post #4 of 20 (permalink) Old 10-22-2010, 07:42 PM
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Quote:
Originally Posted by silversteed View Post
I'm picking up an 01-03 Mustang 4r70w tomorrow that comes with the Torque converter. Will this bolt up to my '97 T-Birds flex plate? From what I understand is they are both 8 bolt and will bolt up.

Please let me know if this is for sure.

Thanks,

Al Thundy
From what I understand, all 'Bird's are 6 BOLT flexplates, so NO, you won't be able to bolt up your 8 bolt Mustang one. 6 bolt flexplates are not THAT uncommon, however, and you should be able to find one easily. Mark VIII's and newer Mustangs (maybe 2005-) have 6 bolt flexplates that will accept the 11.25" torque converter you have with your transmission.

Where can you find one? I got mine off eBay, but you can go to a u-pull-it, but it's a big job since you're gonna have to pull the tranny. If you want, I'm gonna pull a tranny out of a Mark VIII at my local yard and I can get you the flexplate. I also know a friend who has a lot of them already pulled.

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post #5 of 20 (permalink) Old 10-22-2010, 10:09 PM
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01-03 GT's use 6 bolt flex plates, only the cobras, Mach's and 99/00 GT's used the 8 bolt

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post #6 of 20 (permalink) Old 10-27-2010, 01:07 PM Thread Starter
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01-03 GT's use 6 bolt flex plates, only the cobras, Mach's and 99/00 GT's used the 8 bolt
Got the new transmission and that appears to be the correct information.

Thanks for all the help...now on to the jmod
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post #7 of 20 (permalink) Old 12-08-2011, 01:40 AM
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Why are you doing a jmod on a 01'- 03' mustang GT tranny? Don't you only really have to do that to an older 4r70w with the bad valve body design and the mechanical Diode? From what i've looked at the 01' -03's don't really require it.
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post #8 of 20 (permalink) Old 12-08-2011, 02:02 AM
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A J-mod is a good idea on any 4r70w - it prolongs the life of the tranny and it also greatly improves shift performance.

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post #9 of 20 (permalink) Old 12-08-2011, 02:12 AM
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Quote:
Originally Posted by Mountain-Lion94 View Post
Why are you doing a jmod on a 01'- 03' mustang GT tranny? Don't you only really have to do that to an older 4r70w with the bad valve body design and the mechanical Diode? From what i've looked at the 01' -03's don't really require it.
Mechanical diode wasn't even offered until mid 97 and up. Also a jmod is a great modification to any 4r70w.

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post #10 of 20 (permalink) Old 12-08-2011, 10:40 AM
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With this 01-03 gt tranny, What other things are needed to put it in?

---Jeremy
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post #11 of 20 (permalink) Old 12-28-2011, 05:27 PM
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Well my trans. that I just bought blew out... I really think my car hates me.....but im going to buy a new 03 mustang trans. anything I NEED to do before putting it in? I already know that I have to re-wire the connector and to get the mustang flex plate.

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post #12 of 20 (permalink) Old 12-28-2011, 09:53 PM
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Quote:
Originally Posted by Mountain-Lion94 View Post
Well my trans. that I just bought blew out... I really think my car hates me.....but im going to buy a new 03 mustang trans. anything I NEED to do before putting it in? I already know that I have to re-wire the connector and to get the mustang flex plate.
WTF? What do you mean you "blew it up"? What happened? What is it doing? Yes, there are things you need to do if you put a later model year tranny in your '94 car. Do some searching on this forum and will find your answers.

You have to change the TCC solenoid to the one in your tranny and you might have to re-pin the plug - I'm not sure.

The torque converter if it's a 12" converter will bolt up, if it's an 11.25" converter, you need to swap the flex plate. It has nothing to do with 6 or 8 bolt, it has to do with the holes for the converter are simply not there on the flex plate if you swap an 11.25" converter where a 12" converter came stock. The 4 bolts that hold the converter on are in a smaller circle and in different places.

