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.

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.

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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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

so a cd with the complete 85 drivetrain should make a nice hiway car.

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.

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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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

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.

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...

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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2004 Infiniti G35 3.5L 6mt Coupe 73K miles 25.6mpg ytd
2001 Green Audi TT 225 AWD Roadster 71K 6sp 30.9mpg >>STOLEN<<
1982 300D Turbo 231K 120hp? 28.1mpg YTD

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.

'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

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.

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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1981 300SD 512k OM603