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Hi
I have an 1989 Isuzu Bighorn 2.8 Turbo Automatic.
Since I got it 7 years ago, every now and then, a little light "O/D off" flashes. SOmetimes for a few minutes and sometimes for a day or two. My mechanic told me to ignore it.
In the last couple of days, I have noticed the truck will not change into top gear on the motorway. It gets to a hundy okay, but the RPMs are up at 30.
When I pressed the power or Normal drive buttons. Nothing happened.
I checked the Transmission and it was a little low, so I put in a litre. The O/D off light is now on. and when I press the Power drive button, Power drive the light comes on. It still does not seem to be changing onto top gear.
Is this an indication of maybe a sensor failure somewhere or is at about to blow up? From reading this forum and others, I suspect that there may be a temperature sensor not working correctly or am I barking up the wrong tree.

Should I do a complete change of transmission oil?

Any suggestions would be greatly appreciated. I have a mechanically mined mate who is quite capable of changing sensors etc, but does not want to stuff around if he is not sure what is wrong.

Did you get it fixed?

the original poster last logged in in 2012

Thanks Geeves, i'm new here and didn't realise that.

Often threads never see a conclusion. Every just thinks a lack of responce means it must be fixed.
In this case I had a look at the original poster and see hes long gone so must be ok. I dont think you can see the log in status of other members so you couldnt know but each post is dated

Thanks for the Info Geeves.