reelmagic Posted December 15, 2016 Report Share Posted December 15, 2016 If I had an auto 720 and a 5 speed parts truck, outside of the obvious how hard is the conversion from auto to manual? Does the electric harness need to change? What are the pitfalls? 1 Quote Link to comment
datzenmike Posted December 15, 2016 Report Share Posted December 15, 2016 If you have all and I mean ALL the parts on the 'parts trruck, it's just mechanical. Electrical? The automatic transmission has an interlock switch that prevents the truck starting in any position other than PARK or NEUTRAL in order to start, These two wires must be joined together. The reverse lamps must be wired to the 5 speed reverse switch..... that's about it. What year 720. There may be differences in differential ratios between an automatic and a manual. The speedometer would be very wrong reading. 2 Quote Link to comment
reelmagic Posted December 15, 2016 Author Report Share Posted December 15, 2016 1985. Both trucks are running and drivable. The one just has lots of rust damage. I thought that would be the case, I was just a little worried about the interlock. Thank you very much for the info. 1 Quote Link to comment
datzenmike Posted December 16, 2016 Report Share Posted December 16, 2016 Yellow/White and Yellow/Red are the two reverse lamp wires. Polarity does not matter on the 5 speed transmission switch. It's the one about 5" to the rear of the clutch fork boot, about half way up the side. Brown and Blue/Red are the two inhibit wires that need to be joined together so the ignition works. Quote Link to comment
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