Hey all,
I beefed up the 4R70W I'm putting in my 63 Fairlane with a 4.6DOHC and one of the mods was called the J mod. It's where I had to drill some holes in the VB separator plate for better passage, along with different accumulator springs. It basically firmed and quickened the shifts and helped parts survive better.

Is there anything like this for the 4R75E in my 07 F150? I'd like the trans to shift into gear when I put it in gear and not have to wait a few seconds for it to engage.

Anything out there for these transmissions?

Thanks
Dave

 

http://www.bcatransmissions.com

 

That indicates the same performance VB for the 70 as it does the 75. It looks exactly as the one in my 70. The accumulator looks like the new version too. Hmmmm. Time to research. Thanks!

 

4R75 is essentially the same transmission. I do the Jmod and install Sonnax shift valves on pretty much every transmission I build.

 

Sweet. I just finished a 4R70W from a 94 that I'm putting in my 63 Fairlane. I did the Jmod and updated the accumulators pistons and springs. Can't wait to see how it does.

Thanks for the info.

Dave

 

I've been looking for this thread. Interested ... I've done J-mods on my '95 4R70W in my T-bird and one in my '01 Mercury Grand Marquis, there were changes in the holes, etc. Wondering if the '07 4R75E will use same holes as the '01 4R70W in that Mercury?

 

I tried changing the shift firmness on my F150 2002 4R70W with my superchips and didn't like the harsh shift so I thought I changed it back but it still shifted harshly. So, I thought the 1-2 accumulator shift spring had broken. When i checked the springs I found that the 2002 trans had double springs unlike the 95 MarkVIII Lincoln 4R70W that I previously changed the springs to the Jmod springs. On my 2002, I realized that I had not correctly changed the settings back to stock with the supechips. Bottom line is that these two trannys had different springs and who knows what else is different.

 

Oh yeah, they changed often I think in earlier years. I have a '95 T-bird 4.6 LX with J-mod too, updated to later pistons, used a purple lower 1-2 spring, it still drives great but it can be dangerous if WO when it goes from 1 to 2 on a wet road. Normal driving, it's great. I put the purple spring in because the stock one was in 3 pieces, so it already shifted hard all the time 1-2.
The '01 Mercury is heavier, has a taller 2.73 rear too so I only have done a WO 1-2 upshift once or twice since J-mod just to judge it, firm but not harsh, I left the lower spring out of it which means the 1-2 piston just sits still.

I'm not looking for harsh, just like a medium-firm nudge. I have a SC programmer in it & it shifts OK, I'm thinking I'll do some V-B mods, but put the springs back in along with a 2-3 accumulator area reinforcement plate from Sonnax (#76507F-01K) (It was about 2001 that Ford left a support plate out under there, the kit corrects that. The Mercury showed signs where the 2-3 piston hit) and I have a new OD C-clip. Also gonna add a drain plug in the pan. Recently I ordered a Tuff plate too, it's just a little thicker than OEM and since I have the Sonnax reinforcement "in hand", I'm thinking I might just use both in the '07 (but not use the "snubber" cup that I'm lead to believe goes with the TUFF plate if I use the Sonnax plate too) but before I decide I want to measure or compare holes closely.


I mainly just don't want to "over do" it.

 

The 95 Mark VIII had a soft shift, I suspect softer than other cars because it was a Lincoln. I just changed the springs in the 1-2 accumulator based on J's advice (He used to participate in the MarkVIII forums) and it quickened the shift enough to suit me. It wouldn't chirp the tires on a full throttle shift but it came close. I loved that car. If Ford came out with another one that looked exactly the same with the Mustang 5.0 engine and a 10 speed transmission, I would have to buy one.