Correcting speedometer

Just took my 87 Toyota 5 speed manual transmission and put 29 inch tires on
it. The previous tires where about 26" diameter. Question> How do I get the
speedo to read right? thanks.

"Mike" <dieselcowgirl@gulftel.com> wrote in message
news:dk924m01f4r@enews4.newsguy.com...
| Just took my 87 Toyota 5 speed manual transmission and put 29 inch
tires on
| it. The previous tires where about 26" diameter. Question> How do I
get the
| speedo to read right? thanks.
|
|

You should be ok with what you have. What does the door sticker list as
the tire size? Mine listed 225's. I had an '87 that came with 33's the
previous owner had installed on it. Way too much tire for me. Before I
put 235's on it I used this calculator
[url]http://www.dakota-truck.net/TIRECALC/tirecalc.html[/url] to find the
odometer/speedometer correction. When I put the 235's on it they were
right on according to the mileage markers and construction radar signs.

--
Jarhead

"We have no government armed with power capable of contending with human
passions unbridled by morality and religion...Our Constitution was made
only for a moral and religious people. It is wholly inadequate to the
government of any other."
-John Adams

There are speedo calibration calculators on the 'net that will help you.

The easiest thing should be to go to an offroad shop (or a speed shop, in a
pinch) and see if they can help. Basically, the speed sender lives in the
transmission (transfer case if a 4WD) and picks up from the Output Shaft.
There is a small plastic gear that changes in size for the various tire and
gear set combinations.

Don't forget, since you made the tires much bigger, then you will alter the
performance curve on your truck. It won't have the same pick-up that it had,
and it won't perform as well on hills as it used to. This is a function of
the gear set in the differential(s). If yo have 4WD, then you have to change
the gear sets in both diffs, if you only have 2WD, then you only need to
change one gear set.




"Mike" <dieselcowgirl@gulftel.com> wrote in message
news:dk924m01f4r@enews4.newsguy.com...[color=blue]
> Just took my 87 Toyota 5 speed manual transmission and put 29 inch tires
> on
> it. The previous tires where about 26" diameter. Question> How do I get
> the
> speedo to read right? thanks.
>
>[/color]