6L80 Transmission Cooler, new and ready to install. Fits the 6L80. Ships fast from the USA.
If your 2007-2014 Chevrolet Silverado 1500 is leaving red drips under the front of the truck, the transmission fluid level keeps dropping, or a rusted line finally split while towing, this is the part you are looking for. Despite the short product name, this listing is a set of steel transmission cooler lines, not a cooler core: the front line assembly built for the 2007-2014 Silverado 1500 with the 6L80 six-speed, Fine Lines part TTC0702OM, made from Galfan-coated steel for corrosion resistance. It replaces GM numbers 15828750, 15908473, 25821881 and 25999419 and interchanges with aftermarket line 624-145.
The 6L80 makes most of its heat in the torque converter and in clutches as they apply. Hot fluid leaves the case through one line, runs forward to the cooler in the radiator tank and the auxiliary cooler, and comes back through the other line to lubricate the gear train. If a line leaks, kinks or rusts shut, the transmission either runs low on fluid or runs hot, and both kill a 6L80. Low fluid aerates the pump and starves clutch apply circuits. Heat breaks down the Dexron VI, and degraded fluid is the root of the converter shudder these units are known for. GM has even issued a bulletin on later 6L80-equipped trucks where a simply twisted cooler line caused harsh shifts, shudder, flare and high fluid temperature.
Clean the area and trace the leak from the highest wet point down; a radiator tank, pan gasket or case connector seal can look like a line leak. Inspect the full length of both lines for rust pitting, flattened bends and chafing. If the truck ran low, check the fluid condition and smell before blaming the line alone. Our 6L80 common problems guide explains how heat and low fluid lead to the shudder and clutch failures that follow, and the 6L80 pump failure guide covers the whine and pressure loss that low fluid causes.
This line set is listed for the 2007-2014 Chevrolet Silverado 1500 with the 6L80 transmission. GM routed cooler lines differently by body style, engine, cab and box length, and some trucks carry an auxiliary cooler while others do not, so match one of the GM numbers above to your old line or compare the bends and fittings before you install. The 2014 Silverado was a new body generation, so 2014 owners especially should confirm the part number. Send us your year and VIN if you want a fitment check. Every 6L80 part we carry is on the 6L80 parts page.
| Fits | 6L80 |
| Part type | Transmission Cooler |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
It is a set of steel transmission cooler lines, Fine Lines TTC0702OM, that run between the 6L80 and the cooler at the front of the truck. It is not a cooler core.
The 2007-2014 Chevrolet Silverado 1500 with the 6L80. Line routing varies by engine, cab, box and cooler option, so match GM 15828750, 15908473, 25821881 or 25999419 to your old line or send us your VIN.
Steel line sets are formed to the factory bends and these are Galfan coated to resist the rust that eats through original lines in salt-belt trucks.
Dexron VI automatic transmission fluid, which is the GM-specified fluid for these trucks. Set the level at operating temperature after the lines are installed.
If the transmission failed or was rebuilt, yes. Flush the radiator cooler and auxiliary cooler so metal and friction debris does not go back into the transmission. For a simple rusted line, a clean refill is usually enough.
