Anyone know of any preventative maintenance I should do while I have the whole engine out? I'm swapping in a whole new long block into a 2004 discovery with 90k.

already have a new waterpump and thermostat going in plus new manifold, oil pan gaskets and what not.

DiscoMike suggested a front transmission seal? I forget if that's what its called. Thanks

 

When I replaced my engine with a used unit, I replaced the valve cover gaskets, rear main seal, and transmission front pump seal (the seal behind the torque converter). The only seal I didn't replace was the timing cover seal because it was bone dry on the replacement engine. It is now seeping.

 

Depending on the mileage of your truck, new motor mounts, hoses, belt and change your power steering fluid.