95 Camaro Shifting Issues

Check to see if you get a full clutch engagement, it may not be. You could have a worn syncro on 1st &2nd this cold also be a worn shifter or linkage.

Normally to replace the syncros is a trans rebuild which is exspensive. You can go to a junkyard and see if they have a trans, you can usually find one at a junkyard with reasonably low mileage or so. But make sure to check your clutch for proper adjustment as well as working correctly. You may have an issue like a bent release arm or the hydraulics isn't pushing the clutch all theway to disengage. I'd really have the clutch checked first as reverse doesn't have a syncro and it sounds like that the clutch may be your problem. Or the linkage for shifting is completely worn out.

Athump in the rear can be alot of things, it can be a loosesuspension part or the driveshaft hitting the floor due to weak springs. When you just said they had to put 4 different ones in to get he right clutch, that leads me to beleive that they could have the incorrect one in there. Or there is a part that isn't operating correctly with it. Your best thing here is to have aprocheck this car out by inspection and give him all the problems youare having with it. Make sure he checks all the fluids as well as you may be low on some. Gears normally shouldn't "pop" when added weight is put to a vehicle nor shoud it sound like something hitting the floor. You could have a bad shock or strut in the rear causing this. SAVE yourself some money and have a pro check this, then you will really find what you are up against and have it corrected. Popping out of gear in a trans is an indication of soemthing worn in the trans and usually those things have to be removed and tron apart for any real diagnosis.