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#1
04-22-2009, 11:21 PM
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Whats the difference between a 1984 300td transmision and a 1985 300td transmission
I own a 1984 300td that has some transmission problems. I recently found a 1985 300td transmission that is in very good shape and being sold at a reasonable price. Does anyone know if the 85 tran will work with my 84 engine.
Thanks Dan 
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#2
04-23-2009, 12:03 AM
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Others have said I am wrong in thinking the following but I'm pretty sure I read it in a shop manual somewhere. The 85 TD has an electronic rack position sensor. This information is fed to the transmission to use in the control of shifts. I'm pretty sure the 84 lacks the rack position sensor.
Take this for what it's worth. My memory is not all that reliable. Others say the rack position sensor only factors into computer control of the EGR.
__________________
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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#3
04-23-2009, 12:08 AM
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there is a california variant for the 85s. Not sure if is a fit issue...
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#4
04-23-2009, 06:32 AM
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Not sure about what Kerry says ( I, for one never heard of it) , but the 85 transmission is a 722.4xx whereas the 84 is a 722.315. Make sure you get the torque converter with it. A lot of the vacuum controls are different as well, so get those too.
__________________
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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#5
04-23-2009, 08:29 AM
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I believe the '84 is a stronger unit than the '85.....
__________________
-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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#6
04-23-2009, 09:39 AM
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yep, the 84 is rated for higher power, but the 85 has a better TC.
__________________
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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