tired of my transmission

[mexlokote]

I have an 82 c10 custom deluxe and has original engine with original trans
Its an inline 6 250 with a thm350 automatic trans
And i been having a leak for months from the oil pan gasket and from the driveshaft
Seal, it has new driveshaft seal and still has leak, also i have changed a cleaned really good the oil pan and after 5 times changing the gasket still leaks i used all types of gakets
Im getting tired loosing oil and time and money,
What i want to know is whats my best trans i could swap, and on which car or truck i can get it out from
Or does anyone have a solution?
Thanks
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