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  #1  
Old 01-23-2018, 12:58 PM
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83 to 85 Differences

I ran across a 83 300D with a blown om617. The turbo and injection pump are removed but the rest is there. Thinking about getting it for a parts car for my 85. What all changed from 83 to 85? Are the transmissions the same?

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Old 01-23-2018, 01:43 PM
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Transmission for the 1985 year is different, but will bolt up. The torque converter and I believe flex plate are also different.

The 1985 has the 2.88 rear end as well which is unique to that year

If the 1985 is a California model then the turbo, exhaust and starter are different as well.
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1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust
1992 BMW 525i -traded in
1990 Silver 300TE -Sold Loved the wagon, hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #3  
Old 01-23-2018, 02:15 PM
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Quote:
Originally Posted by dude99 View Post
Transmission for the 1985 year is different, but will bolt up
I believe only the '85 California models got the 722.4xx transmissions. The '85 federal models still have the 722.3xx (see the chart below, from the link that follows).

1985 FEDERAL W/S/C123 (300D/TD/CD) = 722.315 transmission
1985 FEDERAL W126 (300SD) = 722.303 transmission
1985 CALIFORNIA W/S/C123 (300D/TD/CD) & W126 (300SD) = 722.416 transmission (300SD had a different tailcone for electronic speedometer - 100% interchangable with mechanical version)

1985 diesel Mercedes upgrades - Mercedes-Benz Forum

From the OP's videos, it appears his car is federal spec., so the transmission should be a 722.3.
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'06 Mercedes E350 station wagon
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'85 Mercedes 300D (#1) sold back to orig. owner after 5 years on 8-1-06.
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  #4  
Old 01-23-2018, 03:16 PM
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My bad, your right. Transmission is the same, torque converter is different, and the vac system that controls the 85 transmission is different (it has the vacuum transducer, also known around here as the blue flying saucer)
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2003 Volvo V70 5 Speed
1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust
1992 BMW 525i -traded in
1990 Silver 300TE -Sold Loved the wagon, hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #5  
Old 01-23-2018, 03:26 PM
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Quote:
Originally Posted by Volvo Diesel View Post
I believe only the '85 California models got the 722.4xx transmissions. The '85 federal models still have the 722.3xx (see the chart below, from the link that follows).

1985 FEDERAL W/S/C123 (300D/TD/CD) = 722.315 transmission
1985 FEDERAL W126 (300SD) = 722.303 transmission
1985 CALIFORNIA W/S/C123 (300D/TD/CD) & W126 (300SD) = 722.416 transmission (300SD had a different tailcone for electronic speedometer - 100% interchangable with mechanical version)

1985 diesel Mercedes upgrades - Mercedes-Benz Forum

From the OP's videos, it appears his car is federal spec., so the transmission should be a 722.3.
Correct, I know mine has a 722.3. I verified when i changed the trans filter and gasket.
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Old 01-23-2018, 03:28 PM
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Originally Posted by dude99 View Post
My bad, your right. Transmission is the same, torque converter is different, and the vac system that controls the 85 transmission is different (it has the vacuum transducer, also known around here as the blue flying saucer)
Mine is currently hooked up like a pre 85 since my BUFO is leaking. Hoping to get a replacement soon.
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  #7  
Old 01-23-2018, 03:29 PM
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So all the door lock and climate control actuators are the same?
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  #8  
Old 01-23-2018, 03:32 PM
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drive shaft and cv shafts should be the same correct?
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  #9  
Old 01-23-2018, 03:48 PM
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everything you mentioned should be the same as far as I know.
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2003 Volvo V70 5 Speed
1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust
1992 BMW 525i -traded in
1990 Silver 300TE -Sold Loved the wagon, hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #10  
Old 01-24-2018, 10:49 AM
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Quote:
Originally Posted by dude99 View Post
everything you mentioned should be the same as far as I know.
thanks
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  #11  
Old 01-24-2018, 11:34 AM
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Quote:
Originally Posted by michael0584 View Post
Mine is currently hooked up like a pre 85 since my BUFO is leaking. Hoping to get a replacement soon.
What is a BUFO?
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  #12  
Old 01-24-2018, 12:00 PM
dkr dkr is offline
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Air intake system is slightly different on the 1985. They fixed the problem with the donuts vibrating out of the air filter container.

The differential is different and the speedometer.

Pretty much everything else is the same. I swapped a 1985 odometer and diff into my 1984.

Dkr.
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  #13  
Old 01-24-2018, 12:12 PM
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BUFO

Quote:
Originally Posted by funola View Post
What is a BUFO?
The “blue flying saucer.” Blue UFO
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  #14  
Old 01-24-2018, 01:08 PM
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Quote:
Originally Posted by oilslick View Post
The “blue flying saucer.” Blue UFO
Ah ok, I usually see it spelled out. 83's do not have a blue flying saucer, only 85 and some 84 model years. 85's tach is also very different than 83.
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85 300D turbo pristine w 157k when purchased 161K now
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked
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  #15  
Old 01-24-2018, 01:16 PM
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No major swap issues, since I installed a ~1982 engine into my 1985 CA 300D. It has the later 722.4xx transmission, which I understand has slightly higher gearing, though that might be the rear-end. I even kept the frame-mounted air cleaner (cut outlet tube shorter to match turbo inlet). On my 1984 300D, I went the other way, installing a 1985 CA air cleaner (no more shaking) and the blue saucer buffer amp for the tranny vacuum signal.

A 1983 would have the "tach amp" for the front crank pickup, but you don't need since 1984+ uses a pickup on the bell-housing which is processed in either the EGR computer or in the dash tach gage (some say it just routes thru the EGR in 1985). The EGR controls are different. The IP doesn't have the rack position sensor like 1984+, which makes getting at the bolts easier (OP's IP is gone). The valve cover EGR switches are a complicated vacuum mess in 1983 (I recall) vs a little micro-switch in 1985. All my EGR stuff is gone w/ Rollguy's block-off plates. I would feel bad except it probably wasn't working and impossible to test and maintain, plus I burn Diesel HPR (bio-based) so don't add net CO2, currently claimed the main threat to life on earth, though this winter may reset Al Gore's temperature plot.

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