If you have a us spec car it is then a turbo and for better economy you can swap with minor mods to a 247 diff from a 380
SE. You will give up some acceleration on take off but will work pretty well on the highway.

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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.

Even with 2.88's a properly running 617 turbo shouldn't have problems with hills. If you're having problems on hills, you have another issue-fuel supply issue, ALDA plumbing, fuel supply issue, soft wastegate spring, fuel supply issue, improperly tuned automatic transmission, fuel supply issue, etc.

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Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

I have an NA 300D with a 3.46. I'm not the OP, I was thread-jacking. I don't really have problems with hills now really, have to just be going pretty quick at the bottom to maintain speed at the top I was just wondering how much worse hill climbs might be with a 3.07. I live in the mountains, everything is a hill.

I built up a car using a euro 300D and a 307 diff. Taking off on an incline was a little dicey but once moving I never had an issue. I don't mind shifting down for hills though and some seem to resent it. With a four speed and it all in an 83 240D body it got 30 mpg with regularity.

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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.

Well, you might just have to be a little quicker at the bottom for a run up the hills going to a 3:07. looks like a 11.28% difference between a 3:46 and a 3:07 Diff.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

alright sounds like the 3.96 may be too much then... so perhaps the 3.46, does anyone know what rpm I would be running at 75mph? this is not my daily car but I would like to have a little better off the line especially with the larger off road tires I am putting on it.

I can have someone look at it and tell me how it looks. I have a good mechanic that does my work here and could tell me. How far are you from Baltimore?

That would depend on the tire size you're using.

(0.00595) * (RPM * r) / (R1 * R2) = vehicle speed in miles/hour

where:
RPM = engine speed, in revolutions/minute
r = loaded tire radius (wheel center to pavement), in inches
R1 = transmission gear ratio
R2 = rear axle ratio

linky: http://wahiduddin.net/calc/calc_speed_rpm.htm

The transmission ratio is 1:1 in fourth gear. What are planning on doing with this car?

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

I'm with skippy on this. These engines have good power for climbing hills with the stock gearing. If you put gears in that will raise engine rpm you will really ruin the fuel economy. the engine is an air pump. If you raise the cruising rpm 20% you will raise the fuel burned commensurately....I mean close to 20%, so if you go from the stock 288 gears to 346 gears that is increasing the highway rpm by about 15%. So if you are getting 25 highway mpg now that will drop to about 20.

Its nothing I would ever do.

__________________
[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.

It depends on the intended use. If the OP is going drag racing or mud bogging, deep gears may be a good choice.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 401,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 26,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.
99 Mazda Miata 183,xxx miles.

If he goes mudding in an '85 300D, I want pictures.

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"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes

1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod

2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."

and my intention with the car is to cover it completely in duct tape, put a loud exhaust on it, very large tires, low gearing, strip the interior and replace with racing seats, and lots of other weird things... then eventually start doing something new and unique to my 300cd...

Seriously?

__________________
[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.

well ya... I bought the wheels and tires today, have racing seats from my bronco, the exhaust seems like a pretty easy thing, the only tough things seems to be the rear differential and I want to add a third tank in the trunk as I need more range. Check out my sweet duck tape job though, just search for my other posts.

WOW just WOW!!!

I guess you will need three full tanks in the car if you are going to much much lower grearing.

Duct Tape? Really? HMMMMMM now how old are you? 16???

I really don`t follow this...................oh well.


Charlie

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works