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96 F150 carbed 300 with a C6/208 SAS44/9" with 3.55 on 35s.
I put a transgo shift kit in the transmission before putting it in the truck, it also has a small stall. At half throttle you can manually shift 1-2-3 with no issue at all. Under full throttle when you shift to second it won't **** into second until you push the shifter into third. Then it'll go to second and spin the tires when it grabs second in dirt. This is all in 4lo, I was gonna switch to 2hi and try it but it's raining and I don't feel like crawling under it to change it. The truck is a mud toy so will spend 90% of its time in 4lo.
I don't have a vacuum line currently hooked to the transmission because I have the same shiftkit (transgo) in my 77 and no vacuum line on it either and it works fine.
It down shifts fine with that transgo shift kit, I can bring it back to first at any time. It just won't go to second manually when you shift under full throttle.
I'll try a vacuum line, just doesn't make sense that the C6 with same shift kit works fine without a vacuum line on my 77.
Since it sounds like you're doing the work yourself, it's possible a mistake was made when installing the shift kit. For instance, you could have missed changing a spring in the valve body, put the wrong color in, forgot to put the valve spring back in, or missed putting a check ball back in the right place. I wish I had done mine right the first time, too, since I had to R&R it a couple times before I got it right.
(I suggested the easy fix/test first for a reason)
I'm gonna definitely try the vacuum first, just got to remember to pickup some more vacuum hose next time I'm near a parts store.
Yea I do all my own work... this is the third Valve body/shift kit I have done all the same brand on C6 transmissions. Not saying I didn't screw up by any means, but I really don't think that's it. Worse comes to worse I pull a valve body off one of my 2wd C6s I have and put it on to test it.
I built the entire truck from the ground up over the last 4 months.
This is the big 3 contributing trucks... 96 frame/bed and engine that was swapped to carb, 92 cab/front clip, and 77 F150 axles, then the C6/208 came from a 86 Bronco.
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