700R4 Transmission Cooler 1985-88, new and ready to install. Fits the 700R4. Ships fast from the USA.
A G-body that has sat for decades usually has cooler lines that are rusted through at the frame clips or kinked where someone jacked on them. On a 1985-1988 Chevrolet Monte Carlo SS, that leak drips onto the exhaust and slowly drains the transmission. This listing is a two-piece set of preformed transmission cooler lines for the 1985-88 Monte Carlo SS with the 200-4R or a 700R4. It matches the Inline Tube CMT8102 set: 5/16 inch tubing in OE-style steel, bent to the factory routing, with the fittings and flares already on the ends.
Note that this is a line set, not a separate radiator or stacked-plate cooler. It connects the transmission to the cooler tank built into the factory radiator.
Fluid heated by the converter leaves the transmission through one line, runs forward to the cooler in the radiator tank, and comes back through the second line into the lube circuit that oils the bushings, gearsets and output. On these overdrive units the converter clutch and the overdrive gear help keep heat down at cruise, but towing, stop-and-go traffic or a looser stall converter still put a lot of heat into the fluid. A line that is leaking, flattened or partly blocked either loses fluid or cuts the flow that carries heat away, and both shorten the life of the clutches and the pump.
Clean the lines and the fittings, run the engine, and watch with the selector in Drive and the brake held; the lines carry pressure with the engine running. Check that the leak is not coming from the fittings at the radiator or the case, since a fitting may only need resealing. If the tubing itself is weeping or the lines are crushed, replace both pieces together. If the car has been driven low on fluid, read our delayed engagement guide and the 700R4 pump failure guide, because running low can starve the pump before the leak is ever found. Our 700R4 cooler line replacement guide walks through the job.
Listed for the 1985-1988 Chevrolet Monte Carlo SS with a 200-4R or 700R4, 5/16 inch lines, two pieces. The Monte Carlo SS was built with the 200-4R, and the same set is listed for cars that have since been converted to a 700R4. A conversion can move things around, so compare the new lines with your old ones before you start: tube size, the fitting at the case, and the bends near the transmission. This set is for the factory radiator and factory routing; if your car has an aftermarket radiator or an added cooler, the ends may not line up. If in doubt, send us your year and VIN or a photo of your old lines. Other parts for this transmission are on the 700R4 parts page.
If the 200-4R is worn out and you are swapping in a 700R4 at the same time, the swap also needs a correct TV cable such as the Lokar KD-2700HT kit, and a fresh unit can start from our 700R4 overhaul kit.
| Fits | 700R4 1985-88 |
| Part type | Transmission Cooler |
| Condition | New |
| Brand | OEM |
| Ships | From the USA |
| Warranty | 1-year |
It is a two-piece set of steel cooler lines that run between the transmission and the cooler built into the factory radiator. It does not include a separate cooler.
The set is listed for 1985-88 Monte Carlo SS cars with either the 200-4R or a 700R4. Compare the fittings and bends with your old lines before installing, since swaps are not always done the same way.
The lines are 5/16 inch tubing in OE-style steel, which is the size listed for this application.
The set is listed for the SS. Other Monte Carlo trims can use different engines and routing, so match against your old lines or send us your VIN before ordering.
Dexron ATF. A current Dexron-VI fluid meets the older Dexron specs these transmissions were built with.
