Yeah,I've had that happen while plowing,though I blew the trans or something "big!"...

..turned out the transfer case mount bolts were wicked loose and let it move when I rammed the snowbanks..
One day at my friends shop,a woman had a 2000 something Chevy pickup towed in--she said "the thing wont move in forward OR reverse--I think the transmission is junk,it has acted up before,my husband thought it was on its way out--how much to install a new one"?..
He quoted her $350,provided SHE got the transmission from whatever salvage yard,he didn't want to get involved in hassles if it turned out to be no good or didn't act right--she agreed,and a few days later a local salvage yard truck delivered a "low mileage good transmission",that costed her $500..
My friend installed it,I walked in his shop just as he was finishing up putting the transfer case back in,I helped him by holding it in place while he got a few bolts started...after it was all installed,fluids were filled,etc,he went to back the truck out of his shop bay,and....it wouldn't move..
He tried shifting to reverse,drive,nothing..then he had an idea,he reached down and went to move the transfer case shifter,and a loud gear grinding ensued!..he put the transmission in neutral,then shifted the transfer case into 2 hi,and it backed out fine!--then he went for a test ride,it shifted nice and he was satisfied it was a good transmission..then parked it,and called the customer,said your truck is ready,come & get it..
She got a ride to the shop,pays him,and gets in her truck and starts down the road..ten minutes later my friend gets a phone call--it was her--"I'm stuck at a gas station about a mile away--it wont move again!..you must have messed something up bad!"..
My friend said "I'll be right there--dont touch it!"..
He went there,gets in her truck,and sees the transfer case shifter is in neutral again!..he said "Here is your problem--you must have moved this shifter into neutral!"...
She looks and said "Oh my gawd,I put my purse handle around that thing,so it wont fall off and land on the floor"--she goes to show him,and just the weight of the purse and all the junk in it was enough to make the lever slide out of 2 hi ,and applying the brakes while moving probably made it go into neutral..
My friend assumed her original transmission was not "junk",and she didn't want it back,the salvage yard charged her a core charge,but she just paid it and said "you keep it,junk it,whatever"...
He ended up selling it to another friend for $100 "as-is",stating it "might" be junk and need a rebuild,but the guy put it in his truck and said the next time we saw him, "it seemed perfect to me!--lot better than my old one that burnt up and wouldn't even get me out of my driveway!"..
So she probably bought a trans for nothing ,threw $850 away,just because of her purse !..
