The 722.6 is used in the chryslers. Same transmission is still used in the twin turbo v12 cars for it's power handling capabilities. I run them in my cars.
These can be built to handle in excess of 800hp. Stock transmissions can handle up to 500hp and up to 700hp in the v12s.
Many different variants depending on what the application was but almost all of them can be built up pretty strong.

Any chance this tranny will bolt up to a om603 diesel? It seems to have the same circular bell housing as the 104.

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87 w124 om603

Yea they are interchangeable

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

http://img78.imageshack.us/img78/1051/log7smallay9.jpghttp://img66.imageshack.us/img66/740...s3smallox0.jpg

Sweet. Now is the 716.620 the best 6 speed option? I know there are a couple others. If it is what specific model/year can i find it in? 03 c230?

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87 w124 om603

Only the M111 powered cars with 6 speeds will work. I'm not sure if there's a difference in the kompressor and non kompressor transmissions. If your going to do a lot of modding on the engine then I would jump on a 16v 5 speed as they can handle some good power. The 6-speeds are not much stronger past the stock power.

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1997 Mercedes E320 Turbo
Garrett T3/60-1 Turbocharger
Custom Water Intercooler Setup
352rwhp/366rwtq @ 8.6psi in '08

http://img78.imageshack.us/img78/1051/log7smallay9.jpghttp://img66.imageshack.us/img66/740...s3smallox0.jpg

The best is going in the other transmission adapting thread here, and having a bellhousing made, use an S15 Silvia or RX8, maybe an S2000 transmission, in my opinion...

RX8's and S2k's use trannies that are based roughly on the Mazda Miata transmission. Unless you've got an itty bitty high revving motor in a lightweight chassis, it'll eat those transmissions in a heart beat. The S15 6speed isn't strong AT ALL, and they often go back to the 71C 5 speed in the S13 chassis car.

The best boxes to get for strength are the Trans in the Skyline GTS-T or Z32. The R154 is close to that, and if you've got the cash to spare, a T56 is strong too.

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1993 190E 2.6 Sportline

I like the idea of a mercedes transmission in a mercedes. Ill be looking at maybe 380 ft lbs in the long run. It there any to beef the 6 speed up? And how would you go about dealing with the electronics?

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87 w124 om603

Im beginning to think the 716.620 in europe only. Some of the slks are m111 but with 5 speeds.

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87 w124 om603

The S2K has seen 700+ hp and the RX8 415~ whp. The 124 is only a couple hundred more lbs than the RX8.

It isn't a "Mercedes" transmission to start with. It's Getrag. You could get a custom flywheel and cryo treat the gears for longevity.

On a dyno or on the street and how long did those boxes last? I've seen well driven RX8's go at much less than that. You never did quote the torque numbers on either either. I could care less about horsepower. 700hp at 10 grand is only 350ftlbs of torque. That's right at the outerlimit of a MB 6 speed as it stands. I do know that high horsepower RX8 guys commonly go to the much stronger RX7 box. I'm not sure the torque numbers on the Honda box, but it's light, and Honda's don't exactly produce torque. If you happen to know any of the M104's that are high revving, low torque, high strung little things, you let me know.

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1993 190E 2.6 Sportline

The early 104 actually is? 196 lb/ft peak at around 4600 isn't exactly torque-y for an I6, 3.0L. Even the M3s have a longer stroke. It's not like the MB engines were built for torque from the onset.

The RX8 had 304lb/ft at the wheels peak. The S2K probably is around 350-360 at the wheels. Still quite a lot actually??? That's more than a 2002 Camaro SS!

Those transmissions are fine, is all I'm saying. Especially for a street car with driveshaft donuts, a dual-mass flywheel, and sprung clutch. Drifters, jackasses, and professionals will break anything with enough effort. If you want decent gear ratios, you can spend $3'500 for a V160, or get one of those. I think the newer 'Z' cars don't have a removable bellhousing, or that would be another option. Obviously, the BMW 6-speed is another good option, but potentially expensive. Seeing how people get with money when it comes to tuning, the $500-600 for the cheap 6 speeds is already too rich.

The point I'm making is that those numbers are still within the range (on the outside, but still there) of the Merc 6 speed. So all that work to adapt would be pointless?

You're correct the Nissan box is not a removable bellhousing, but you're going to have to make an adapter plate anyway, either from a removable M104 auto housing or to the block itself.

The V160 imo is way over-priced. For that price you can get a Viper T56 with a bunch of work done to it or either nissan or toyota box in whatever ratio and gear engagement setup you wish. However I'm suggesting those boxes, because I plan on exceeding the amount of torque and power that the MB 6speed, a dual mass fly, or any of the lil' roadster boxes.

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1993 190E 2.6 Sportline

The point is the MB trans shifter mechanism is garbage, and there isn't really anything that can be done about it. It's got luke-warm gear ratios. It was made for low end luxury cars. Why limit yourself to one box, that's rare as all hell, and sucks to begin with, and itself is overpriced? Odds are the driveshaft and shifter need modifying anyway, so that makes the ridiculous setup of those boxes more trouble than they're worth. The whole point of an inline transmission is to avoid rods and cables!

Lots of 6-speeds are out there. Most likely, just picking up that T56 is going to come with Mustang, Camaro, or maybe Viper gears, 2 of which are basically useless except for holding at low RPMs on the freeway. Even the Tremec website shows all configurations have direct 4th.