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Old 03-28-2010, 06:25 PM
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Join Date: Nov 2002
Location: Wakefield, RI
Posts: 2,145
Transmission tuning question

I've read every thread on tuning/adjusting transmissions but cannot distill exactly what I need to do. The car is a '83 300D. The shift firmness is pretty good once warm but I have a slight flare on 1-2 and 2-3 shifts, occasionally it will stack the 2-3 shifts and 3-4 is always nice and crisp.

I would like to make all the shifts nice and crisp like 3-4. The shifts occur at the right rpm's, except when it stacks 2-3 occasionally. I have tried adjusting the bowden, VCV and modulator. Currently the VCV is adjusted to 10in vac and the modulator is turned up enough that 3-4 is just a bit too harsh but 1-2 and 2-3 still have a bit of flare.

So what do I need? The only thing the Superior kit appears to fix for me is the stacking 2-3? Or is this a K1 or K2 replacement issue?

What say the trans gods?


When all else fails, vote from the rooftops!
84' Mercedes Benz 300D Anthracite/black, 171K
03' Volkswagen Jetta TDI blue/black, 93K
93' Chevrolet C2500HD ExCab 6.5TD, Two-tone blue, 252K
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Old 03-28-2010, 06:59 PM
Alastair's Avatar
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Join Date: Mar 2002
Location: South Wales U.K.
Posts: 1,064
Sounds like a combo of general wear in the trans. and the usual faults in the trans that cause flaring 2-3...

A Trans rebuild should do it--There is only so far you can go covering up faults caused by wear in the trans....

Alastair AKA H.C.II South Wales, U.K. based member

W123, 1985 300TD Wagon, 256K,
-Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog.

W114, 1975 280E Custard Yellow,
-Great above decks needs chassis welding--Really will do it this year....
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Old 03-28-2010, 07:28 PM
Biodiesel300TD's Avatar
Join Date: Dec 2004
Location: Albany, OR
Posts: 4,845
I had good success with a K1 spring kit getting rid of my 2-3 flare that was pretty bad when cold, and still not gone when warm I would suggest the K1 spring, rather than the Superior kit just because the K1 kit it only $13.
'04 Jetta TDI Wagon
'82 300TD ~ Winnie ~ Sold
'77 300D ~ Sold
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Old 03-29-2010, 12:56 AM
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Join Date: Sep 2007
Location: Long Beach,CA
Posts: 46,195
Here is an article on the trans adjustment.
84 300D, 82 Volvo 244Gl Diesel
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Old 03-29-2010, 04:48 PM
compress ignite's Avatar
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Join Date: Feb 2004
Location: 32(degrees) North by 81(degrees) West
Posts: 5,554
Tranny Adjust

Here SMR's interpretation:

It's CRITICAL... how you set your transmission's vacuum system on your diesel MBZ...

'84 300SD sold
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