Late Model Ford 4R70W J-Mod notes

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Ford 4R70W Transmission upgrade (J-Mod) for late model (1998
       and newer) Crown Vic/Grand Marquis/Marauder
Installation notes by Bill Bowker (Marauderer)                 Presentation by Todd Stafne (HookedOnCV)

The following notes were compiled from forum posts by Bill Bowker while he was in the
process of modifying his 2003 Mercury Marauder's transmission. The J-Mod has been
performed by many people on the 4R70W transmission using the detailed articles found on, however no updates to the article have been published specifically for the late
model Panther platform cars. Over the past several years, Ford has made many of the
improvements called for in the TCCoA article and this presentation summarizes the suggested
changes for our current application.

Please refer to the detailed article posted on TCCoA's website to gain a full understanding of
what it is you are trying to accomplish with the J-Mod. You will get much more information
pertaining to the overall modification than what is presented here. Use this document only as
a supplement to TCCoA's transmission article.

I met with Jerry W. this Saturday in Detroit and asked him about his J-Mod for our cars. He
sent me this picture and these updated instructions for late model cars.

>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

 2004 CrownVic.Net                              Page 1 of 7                          22-March-2004
Ford 4R70W Transmission upgrade (J-Mod) for late model (1998
       and newer) Crown Vic/Grand Marquis/Marauder
Installation notes by Bill Bowker (Marauderer)                 Presentation by Todd Stafne (HookedOnCV)

                                                 Figure 1

 2004 CrownVic.Net                              Page 2 of 7                          22-March-2004
Ford 4R70W Transmission upgrade (J-Mod) for late model (1998
       and newer) Crown Vic/Grand Marquis/Marauder
Installation notes by Bill Bowker (Marauderer)                  Presentation by Todd Stafne (HookedOnCV)

 3/8 drive inch pound torque wrench
 3/8 to 1/4 drive adapter
 snap ring/retaining ring pliers
 Deep well 10mm socket (1/4" drive)
 Standard depth 8mm socket (1/4" drive)
 Cordless drill with clutch
 Drill Press (or drill) and drill bits (separator plate mod)
 Oil drain pan
 Exacto knife or razor blade
 (2) Separator Plate Gaskets
o 1W7Z-7D100-AB
o 1L3Z-7C155-AA
Note: about 2.00 each
 transmission fluid filter
 approximately 8 quarts of transmission fluid
 Dielectric Grease
 Carb or brake cleaner
 Sanding stone or knife sharpening stone
 Jack, Stands, Lights

Step I:

 Disconnect the transmission cooler return line where it changes from a hose to a steel line.
There are two lines coming out of the cooler, you want the upper one. Follow it down; it
should still be the upper line at the point of change.

Note: Look under the passenger side, it is in between the frame and the lower crank pulley. A
quick squeeze of the pliers to move the clamp and you're done.

 Have someone hold it steady and point it into an oil pan. Start the car and let it idle while
the transmission fluid is pumped out in a continuous stream. Shut the car off as soon as the
stream starts to sputter or the flow decreases significantly.

 Re-attach the transmission cooler line.

Note: This would be a great time to drain the torque converter if you like.

Step II:

Jack up the front of the car and place it on jack stands for safety.

Step III:

 Remove the transmission pan by loosening the 14, 10mm pan bolts.

o You're best bet is to use a cordless drill with a 1/4 " socket drive adapter and a deep well
10mm " drive socket (you use a " drive because anything larger will not fit between the
frame and the rear of the pan.

 Drop the pan

o There will be very little fluid left in the pan. You can let it down carefully without fear of
spillage. The messy part comes later.

o 4 - 5 items should fall into the pan; a little yellow plastic plunger (discard, it was a

 2004 CrownVic.Net                              Page 3 of 7                           22-March-2004
Ford 4R70W Transmission upgrade (J-Mod) for late model (1998
       and newer) Crown Vic/Grand Marquis/Marauder
Installation notes by Bill Bowker (Marauderer)                 Presentation by Todd Stafne (HookedOnCV)

temporary plug from the factory), the 2-3 accumulator spring (set aside it does not go back
in), a metal base for the spring (save), possibly the 2  3 shift accumulator itself (a larger
plunger with a smaller diameter top and larger diameter bottom, and oval shaped filter.

o Remove the filter; remember to pull out the rubber grommet as it usually sticks.

