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Old 02-23-2018, 07:20 PM   #1
71chevyJim
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Join Date: Sep 2014
Location: White Sulphur Springs,WV
Posts: 6
Speedometer gear for TH400 transmission

My truck's speedometer shows about 75mph when I think I am going about 45 to 50 mph. Can anyone tell me how many mph one tooth on the driven gear will change the speedometer? The driven gear that is in there now is a 40 so do I go up in teeth or down. I am thinking going up will bring the speedometer down. Any help will be great! Thanks Jim
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