'05 Colorado owners

if its an 05, its still under warranty, take it in where you bought it and have it checked

Greetings,

My suggestions are many-fold:

What I would suggest doing first, however, is shifting the gear selector slower from Drive to Neutral to Reverse and see if that alleviates the issue. Many folks just slam the shifter from one drive gear to the other and expect instantaneous response - and it ain't gonna happen when you also have to wait or electronic valves and hydraulic pressure. You can try taking it to either the dealer or a reputable tranny shop and have them bump up the line pressure inside the tranny that shifts the gearset from Drive to Reverse. This is not really recommended - if it's even possible with the newer units - because it may cause hard shifting and just might invalidate your warranty. A few extra RPM while shifting (VERY few) could help, but that's not a habit I'd want to get into. If you really believe that this is a problem you could have a sluggish or sticky valve in the valve body causing a slow shift so maybe a dose of tranny fluid additive that supposedly loosens up internal valves could help (but no guarantees).

On the other hand, you mention that this issue happens before you can count to "3". I've been driving Chevy trucks since 1988 and have had a THM700R4, a 4L80E, and my current Allison 1000 and in all those years have never had a tranny that shifted from Drive to Reverse in less than 3 seconds, especially if I had even the slightest headway when I shifted. 3 seconds is resonable for this shift so I don't think the dealer will be much help since your tranny is most likely operating within parameters. Tranny's have much more electronics in them today than ever before and the shift timing in this case could actually be a programming issue. Try having the dealer reflash the tranny computer with the most updated software (or if you already have the most updated version, try a version slightly older than what you have).

However, in the end I don't see where a 3-second delay is a problem (and from how many times you've posted about this neither does your dealer), especially when reversing the tranny and backing uphill as you mention in other posts. Frankly, if there really is nothing wrong then I guess you're just going to have to learn to count to 3 and be patient.

Cheers - Jonathan