Step IV:

 Remove the valve body

o Prep: layout a canvas under your car, layout a couple of paper towels under the car to set
the valve body on later, layout a couple of paper towels on your workbench to receive the
valve body once it is removed.

 Start by removing the black plastic harness from the valve body. It snaps into place in 3-4
locations and is removed with a slight tug at each connection point.

 Towards the upper right, remove the bolt with the rooster comb spring (has a roller attached
to it ), makes sure to keep the bolt in the hole of the spring as to not lose the orientation of
either piece.

 Adjacent to this is another bolt with a metal bracket, remove this in a like manner.

 Now take a look at the valve body and notice that there are two types of bolts; those with
8mm heads and those with 10mm heads. Do not concern yourself with the 10mm bolts. Look
closely at the 8mm heads and you will notice that the ones in the middle section (plate
section) will be a bit longer than those on the periphery. When putting them back, the longer
ones go in the plated section and the shorter ones go around the periphery.

 Remove the periphery bolts (using a cordless drill, an a 8mm socket)

 Note the position of the manual valve. It is the piston looking thing and has a notch in it in
which a pin on the detent lever resides.

 Remove the bolts in the plated section, all but one in the center most section.

o Now get your drain pan ready as here comes the tranny fluid shower

 Slowly back out the last bolt about a quarter of an inch and wiggle the valve body slightly so
that tranny fluid starts flowing.

o Let this drain for 15  20 minutes (should be about 3-4 quarts).

 Once the fluid has drained, or you get tired of waiting, hold up the valve body and unscrew
that last bolt. Hold it firmly and be prepared as it is heavy than it looks and if your car is not
jacked up high enough you will have little leverage.

 Place the valve body on your workbench, gasket side up.

Step V:

 Disassembly and Modification.

 Use an exacto knife or razorblade to lift a corner of the gasket and remove carefully.

 Note the orientation of the two reinforcement plates (circles with 4 bolts each)

 Remove the 4 bolts from each plate with a 10mm socket and place on a paper towel in the

 2004 CrownVic.Net                              Page 4 of 7                          22-March-2004
Ford 4R70W Transmission upgrade (J-Mod) for late model (1998
       and newer) Crown Vic/Grand Marquis/Marauder
Installation notes by Bill Bowker (Marauderer)                 Presentation by Todd Stafne (HookedOnCV)

same pattern as they were prior to removal.

 Remove the one 10mm bolt that holds the separator plate in place.

 Remove the two plates and place them in the same orientation they were prior to removal
(clean with carb or brake cleaner).

 Remove the separator plate and clean with carb or brake cleaner.

 Drill the holes as prescribed in Jerry's document (Figure 1)
o I drilled mine to the following specs:
o Holes #2, #4, #5, #9, #11  7/64 drill bit
o Hole #10  3/32 drill bit

 Deburr your drillings with a sanding stone

 Remove the remaining gaskets off the valve body

 Place the new gasket on the valve body

 Clean the separator plate and reinstall

 Install the new top gasket

 Reinstall the circular reinforcement plates (torque to 90 inch pounds)

 Clean the entire valve body paying attention to any electrical connectors

 Apply a small amount of dielectric grease to the electrical connectors.

 It is now ready for re-installation.

Step VI:

 Under the car; clean the transmission internals with carb or brake cleaner, paying attention
to any electrical connectors.

 Using the snap ring/retaining ring pliers remove the snap ring from the 1-2 shift accumulator
(the round hole on the drivers side front corner [towards the front of the car])

o Watch out as this ring holds a cover with a spring behind it that is under tension.

 Remove the spring.

 Replace the cover and the snap ring.

 Apply dielectric grease to any electrical connectors.

 Clean the oval filter screen that came out during disassembly and apply a small amount of
Vaseline on the black plastic (top) and place it back up in the tranny. There is only one place
for it to go towards the rear right corner. If you look up you will see a space the shape of the
black plastic top (a rectangular shape).

 The 2-3 shift accumulator may have fallen during the valve body removal. Place it and the
spring plate back into the 2-3 shift accumulator hole. The accumulator goes in small end top,
large end bottom. Press it into the hole slightly. Then install the old round spring base; one
side is relatively flat and the other has a point; the point goes down. You may have to bend
the tabs out on this piece ever so slightly to get it to stay up in the hole.

 2004 CrownVic.Net                              Page 5 of 7                          22-March-2004
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