Alright so i own a 2003 Monte Carlo SS and it comes with the 4t65e transmission. Well i know that on certain ones the transmission 4th clutch hub was weak and could wear out. Well i got a parts list from a dealership for my car to see when it was made. It was made in October 2002. Well i know they didnt put the hardened shafts until 2003. Well on that same parts list for the transmission it says my transmission says "4T65E W/ OD Enhanced" now ive looked all over the internet and cant find what the "Enhanced" stands for and i checked the Monte Carlo forum as well so i figured my next best bet was to come here and ask all chevy owners if the knew. Any ideas guys? Thanks for any help!!
I'm pretty sure if it'* a 03 year model it has the hardened hub. I think what the enhanced your seeing is because in 03 they started using bosh solenoids instead of Holley solenoids in the 02 and earlier transmissions.
This website has a ton of info on the 4t65e No 4th Gear