I have 1984 300D turbo. It is 3 speed automatic transmission. My transmission is not shifting from second to a third. All other gears are shifting smooth.
Vacuum is good,oil level is OK.
Any idea what to look for.
Thanks

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)

This should be a four speed automatic transmission. Are you sure you have vacuum at the transmission modulator? I have seen the line come off and it not shift up through the gears.

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Jim

Didn't check vacuum with a vac. gage but made sure that vacuum hose is on.

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'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)

Pull the wire from the kickdown solenoid, right rear of trans. This for sure eliminates the possibility of improper electronic kickdown.

To have a 4spd tranny unless something has been substituted.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

You guys are right,it is 4 speed transmission and problem is shifting between 3rd and 4th .
Thanks for your help.I will be experimenting with kickdown solenoid and any other sugestions that get today.

__________________
'95 s500 (bought for wife but can't bear to share!!!) 125kms
'92 legend 180kms
'88 tbirdturbo(fantastic car-only regular maint.)120kms
'87 mustang gt(gone)
'86 tbirdturbo(gone)
'85 mustang gt(gone-but not forgotten)

My experience was that it would not shift out of first with the vacuum line off. At least try to get a vacuum gauge in the line that ties into the modulator (drivers side about mid-way of the tranny) and see what the vacuum signal is while you are driving it.

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Jim

daddiojiggy

I chased similiar problems on our past diesels. When was the last time the trans had fluid and filter replaced?

Also, the trans modulator vacuum could be the problem. Elsewhere on this site, some with I believe a 380SE improve their shifting by replacing the hard and brittle connector tube between the vacuum modulator and the plastic line going to it.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

I have tried every suggestion that was posted, but no luck!
Found used tyranny with 150 000 km ,cost $200 cdn and $250 for mechanic to replace it.
Back on the road with all 4 speeds.
Thanks for the all advices!!!