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post #13 of 20 (permalink) Old 12-29-2011, 02:14 PM
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WTF? What do you mean you "blew it up"? What happened? What is it doing? .
I think it was a POS 97... see below:

Quote:
Originally Posted by Mountain-Lion94 View Post
UPDATE- Installed and drove my car with the used trans. and so far its been great! Shifting points are very precise and firm. Lucky the 97 trans had the updated 1-2 piston and the roller clutch instead of the diode.
Quote:
Originally Posted by Mountain-Lion94 View Post
Why are you doing a jmod on a 01'- 03' mustang GT tranny? Don't you only really have to do that to an older 4r70w with the bad valve body design and the mechanical Diode? From what i've looked at the 01' -03's don't really require it.
CORRECT.

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post #14 of 20 (permalink) Old 12-29-2011, 02:28 PM
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LOL. Yup pretty much its was A POS. Will not go that route again.

94' XR7
  • '08 TR-3650
  • '97 COBRA 4V 4.6
  • 3.27 TRAC-LOK
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post #15 of 20 (permalink) Old 12-29-2011, 11:35 PM
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You have to repin your tranny harness and swap sensors and nss (neutral safety switch) from your old tranny to the 03 tranny. Also make sure you add your speed sensor and gear to the tail of the 03tranny

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post #16 of 20 (permalink) Old 01-02-2012, 04:01 PM
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Originally Posted by cobra R Thunderbird View Post
You have to repin your tranny harness and swap sensors and nss (neutral safety switch) from your old tranny to the 03 tranny. Also make sure you add your speed sensor and gear to the tail of the 03tranny
Thats it? Sweet. Also i had robertp make me a jmod for my 97 tranny, would the components from that go correctly into the 01-03 tranny also?

---Jeremy
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post #17 of 20 (permalink) Old 01-02-2012, 07:29 PM
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Thats it? Sweet. Also i had robertp make me a jmod for my 97 tranny, would the components from that go correctly into the 01-03 tranny also?
01-03 Main VB far superior to your modded 97 Main VB but IMO your 97 Main VB would be worth something to anyone running 2000 prior Stock Main VB.

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post #18 of 20 (permalink) Old 01-02-2012, 08:03 PM
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Originally Posted by N8tiveJuggalo17 View Post
Thats it? Sweet. Also i had robertp make me a jmod for my 97 tranny, would the components from that go correctly into the 01-03 tranny also?
Quote:
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01-03 Main VB far superior to your modded 97 Main VB but IMO your 97 Main VB would be worth something to anyone running 2000 prior Stock Main VB.

Buck is right; the newer valve body already has most of those mods done to the 97 valve body plate in Robert's kit. Per Jerry (the 4R70W god), there is very little things to be done to a late model valve body, I have it in my notes here somewhere.....

EDIT:
Quote:
Originally Posted by Jerry
For late model 1998- valve bodies, ignore what article says and do this...

1) Remove bottom 1-2 & 2-3 accumulator springs

2) Hole #2 is intermediate clutch feed (1-2 shift). Make this hole
.100"-.110" range (should be .081" in plate right now).

3) Hole #10 is reverse clutch feed & totally optional. If you want
to engage reverse faster, open this up to .093".

4) Holes #4 & #5 are direct clutch feed (2-3 shift). Open both
of these .100"-.110" as well. Make sure holes in the gasket
between plate & valve body casting is large enough (they
are sometimes a little small).

-Jerry

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post #19 of 20 (permalink) Old 01-02-2012, 10:24 PM
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Buck is right; the newer valve body already has most of those mods done to the 97 valve body plate in Robert's kit. Per Jerry (the 4R70W god), there is very little things to be done to a late model valve body, I have it in my notes here somewhere.....

EDIT:
Hmm, So if i bought the 01-03 tranny, The only thing really neccesary to do is to remove the springs for a firmer shift?

---Jeremy
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post #20 of 20 (permalink) Old 01-02-2012, 11:55 PM
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You have to figure out what setup you have on the speedometer and how to get where you need. Message me as the best setup is to send me a couple parts from your transmission, buy the transmission you want from strickerbros.com. I will go pick it up. Do some mods to it and install the required parts from your original transmission. repin your harness, install and drive it. It doesn't take me long to swap internal parts in one and costs about the same as a speed cal. It will take you longer to install the speed cal and figure it ut than to have me fix the transmission up a bit and I can do some easy upgrades while in these such as the spiral retainer and a better overdrive band, sonnax pressure regulator valve and servo pin. Not to mention mod the valvebody and accumulators.
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