How often should I change my transmission fluid/filter?

I bought a 4x4 truck that sat out in a field for 4 years and want to know if I should change the fluid and filter for transmission and if I should change the oil that is in the transfer case and the rear and front axles.How often should I change my transmission fluid/filter?yes I would change all the fluids in the engine, tranny, rearends, and also brake fluid.How often should I change my transmission fluid/filter?if it sat that long then i would definitely change the transmission fluid and filter along with the transfer case and rear end. it will be better in the long run to do so.How often should I change my transmission fluid/filter?Depends on your driving conditions. but once a year is fine. once every six months. even better!

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