Re: 1990 Suburban 4x4, TH400 to 4L80e swap
Hello. You do not the need the neutral safety switch on the transmission. They were used on later model trucks with digital guages. You stock one is fine.I believe your steering column will shift through all the gears but they will not line up on the shift indicator. You can replace your three speed indicator with a 4 speed shift indicator. It will read over drive, drive, 2,1. I sent some pics for reference from the LMC truck magazine.
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