Is there an upgraded tranny for the trailblazer? When climbing a hill the rpms jump up about 300 rpms. Is that the TC locking up or am I wrong in thinking that the trans ia a 3 speed w/overdrive. New to this platform and not real sure exactly what they are and what was available from the factory
tranny mods
- Thread starter leffty
- Start date
RayVoy
Member
- Nov 20, 2011
- 939
When asking a technical question, filling out the profile with vehicle information is always helpful. 
You did say trailblazer, so I am going with the assumption that you have a 2002, or newer, with an in-line 6 motor.
These trucks have a 4 speed transmission (the 4th being an over-drive).
I suspect the increase in rpm, that you are seeing, is the transmission downshifting into 3rd gear, if the rpms go down when you reach the top of the hill, the transmission is up-shifting into 4th.
You did say trailblazer, so I am going with the assumption that you have a 2002, or newer, with an in-line 6 motor.
These trucks have a 4 speed transmission (the 4th being an over-drive).
I suspect the increase in rpm, that you are seeing, is the transmission downshifting into 3rd gear, if the rpms go down when you reach the top of the hill, the transmission is up-shifting into 4th.
Its an 04 I6 with 373 gears. At hyw speed on a hill it drops about 300 rpms or so when just trying to maintain speed. Its not a hard or contant rise in rpms it kinda floats for a lack of a better word. I can then drop the trans into third and it down shifts then around 500 rpms