Do I need to drain the coolant before pulling the old radiator?

Yes. Drain the system completely into a drain pan before disconnecting hoses. Catch any spills—old coolant should be disposed of properly, not poured down a drain.

Will the transmission cooler lines connect without adapters?

These are spec'd for manual transmission trucks, so the cooler ports align with manual trans line fittings. Double-check your existing line condition and fittings before install—replace any cracked or corroded lines while the radiator is out.

What's the return process if it doesn't fit?

Contact support with photos of your vehicle's radiator bay and transmission cooler line routing. Most fitment issues stem from aftermarket cooling components or non-original transmission coolers. ModSupply will work with you on a solution.