RB25DET transmission rebuild needed? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Almosttt · 05-27-2018, 12:10 AM

I bought an RB25DET Series 1 swapped S14 about two months ago. Pretty sure the guy had it shipped with the original tranny. About a month ago the transmission started making this whining and slight grinding noise. The noise goes away when the clutch is pushed in, I think this suggests it is not the TOB but a bearing in the actual transmission.

I'm curious what I should do, and how long I can let it go like it is. Should I look for a rebuild kit? Should I buy a new/refurbished transmission? What is the model number of the transmission? Is there a better transmission that works with this setup I should get instead?

Sorry I don't have much experience with RB's or even swaps in general so I may have gotten in a little over my head :/

Yellow4g63 · 05-27-2018, 03:10 AM

clutch in and noise stops its the TOB.

kyral · 05-27-2018, 10:22 AM

in the case of a bad bearing a rebuilds not bad. getting a kit and parts and someone who knows how to do it might be difficult.

its probably the input shaft bearing. does it make noise in neutral?

if its actually whining that's bad that means somethings shifted and rubbing something else

a hissing or bearing noise would be a better situation my trans makes all sorts of soft bearing noises. I just load it up with lucas oil stabilizer and made my fluid really thick
I have had no issues but if its whining or any zipper noises that's bad

Thedriftbadger · 05-28-2018, 12:51 PM

If it was the tob it would make the noise when you press the pedal. Since it makes noise when the pedal is released it's the input shaft bearing. I drove my car with this noise for years and it never got any worse. Just replace it next time you have the trans out for clutch replacement or whatever. It's not dire. Make sure the fluid is full and is the correct type.

kyral · 05-28-2018, 04:45 PM

Input shaft bearing and input shaft pilot bearings are different btw I think ppl might be getting them confused

Thedriftbadger · 05-29-2018, 09:09 PM

Quote:

Originally Posted by kyral

Input shaft bearing and input shaft pilot bearings are different btw I think ppl might be getting them confused

The pilot bearing only spins when the clutch is disengaged (pedal pressed), i'd assume it would mimic the sound of a bad throw out bearing if anything. Either way, you're replacing both if one goes bad. Sound when pedal pushed/clutch disengaged: throw out or pilot bearing. Sound when pedal released/clutch engaged: input shaft bearing.

05-27-2018, 12:10 AM	#1
Almosttt Leaky Injector Join Date: Nov 2011 Location: GA Age: 32 Posts: 92 Trader Rating: (0) Feedback Score: 0 reviews	RB25DET transmission rebuild needed? I bought an RB25DET Series 1 swapped S14 about two months ago. Pretty sure the guy had it shipped with the original tranny. About a month ago the transmission started making this whining and slight grinding noise. The noise goes away when the clutch is pushed in, I think this suggests it is not the TOB but a bearing in the actual transmission. I'm curious what I should do, and how long I can let it go like it is. Should I look for a rebuild kit? Should I buy a new/refurbished transmission? What is the model number of the transmission? Is there a better transmission that works with this setup I should get instead? Sorry I don't have much experience with RB's or even swaps in general so I may have gotten in a little over my head :/

05-27-2018, 03:10 AM	#2
Yellow4g63 Zilvia FREAK! Join Date: Jan 2003 Location: Socal Posts: 1,454 Trader Rating: (5) Feedback Score: 5 reviews	clutch in and noise stops its the TOB. __________________ 95 240sx RB20 415whp 91 Nx2000 VVL yo

05-27-2018, 10:22 AM	#3
kyral Zilvia Junkie Join Date: Nov 2012 Location: wisconsin Age: 32 Posts: 448 Trader Rating: (7) Rides Gallery: kyral Feedback Score: 7 reviews	in the case of a bad bearing a rebuilds not bad. getting a kit and parts and someone who knows how to do it might be difficult. its probably the input shaft bearing. does it make noise in neutral? if its actually whining that's bad that means somethings shifted and rubbing something else a hissing or bearing noise would be a better situation my trans makes all sorts of soft bearing noises. I just load it up with lucas oil stabilizer and made my fluid really thick I have had no issues but if its whining or any zipper noises that's bad __________________ The Game you lose haha

05-28-2018, 04:45 PM	#5
kyral Zilvia Junkie Join Date: Nov 2012 Location: wisconsin Age: 32 Posts: 448 Trader Rating: (7) Rides Gallery: kyral Feedback Score: 7 reviews	Input shaft bearing and input shaft pilot bearings are different btw I think ppl might be getting them confused __________________ The Game you lose haha

05-28-2018, 12:51 PM	#4
Thedriftbadger Zilvia Junkie Join Date: Jun 2013 Location: ontario Posts: 305 Trader Rating: (0) Feedback Score: 0 reviews	If it was the tob it would make the noise when you press the pedal. Since it makes noise when the pedal is released it's the input shaft bearing. I drove my car with this noise for years and it never got any worse. Just replace it next time you have the trans out for clutch replacement or whatever. It's not dire. Make sure the fluid is full and is the correct type.