Jakpro1

**edit, sorry...am talking about the twin turb ML63 Klee is putting out.

Read this a few times and I am really curious. Klee claims NO mods to the tranny were needed.

Is it because it's a 4Matic setup or something?

I heard many times the 7G can't handle much more than the current 6.3 is putting out. This is a HUGE increase from that.



From one of the many articles

BiTurboAmg

Its because they are not doing it. It was kleemann dubai and from what I heard it was a one off car that was not tested to prove 0-60 etc. I am sure it is just a show car and that the boost is turned all the way down.

MB_Forever

So, they won't develop a kit for sale?

Jakpro1

Guess I was actually wondering if the lower stated torque limits of the 7G were part of the Mercedes campaign against modders. You state that the tranny can't handle much extra hp and guys stay away from massive mods.

Perhaps the tranny can take the same punishment as the old 5Speed?

Chappy

I think they would be putting the 7G in the flagship SL65, CL65 and S65 models if that were the case.

ItalianStallion

Is the 7Gtronic in the non-amg cars the same exact tranny as the 63's?

I say this because on my '05 CLK500, as soon as I started spraying nitrous and goin' rough the tranny has become a real POS. It slips and shifts ridiculously hard in some gears. There are times where its soft and smooth but then it just acts up and bucks or lets the RPMs climb in between gears. The tranny is definitely messed up and I think a main reason for this was because of the extra 75tq that was being blasted on it as well as the daily abuse. Even so, the 63's should have been making at least, if not more tq than my car...

Maybe I just got a bad example, or the 05's were no good? On the S550 the tranny is a real pleasure and I haven't seen anything close to what I have seen in my CLK. Oh well.

Chappy

Some light reading for you......

http://www.europeantransmissions.com....htm#CLK-Class

Jakpro1

Good point Chappy, but just wondering if the 7G can handle more than stated. Don't think it's anywhere near mountain of torque V12 limits, but perhaps more than stated originally.

***edit, Hey Chappy, here's an idea. Maybe the tranny was just developed for the V8's rev range etc, and not the 12. Ahhhh, that doesn't make sense. Guess it sounded a lot better in my head.

MB_Forever

I would think the 63 version of the 7G would be beefed-up a bit for the extra hp and tq. I know AMG states that it shifts 50% faster than the non-AMG version. Maybe some of the tuners can chime in on this

baldmike73

not sure what tranny is in your clk but when i had my 05 e500 the first year for th 7g tranny and i had the same issues you had and after 6K miles on the clock and a tranny that was shredded they had a recall for the TCU as the new tranny was using the older TCU which caused the transmission to suffer and in my case ultimately break.

if you can find a dealer that is friendly to NOS then have then order you a new TCU or flash your existing with new software.

ItalianStallion

That explains a lot then, thanks. I actually did have some software uploaded by MB and they said that this would cure it. But it's worse than ever now. Whatever, I'm not even going to mention it when I bring it back at the end of my lease lol. Thanks.

And according to that link provided by Chappy...seems like all 7gtronics are the same whereas the old 5 speed was different in the regular and AMG models. Interesting.

Chappy

Similar, but not exactly the same. I posted that link so you could compare some part numbers. You've got the 722.901 IIRC, which is different than some of the other 7G trannies listed.

CWW

Holy *****.

You put NOS etc. on lease car?

ROFL. I pity the guy that ends up with that thing when you're done with it.

ItalianStallion

Benz-O-Rama

My 2004 E500 has the 7G as well. I believe 2004 was the first year for it, not 2005.

NdnMbLova

You guys do know that AMG has developed a 7G tranny that can take the abuse of the twin turbo engines. They were discussing that this was in the works way back in 2006

Murtaza

If thats true why does the SL55/65 and CL65 use the 5-speed to this day?

MB_Forever

There could be other reasons: maybe not enough research and testing time to put it in such an expensive car, maybe they wanted to leave the 65 engine unmodified until its next makeover, etc.... I'm not saying those are the reasons, I'm just saying they could have had other reasons for doing that

Jakpro1

Maybe I could call Cory and see his take on it.

NdnMbLova

Well because the 5-speed can handle upwards of 700lb-ft of torque. To date it is one of the strongest tranny's made.

Also they said that a 7-g that could handle this load was in the works in 2006, that means they were testing it. It takes time to test these transmissions and hence i could see one being available around the 2009-2010 period.

jangy

Does anyone know if that upgrade includes replacing the TQ converter for triple discs? That will be the next big mod for the E55s, maybe it would help the E63s now?

It isn't just the max rating that the tranny is spec'd at, but also the conditions. It isn't going to snap while its cruising down the road.

E55 RUSS

This 800 HP ML63 actually uses 5 speed tranny...cause they couldnt get 7G to hold all this torgues

A freind of mine had a ride in this car and he said it faster then Gemballa 750 Cayenne...

kipper215

the 2005 CLK500 does have the 7g tranny in it. i just sold mine.