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#1
08-29-2013, 08:09 PM
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trans just went kaput on my '82 300sd
Just lost first gear on my way into work. Slipping under any sort of throttle. Have to go very lightly to get it to move. All other gears ok. Oil is ok. driveline is ok. trans is kaput.
Mine is an '82 300sd w126 with om617. located a used transmision out of an early 80's w123 300d with an om617. Runs and drives well. Body rotten. Are there going to be any issues using this transmission? I searched the forums, too much info. Are there any good threads on transmission R+R? Bowden cable removal etc? anything to watch out for or any special tricks to know that will make my life easier?
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing. 
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#2
08-29-2013, 08:21 PM
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The 300D has a mechanical speedo. Make sure its from a 300D turbo (722.315) if you buy it.
__________________
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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#3
08-29-2013, 08:28 PM
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Quote:
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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#4
08-29-2013, 09:02 PM
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If it's free, get it. I'm actually doing this same (W123 --> W126) swap, so I'll let you know how I do... I'm hoping to be done on Monday. Swapping tailshafts is supposed to work.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco...  " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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#5
08-29-2013, 09:11 PM
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You may have issues, if that is a 1979 and not an 1980 model it may have the Bowden road only transmission.....which the 1979 linkage is way different then the 1982....so adapting the rod controlled transmission isn't easy...
If this is a 1980 model, it will have a vacuum controlled only transmission, no Bowden rod or cable... There may also be an issue with one being a turbo and the replacement a non turbo...
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#6
08-29-2013, 09:25 PM
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Quote:
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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#7
08-30-2013, 03:53 AM
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I think it has been reported that the problem with the tail cone swaps is that going from an electronic speedo to mechanical isn't possible because there's no lubrication system for the mechanical cogs - but going the other way is meant to be fine. This only works for the 722.3 transmissions though.
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#8
08-30-2013, 04:48 AM
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The car is a turbo, and believe it has cruise control. Does this mean it may have both mechanical and electrical speedo tail shaft? I am also certain of has aa bowden cable. Engine bay looks identical to mine, iirc.
__________________
1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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#9
08-30-2013, 08:47 AM
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Quote:
BTW, all turbos came with cruise control.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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#10
08-30-2013, 08:51 AM
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Quote:
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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#11
08-30-2013, 08:58 AM
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The trans from my '85 300SD had an electronic speedo, much to my surprise. It has new external seals. When we took the pan down it looked perfect - no shiny bits at all. BTW - a friend has that trans - it's available but I don't know how much he wants for it. If you're interested I'll get back to you on it.
Dan
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#12
08-30-2013, 10:09 AM
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Are you not interested in replacing the B-2 piston? That is what broke to make first gear not engage. It is much easier to replace than the whole transmission.
I actually replaced my trans at one point with a SD 722.3xx and didn't have a speedo because of the electronic vs. mechanical tail cone.
__________________
1982 300TDT 1991 190D 2022 Metris
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#13
08-30-2013, 10:15 AM
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I agree that the issue is likely B2 piston, I'd look into that first.
Swapping the tailpiece on the trans is doable but a pain. I did it for my SD, bought a transmission from a 1985 300D and swapped the tail. You need a tail piece gasket, rear shaft gasket, and a new yoke nut that you peen into position, you also need the special socket to remove and install the yoke.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#14
08-30-2013, 10:47 AM
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X3 on the B2. Why do people worry about speedometers in the age of GPS?
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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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#15
08-30-2013, 02:54 PM
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I'm on my mobile, forum search doesnt work well. any good links on the b2 piston? In a pinch, can I just swap it out of the 123 trans to see if it works?
__________________
1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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