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  #1  
Old 01-30-2008, 10:30 AM
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rear ratios w123

I have a 1980 nonturbo cd. Am going to put a turbo engine and trans in it, might go with manual, but most likely auto. The engine and auto trans will be from a 1985 300d.. Does anyone know the different rear ratios for these years, also have an 83 turbo parts car I could take the rear out of. Any input on these years differences would be appreciated. I have to pull whatever Im going to use in the next few days, as these parts cars have to dissappear very soon.

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  #2  
Old 01-30-2008, 10:38 AM
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All 240D- 3.69
76-81 300D/CD- 3.46
79-80 300TD- 3.46
81-84 300TD- 3.07
82-84 300D/CD- 3.07
79-84 300SD- 3.07
1985 300D/CD/TD/SD- 2.88

You will need the speedo out of a car matching the diff ratio you use, no matter the transmission. All the 240D, 300D/CD and 79-80/82-85 300TD use a mechanical speedo. All 300SD and 1981 300TD use electronic speedo.

Last edited by ForcedInduction; 01-30-2008 at 10:49 AM.
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  #3  
Old 01-30-2008, 10:44 AM
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All 240D- 3.69
76-81 300D/CD- 3.46
79-80 300TD- 3.46
81-84 300TD- 3.07
82-85 300D/CD- 3.07
79-84 300SD- 3.07
1985 300D/CD/TD/SD- 2.88

I think that 82-84 300D/CD =3.07, and 85's are 2.88.

good post, though forced. thanks fer the info...
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  #4  
Old 01-30-2008, 12:21 PM
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so a cd with the complete 85 drivetrain should make a nice hiway car.
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  #5  
Old 01-30-2008, 01:24 PM
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Yes.

If your 346 rear end is in good shape I would be interested in it.

Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #6  
Old 01-30-2008, 11:33 PM
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3.46 is best with the manual. 3.07 and 2.88 are too high and will wear out the clutch prematurely.
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  #7  
Old 02-01-2008, 03:39 PM
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Quote:
Originally Posted by ForcedInduction View Post
3.46 is best with the manual. 3.07 and 2.88 are too high and will wear out the clutch prematurely.

How long did it take you to swap in the 3.46? I have one waiting for me to install.
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  #8  
Old 02-01-2008, 05:09 PM
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In a shop with the right tools maybe two to three hours. Not too bad.

Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #9  
Old 02-01-2008, 05:25 PM
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In a perfect world, yes, about 2-3 hours. I didn't have a good jack to lift it up and fight the axles at the same time...
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  #10  
Old 02-01-2008, 07:48 PM
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finding

i been looking for a really high ratio one like 2.88 or so can't seem find one any like national parts lookup places or ideas where i can find one?
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  #11  
Old 02-01-2008, 11:47 PM
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junkyard. I think a 2.47 will be the best you can find- dont know off the top of my head which model, but search 2:47 sleeper, it will come.
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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.
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  #12  
Old 02-06-2008, 10:37 PM
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'85 300Ds had a 2.88. If you like acceleration that is as low as I would go.
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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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  #13  
Old 02-07-2008, 12:02 AM
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The 247 ratio came in 380 and 500 gassers....maybe the 560s too.

Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #14  
Old 02-07-2008, 12:12 AM
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I like the 2:88 the most, its the slowest off the line but Ive gotten my car up to 105 before backing off the throttle, in my 84 I hit max rpm's at 93mph

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