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Old 11-11-2011, 05:27 AM
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69 firebird trans issue

I have a TH400 with 3.55 rear and 25" tire. car tachs 3500 at 55 mph. calcultor says I should be at 2700 rpm. any suggestions on whats wrong? trans and converter are new 10/2010. 1800 stall. has anyone pur a 200r4 in a 69 firebird?

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Old 11-12-2011, 08:02 PM
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Hey john, I know for a fact that you must change the speedo gear in the trans when you swap the rear end gears to match. I don't have a link to post but they are easily found on the net. They are color coded for your gear like tan, blue, green etc for different gears 3.23, 3.55, 3.73 etc. I would check that part first and see if it's a different color than it's supposed to be. Looks like a lil plastic gear. Good luck
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