Dodge: transmission leak

i have a 93 dakota 4x4 318 with 180, miles on it great truck but the
transmission is leaking in front , one guy told me it was the front seal
he wanted $ 500 to fix it . i called a transmission man he said he would
fix it for $ 300 . i took it over to him i called him back in 2 days he
said it needs rebuilt it was building up pressure inside and blowing out
the vint on top . can that be that