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Sorry to hear that you are down in the dumps about your truck. I think I would just go with the same transmission. I think it would do a good job for what you use the truck for... A truck..
Any good shampoo should get the diesel out or you could use what my grandpa always used to get axle grease out of his hair, hog manure.. It doesn't really get the grease out but nobody will get close enough to you to be able to tell there is anything there...
Good luck with your truck.
LockDoc