JMod: Yay or Nay? Gimme Some Opinions

sneaky98gt · May 8, 2010

So would a cooler like this one: http://mustangsunlimited.com/itemdy01.asp?T1=M7095SR+01&Category=&catkey=74-01# be what I'm looking for? I kinda like it because of the fact it's FRPP. Where do you mount it?

And I haven't checked the oil real closely before, but last time I checked (month or two ago), it was still reddish in color. I'll check again in a while when it's cooled down some.

StangSims39 · May 8, 2010

no the new 05-present had a 5-speed auto, the V6 Mustang from 99-04 have the 4R70W the GT and Mach 1 came with the 4R75W

KBExperience · May 8, 2010

04 is the only one that had the 4r75w

ran260gt · May 9, 2010

KBExperience said:
04 is the only one that had the 4r75w

KBExperience · May 9, 2010

But what is the difference between the two? : shrug:

sneaky98gt · May 9, 2010

KBExperience said:
But what is the difference between the two? : shrug:

I think the 75s are rated to hold more torque. Not positive, tho.

So, FRPP cooler, B&M cooler, or Advance Auto cooler?

And, remove accumulator springs or no?

ran260gt said:

You J-Modded your trans; did you remove the springs? And if you added a tranny cooler, which one did you use?

I know there are more folks here who have done the JMod...

TrueBlueGT1258 · May 10, 2010

I just bought a Ford Racing trans cooler from Summit that came with all the hardware. Was $94 shipped to my door.

san~man · May 10, 2010

sneaky98gt said:
So, FRPP cooler, B&M cooler, or Advance Auto cooler?

And, remove accumulator springs or no?

I ran the B&M 28000 (IIRC) GVW cooler and removed both springs (or w/e was the "max" setting). Ran like a champ.

ran260gt · May 10, 2010

KBExperience said:
But what is the difference between the two? : shrug:

Built alittle stronger, will not work in a 99-03 without some fancy tuning, added speed sensor and not sure about other 4R70Ws but the 4R75W T/C does not have a drain plug !

ran260gt · May 10, 2010

sneaky98gt said:
I think the 75s are rated to hold more torque. Not positive, tho.

So, FRPP cooler, B&M cooler, or Advance Auto cooler?

And, remove accumulator springs or no?

You J-Modded your trans; did you remove the springs? And if you added a tranny cooler, which one did you use?

I know there are more folks here who have done the JMod...

I removed the springs and I cant remember what rating I have but its a B&M think 24000 !

If you have a 98 4R70W in your car you have alot more work to do with the J-mod then the 99+4R70W, If you plan on doing it just study alot and take your time and you will be fine !

sneaky98gt · May 11, 2010

Yea, I'm still doing my reading and studying up on it. I haven't actually decided yet if I want to do it. I really don't want a harsh ride. If I didn't mind taking it back apart and putting new fluid in again, I'd go in and maybe do one thing at a time (drill the holes first, drive it, then decide if I want the springs out, or possibly the reverse order). I guess I could keep the (new) tranny fluid clean and reuse it. Heck, I don't know.

I think I'm gonna get the FRPP cooler. I've heard good things about it on other forums, and as I said earlier, I like the fact that it's FRPP.

And Laser, I checked the fluid. It is pink in color and doesn't appear to have anything at all in it. I let it dry on a paper towel and all that is left is a pinkish/reddish stain. So I think I'll be fine to put new fluid in.

Moon · May 12, 2010

What's wrong with just getting a shift kit? Some I've seen on 50resto are around $75

sneaky98gt · May 12, 2010

Moon said:
What's wrong with just getting a shift kit? Some I've seen on 50resto are around $75

The J-Mod is free. And was specified by the guy (Jerry) who designed the 4R70W transmission. He says that the J-Mod is the best "shift kit" for our transmissions, and that other "shift kits" are not good for the transmission, and well, I'm gonna take his word on it. Along with the other thousands of folks who have done the J-Mod and are satisfied with it.

StangSims39 · May 12, 2010

sneaky98gt said:
The J-Mod is free. And was specified by the guy (Jerry) who designed the 4R70W transmission. He says that the J-Mod is the best "shift kit" for our transmissions, and that other "shift kits" are not good for the transmission, and well, I'm gonna take his word on it. Along with the other thousands of folks who have done the J-Mod and are satisfied with it.

Not only that but when i blew my first trans in my tbird teh shop put a stage 2 transgo kit in, and it sucked, at times on WOT it wouldnt shift into 2nd it would go into Neutral, cause of a fail safe pressue valve the transgo comes with, needless to say i lost a lot of races until i just upgraded and got a street/strip vavle body cause i was too chicken to do the j-mod myself haha.

sneaky98gt · Jun 16, 2010

I hate to bring this back up, but I'm to the point of having time to do this, and I still haven't made up my mind.

What is the difference in the 98 4r70w and the 99+ (specifically an 01) 4r70w? I drove my granddad's 01 the other day, and forgot just how much I loved how it shifts. Smooth as butter at part throttle, but easily chirps the 1-2 shift (the car is stock). If mine would do exactly that, I'd be way beyond satisfied. What is the difference(s) in our transmissions?

Will the J-mod make it shift similarly to his? Or is it going to make it firmer than his?

Mr. Rustypwnz · Jun 17, 2010

sneaky98gt said:
Yea, I'm still doing my reading and studying up on it. I haven't actually decided yet if I want to do it. I really don't want a harsh ride. If I didn't mind taking it back apart and putting new fluid in again, I'd go in and maybe do one thing at a time (drill the holes first, drive it, then decide if I want the springs out, or possibly the reverse order). I guess I could keep the (new) tranny fluid clean and reuse it. Heck, I don't know.

I think I'm gonna get the FRPP cooler. I've heard good things about it on other forums, and as I said earlier, I like the fact that it's FRPP.

And Laser, I checked the fluid. It is pink in color and doesn't appear to have anything at all in it. I let it dry on a paper towel and all that is left is a pinkish/reddish stain. So I think I'll be fine to put new fluid in.

no harsh ride at all!!

my buddy has an 02 with a j mod, shifts fast and smooth at normal driving, wot it will spin 2nd gear and chirp 3rd, it shifts damn fast as well!

i dont remember you having gears either do you? cause your trapping 85 in the 8th, im N/a and go 83mph, that would be good for at least 2-3 mph prolly..

sneaky98gt · Jun 17, 2010

Mr. Rustypwnz said:
no harsh ride at all!!

my buddy has an 02 with a j mod, shifts fast and smooth at normal driving, wot it will spin 2nd gear and chirp 3rd, it shifts damn fast as well!

i dont remember you having gears either do you? cause your trapping 85 in the 8th, im N/a and go 83mph, that would be good for at least 2-3 mph prolly..

No, no gears. And yea, I'm expecting a couple of mph and tenths. I recorded .4 seconds 0-60 difference when I was NA just by upping the shift pressures and changing the shift points around. So I'm hoping I'll see similar results here.

Can anyone tell me the differences in the aero and new edge 4R70Ws?

DBMSTNG · Jun 18, 2010

With a propee tune, a jmoded car will shift nice at low throttle and hard as hell at WOT. It's worth the time and effort. Really no reason not to do it.

crazystang25 · Jun 18, 2010

And as said its better for your transmission.

JMod: Yay or Nay? Gimme Some Opinions

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ran260gt

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