It may be possible that flushing the transmission fluid is your problem. Was the fluid really dark and had a slightly burnt smell to it? If the answer is yes, then you probably had an issue with the transmission and didn't know it and the particles suspended in the transmission fluid were what was giving it enough friction to make the shifts, by changing out the fluid you removed all the particles and now the transmission slips and won't shift into certain gears. Just a guess given the information you have provided. I would look at the transmission for the issue.
SOURCE: Chevrolet Malibu 2001 Transmission Flush or not
75,000 miles isnt alot of miles,unless they were mostly city miles. If you aren't experiencing any transmission problems,i would drop the pan,change the filter and whatever fluid the pan holds,and hold off on flushing the entire sytem.The clutches and bands sometimes don't do well when shocked with ALL new fluid that contains a certain amount of detergent.The only real problems i have seen with the total flush is on Dodge trucks of the 90's up to even 2000 and some later models,the transmissions use a governor pressure sensor,and solenoid,and i have seen many of them set codes after the flush,and the components having to be replaced with new.Black fluid isn't a good indicator.Brown fluid,is better than black.And red fluid is the best.
SOURCE: Re-filling tranny fluid in a 2005 Chevy Malibu
There should be a fill cap locate drivers side down on top the drive axle. Check your book or call auto parts store for capicity
SOURCE: surging power lose
a maf sensor will cause this also,you can go to any auto parts store and buy the maf sensor spray. follow directions on can. make sure air filter is clean also. my car did the same thing and after I cleaned the maf sensor it has been fine. 3.1 engine, to check sensor, just unplug it and try it on hills or highway. the car will not run very good and may stall out, but if the car does not surge, the maf is the problem.
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did you have the timing chain off? were there issues before the rebuild?
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