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I think it was the TF-1 kit but remember this is a lockup converter valve body.......It has an S-bend tube on the top..... Even before I messed with anything drove the car with the stock 318 2bbl the trans would freewheel in 1 st gear. I remember it would not provide engine breaking in 1st gear but I thin it would if i held it down in first... it would freewheel when left in drive???? TBF



Might be an issue with the over running clutch ? The lockup convertor and it's fluid path should have ZERO effect on first gear operation .