I dont really know if this will be an extensive answer or not, but any advice or general direction will be greatly apperciated. I have a 1995 caddilac deville, i prolly dont have to say it but for simplicitys sake it has the 4t60e transmission. I had previously had a problem with overheating but a complete overhaul of the cooling system , set it back running to 190-207 at the highest. During that process i replaced the radiator and with that a portion of the transmission fluid was lost during repair. I have had no problems with the transmission, its a new engine that i learned i was takin for but no worries live and learn. It has around 25,000 miles on it. Before the overheating problem was fixed , as said before no problems with transmission ran exatcly how it should. Only after i got the new radiator in and refilled the antifreeze, i started the car and idled it drove around the block 1/8th of a mile, and was 4.5 quarts low on transmission fluid, i added the dextron 4, uses 3 but mech said it was back compatible , i smelled a burnt toast kind of smell, i figured this was because of low fluid and immediately turned the car off and filled it with 3 quarts, waited for 20 minutes and JUST idled it and refilled as was needed. Manged to get it perfectly ttopped off after shifting through all the gears several times. i drove it a round with no problems, shifted smooth, no delay, and after 5 miles i hit the gas hard to test it out and it shifted through all 4 gears without a hiccop. I know somthing could have gone very wrong but thankfully nothing did, i only thought that through after. But to my dismay the reverse did not want to kick in gear. At idle reverse rmp it seems to want to crawl backwards for a few feet close to 4mph, but with incresed rpm reverse power is lost. afraid i might have grinded the gears when i smelled the burning, ( reverse was not working before this, directly after fluid loss from radiator change) I dropped the transmission pan and inspected color and the magnet. transmission fluid is still very red no blackness, im good with fluids , its in no urgent need of a full flush and service but while im at it i will have it done. The magnet was clear of large chunks of metal , but instead had the equivalent( best way i can explain) was if you ashed a ciggerate 2-3 times and squished the pile with your finger, in really fine metal fillaments. I passed a magnet over the one in the transmission pan and they stuck up. There was not an abundance of them but was enough to see. i replaced the filter and gasket cleaned the magnet , and put it back together, was able to catch all of the transfluid in the pan despite a few drops, then refilled it, again all foward drive and acceleration id great. Plus in reverse there seems to be a low idle condition, normal, like 6-750 rpm. So at last my question is could i have shot my transmission? Im not sure but i do belive any sign of metal no matter how small is not a good thing. Is this a rebuild or am i missing somthing obvious? While i would like to belive my transmission is not shot reguardless of how it worked before the radiator change, i am looking at the sad fate of the car at this point, is there anything that can be done , or am i looking at major repairs? I know this was alot of words but, info is key around here. If anybody could chime in it would be a HUGE help.