The MoTech GM 5.3 aluminum-block V-8 weighs the same as the Jeep 3.8 iron-block V-6, so there are no spring sag issues. The installation looks OE. MoTech usually uses the Jeep 3.8 V-6 radiator with their 5.3 installations, but we chose to upgrade with their aluminum radiator used in their 6.2 V-8 swaps. Where we wheel, it gets hot. TrailRunner never does. An Odyssey sealed battery stores 12V power safely.