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#1
03-10-2013, 09:15 PM
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not happy with tall gear ratio
82 300sd
Po swapped out stock rear end for taller gears, changed speedo to match. Dont't know what ratio. Not happy with the hill climbing ability, great on the highway though. Anyone know if it is worth swapping back to stock? I dont have the stock parts so would need to source them.
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing. 
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#2
03-10-2013, 09:18 PM
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Perhaps you can adjust the transmission shifting to have it stay in the lower gear a little longer.
__________________
85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#3
03-10-2013, 09:23 PM
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Did that, still useless on steep hills. Reving too high or too low. Hold it back a gear and it is either turning too high or low.
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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#4
03-10-2013, 09:25 PM
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the shift stick is there for a reason ..
Drive ... Slope ... Low ...
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current fleet Ford f350 dully 7.3L 1990 . ats turbo , zf5 Mazda 4x4 b2600 with 617 20-26 mpg  Past fleet 1983 240D w123 232k 25-30 MPG 1984 Ford f250,1979 ford 150 300-6 (sold@ 251K ) 81 300D, 79 240D , 2x 76 300D ,74 240D , 2x 89 grand prix , 85 grand fury , and several other fords Custom machine shop work ..
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#5
03-10-2013, 09:29 PM
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Jump too far in ratios with the change?
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#6
03-10-2013, 10:09 PM
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Think so. Dont know what is in it now. 2500 rpm at 120kph, almost never get past the tc stall driving in the city. Sits at 2200rpm up through all gears unless I am heavy on the throttle or accelerate past the tc stall. Get fantastic mileage on the highway. Alda delete, run tires at 40psi, egr delete, bowden set tight, all air deflector panels in place. No junk in the trunk. Willing to give up the highway mileage though as half of my trips are up and down hills. I try to go out of my way to take the highway as it useless otherwise.
Had the car for two years now, almost have it mechanicaly sorted out, the gearing has been bothering me for some time and it is coming up on tge to do list.
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1982 300sd, new project car to restore It doesn't matter if you know what you're doing, as long as you look like you know what you're doing.
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#7
03-10-2013, 10:15 PM
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Put low profile tires on your car. You want to anyway. My 85 300D turns 2500 at 100kph
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85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#8
03-10-2013, 10:21 PM
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Quote:
 I think you have put in your diesel taller gears than I have in my gas 4.3 V8... I usually see tacho around 3000 RPM for... I guess 140 km/h ish. Maybe mess with the turbo and fuel injection so you can possibly climb Centennial pkwy or whatever. Sit at 2200, you mean you are in stall zone the whole way? And... maybe more impressive (for me at least), you have 617 and working tachometer?!
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#9
03-11-2013, 12:42 AM
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Quote:
Here is your solution: Slow to 110 Kph for hills. Drop the trans into 3rd gear. The engine will turn a comfortable 3500 rpm up the hill. At the top, shift up to 4th and accelerate to 120Kph. Much less costly than changing the diff back to a 2.88 (which will probably drop the highway fuel economy).
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#10
03-11-2013, 04:40 AM
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I'd check the ratio first.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits!
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#11
03-11-2013, 07:28 AM
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What kind of mileage are you getting on the highway? We converted a 300SD and it was getting about 27-29 highway with a 2.47 ratio. Those must be some serious hills your climbing....ours had no issues with that and it even had the lower stall (1600rpm) torque converter. 3rd is easily good to 50-55mph for normal cruising without issues with the 2.47 diff. On the highway it was around 2400-2500rpm at 70-75mph, no issues with hills of normal size.
My car is the opposite, I have the 3.07 diff with high stall torque converter, its a torque rocket ship in the city, but does high rpms on the highway of course...
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-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)
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#12
03-11-2013, 10:59 AM
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What is the ratio now? I've got an 85TD which I believe has the 2.88 and I live in Colorado. I'm happy with the 2.88 in the mountains.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#13
03-11-2013, 11:06 AM
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I checked my car and it seems to lock up the torque converter at about 16-1700 rpm.
I didn't measure it by holding the brake and using throttle to see how high it went but rather just driving it. When you find it revving "too much", is that just by the amount that it is when it is in one gear lower? Wouldn't that amount of RPM change be the same whether you had tall axle ratio or low?
__________________
85 Merc 300D - Unwinding 31 years of wear 86 VW TD Mahindra Diesel Iseki Diesel In 2007 I didn't own a diesel.
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#14
03-11-2013, 11:14 AM
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My question is this.
what's the 0-60 time? your vehicle may not have the HP to climb the hill due to timing, injector, or alda issues. do you have a cat on the exhaust? possibly a brake caliper is dragging? MB designed the vehicle to have a specific ratio, and changing it of course will have effects, if your car cannot climb the hill,(what's the grade and duration of the hill?) something needs to change. either the HP needs to go up, or the speed needs to go down, or the ratio needs to be shorter, or the tires need to be smaller... I vote HP...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#15
03-11-2013, 11:17 AM
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Quote:
I'd KILL to have a lock up TC in my cars... 
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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