Yes.

The non turbo is particularly nice with a stick.

I have a 300na euro motor in my 83 240d with a stick and 307 diff. Its a little iffey taking off but the motor has enough torque that its always a pleasure driving it. I also have a five speed od tranny and on the highway its eriely quiet and smooth.

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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.

If I really liked the milage of the 240d, had a car that has had a lot of work done to it (I do) and wanted to go up freeway grades faster in my 240d, I would look at putting a 5 speed in it. Forced induction said 3rd in 240d has 2.25 ratio, which makes useless on freeway- mine's not starting cold, so I can't test top speed in 3rd, but I've never been tempted to run 3rd at 55 in the 240D the way I did in my Chevette. rrnss from india reports an in production an indian 616 compatible (?*) 5 speed pn "The gear box name is G1-18/5B

1st gear ratio 4.695:1
2nd gear ratio 2.401:1
3rd gear ratio 1.436:1
4th gear ratio 1.000:1
5th gear ratio 0.806: 1

reverse 4.078:1"
So if you raised the 240d rear axle ratio from 3.46 to 4.27, 3rd would be same as 1.78 on a standard 240d, making it more useful on the freeway. I don't see any use of a real overdrive in 240d, mine horsepowers out for top speed on the flats. I don't drive over 70 much anyway (*post says some difference in the clutch pilot bearing diameter)

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'80 240D biege "Mercey Bird"
'80 240D light blue "Slug"
'80 300SD dark blue "Theodin"

standard diff in 240 is 369. 346 is for 300 na. i think a stock 240 will benefit from a five speed od.

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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.