Join Date: Feb 2010
Location: Benbrook, TX (DFW)
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I won't claim to be a transmission expert, but I have rebuilt a couple C6's. I can't claim what happens on all C6's but I know how mine works. Originally, You could select gears manually but the speed of travel still had veto power, so to speak. When I did the rebuild, I installed the B&M Transpak (when you say shift kit, are you talking about the "shift improver kit" or "transpak" ??? -- transpak = shift improver kit + manual control). The manual control part of the equation is obviously what we are looking for here in your case.
Now I can put it in 1st, and stay in first, or 2nd, and stay in second, with no up or downshifts, at ANY speed. (Handy for a 4x4.... sucks to have your tranny shift just when you start to get momentum.) Of course, in drive, original auto functionality remains. (As someone else asked about the year, this supposedly applies to 1967-1991 C6 trannys)
Anyways... that's how it works with my two C6's ('76 & '78).... hope one of us is able to help.
PS - even so it sounds like you might have another problem as well, because with or without a Transpak kit the 1-2 shift should pretty much happen when you put it in 2nd anyway unless you just started moving and are accelerating really hard.
I'm not trying to be long-winded here, but let me try to get this out in a semi-coherent mess.
All C6's should pretty much act like a manual when upshifting 1 to 2 to D.... they will accelerate into the gear the selector is in and then stop until you bump it to the next one. The time it doesnt act like a manual is when you go back down... speed has veto power. 2 is reachable, 1 is not, unless you literally slow to a crawl. I think thats why we are getting different opinions here.
Its just like Dragz79 (Scott) said - all of his shifted like manuals EXCEPT when the speed was too high. Thats not true manual.
Which brings us to 2 points:
1 - In MY opinion, which is probably worth about a cent and a half, you need a Transpak or similar to get TRUE manual functionality.
2 - Also in MY opinion, what you are describing shouldnt be happening whether you have a transpak or not. It should shift to 2 when you go to 2, unless your really mashing that gas.... sooooo you might have some other problem (need more info to know what that problem may be - band, governor, servo etc)
Ok I'm done. Sorry for the essay
78 Ford Bronco - 460, C6 manual shift, np205 twin-stick, custom interior, 4" suspension lift, 35" boggers
97 Honda Accord EX - 2.2l VTEC, intake/exhaust mods, performance brakes, stock body (35mpg)
99 Ford Explorer XLT - 4.0l SOHC, mostly stock
It may not look like much of a collection, but it beats making monthly payments...
Last edited by bigoldbronco; 02-12-2010 at 08:12 PM.