Manual Transmission Noise

Yep... Not letting out on the clutch, just putting it into gear with the clutch still in. Usually at 20, but sometimes I shift early as high as 25... And then coast a while before letting out on the clutch.

Usually for sharp turns that I know I have to slow down to below 10 mph for.

 

Yah, logically I know that, but emotionally I don't want to believe it because it sounds like my truck when I let out the clutch, so I think he's lying (not really).

 

I am by no means a mechanic, but 1st going above 10-15ish would have my RPMs well about 6k. The fact that you aren't getting jostled makes me think there's a clue there re. your problem.

 

I wish I was. My trucks power train warranty just expired a couple months ago, so if it's something that needs to be fixed, it's coming out of pocket.

 

If I let out on the clutch, at 20, I'd be at 3000-3500 RPMs on the engine, or are you talking about transmission RPMs?

 

How long have you been driving this truck? Did something change? 20-25 mph downshift to 1st is on the fast side, poor practice, and lots of wear on the 1st gear synchros. You know when you complete this shift with the clutch in you are still causing the synchro to have to spin up the input shaft and clutch disk to match the ground speed, right? You are very much "overdriving" the input shaft and clutch disk.

 

I think folks are overreacting to my comment... As in sometimes I downshift at 25 and coast. Did you watch the video? It's usually 20 mph and that's what I put on the video, but also that noise happens any time I downshift over 10 mph... With the clutch in and whines until below 5 mph. That's not normal, and hasn't been normal on the 7 different manual transmissions I've owned in the last 30 years.

I've only seen this one other time, and it was because the previous owner started out in second gear all the time and screwed up the synchro to the point it had to be replaced. Not too be impolite, but I'm looking for folks who have experienced this before, not a lot of guessing and finger pointing.

 

That's just too fast man, 1st gear in these trucks is very low, it should be used for starting only when coming to a stop if you want to be in gear use 2nd, if you feel the need to be in first you should be under 10mph and rev match before shifting even with the clutch depressed.

 

Did you even read what I wrote? I don't downshift unless I know the turn coming up is going to be below 10mph. All the arm chair QBs need to just stop.

 

1st gear really should only be used for starting from a dead stop. i don't see why you would need to downshift to first unless you are coming to a complete stop. and if you really do feel the need to downshift to first, then rev matching is important, especially for 1st gear.

 

This is the death spiral I've seen so many times in these threads. One person shares an opinion and then everyone that band wagons on top of it without even reading.

You did the same thing clearly, because I've never even let out on the clutch when my truck is making this noise! C'mon man. If you don't know, just keep quiet.

 

i do know, that's why i chimed in. you just seem to be ignoring everyone's advice. all my cars do they exact same thing you are describing to an extent. will ignore you from here on out then.

 

That's fine with me... But it's not a normal noise. Even the Toyota service tech that listened to it said so. I'm just waiting to get my truck in to have it diagnosed, and wanted some experienced opinions to help out.

Instead I keep getting people who don't have as much driving experience and haven't owned as many manuals telling me that I'm downshifting too soon. A normal vehicle should not make this noise at 25, 20, 15, 10 or 5 mph... WITH THE CLUTCH IN!

Yet all anyone can say is, your downshifting too early. I haven't even downshifted yet, the clutch is in. Yes, I understand the synchro starts spinning, but it should not be that loud at 20 and below.

This repeat idea has already been ruled out. So forgive me, but I'd like to hear from someone who actually knows what they're talking about, instead of retread opinions.

 

I read everything you posted and offered a response. I explained to you why having the clutch in doesn't matter. It's whining because having the clutch in allows the clutch disk and input shaft to be over-driven.

This same driving technique is probably why your wrangler ended up with trashed parts.

Also, saying starting a vehicle in 2nd gear caused a synchro to get ruined further demonstrates you don't understand the technical operation of manual transmissions.

I asked a few questions you refused to answer to try and help you get to the bottom of this. You are welcome to your opinion and welcome to share your opinion, but we don't have to play along. You seem to be the one struggling to keep manual transmissions alive in your vehicle. Not us.

Good luck!

 

Again, you didn't read. I just bought this Tacoma less than a month ago. The Jeep was also used. I don't have any problems keeping my transmission running well. These are problems I've inherited. Your just mad because I don't value your opinion.

The problem is I've already heard 5+ times, and the Toyota tech who rode in the vehicle with me didn't have any problems with my shifting techniques, said it wasn't normal, and then scheduled me for a diagnosis next week. If it was as simple as not putting the vehicle into gear at 15-25 mph, then he would have said so.

And the last vehicle that had the synchro replaced a month after I bought it, made a similar noise. Both of which had the noise immediately upon receipt if the vehicle.

So please just stop with your incessant arguing. When I know a service tech has already debunked your theory. It's ok to be wrong dude.

 

Yes it should - that's exactly the point I'm trying to make. You are shifting into 1st gear in the gearbox even if you're not connecting the engine to the gearbox through the clutch. You are hearing 1st gear spin at a speed that is too high for it.

 

No it's not. Toyota tech's disagree with you and so do I. No worries. Once the dealer has diagnosed it, I'll reply back, so you guys can all eat crow with egg on your faces.

 

Believe it or not I'm trying to help you but you're awfully sensitive. I'll try without the technical stuff.

The noise (whine) you hear when you shift into 1st at 20mph is normal. Every Toyota will do it. Mine does. It's the same whine as when you're under power at 20mph in 1st but there's other noise in that case to drown it out.

The tech is wrong, your truck is fine, and your truck is normal. You will be chasing a ghost trying to fix this normal noise.

 

Let em chase the ghost. Maybe his "toyota tech" will just get him to buy a new trans . I agree with everyone here.