87-06 Wrangler TJ/YJ;GM V8;With transmission cooler;1 wide cores;100% TIG welded;Temperature sensor provision;Cross flow; California Residents: WARNING Our aluminum radiator with the 1 inch wide tubes and 16 fins per inch provides excellent heat dissipation. Our radiator uses a common 3/8 inch NPT fitting located in the cold side of the tank. This location provides for an accurate temperature reading of the fluid as it enters the engine. Our radiators are air tested a total of 3 times throughout the building process. Air can detect a leak before water. Our billet filler neck requires a standard GM overflow system style cap (3/4 inch depth). We recommend a 15 lbs. to 22 lbs. cap pressure. A higher pressure cap increases the boiling point. A higher pressure cap keeps the fluid in the cooling system, not the recovery tank. We use a cross flow design on our radiators to allow the radiator cap to be on the low-pressure side (cold side or water outlet) of the tank. Water drops in pressure as it is cooled; allowing recovered fluid back into the radiator during normal operation. On a down flow radiator, the top tank is always the hot side and is under constant pressure. Under sustained high RPM, this can force the fluid past the filler cap, out the overflow tube, and into the recovery tank even at normal operating temperatures. Our radiators use an aluminum angle for the mounting flange. This angle is TIG welded to the tanks. The aluminum angle has no mounting bolt holes. The customer determines the mounting pattern and location. This allows height adjustment for the radiator to center up to the water pump with the new engine location. This will also assist a desired height location if a body lift is to be installed.