Transproblem :-(
 

Yesterday something happend with my transmission. :-(

Does anybody any info or thoughts??

It was icy condition and I started from an intersection in a turn. Suddenly I noticed that there was no forward Power and end the car slowed down to stop. It will not move in D and 3rd but it does in 1th and 2nd and R.

The car is an Trailblazer SS 2006 with 37.000 miles

I read on some forum that it maybe the front sprage that broke. I also read that the 4L60E trans (if thats the one in the car) dont like over 300 hp. Why have GM put that trans in a 400hp car?

I didnt launch it in any way when i happened. Is this common? If I had to remove and rebuild the trans maybe it wise to change to a stronger one...or???

I would appreciate input, ideas and tips here :-)

I am not the trans expert so maybe others will chime in, but...

Could be the Forward sprag, shift solenoids, 3/4 clutch pack etc.

Fluid level good?
Is the fluid burnt?
What color is the Fluid?

Fluid level was a little too high, light red and no burn smell at all.

I know on many FWD transmissions if the forward band snaps all you get 1-2 manual and no 3rd/Drive.

Its more lika RWD trans backed up with a transfercase for 4WD

The sprag took a dump very common on 4l60s time for a rebuild and upgrade to a borgwarner double caged sprag

Ok, can I be shure its a 4L60E in the car, I saw a note somewhere on a forum that it could be a 4L70E. Is there any major differences btw the two?

Same thing..except the 4l70 has 5 pinion planets and in most 4l70s they have 7 frictions in the 3/4 apposed to 6 in the 4l60..also most if not all 4l70s come with a double caged sprag but it has hard plastic not near as strong as a borgwarner