*****umm don't all tranny do this? that is why when people install a shift kit, you get slammed into the seat, due to the instant gear change. most people don't want to feal the shifts.
No, only newer computer contoled units do this. I can only speak of chrysler and ford for sure on this, but I am sure other manufatures have similar programs too.
For example,Older hydraulic cntroled units, like say an A-413, when it shifts from say 1-2, it releases the first gear set of clutches/ bands, then engages the next set for second gear, but there is no overlap, but it is done qucikly enough that it doesn't feel that way. The electronic units, when doing the same 1-2 shift the trans will continue to hold/grab the first gear clutches/bands, while at the same time enageing the second gear cluthces/bands, then once those second gear parts were semi engaged, then the computer would disengage the first gear bands/ clutches, so there was an overlap.
The duration of overlap was longer in low rpm shifts, and shorter, or none, at high rpm shifts, causeing it to be quicker, and since the computer can vary line presure, or how hard it grabs the bands/clutches, it can make the higher rpm shifts more noticeable by grabing the bands/clutches more firmly with more pressure.
Like you said most people don't want to feel the shifts, and that is how chrysler attempted to solve the problem. The programing has been relaxed some, I don't think it is ass agressive about holding between gears as it used to be. They made some big program changes in the mid 90's
Shift Kits usually were meant for hydraulic contrled units, in order to make that firm shift, they increased line pressure which meant the bands/clutches engage harder, and usually a kit cause the shifts to be at a higher rpm, makeing that firm shift even more noticeable.
As for idle time, the harder you have been boosting recently, the onger I'd let it idle. If you have been driving gently for the last couple of miles, then probably not as long. If you just tried to set a new record on accelertation, then give it a little longer. I give my cars at least a minute, sometimes more.
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