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So, I drove my Bullnose truck to work today. Going to work I drove through the city at 45-50mph and I noticed that my VRV seemed to be out of adjustment. It would shift 1-2 at about 23mph and then 2-3 at about 28mph.
Coming home I drove on the highway. It seemed to do ok, but getting off the highway and driving through town the 1-2 shift was at 18mph followed immediately by the 2-3 shift.
I tested the vacuum going into the VRV (top port) with the truck idling. It has 20" of Hg. Then I followed the directions here in an attempt to adjust it.
When I was driving home yesterday I started in 2, then manually shifted to 1 and then D. It drove fine that way. Apparently that B&M shift kit allows manual operation of the transmission. This is puzzling, some sellers indicate that you can't control the transmission manually.
I looked in my parts bin and found the original instructions. The kit I got was closer to what was pictured in the Summit link. I didn't get a valve body separator plate.
Ultimately, I think I'm going to drive my truck again today and try to shift the transmission manually (2,1,D). I'll provide an update. My daily driver 20 F150 is actually in the shop getting a 10R80 rebuild at 55k miles.
Well, I'm pretty confident my VRV is on the way out. I've been driving my Bullnose the past few days. Sometimes it shifts fine and sometimes it revs to like a million RPM in 1st before immediately shifting to 2nd and 3rd. If I manually control the gear selector starting in 1, then going to 2 and D it drives fine.
I guess I need to inquire about a new (or rebuilt) VRV from the above supplier. I had a lead on a parts truck and when I mentioned it to Momma she shot that down pretty quick.
From page 80 of the 1986 F-Series 150-350 owner's guide:
The automatic transmission provides fully automatic operation in D(DRIVE). For manual control start in 1 (LOW) or 2 (SECOND) and then shift manually.
Apparently, no shift kit is needed to operate the C6 manually.
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