Hey guys
I just rebuilt the 4l60e in my 98 Suburban. I installed the Transgo shift kit and used the master rebuild kit from Dacco and a new torque converter. I also cleaned out the cooler and lines with the can from Dacco and blew them out afterwards with compressed air.
The trans shifted perfectly smooth for about 100 miles and then all of a sudden, 3rd and 4th was gone. It does try to shift to 3rd but just slips completely. I have pulled the pan back off and their is quite a bit of greyish black sediment but does'nt look like enough material for the 3-4 clutches to be burned up enough to totally slip. Also, the fluid is still the correct color and does'nt smell burnt.
All the new clutches went back exactly as the old ones came out and I measured all the clearances like the ATSG manual said to and was all well.
Could the 3-4 pack have burned up that quickly and what could have been the cause?