gixxerboy

Eurocharged said they can do it for $499 and get back to me next day!!!

kb24forlife24

They can do the 3.06 gears for $499? That's pretty awesome! How come not more people have done this and how does it affect acceleration?

gixxerboy

no you misunderstood, the transmission control module has to be programmed for the gear change so it doesn't mess up the traction control and abs system. That doesn't actually change the gear ratio. So the programing is $499. But i bought a whole rear differential with the different ratio for $350 shipped. so it will cost me a total of $850 to do it.

it will make a huge difference for of the line acceleration

FLINTY55

Wonder the same as well...subscribed

Rudeney

Just an FYI - on the 722.9 transmission, the TCU is in the conductor plate, and it is a part of the anti-theft Drive Authorization System, which required SCN coding. Just be careful because if the tuner screws it up, you'll be paying the dealer $1400 for a new one.

gixxerboy

i am aware. I've purchased them before for customers before. UGh. Its eurocharged and kleemann that said they can do it.

You wouldnt trust either of them? Both said its an easy common thing they do

kb24forlife24

Oh I see. Can anyone tell me what my RPMs would be at 65/70/75 MPH going from 2.65 to 3.06 gears?

gixxerboy

there are online calculators where you can put in your current ratio and rpm at a specific mph and it will tell what it would be with different ratio's.
i would guess it probably going to put me up an at least 600 rpm than its currently at.

kb24forlife24

Rudeney would you recommend doing it on my car if I can find a good deal on a 55 differential for my 7-speed? I have almost 100K on the clock and did the 722.9 service at ~97K (2.5 months ago). I'd really like the increased acceleration but what else would be affected by this upgrade?

Rudeney

I would not recommend taking chances with these touchy transmissions just to get a few HP.

gixxerboy

this upgrade isnt a few horsepower, actually its none, but will make the car night and day,

Honestly i dont feel as these transmissions are that touchy, I do way more 722.6's than 722.9's at work, ive never had to replace a conductor plate in a 722.9, they are good transmission, better than the zf's in bmw's

kb24forlife24

I will wait until you try it out since you already ordered the differential to see if it's worth it or not. I might get a Eurocharged ECU tune for a good price that EC is giving me next week.

Rudeney

Really? My understanding is that almost every single 722.9 made before MY2008 will need a new conductor plate. And a large number will need a new valve body, and more than an anecdotal number of them will have a catastrophic failure of the main fluid pump.

kb24forlife24

What would be the symptoms of each of those 3 problems Rodney?

gixxerboy

i've only had to replace one ever. That was in an 09 c300 4matic. and it was the valve body itself that was the issue not the conductor plate. Benz wouldnt even sell it to us. I did the rest of the trans and towed it to dealer to have them install the valve body.
The case connectors leak allot, they are cheap part, but fluid will wick up the harness if its not taken care off. To me that is the major flaw. They do have some pump issues as you said.


Typically my parts cost on a 722.9 is less than most common Ford transmissions. a 5r55 that's in explorers and mustangs among others is far more expensive to build.

Rudeney

Typical symptoms of conductor plate failure are going into limp mode. Valve body problems will exhibit as clicking and clunking when shifting. The fluid pump will whine, and when it fails, you'll know it because you'll leave steaming trail of transmission fluid behind as you slow down with a dying transmission.

gixxerboy

just got my wavetrack lsd, probably later this month i will do the swap. I'm sending the tcm to kleemann to have it changed for the correct gear ratio.

kb24forlife24

Nice. Keep the thread updated. Pics?

gixxerboy

pics of the wavetrack?

i will do pics when i do the swap,

im switching shops i run, so waiting to i move so my car isnt apart at the other location

kb24forlife24

Any updates?

91ser

Subscribed! I just upgraded from a 03 CLK500 to an 08 CLK550. Although I love the newer 7 speed, its got too many gears for the rear end gear ratio. The lower 3 series gears would really help I would think!

If this works out for you, Id seriously consider doing it as well.

nkx1

I know this is sort of bringing this post back from the dead, but did anything ever become of this?

kb24forlife24

Don’t think so lol, OP has moved on with a CLS63

nkx1

Oh. Well there goes that haha.

E63007

I've got a 2007 AMG E63 that I'm trying to swap 3.06 Rear Diff Gears in. It was suggested to me by one on this thread that I should get the SRT8 Diff that comes with the 3.06, so I got one with 25k mi off eBay for about $300. It was also mentioned that I get the Siemens VDO VGS2/NAG2 TCU "Tune" done by "Tony" at RACeIQ, but when I called the local RACeIQ, the guys said he would call "Tony" but has not called me back. After explaining to him that the TCU is in the Transmission and sits on top of the Valve Body, he commented that he thought it could NOT be done with his equipment, but that I contact Renntech? So I did, and although they have a "TCU Tune" it doesn't account for anything other than OEM gearing!

I've also been told that it could be done with the China made K-Tag Kess programming devices, but all I've been able to glean is that may be able to copy from a working ECU, EPROM and other files to another ECU (as well as to clear codes like STAR/Xentry) , but there's no mention of it being to hook up to a TCU? After further review, it appears that in order to program, the chip itself must be directly visible (i.e.- by way of removing the cover of the EPROM) to which the nodes of the KTag Kess must be deliberately affixed to the EPROM of the TCU, impossible to do with the NAG2 as its cover is fused. This system may work with those TCU which reside outside the interior of the Transmission, unlike the NAG2 which is placed above the Valve Body inside the Transmission which may be programmed via OBD or even a direct connect by disconnecting the Electrical connection and attaching directly to the TCU that way?