How the 2006 Eclipse Manual Shifter Actually Feels
The shifter has a solid throw, but it's not perfectly precise from the factory. The bushings in the linkage are rubber and they soften over time. After about 80,000 miles, you'll notice the gate becoming vague, especially when the transmission is cold. That's normal. The shift action is short, maybe 3 inches top to bottom, and the lateral movement is tight. It's not as crisp as a Miata or a Z, but it's adequate if everything is healthy. I replaced the shifter bushings on my own Eclipse a while back. The OEM parts are a pain to get to because you have to drop the lower splash shield and reach up from underneath. I ended up just swapping to poly bushings from a specialty shop, and the throw became noticeably sharper. The difference wasn't massive but it was there. The factory setup was always going to be a little loose, that's just Mitsubishi's budget engineering.
2006 Mitsubishi Eclipse Manual Transmission Maintenance
The gear oil is the first thing you should worry about. The factory fill is 75W-90 GL-4. Yes, GL-4, not GL-5. Using GL-5 will attack the brass synchronizer rings inside the transmission. It happens slowly, maybe over a few years, but you will feel it when the shifter gets notchy and gears start to grind on their own. The capacity is roughly 2.1 liters for the four-cylinder version. Drain plug is a 14mm socket. Fill plug is usually the one you struggle with, often located on the side of the case where access is tight. I had a situation where second gear would grind when shifting from third on a cold morning. The car was at about 42,000 miles and the oil had never been changed. The previous owner assumed factory fill meant permanent fill. I drained it, found the fluid was dark and smelled slightly burnt, and flushed it three times with fresh GL-4. The grinding went away almost immediately. A simple fluid change fixed what looked like a synchronizer problem. The clutch master cylinder is another weak point. It's mounted on the firewall inside the engine bay, and the seal on the piston degrades over time. You'll see fluid weeping from the bellhousing vent hole, or the pedal will sink slowly to the floor. The part costs about forty dollars at any auto parts store. Replacement takes about forty-five minutes if you have a good set of lines and a helper to bleed it. The tricky part is bleeding because air likes to get trapped in the line. I use a one-man bleeder kit and go slow, which usually gets it done in about twenty minutes.
Common Problems That Catch People Off Guard
The reverse lockout mechanism is one thing. You have to lift the ring around the knob to engage reverse, and the detent spring inside the shifter assembly can weaken. When that happens, you can accidentally shift into reverse without lifting the ring. It's not dangerous per se, but it's annoying. The fix is replacing the shifter assembly or just installing a stiffer spring from an aftermarket source. The differential fluid on the AWD models gets neglected constantly. The rear differential uses the same 75W-90 GL-4 specification. If you skip it, the gears will whine and eventually the bearings will fail. The fill capacity is about 0.8 liters. The fill plug is on the top of the housing and it's easily stripped if you're not careful. Use a proper socket, not an impact bit. Another issue is the throwout bearing. When it starts to fail, you'll hear a whining noise that changes with engine RPM but stays constant regardless of whether the clutch is pressed or released. That's different from the clutch release bearing failure sound, which goes away when you press the pedal. The throwout bearing is integrated into the pilot bearing assembly in the bellhousing, so replacing it means pulling the transmission. Budget four to six hours of labor if you're doing it yourself. The part itself runs about eighty dollars.
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Clutch Replacement Notes
If you're replacing the clutch, buy a full kit. The pressure plate, disc, and release bearing should all go in together. I've seen people skip the release bearing to save money, and they're back in the shop within a year. The flywheel surface matters too. If it's scored or hot-spotted from an old clutch, resurface it or replace it. A rough flywheel will chatter and vibrate even with a brand-new clutch disc. The dual-mass flywheel is not used on this application. It's a single mass unit, which is simpler and cheaper to replace. That's one advantage over some European cars. The torque converter bolts to the flexplate, so you don't have to worry about separating a clutch assembly from the engine in the same way you would on a different platform.
Shifting Technique That Helps
The transmission doesn't like being forced. If a gear won't go in, you're probably riding the clutch or not letting the synchronizers do their job. Lift off the throttle briefly, shift to neutral, let the revs match, then engage the next gear. It takes practice, but it saves your synchronizers. Forcing a gear that won't catch is how people end up with cracked shift forks. That's a transmission-off-the-car repair. The synchro rings are made of brass. They wear down over time, especially first and second gear since those see the most use. When they're gone, the gears will grind under load. There's no repair for that except replacing the entire gear set or swapping in a remanufactured core. The good news is that for normal street driving, these transmissions last well over 150,000 miles with basic maintenance.
Where to Find Parts
EagleMotive.com carries a solid selection of Eclipse parts, including transmission components. RockAuto has the basic stuff at reasonable prices if you just need a clutch kit or a fluid change. For exotic items like a replacement synchronizer ring or a worn shift rail, you might need to check a Junkyard.org listing to find a donor transmission from a wrecked Eclipse. Make sure the donor is from the same engine configuration, since the bellhousing bolt pattern and input shaft length differ between the four-cylinder and V6 models. The four-cylinder input shaft is shorter than the V6 version. If you're swapping a transmission between engines, verify the length. A wrong match will cause the clutch disc to sit too far in or too far out, and the release bearing won't engage properly.
Limits of This Setup
The manual transmission in this car is fine for daily driving and moderate performance use. It's not built for high-horsepower applications. If you're putting more than 250 wheel horsepower through the clutch, expect the stock friction material to glaze over quickly. An aftermarket clutch from a reputable brand like Exedy or Spec will handle that kind of power and cost maybe two hundred fifty dollars installed. The stock clutch will slip under those conditions, and once it slips, you're looking at a whole new repair bill. Also worth noting: the shifter cable can stretch slightly over time, making the throws a little longer. This is more noticeable in winter when the rubber bushings contract. The fix is adjusting the cable tension at the transmission end, which has a locknut and threaded adjuster. A quarter turn can make a meaningful difference. If you're buying one of these cars, check the clutch height before you commit. With the engine off, press the pedal by hand. It should have about an inch of free travel before you feel resistance. If it's already near the floor, the disc is wearing thin. Replacing the clutch is a two-hour job with basic tools, but it's still a $300 to $500 expense depending on what parts you choose.
