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**HO455** · 11-03-2022, 05:03 PM

Does the speedometer seem accurate? Those early electronic speedometer systems are funky and if someone mixed and matched parts in the past you could have a speed error.

That's the plan when the laptop is back. First test the brake and vacuum inputs while faking the speed input to see if it provides a solenoid output on the bench.
Then plug it back in the truck and throw some jack stands under the rear axle to check the speed input and solenoid output.

11-03-2022, 05:03 PM	#141
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,910	Re: 700R4 TCC Wiring Does the speedometer seem accurate? Those early electronic speedometer systems are funky and if someone mixed and matched parts in the past you could have a speed error. That's the plan when the laptop is back. First test the brake and vacuum inputs while faking the speed input to see if it provides a solenoid output on the bench. Then plug it back in the truck and throw some jack stands under the rear axle to check the speed input and solenoid output. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377