2000 S80 Automatic gearbox selection problem

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
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jh berning
Posts: 1
Joined: Fri Mar 13, 2015 12:26 am
Year and Model: s80 2000
Location: south africa

2000 S80 Automatic gearbox selection problem

Post by jh berning »

Hi, I have a Volvo S80 2000 model. the problem that I have is when I drive at about 80km/h the gearbox engages 4th gear and immediately kicks back to 3rd gear. At this speed it keeps on shifting between 3rd and 4th gear. Above 100km/h it stays in 4th gear and seems to have no problem staying there. Driving it in manual there is no problem. What could be the problem?

Posts: 116
Joined: Tue Aug 06, 2013 5:43 am
Year and Model: 2000, S80, NA
Location: 06776

Post by jbkeene »

maybe dirt in a solenoid valve?

try draining the fluid and filter change
it will change out about 1/2 of the fluid
also maybe change rear fluid as well

they sell kits to do this at FCP or IPD

make sure you use the proper fluid...DEX VI for a GM tranny
when I did this, I replaced the 1/2 fluid with Castrol synthetic DEX VI and didn't have a problem
the synthetic is a good detergent to clean things out

I now am at full synthetic...having sucked a liter-at-a-time out, over a year's period, replacing it with the Castrol

smooth as butter

also, read up on the horror stories on this forum of people switching to synthetic before you do this

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