can a lift kit cause problems to the transmission overdrive if load is to heavy?

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We picked up a 2005 dodge 3500 that was broken down. The truck had fluid running out from underneath it. The fluid smelled burnt. We later determined the overdrive case was cracked which caused it to lose all the fluid. We replaced the overdrive and the main cooler line. refreshed the transmission then we inspected the truck futher to find the carrier bearing and the front u joint were bad. Those were replaced. Because of the lift the drive shaft was not setting level. Because of the heavy maybe to heavy loads this truck was pulling. We advised the people to take the lift kit off and go back to factory equipment.