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The 5R110W TorqShift is one of the tougher automatics Ford ever built. It ran behind the 6.0L and 6.4L Power Stroke in the 2003-2010 Super Duty trucks (and the 6.8L V10). Left alone with fresh fluid it will out-tow trucks with much fancier transmissions. The thing that kills a TorqShift is not a design flaw — it is neglected, cooked fluid and a plugged filter, especially on a truck that tows.
What makes this service different from a car ATF change is the volume and the layout. The 5R110W does not have a single pan drain. It has three drain plugs — the main pan, the fluid distributor sleeve area, and the torque converter has its own drain access — and the full system holds close to 18 quarts. That is why a proper TorqShift service costs more in fluid alone than most cars cost to service entirely.
Fluid Capacity & Spec
| Spec | Value |
|---|---|
| Fluid type | Mercon LV (later spec; earlier trucks called Mercon SP) |
| Full system capacity | ~17 - 18 qt (dry/complete) |
| Pan drop / partial change | ~7 - 8 qt |
| Drain plugs | 3 (main pan, distributor sleeve, converter) |
| Filter | Internal spin/screen filter — replace at service |
| Fill / level check | By fluid temperature at the check plug |
Get the fluid right. Modern 5R110W service uses Mercon LV. Early trucks were spec’d Mercon SP, which Ford superseded with LV. Do not pour in old Mercon V or a generic ATF — the friction characteristics are wrong and you will get shudder and harsh shifts.
Check Mercon LV fluid & 5R110W filters
The 3-Drain-Plug Procedure
The reason people pay a shop for this is that draining only the pan leaves more than half the old fluid in the converter and cooler lines. To actually change the fluid you work all three drains.
- 1. Warm the truck to normal operating temperature, then shut it down. Warm fluid drains cleaner and you need a known temp for the fill anyway.
- 2. Pull the main pan drain plug. This gets the pan fluid. Then drop the pan to reach the filter.
- 3. Remove and replace the internal filter. On the 5R110W this is the step most quick-lubes skip. A plugged filter starves the pump.
- 4. Drain the fluid distributor sleeve plug. This releases fluid trapped in the center support / distributor area.
- 5. Drain the torque converter. Rotate the flexplate to line up the converter drain plug through the access hole and drain it. This is what a pan-only change misses entirely.
- 6. Reinstall the pan with a new gasket, torque the plugs, and refill with fresh Mercon LV.
- 7. Set level by temperature. Run it through the gears, bring the fluid into the specified temp window, and check at the level plug. Overfill foams, underfill starves.
DIY vs Shop Cost
| Line Item | DIY | Independent Shop | Ford Dealer |
|---|---|---|---|
| Mercon LV fluid (~18 qt) | $120 - $180 | $160 - $240 | $220 - $320 |
| Filter + pan gasket kit | $25 - $60 | $40 - $90 | $70 - $130 |
| Labor (1.5 - 2.5 hrs) | $0 | $150 - $350 | $250 - $450 |
| Typical total (full 3-drain service) | $150 - $240 | $350 - $650 | $550 - $900 |
A pan-only “transmission service” for $120 at a chain shop is not a real TorqShift fluid change. If they did not touch the converter drain, they left half the old fluid in the truck. Ask specifically whether they drain the converter.
Service Interval — Especially If You Tow
Ford’s severe-duty schedule (towing, plowing, hot climates, heavy hauling) is far shorter than the normal-use number, and on a diesel Super Duty you are almost always in severe duty.
- Normal use: roughly every 60,000 miles.
- Towing / severe duty: every 30,000 miles, sometimes tighter if you run heavy in heat.
- After overheating: if you ever spiked trans temp towing a grade, change it soon regardless of mileage. Cooked fluid does not recover.
- Add a temp gauge. The single best upgrade for TorqShift longevity is knowing your pan and converter-out temps so you service before the fluid bakes.
Doing The TorqShift Service? Stock Up First
Do not start a 3-drain service one filter short. gearboxinsider.com carries 5R110W filters, pan gaskets, drain plug seals, and the Mercon LV to fill it. Same-day ship before 2pm Eastern so your truck is not stuck on stands overnight.
Shop Gearbox Insider →FAQ
Do I really need to drain the torque converter?
If you want a real fluid change, yes. The converter and cooler hold well over half the total capacity. Draining only the pan swaps maybe 7-8 of 18 quarts, so you are mixing mostly-old fluid back in. On a towing truck, do all three drains.
Mercon SP or Mercon LV — which one?
Use Mercon LV. Ford superseded the earlier Mercon SP with LV for the 5R110W, and LV is what is available and correct today. Do not substitute Mercon V or a universal ATF; the wrong friction spec causes shudder and harsh engagement.
How often on a truck that tows heavy?
Treat it as severe duty and service around every 30,000 miles, sooner if you have ever spiked the trans temperature on a long grade. Fluid is cheap next to a TorqShift rebuild, and this transmission rewards clean fluid with very long life.