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Old 04-09-2008, 07:54 PM
jean-karim jean-karim is offline
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th 700r4 lock-up

Hi All!

I have a carb 355 engine swap in my LG4 1985 Trans-am , no more ECM and still the TH 700 tranny , so I need to get back my lock-up working , so so far that's what I did : I tracked the original lock-up wiring coming out of my tranny what is exactely happening is when I wired the purple wire to 12V brake switch and wired blue together with tan/black it locked in all gear from 1 to 4...and even braking did not unlock...Then I've tried wiring still purple to that 12V ( by the way there are 2 brake switches at the pedal , one seems to have a vacuum? ) and tan/black to ground , blue to nothing and again locked in all gears ( did not try up to 4 ) then I've tried again purle to same 12V and blue to ground and tan/black to nothing and driving in city it did not lock in first 3 gears , did not try fats enouph so check 4 . So would that blue to ground and purple to 12v would be the way to lock in 4 only?
Thanks lot!!!!
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