Hard shifts

Ok, I typically take it easy on the truck until it’s warmed up. I always notice when it’s cold that the transmission shifts firmly for the first few 1-2nd 2-3rd shift cycles. (I actually like the way it feels and wish it always shifted like that).

Well yesterday I couldn’t help myself about a half mile out from home. I pull up to a light and notice a guy pull to my right at the light. He’s in the far right lane that immediately merges after the intersection. I call it “The Rifling lane”. I have my nannies turned off. The light turns and I pedal it against my better judgment to about half throttle. As I cross the concrete intersection it chirps the 1-2nd shift!
It sounded bad ass along with my BAMuffler!

It reminded me of my 64 olds with a turbo 350 and a shift kit. As well as my tuned SS trailblazer.

Obviously I need to contain myself which 99.9% of the time I do. Im just wondering if anyone else has a very firm shift in their trucks when cold? Nothing out of control, but firm.
Im hoping I don’t have a problem with my valve-body. I have noticed on occasion with beast mode engaged that at about 1/2-3/4 throttle the truck will occasionally have a weird 1-2 shift. Kinda slip bang or torque converter lock, unlock, shift, kind of feeling. Hard to explain, and it doesn’t always do it. Im not to worried but thought I’d share. Any input?

 

Mine shifts pretty firm when first warming up as well. After warmed up it shifts almost like a manual trans, slight hesitation then the solid engagement. I noticed when it was real cold out both my Tundra and my wife's Camry would go into "neutral" on the 1-2 upshift on the first shift out of the gate then all was normal. Found it odd but my Tacoma did the same and I've had fluid levels checked on all 3.

 

It probably shifts a little firmer until the transmission fluid warms up some and get thinner. The cold (and thicker) fluid may increase the line pressure a little.

 

Kind of what I figured. Most automatics I’ve driven do this to some degree. I was just surprised it gave me a tire chirp.

 

You can always keep your foot out of it to prevent tire chirps.

 

Yeah it’s not my typical driving style when the trucks cold haha

 

I have yet to spin the tires on my truck, I got on it once or twice just to see what the 5.7 can do; I was pretty impressed.

Things are a little different when I drive my Chevelle, it will chirp the tires on the 2/3 shift. Somehow when I turn the engine on it automatically turns off my common sense. My wife refuses to drive with me after I showed her what the car can do.....she yelled at me and called me an idiot.

 

What year Chevelle ??

 

I have noticed the exact same "hard" shift when cold....Goes away as she warms up......I take it easy until it's warm

 

1969, ZZ454HO crate engine, EFI, 4-speed auto, 9" Ford with 4.11's and loves lots of 93 octane gas.