Ok at 3000 rpm's on the highway the speedo reads about 68mph.

What does yours read??

Yes I am in high gear in a 84 300 D

__________________
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'm at about 80-85...1985 300sd...I think 2.88 in the rear end

I'm at around 68 too at that RPM, or 70 @3100 in fourth. That's normal, or so I thought. I have an '85 300D with the 2.88. Do the SDs have an extra gear in the transmission or what? I thought 70 @3100 was normal spec for 617.952/722.315. Do I need to take corrective action?

__________________
'02 BMW 325i
'85 300D 450k
'93 190E 2.6 170k(killed by tree)
'08 Ducati Hypermotard 1100S 6k
'06 Ducati S2R800 14k(sold)

I am also at around 69-70mph at 3000rpm, as is our 1983.....

__________________
-diesel is not just a fuel, its a way of life-
'15 GLK250 Bluetec 118k - mine - (OC-123,800)
'17 Metris(VITO!) - 37k - wifes (OC-41k)
'09 Sprinter 3500 Winnebago View - 62k (OC - 67k)
'13 ML350 Bluetec - 95k - dad's (OC-98k)
'01 SL500 - 103k(km) - dad's (OC-110,000km)
'16 E400 4matic Sedan - 148k - Brothers (OC-155k)

In the '87, between 75 and 85 depending on the grade ... but that I guess is not useful information for an '84 driver ...

__________________
1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

i think the sdl and sd have 2.87 or 2.65 depending on year. hence higher speed with 3000 rpm.

__________________
[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.

my 87 300d turbo does 80 to 82

__________________
87 300d Turbo 241K with original #14 head (blue)
87 300d Turbo 198K will run great again someday (silver)
84 300sd sold ( buyer drove it to Paraguay )

3000 RPM makes the Grey Ghost (300SD) go 85mph with a 2.47 rear end and 15" whels..

3000 RPM is about 85 mph (137 km/h) in the 300D 2.5 Turbo. I am not sure what the diff ratio is, I haven't looked at it yet.

__________________
1991 MB 300D 2.5 Turbo (207000km) (now gone)
1993 Audi 100 CS Quattro (300000km)
1999 VW Jetta TDI (290000km)
2002 Audi A6 3.0 Quattro (150000km)
2005 MB E320 CDI (34000km)

I worked it out once for 3.07 rear end, 14" wheels with orig. 195 X R70 tires.

Came out to 66 mph @ 3000 rpm ( 22 mph /1000 rpm). FWIW

__________________
The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)

took a trip to indy today. 73 mph at 3000. 85 degrees on the dash, 95 outside with the air on recirec. book says this has a 2,87, the 300d 2.5 says it is a 2.65. this squares with the rather doggy acceleration that i experienced with my 300 2.5. although i now think it probably had a clogged intake after reading here all about it.

__________________
[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'll find out and report back.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Around 72-73mph @ 3000rpm with the 2.88:1 axle.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

had a revelation the other day... 2.87 and 2.88 are the same rear end. all this time i had been thinking that they were significantly different!

__________________
[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.

Checked on my way to work. My 1984 300D did just a hair below 70 at 3000 on fairly level ground.

__________________
Doug

1984 300D 130,000 miles "Silver Blue Metallic"