42rh transmission
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You could first try adjusting the kick down cable at the throttle body. This cable tells the transmission how much load (i.e. throttle input). If it is miss-adjusted the transmission thinks that you are not trying to accelerate so it will put it into the higher gear more quickly. If i remember correctly you push the button on the side of the block that holds the kickdown cable at the throttlebody cable bracket and then open the throttle plates to wide open with the other hand. Once the throttle is wide open, then release the button on the kickdown cable bracket.