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#1
12-25-2006, 07:02 PM
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not always going into overdrive
I have a 99 E320 with 185k. Last week when I was on the freeway I noticed it took several miles before the car shifted into overdrive. It happened 2 of the 3 times I got on the freeway. The 2 times it did it the temp. outside was about 50 degrees. The 1 time it went right into overdrive it was about 70 degrees.
In Feb 2006 when I got the oil changed they said the shift bushings were gone. I didn't fix them because they said it was not critical to fix them right away. Any thoughts? 
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#2
12-25-2006, 07:30 PM
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Mercedes don't have overdrive. Your car isn't shifting into 5th gear.
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#4
12-26-2006, 09:00 AM
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The definition of overdrive is when the output turns more than 1 revolution for every revolution of input. Mercedes do indeed have overdrive - 5th gear in my car is (92 300SE) is 1 revolution of the transmission output shaft to every (I think) .70 revolutions of the crankshaft.
Overdrive can be in any gear (the latest Corvette has OD in 5th and 6th gear). Far as I know, any MB car that has a 5 or 6-spd automatic has OD in the top-most gear. The shifter bushings can make a big difference, especially if the shifter is vague enough (due to the missing bushings) to not properly set the shift-position switch to tell the transmission that top-gear has been selected via the shifter. Try downshifting to 4th and then upshifting to 5th and see if that helps. I'd get the bushings replaced - and pulling codes is definitely good advice.
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#6
12-26-2006, 12:49 PM
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The trans control maodule can set off the check engine light, definte good advice to check the faults in both modules.
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#7
12-26-2006, 02:11 PM
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Quote:
Thanks for clearing that up. I was refering to OD in the American and to a certain extend Japanese car sense. Ie it operates as a 3spd and won't shift into "OD" unless you push a butten or move the gear lever. But you can't use it around town because it lugs the engine down, or in Toyota's case overheats the trans. MB's use a straight 5spd, 4spd whatever, put it in drive and it does its thing.
__________________
2016 Corvette Stingray 2LT 1969 280SE 2023 Ram 1500 2007 Tiara 3200
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#8
12-26-2006, 02:45 PM
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Hatterasguy - OK - gotcha.
I'd always heard about that issue with American cars, too, but I've largely ignored it on the cars that I've had with no negative effect. The biggest problem I've seen, and you noted it in your reply, was the lugging effect from being in too high a gear at too low a speed. My '92 300SE doesn't shift to 5th until 50mph, which prevents that lugging problem, but I'm having a time getting used to that high shift point vs my '93 Lincoln Mark VIII which shifts to 4th (OD) at about 38. Transmission design dictates the implementation method of the OD. In my Lincoln, it's the same as my MB, the OD is electrically controlled. In my previous Lincoln ('92 Mark VII), OD was mechanically selected via the shifter - but the wierd car lacked a shifter position for 2nd - only had 1, 3 & 4 as valid shifter positions. I think in the case of the 722.5 transmission, it's basically a 722.X 4-spd tranny with an electrically-controlled OD gearset added post-design. Who knows - just so long as it works - with a 3.69 rear gear, I need OD bad....
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