transmission

Transmission Oil Cooler

for 2002 Dodge Viper 8.0L V10 · RWD

Difficulty

Moderate

Time

2.0 h

Tools

Steps

🔧Does this apply to your car? On most cars the transmission cooler is built into the radiator side tank, not a separate part — this job most likely doesn't apply to your vehicle (cooler service happens with radiator replacement). Standalone auxiliary coolers are typically found on trucks, vans, and vehicles with a tow package.

✓Fact-checked. Built from OLP's spec database, then independently fact-checked line by line with every correction applied. Master-tech sign-off by Chris Hackleman is queued. Cross-check torque values against the factory manual, and stop if anything looks unsafe. How our data is made.

Replace the transmission oil cooler assembly on a 1992 Dodge Viper V10, including disconnecting cooler lines, removing the failed cooler from its mounting location, and installing a new unit with fresh transmission fluid.

Warnings

⚠Transmission fluid will drain from cooler lines when disconnected. Have drain pan positioned to catch fluid immediately.

⚠If vehicle was recently driven, transmission fluid and cooler may be hot enough to cause burns. Allow to cool for at least 30 minutes.

ℹ️The 1992 Viper uses a manual transmission (6-speed Tremec) but the oil cooler serves the rear differential fluid routed through a heat exchanger. Some fluid loss is normal during this procedure.

Tools required

Floor jack and jack standsEssential

Wheel chocksEssential

Drain pan (minimum 6 quart capacity)Essential

Line wrench set (3/8" and 1/2")Essential

Socket set (metric)Essential

Torque wrench (10-70 Nm range)Essential

Shop ragsEssential

Wire brush

Transmission line plug set

Funnel with long flexible spoutEssential

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Parts

Transmission oil cooler assembly × 1 — Use OEM specification
Transmission cooler line O-rings × 2 — Use OEM specification
Transmission fluid (ATF+3) × 1 — Mopar ATF+3 or equivalent

As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.

Fluids

transmission_manual — 1.5 qt

Preparation

Park vehicle on level surface and apply parking brake
Place wheel chocks behind rear wheels
Allow engine and drivetrain to cool if recently operated
Raise front of vehicle with floor jack and support on jack stands at manufacturer-specified lift points
Locate transmission oil cooler (mounted in front of radiator on driver's side of grille opening)

Procedure

1
Access the transmission oil cooler
From under the vehicle, locate the transmission oil cooler mounted in front of the radiator assembly on the driver's side. The cooler is a small heat exchanger with two lines running to it. Note the routing of the cooler lines for reinstallation reference.
2
Drain transmission cooler lines
Position drain pan beneath the transmission oil cooler and cooler lines. Using a line wrench, carefully loosen the inlet line fitting at the cooler (lower connection). Allow fluid to drain into pan. Once flow stops, loosen the outlet line fitting (upper connection) and drain remaining fluid. If available, install transmission line plugs to minimize additional fluid loss from the lines.
3
Disconnect cooler lines from cooler
Using the appropriate line wrench, fully disconnect both transmission cooler lines from the oil cooler assembly. The fittings are threaded connections with O-ring seals. Cap or plug the open line ends to prevent contamination. Inspect the line ends for damage or excessive wear.
4
Remove oil cooler mounting hardware
Locate and remove the 2 mounting bolts securing the transmission oil cooler to its bracket. The cooler is mounted with two bolts through rubber isolators. Support the cooler while removing the final fastener to prevent it from falling.
Torque spec
Mounting Bolts27 Nm (20 lb-ft)
5
Remove transmission oil cooler assembly
Carefully lower the oil cooler assembly away from its mounting location. Tilt as needed to clear any obstructions. Inspect the mounting bracket and isolators for damage or deterioration; replace rubber isolators if cracked or compressed.
6
Prepare new oil cooler for installation
Remove the new transmission oil cooler from packaging and verify it matches the original unit in dimensions and fitting locations. Install new O-rings on both inlet and outlet fittings, lubricating lightly with clean transmission fluid. Do not reuse old O-rings.
7
Install new transmission oil cooler
Position the new oil cooler into the mounting bracket, aligning the mounting holes with the bracket. Ensure rubber isolators are properly seated. Install both mounting bolts finger-tight initially, then torque to specification in a criss-cross pattern to ensure even pressure on the isolators.
Torque spec
Mounting Bolts27 Nm (20 lb-ft)
8
Reconnect transmission cooler lines
Remove plugs from cooler lines. Verify new O-rings are in place on cooler fittings. Thread both cooler line fittings onto the new cooler by hand to ensure proper engagement and prevent cross-threading. Using a line wrench, tighten the inlet line (lower connection) first, then the outlet line (upper connection). Tighten fittings firmly but do not overtighten as this may damage the O-ring seals or aluminum fittings.
9
Refill transmission fluid
Lower vehicle from jack stands. Refill the fluid for the circuit served by the cooler (verify whether the heat exchanger serves the manual transmission or the rear differential on this vehicle). Add the correct OEM-specified fluid to replace what was lost during cooler line disconnection, filling until level with the bottom of the fill hole. Reinstall fill plug and torque to specification. The fill level should be even with the bottom of the fill hole. Reinstall fill plug and torque to specification.
Torque spec
Fill Plug34 Nm (25 lb-ft)
10
Check for leaks and verify operation
Start the engine and allow it to idle for 2-3 minutes. Visually inspect all cooler line connections at the new oil cooler for signs of leakage. Shut off engine and raise vehicle to inspect underneath. Check connections again while accessible. Take vehicle for a short test drive (5-10 minutes), then recheck all connections for leaks with the system at operating temperature. Top off transmission fluid if necessary after test drive.

Reassembly

Ensure all cooler line connections are torqued properly and not leaking
Verify transmission fluid level is correct after test drive
Inspect area under vehicle for any fluid drips after 24 hours of normal operation

Verification

No transmission fluid leaks visible at cooler line connections
Transmission shifts normally through all gears without slipping or unusual noise
Transmission fluid level is at proper fill level (even with bottom of fill hole)
Oil cooler is securely mounted with no excessive vibration or movement