i'm thinking of upgrading from the 4L60e to 4L65e or 4L80e will it be wirth it need feed back????. y you may ask well i've  gone throw 2 of the 4L60e???    smashing & more smashing/burnouts/8/0 so what do you think the 4L60e is good transmission but i don't now why thay bust  .  

If you want a good selection id try a parts locator. One place that can find you a good short or long block for a <a href="http://www.texas-junkyards.com">Used chevrolet transmission</a> is <a href=http://www.texas-junkyards.com>TEXAS Junkyards</a>, Junk Yards in TEXAS TX salvage recycler. They have a link somehow to multiples of thousands of recycling centers and will locate the best one for you.  

If you want a good selection id try a parts locator. One place that can find you a good short or long block for a Audi A4 engine is TEXAS Junkyards, Junk Yards in TEXAS TX salvage recycler. They have a link somehow to multiples of thousands of recycling centers and will locate the best one for you.  

the 4l65 is just a heavy duty 4l60 it has a 500 lb higher capacity than the 4l60. as for the 4l85 it is a very heavy duty transmission however converting to it requires a shorter drive shaft and a different computer. the 4l60 is a great transmission and if properly beefed up can take quite a lot of abuse.  

hay thank you for the input. i did some work on my 4L60E more like Rebuild it. the transmission was runing very X 10 GOOD from 7/22/08 -  9/26/08 that's 1,600 mil. In the transmission tear down i'll see what the *** happend
I have 1-2 very good power but 3-4 is as if in (neutral) and ya the 4L60E "can take a lot of abuse" that's y i am keeping the GM 4L60E transmission for my 1997 camaro SS  

***********************_update_************************                                                       ok?? i have removed the transmission and in the TEARDOWN I CAN'T FIND ENY THING WRONG   !!!                                (1)  valve body seems ok.------------------------->(2)  associated wiring & solenoid  i have to test them out.---------------------------------------------->(3)  the separator plate and gasket are new. no heat damge(only 1,600 mil)----------------------------->(4)  2nd  and 4th Apply super Servo checks good. the new intermediate (ALTO POWER) band and the new reverse input drum is fine on damge.----------------------->(5)  revers input, forward, overrun, 3,4 ,low and reverse clutch packs are like now no heat damge. low and reverse apply piston checks good. (only 1,600 mil). ------------------------------------>(6) hard parts, planets, sprag, thrust bearings, gears,seals, bushings and rings  all ass like new.
                                                       as you can read i have all ready f**U*              ok i'm geasing it's a wiring or pcm problem i welcome all info.?? HELP.