MIN007

Hi All Can anyone help ??. Have a 1991 LS400 and the overdrive light starts flashing after driving for about 10 minutes. Kickdown normally doesn't work once this has happened but if it does, revs go sky high .... 6000+. Gear change is normal though. Any ideas what this might be ????????. Thanks

Hi All Can anyone help ??. Have a 1991 LS400 and the overdrive light starts flashing after driving for about 10 minutes. Kickdown normally doesn't work once this has happened but if it does, revs go sky high .... 6000+. Gear change is normal though. Any ideas what this might be ????????. Thanks