Can someone help me determine the size of the big nut holding the 3-pronged flange on the rear of a 717.411 5-speed transmission? I need to buy a deep-well socket to fit this nut. It looks like it's about 1-1/8" 12-point, but I cant determine the exact size, because I can't get a wrench on the nut right now.

I realize that it's actually a metric size, but I have had good luck with SAE wrenches on metric nuts when they get into the 1" and above size range. Plus, SAE deep well sockets are much easier to find locally.

Thanks for any guidance.

SteveM.

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'93 190E/D 2.5 Turbodiesel 5-speed (daily driver)
'87 190D 2.5 Turbo rustbucket - parts car
'84 Dodge Rampage diesel - Land Speed Record Holder
'13 Ram 2500 Diesel
'05 Toyota 4Runner

"I realize that it's actually a metric size, but I have had good luck with SAE wrenches on metric nuts when they get into the 1" and above size range. Plus, SAE deep well sockets are much easier to find locally."

These ARE metric trannies and using SAE on any metric nut (or the other way around) is just asking for a stripped head.

Anyway, the nut on a 722 4-speed is a 30mm 12-point. I could not find one anywhere so I brokedown a bought a Hazet 900TZ 30mm off the internet.

The 30 mm is 1.181"
1 3/16" is 1.187"

The nut is not going to care that there is an additional .003 clearance between itself and the socket.

If you are able to find a six point, there is even more safety margin.

are you sure??

the last trans rear seal I did (on a 420SEL), I used a 27mm deep socket...




edit: oh duh, I just reread and saw its not an automatic, forgive me my brainfart

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1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350