Re: 69 c10 ls/th350
My 6.0 LQ4 donor did not have a booster as it had hydro boost. However the vacuum was on the back of the manifold but it had a plug in it. Pulled out the plug and used a vacuum hose off a 1500 truck that had a vacuum booster.
As far as the TH350 modulator, I connected to a nipple on the manifold on the passenger side. It was capped as well but I just cut off the cap. transmission shifts as it should.
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1962 C10 Longbox LS 5.3 4L60E----Sold$$
2014 Ram 4x4 3500 Laramie Diesel..Momma's truck
2015 Ram 4x4 1500
1997 Boxster.
1972 K10 Custom Deluxe LS 6.0
1950 GMC 3100 S10 & LS swapped
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