Hey there, I got a 2010 Silverado, 4.8 ltr, 4x4, automatic, 4L60E, I bought the truck used, it had patched cooler lines and low fluid, I changed the fluid all was well until I waited to long to change the cooler lines, needless to say trans reached 140, lost all the fluid and all gears, changed the cooler lines on the side of the road, new fluid, all was well for 4-5k km, at this point my luck struck again, the aux trans cooler blew, again lost all fluid and this time I caught it before trans made it over 110, fixed it, ran good for another few thousand kilometres, then lost 4th gear, drove with 3rd for maybe 100km and now have lost 3rd as well, reverse is fine, 1st and second seem fine aswell, with out scanning ( I just had my first son and moneys extremely tight right now, shop rates 115/hr to have it scanned alone ), would one assume it’s more likely the sprag, the 3-4 clutches, or a shift solenoid, I have a some experience with 4L60e’s from a previous trans tech apprenticeship, just would like some others input before I pull it out and order the rebuild kit, any input is greatly appreciated, cheers, Korybill!

 

Band

3-4 clutch

Can't be any of those other things... they either aren't involved in both failures, or can't fail in only one gear and then later in another

Congrats on the son, sorry about the money, it is what it is

 

Yep. Time for a rebuild.

 

thanks for the reply! I’ll order a master rebuild kit! Also do you recommend replacing the torque converter as well? I’ve watched some videos and I’m confident enough to take on rebuilding it myself!