700R4 Transmission Cooler 1988-94, new and ready to install. Fits the 700R4. Ships fast from the USA.
On a 1988-1994 Chevrolet or GMC C1500 or C2500 pickup, the transmission cooler lines run the full length of the frame rail from the 700R4 to the radiator, and thirty years of road salt is usually what finally gets them. This is a two-piece set of preformed replacement cooler lines for 1988-94 GM 2WD trucks with the 700R4, matching the Inline Tube CTT8801 set: 5/16 inch tubing in OE-style steel, bent to factory routing with the fittings and flares installed. If you are chasing a drip under a GMT400 2WD truck, this is the part that fixes it.
This is a line set, not an add-on cooler. It connects the transmission to the cooler tank inside the factory radiator.
Hot fluid leaves the transmission through the converter circuit, travels forward to the radiator cooler, and comes back through the return line into the lube circuit. That return oil is what feeds the bushings, planetaries and output, so a restricted line does more than run the fluid hot; it also cuts lubrication. On a half-ton or three-quarter-ton truck that tows or hauls, the cooler circuit is working hard, and a pinhole or a flattened section shows up quickly as a falling fluid level or overheated fluid.
Wash the frame rail, run the engine in Drive with the brake held, and trace the wet spot to its highest point. A leak at the radiator or case connector may only need the fitting resealed; a weeping or crushed tube means replacing the lines. If the truck has already been driven with the level low, the 700R4 pump failure guide explains what to listen and look for, since a starved pump is the usual next casualty. The 700R4 cooler line replacement guide covers removal and install step by step.
Listed for 1988-1994 Chevrolet and GMC C1500 and C2500 2WD trucks with the 700R4, two pieces in 5/16 inch tubing, gas engines. Several variations matter here. The 454 SS pickup uses a different line set. 4WD K-series trucks use different routing; we carry a separate 1988-1994 4WD cooler line set. GM renamed the hydraulic 700R4 the 4L60 in 1990, and the electronic 4L60E replaced it in these trucks during the run, so if yours has a 4L60E or an auxiliary cooler, compare the ends and bends against your old lines first. When in doubt send us your year and VIN. More parts for this unit are on the 700R4 parts page.
If the fluid came out burnt, plan on more than lines. A worn pump is common on high-mile GMT400 trucks; our 700R4 pump and 1987-1993 overhaul kit cover the rebuild.
| Fits | 700R4 1988-94 |
| Part type | Transmission Cooler |
| Condition | New |
| Brand | OEM |
| Reference | C1500 |
| Ships | From the USA |
| Warranty | 1-year |
No. This set is listed for 2WD C1500 and C2500 trucks. The 4WD trucks use different routing and need the 4WD line set.
No. The 454 SS truck uses its own line set, so this one is not listed for it.
The set is listed for 1988-94 2WD trucks with the 700R4. Compare the fittings and bends with your old lines before installing, or send us your VIN and we will check it.
It is a two-piece set of 5/16 inch steel lines that connect the transmission to the cooler in the factory radiator. No separate cooler is included.
No. The set is listed for gas-engine trucks only. For a diesel truck, match your old lines or send us your VIN so we can check what fits.
