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Old 06-17-2004, 11:08 AM
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Join Date: Jun 2004
Location: California
Posts: 19
Question Differential Question

Before I return the 1984 300TD Model 123 (Orient Red) to the shop to check if the correct Diff. was installed shortly after I got the car, I'd like to know if members with the same model have a similar performance?

Consistently about 20.5 mpg, mostly highway driving.
40mph @ 2800 rpm
50mph @ 2300 rpm
60mph @ 2700 rpm
67mph @ 3000 rpm
80mph @ 3600 rpm

If I exelerate (pedal to metal) from standstill making a curve, like in an intersection, unloaded rear tire would give me a short wheel squeel when the second gear engages.

Is this normal?
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Old 06-17-2004, 11:42 AM
rbarnes's Avatar
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Join Date: May 2002
Location: Shreveport, La
Posts: 52
I know the numbers you posted for the 3 highest speeds are very close to the ones observed in my '83 300D. I've been getting 21-24 MPG.
1983 300D Silver -mine- 185,000 w/ donor transmission
1983 300D Gray (Franklin) -parts car- 180,000- no transmission and no oil pan
1994 S320 Silver -wife's-135,000
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Old 06-17-2004, 12:38 PM
84300DT's Avatar
Senior Member
Join Date: Jan 2002
Location: Mass.
Posts: 2,218
mine does about the same speed at those rpm's. your mileage seems way too low for highway driving imo.
my car used ot give a chirp going into 2nd as you describe but the tranny wasn't getting enough vacuum. turning up the vaccuum a bit made that stop, and hopefully resulted in a little less stress on the diff.
1984 300D Turbo - 231k....totalled 11/30/07 RIP
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