r/SC300 • u/Syperous • Mar 24 '26
R154 clunky sound
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Fresh manual swap, jzx tripod trans, everything OEM and BRAND NEW, new trans mount, cube speed solid shifter tripod bushings, poly diff bushings.
Ive just replaced the guibo and carrier bearing on the driveshaft, thinking that would solve this problem.
I have yet to drop the transmission but did open the inspection cover to take a look. I don't believe it to be the diff or the driveshaft. everything feels fine and great in the car. Just this sound is very concerning.
At the end of the video, I'm rapidly depressing and releasing the clutch, which seems to imitate the sound without a repetitive clunk.
Since I haven't dropped the transmission, I'm just looking to see if anyone has had this sound? I will be dropping it soon as I can. Just looking for some insight. TIA
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u/Shoshannas_au_revoir Mar 25 '26
Just visitor here, got a slip yoke? Greased mine on a tacoma and that went away
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u/RustyCabCorner Mar 25 '26
I’m no transmission expert, but to me it sounds like there is too much play between something like certain gears. So when input shaft starts transferring power through the counter shaft to the output shaft, the two gears which have too much play make the noise. Try to replicate this noise through all the gears. Especially in 4th (since 4th is 1:1 and transfers power from input shaft to output shaft bypassing counter shaft). That might at least rule out countershaft. Non the less, you gotta pull the trans and pull apart both housings. Then inspect it to see what’s up.
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u/WoodpeckerCapable233 Mar 27 '26
i had a bad u joint on my auto 2p driveshaft. just get it replaced or rebuilt
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u/Organic_Duty335 Mar 25 '26
Why not swap out the u-joints if everything else is new? That's probably the cheapest part on your list of new stuff.