sl320 320sl auto 1996 will not change up into top gear

merc-ypurple

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sl 320 1994, BMW 635csi, BMW 525tds
Having a problem with the gearchange - in drive on the selector, but seems to stay in 3rd. I can travel for 30 miles like this, so not a warm-up problem. Fluid level appears ok. Car 1s R129 1996
 
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andy@pcd-ltd

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What condition is the battery on the car

A weak battery can cause this sort of fault
 

television

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Do you know if your car was made before or after 06-96 or do you know if you have the 772.6 5peed box
 

Alex Crow

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As above - do you have the inline or V6 engine?
 
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merc-ypurple

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The build date was October '95. Straight 6.
Re the suggestion about battery condition affecting gear change performance, would that not be dependent more on the effectiveness of the charging system?
 

Alex Crow

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W169, W124, w202, W203, KTM 250 EXC, VW T25 camper and a Polo in a pear tree
So you will have one of the older 722.4 or 722.3 'boxes - nothing to do with electrics as it is all pretty much mechanical.

Having said that, there is the kick down solenoid and the transmission protection system, but I don't think the latter is fitted with these smaller engines.
 

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