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Old 10-21-2008, 11:51 PM
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Join Date: May 2003
Location: Boonville Indiana
Posts: 2,342
Help 1980-300SD Transmission

I have a 116 300SD that would start but would not move... shifted all gears and nothing worked... Pulled the transmission and found the ears on the torque convertor were sheared off... This convertor had the narrow ears... Can the front of the transmission be removed and replaced with the later model that allows the use of a torque convertor with the wide ears??? Can this be upgraded??? Any help will be appreciated... I would like to reinstall this transmission in the car... Jim
James A. Harris
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Old 10-22-2008, 12:56 AM
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Join Date: Jun 2007
Location: new braunfels, TX
Posts: 290
What is the model number of the transmission? What caused yhe ears to shear off? Was it just from years of use or did the front pump or something behind it lock up?
1983 300D Daily Driver

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Old 10-22-2008, 08:31 AM
Admiral-Third World Fleet
Join Date: Feb 2002
Location: Central FL
Posts: 3,068
This is the 722.120 transmission. Same thing happened on my W116 300SD and I have seen several reports of this on the forum.

I doubt that the newer TC could be used without major modifications. The front pumps are totally different- the 722.1xx pump bolts in from the back and the 722.3xx pump bolts in from the front.

Bad design- but at least it lasted 30 years....

80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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Old 10-22-2008, 11:04 AM
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Join Date: Jan 2002
Posts: 18,355
Would a complete later model transmission with the larger ears bolt in to a W116 300SD? Trying to calculate my options, should mine follow suite.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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Old 10-22-2008, 11:22 AM
bgkast's Avatar
Rollin' on 16s
Join Date: Dec 2005
Location: Vancouver WA
Posts: 6,528
Originally Posted by kerry View Post
Would a complete later model transmission with the larger ears bolt in to a W116 300SD? Trying to calculate my options, should mine follow suite.
Yes, it will bolt up, however you may have to slightly tweak the vacuum and cable controls to the transmission, I'm not sure how the earlier one is set up.
1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine
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Old 10-22-2008, 12:26 PM
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Join Date: Apr 2007
Location: Redlands, CA
Posts: 1,577
I've got a good used working 722.120 from a 1980 300SD sitting in my garage. I pulled it about 2 months ago. I drove the car before I pulled it (the floor was rusted through in several spots) and the transmission was really smooth.

If anyone is intersted PM me.

Now back to the original topic. I was planning on putting this tranny into my 84 SD. I never physically tried because I came to realize that I would have no speedometer since the 120 was mechanical and my 303 was electrical. I purchased another one and installed it. It appeared to me that there should be no problems in getting it to bolt up. But getting a speed signal was a whole nother issue.
2004 E320 Wagon

Past Mercedes
1979 300TD
1982 300TD
2000 E320 4Matic Wagon
1998 E430
1984 300SD
1980 300SD
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