Stop in for a cup of coffee

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OK here is a question for the guru's and if I don't get an answer here I will start a thread. I have a Motorhome with a 440 with a 727. The tires are 7.50 x 17.5 and I want to go to 7.50 x 20inch. What do I change in the transmission to have the correct speed register on the Speedometer?
I'm no guru.. but it would all depend on the circumference of the 20" vs the 17.5" tires. Keep overall height the same, no change necessary. If your going for larger tires, math comes inro play.
 
Ben are you trying to make it to Daves?
planning to. can't leave here til Friday morning. wouldnt put me there til late Saturday. still time for a few beverages! i want to pick up some sheet metal for the Scout in Springfield Ohio so it kinda makes for a good trip..
 
Take the train Mikey and jump off as you go past OMR's shop! If you get hurt Hoppy will patch you up. He seems to be getting some practice
 
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