86 PU OverDrive problem

I'm trying to diagnose a problem with my 86 Toyota PU 22R Automatic, Home
Depot beater. I don't drive this much on the hi-way, but once in while I
need to get on the freeway. The engine strains at 65mph. I figured out the
OD button the shifter does not work, nor does the OD light on the in the
center console above the radio. Instead of buying a new shifter handle
assembly, I decided to put a SPST switch on the dash and wire it to the
connector under the steering column. But the OD still does not work, or at
least I don't feel or hear the engine shift like on my other Toyota
vehicles.

Is there any way, other that what I tried, to find out if the OD works?
Where else should I be looking to resolve my problem?

Thanks in Advance

Joseph Wind wrote:
I figured out the[color=blue]
> OD button the shifter does not work, nor does the OD light on the in the
> center console above the radio. ?
> Where should I be looking to resolve my problem?
>
> Thanks in Advance[/color]


On my '88 there was a temp sensor on the front of the head, a relay in
the driver foot well, and a solenoid at the tranny. My problem was a
broken wire at the solenoid. Get a book and study the electrics of the
system. The fact that the o/d light doesn't come on may be a good clue
in your diagnosis.

Pat