My friend's 240 speedometer crapped ouot so he stuck a 300d turbo speedo in and now it reads about 2/10 of a mile off ( to high)and 8-9 mph too fast.

are the rear end ratios different or speedo gear and what is the fix if any besides using a 240 speedo

thanks


bennett

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81' 240d 4 spd 140k on the clock

Yes, they are different due to the difference in gear ratios. The 300D ratio is either 3.07 or 2.88 (depending on year). I think the 240D ratio is 3.46. AFAIK, the only solution is to find the correct speedo.

yup- the speedo should stay w/ the rear end.

just as the lugbolts stay w/ the rims.

I believe you can seperate the odo, and keep that with the car. but I may be wrong.(it did happen before, once )

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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.

As said, gear ratio is the key.

As far as getting the right Odo setting, you will need to file off the flats on one end of the pin that goes through the center of the wheels, slip it out, set the desired number, put the pin back in and flatten the end with vice grips or some such.

Good luck,

Just replace the gear set in the tranny with the 300d one.

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1981 300D 147k
1998 VW Jetta Tdi 320k
2001 Dodge Ram 2500 141k
1979 300D 234k (sold)
1984 300D "Astor" 262k(sold)
Mercedes How-To and Repair Pictorials
I love the smell of diesel smoke in my hair

i am not sure what diesel giant means.

the speedo matches the rear end. including the hash marks on the face.

the gear in a 240 is 3:69 from the factory.

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'd like to know what Diesel Giant means as well.

short update*

Friend took out the instrument cluster and pulled his car up on block to view underneath to change speed gear at trans..

Long story short.... oil pressure gauge line was open and pointing at his legs and floor...

you know what happened next as he drove up on the blocks.
IF this doesnt' work Diesel Giant owes him a new pair of pants and a floormat

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81' 240d 4 spd 140k on the clock