Test for 4th gear switch is to hold shift lever hard down and to the right. That is supposed to make better switch contact. If that doesn't help on a bumpy road, than I would look again at the OD relay. I had to use a loupe and strong light on mine to see the cold solder joints at the junction of circuit board to base. Only then was it very obvious. Textbook cold solder joints. I had similar problem where if I could get OD it would switch itself off, often over bumps.
Type F ATF recommended for M46. There is a filter(s?) in there to clean.
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1985 744 gle d24t
1985 745 gle d24t
Last edited by ngoma; 05-02-2013 at 09:53 PM.
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