07 H3 Having trouble shifting from 2nd to 3rd 3rd to 4th

 

manual and auto?

 

It’s an automatic transmission just recently change fuse 133L 32 and mega fuse 125

 

The fuses were 13/32 and 125a mega

 

Are you having the problem both shifting manually and automatic? Shift points:

 

When I am driving first and second is OK but second to 3 and 3 to 4 the RPMs drive up

 

If you drive it off a cliff, the rpm's will eventually come down.

 

How many miles on it? When was the last time the transmission fluid and filter were changed?

 

Doc, you are like a broken record. This has always been an impressive site with a ton of information, however there seems to be a lot more spam today. There should be a requirement for new members: DO YOU OWN A HUMMER? If not, move on grasshopper.

My point, manually shifting vs auto is to rule out a possible electrical problem.
(first I always recommend to drive in 3 unless you are driving 55mph+)
Now to the op's issue, if you start driving in 1, then shift to 2 @15mph and it kicks in, then shift to 3 @25 and it kicks in, then there is a good chance that there is a fluid flow issue through the shift solenoids. Drop the pan, clean it out, change the filter, and install fresh dexVI.

 

Thank you Doc. And yes I do.