Although yours started whining after you performed work to it, my transmission started whining and then 3 months later after the whine got worse and worse....boom. Every gear except 4th was gone.
Very close to what I was gonna say. My car was whining very loud in fifth, couldn't hear it in other gears due to pipe. It was the input bearing and race, and the 15 needle bearings. When I bought the car they had changed the clutch, but not the pilot bearing.So no whine in 4th gear?
That tends to signal an issue with the mainshaft roller bearings between the input shaft and the mainshaft. These are the 15 or so loose bearings that the mainshaft snout sits in inside the input shaft.
The whine is usually the loudest in 1st and reverse due to the differential turning speeds between the two shafts being greatest. It will be quieter in 2nd and 3rd as the shafts get closer in speed...and silent in 4th due to being 1:1.
usually it's caused by low fluid level or improper fluid. The fluid doesn't get to the bearings and lubricate it properly and the shaft of the mainshaft scores up and you get the whine.
The fix usually requires replacing the mainshaft as the tip gets chewed up pretty well.
You can try changing the fluid or making sure it's topped off, or replacing the bearings, but inspect the tip of the mainshaft and if it looks damaged you'll need to live with the noise or replace the shaft
The damage will look something like this..which resembles pitting
Rick's right: it takes a shim kit and some specialized tools to get the preload set on a T5. Anytime you replace the input shaft bearing, you need to check the preload.What did you set the preload on the input shaft at? You truly want no preload on the input bearing with a max of .002"
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I just got my clutch replaced, the shop told me there was gear box fluid in the transmission, I drove it around at least 3k miles like that, and the car had over 50k miles on it when we bought it. I never really heard a whine come from the transmission. The shop did put the correct fluid in the transmission.The wrong transmission fluid would cause a whine. Mine has a slight whine now, which it never did. When I took mine apart, the previous owner ran gear oil. I put Full Synthetic Mobile1 ATF. 6 months later, it hasn't gotten any louder, and still shifts perfect.
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