Toyota Trucks: Factory speedo adjustment for different size tires?

On older models where you could get either 225x15 or the 31x10.5 tires ---
the cars were differently geared. Newer models have computer controlled
speedos so suspect it would be a simple reprogramming.

"Jim Mc" <com> wrote in message
news:com... 

So for vehicles with computer controlled speedos, do Toyota dealers
offer this reprogramming for customer's who change tire size, gearing,
etc.? I've seen the (fairly expensive) inline devices for adjusting
speedometers, but if the main computer is programmable (and assuming
the programming is accessible to a technician) it would seem to make
these devices obsolete.


On Thu, 1 Jan 2004 21:18:09 -0500, "Wolfgang"
<net> wrote:
 

Their are different speedo gears for different size tires. Unfortunately
they also usually have different driven gears. Not all speedo drive gears
and driven gears will mate up, so you will probably have to buy both.

Don't expect your local parts guy to be very enthusiastic about looking this
stuff up, Toyota only offers the stock setups, but with all the different
rear ratios and tires sizes a little looking will probably get you what you
want. For late model trucks, the T100 is a good place to start because they
had some really wild rear ratios.



"Jim Mc" <com> wrote in message
news:com... 
tires --- 

My understanding of what Wolfgang was saying is that the newer
speedometers aren't adjusted through physical gears, but instead
through programming. Which makes perfect sense - this approach should
be both cheaper to produce and more flexible. I was just wondering if
that programming is accessible after the truck leaves the factory.


On Tue, 06 Jan 2004 02:53:34 GMT, "lcnut" <rr.com>
wrote: