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Re: 1972 th400 speedo error, help?
Tim, did you try connecting the speedo cable directly to the transmission? Try that and see if the speedometer works at all. If so, get a free gps speed app for your phone and see how far off it is. You may not need the adapter. When I bought my TH400 it had an adapter on it that was broken. I did not use it when I put the transmission in, and my speedo is slow by 3 mph per a gps app that I have on my phone. I have 3.73 gears though.
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70 C/10 SWB 402/TH400/3.73 "The Needy Beast"
200,000 Mile Club
Disc Brake Club
Owner installed options:
Front Sway Bar
Power Steering
Power Brakes
Cigar Lighter
Courtesy Lights
Deluxe Side Markers
Wiper Delay
Sliding Rear Window
Power Windows
Power Locks
Sniper EFI
2015 Silverado 1500 LS 4.3/6L80/3.23 lowered 2" front & rear
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