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#1
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300sdl transmission problem
Hello-
My 300sdl is a 300k+ mile car and the transmission is not shifting properly. I bought the car 50K miles ago at auction so I only know history via inspection. I suspect the transmission is original. With that backround - the tranny doesn't shift into 4th gear. Here's what's been done: - filter and fluid about 10K miles ago, fluid was good then, and still appears as it should. Also passes the smell test. - Tried Trans-X 200 miles back - no change. - Ruled out bowden cable and kickdown switch. - Checked all vacuum lines for leaks / have not hooked up a vacuum tester. Now for some additional symtoms. If the car sits for two weeks or so - the tranny will shift into 4th. Although as opposed to the robust / solid shift of the prior gears- I'll say it sliiiiiides into 4th. The car will shift fine for 20 miles or so, then I lose 4th gear. If I keep driving - I'll go another 10 miles or so then I'll lose 3rd gear. I havn't pressed my luck past that. I suspect I'm in for a major rebuild - but would like to have some idea what's causing the problem. Any help would be greatly appreciated. Glenn |
#2
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Well over 300k miles is quite a feat for an automatic transmission that's nearly 20 years old. I'd get ready for a rebuild honestly, but there's a few things you could check out prior to doing so.
The modulator on the case (driver side I recall) could be the problem. You could try pulling those vac lines, cleaning them, and reinstalling too. I believe new modulators are around $35-50. Just a few other things before throwing in the towel. Hope it helps.
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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] |
#3
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try this: 300SDL Engine/Trans vacuum or Trans sticking?
connecting the vacuum lines back correctly actually fixed my problem. Check that valve on your IP though.
__________________
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 |
#4
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i had the same problem
i had 83 300 sd tranny problems and i could not figure it out so i
disconnected the vac to the tranny.... and stuck a stick in it... at the valv ontop of the fuel pump.... and the problems went away.... so i need a new vac control for the shift... try this..... |
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