About what speed should my trans kick down to first gear when floored. Does 20 mph sound right or should it be higher.
Thanks
Dave
02 Silverado Ext. 4.8 Auto 4X4, K&N,Superchip,Flowmaster

 

mine will drop into 1st as high as 30+/-mph at WOT. It used to kickdown at 35 .. not sure what happened but now it likes 30 .... go figure.

 

depends on your gearing. for example, i have 2.73's so it'll kick down at 35mph no problem. if i had a 3.23 car and hit it at 35mph, i believe it would downshift into 2nd.

you could do two things:

-give us your gear ratio and we can guess.

or the method i recommend:

-try it yourself for each individual mph - so much more fun

 

Yes, gear dependent MPH-points but all set by the
part throttle shift tables, which suck from factory.
The stock plan is no kickdown-1 below 10MPH except
WOT 31MPH (3.23s). You can do much, much better
for street / course driving.

 

My trans will not kick down to first gear until about 20 MPH, which seems a little low. I thought it used to kick down about 30 MPH, but I not sure. Truck does have a 3.73 rear. Truck runs good, just had fluid changed, old fluid look good.
Thanks
Dave
02 Silverdo Ext. 4X4,4.8,3.73,Flowmaster,K&N,Superchip used only when towing camper.