Silverado wheel question

[RPOLS3]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: John</div><div class="ubbcode-body">
... If they do fit ....make sure the overall height of the tire is the same as the originals.
... I had a friend that has a 2004 Silverado and he went from the stock size aluminum rim and tire
... to a 20&quot; rim and tire and we noticed on a trip that the truck ran at a lower rpm on the highway
... and would downshift on small inclines and cause the transmission to shift more often.
... and later he ended up having the transmission rebuilt.
... I try to stay with the factory height of my tires .... if I change wheels.
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I think a reprogramming of the computer will fix this - and the speedo will read correctly too. Pretty common from what I understand.