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Old 10-18-2003, 07:12 PM
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Join Date: Dec 2000
Posts: 55
Transmission problem

I have a 1982 300TD (215,000 miles) and I changed the transmission fluid (w/filter change) last week. I am trying Mobil 1 synthetic for the first time. Before I was just using non-synthetic. Now I am having some slippage between 2nd and third. This only occurs when the engine and transmission are not warmed up after about 10 miles it works normally. I checked the level and it is fine. The transmission shifted fine before the oil and filter change. Thanks. Eric

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Old 10-18-2003, 07:59 PM
Member since 2000
Join Date: Jul 2003
Location: Flemington, NJ
Posts: 1,143
Your transmission must not have been serviced regularly prior to this. Try turning the vacuum modulator on your transmission 1 turn clockwise.. keep turning clockwise until you have a healthy 2-3 shift. You could also disable the cold shift valve that softens the transmssion until the engine is warm.
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Old 10-18-2003, 09:29 PM
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Join Date: Sep 2001
Location: Lathrup Village, Michigan
Posts: 2,939
I'm thinking it could be the fluid change. I've been told that a 2-3 flare only at cold is a seal leaking that expands when warmed up. My 190D did the same thing. If older vehicles being switched to syn oil can cause leaks, I guess it can happen in a trans; the molecular structure of the syn oil being smaller and more consistent.
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
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Old 10-19-2003, 07:28 AM
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Join Date: Dec 2000
Posts: 55
I wondered if it was the synthetic. Should I change it back? Also will it hurt the transmission? Thanks
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Old 10-19-2003, 04:04 PM
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Join Date: Aug 2003
Location: Swindon UK
Posts: 34
Can anyone tell me where the modulator valve is on my '95 300D(24Valve) UK Spec Non Turbo


1995 E300 Diesel 124T - 210k
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