transmision question on 1990 GMC 3500 Pickup

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what transmission came stock in a 1990 gmc dually 4x4
(1) Answer
(1) Comments
3 speed, the turbo 400 was an option.
overdrive is a 700 R4
use your vin and call the dealer parts and they will tell you.

thanks roy your info was helpful. iwent and purchased a 700r for it though already i was told it will work fine. will plugs all work though? meaning electrical plugs.