![]() Follow along as his crew gets us back up and running and he takes it home on the dyno, turning Byron's GTA from an old-school hustler to a new-school machine, capable of impressing even the most futuristic of GMHTP readers. Harrison "Doc" Wall, owner of EFI Alchemy, not only ensured us a quality install but also promised to pick up some power, show us some cool custom-OS tricks, and dial in the transmission shift points perfectly. Transmission en route, we hooked up with EFI Alchemy in Jacksonville, who are well versed in both LSx tuning and this particular wiring harness. Phoenix Transmission builds several versions of GM. This isnt necessary on all C10s, but it gave us a lot more room. While this would have been an issue in the past, the EFI Connection harness made it a simple plug-and-play swap, and Century sent us a 27-spline input shaft, which would work perfectly with Byron's existing Yank converter. For the sake of simplicity, we decided to completely remove the exhaust system. A leader in high-performance transmission rebuilds, Century convinced us to ditch the old 700-R4 and upgrade to a much nicer 4L60E unit (identical to the Stage III build we covered in May '09). Enter Century Transmissions and its upgraded 4L60E. 700R4 transmission until electronics were added in 1992. GM TURBO 700R4 350 TH350 4L60 AUTOMATIC TRANSMISSION SPEEDOMETER KIT 41 YELLOW DRIVEN GEAR HOUSING, CLAMP & BOLTS. if your trans has all its components for electronic, it should be able to be used. 700R4 Conversion package (includes transmission & installation) Custom Rebuilt CDT 700R4. ICT Billet 700R4 Billet Speedometer Sensor Port Plug Chevy Transmission Compatible With SBC 305 327 350 383 5.0L 5.7L V8 Designed and Manufactured in the USA Aluminum 551961Z. about doing just the opposite of what you wanting to do. Unfortunately, after getting everything installed we ran into transmission issues with the old 700-R4 and weren't able to really stretch the LS1 PCM's legs. my 700r4 is electronic, think there was an article on bow tie overdrives. During our initial install, our goals were simply a smoother-driving 383 with a more calm idle, better street manners, and (of course) a couple of extra horsepower. If you have been following along with us, you will remember Byron Jay's '89 GTA, which recently received an EFI Connection LS1 PCM/Ignition upgrade (Feb.
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