Author Topic: late gear change  (Read 2526 times)

nick350

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late gear change
« on: October 29, 2006, 14:23:40 »
I have had an exchange gearbox fitted and it sort of seems OK other than that now I have to get to about 45 mph before it finally changes into 4th then of course if I slow down it slips into 3rd too soon. I never seem to be in the appropriate gear. It was quite smooth until recently. Any ideas?

Cees Klumper

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Re: late gear change
« Reply #1 on: October 29, 2006, 15:24:18 »
There is a (modulator valve?) pressure setting that, as far as I know, affects the shift points. Have you tried the search function on this site yet? There could also be relevant information here: http://www.sl113.org/articles/default.asp

The ignition timing also affects the vacuum that helps to regulate the transmission shift points, but I am assuming the ignition was not altered when the transmission was swapped out, so 'technically speaking' (that's a pun I believe) it should not be a factor in your situation?

Cees ("Case") Klumper in Amsterdam
'69 white 280 SL automatic
Cees Klumper
1969 Mercedes 280 SL automatic
1968 Ford Mustang 302 V8
1961 Alfa Romeo Giulietta Sprint Coupe 1600
1962 FIAT 1500S OSCA convertible
1972 Lancia Fulvia Coupe 1.3
1983 Porsche 944 2.5
1990 Ford Bronco II

ja17

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Re: late gear change
« Reply #2 on: October 29, 2006, 20:07:05 »
Hello Nick,

These people have given a very nice write-up on the initial set up of these units. Take a look! http://www.mercedesdismantlers.com/16BoltInstallationInstructions.html

Joe Alexander
Blacklick, Ohio
Joe Alexander
Blacklick, Ohio
1969 Dark Olive 280SL
2002 ML55 AMG (tow vehicle)
2002 SLK32 AMG (350 hp)
1982 300TD Wagon turbo 4spd.
1963 404 Mercedes Unimog (Swedish Army)
1989 flu419 Mercedes Unimog (US Army)
1998 E430
1974 450SLC Rally
1965 220SE Finback