[Shop-talk] Manual transmission issue???

Sun May 25 18:53:29 MDT 2025

Helical gears present an axial load, usually addressed with thrust 
bearings. Failing ball bearings can make a whirring sound, so a ball 
bearing that handles the axial thrust could be the culprit. I'm guessing 
that the axial load would be greater in higher gears so that's where 
it's noticeable. Your deeper dive into noise analysis may reveal fainter 
noise in the lower gears. Again, mostly a guess, but I used to replace 
bearings on one of my 3-cylinder Saabs quite regularly because of noise.

The good news, I suppose, is that it seems unlikely  that such a 
condition could have been the fault of the repair shop. I don't know how 
you could cause that damage from the outside.

My solution would be to hunt for a salvage yard transmission. And help 
her with the labor.

On 5/25/2025 12:52 PM, Pat Horne wrote:
> Also, try up hill & down.
>
>
> Pat Horne
> We support Habitat for Humanity
>
>
> On May 25, 2025, at 10:51 AM, Moose <eric at megageek.com> wrote:
>
> Jeff, this is a good idea.  Will do.
>
> The reason I'm really confused is that the noise is only when you give 
> it ANY throttle.  So even if you are not accelerating (i.e. Not under 
> load.), but just have the pedal down a little, you hear the noise.
>
> Wouldn't both the differential and drive shafts make noise all the 
> time, or at least under load?
>
> But I plan to do a much deeper dive.
>
> Thanks again to everyone with this.
>
> Moose
>
>
>
> From: Jeff Scarbrough <fishplate at gmail.com>
> To: Moose <eric at megageek.com>
> Cc: "shop-talk at autox.team.net" <Shop-talk at autox.team.net>
> Date: 05/25/2025 11:03
> Subject: Re: [Shop-talk] Manual transmission issue???
> ------------------------------------------------------------------------
>
>
>
> Have you checked the differential(s) and drive shafts? My TR6 had an 
> annoying transmission noise that, after a rebuild, turned out to be in 
> the diff.
>
> Noises in a car are notoriously hard to track down by sitting inside.
>
> On Sun, May 25, 2025, 08:47 Moose <_eric at megageek.com_ 
> <mailto:eric at megageek.com>> wrote:
> Braintrust,
>
> I don't mess with transmissions at all, so I'm in the dark here. 
> Hopefully someone has the answer and it's an easy fix.
>
> The issue,   2017 Jeep Patriot with a 5 speed manual transmission 
> makes a 'whirring' sound when driving in 3rd gear or higher.
>
> Started about a year ago, when car was picked up from a franchise 
> mechanic shop.  (owner of car is a single woman without much money.)
>
> When she called them back they where like, "Well, we would have to 
> charge you to look at it."  So since she already suspected they caused 
> the issues, she didn't want to give them more money.
>
> She brought it to another shop and they said, "You need a new 
> transmission."  That will more than likely exceed the valve of the 
> Jeep. So they just did a fluid change, and that was it.  Note, in 
> their carfax report, they listed that they "installed a new 
> transmission" in addition to the fluid change, so I don't trust them 
> either.
>
> It's a manual 5 speed.  I checked the fluid level and it is exactly 
> where it should be.  So I did a road test.
>
> Here is the crazy part.
> There is NOTHING that I can feel that would indicate any transmission 
> problems. No slipping, no chucking, it shifts smooth and pulls 
> strong.  No vibrations. The only thing is that noise, and that ONLY 
> happens when you give it throttle.
>
> So if you are going down the street at 50, and take your foot off the 
> gas pedal, noise goes away. If you just give it a little gas, noise 
> returns.
>
> If you have it in neutral coasting, no noise.  If you are engine 
> braking, no noise. The noise is ONLY if you have your foot on the gas 
> in the slightest.
>
> Note, there is also no noticeable noise in 1st or 2nd gear.
>
> I am thinking that the original shop did something to the car to make 
> it start this noise, knowing she would take it back there to get it 
> fixed and that it's a simple fix.
>
> I would love to be able to fix this as it is a hard working girl that 
> doesn't have much money and really takes care of her car.  She is also 
> a good friend of my fiancee, so it would be bonus points for me. 8>)
>
> Thanks and I hope everyone takes a moment to think about all the 
> Soldier's that gave their lives to protect our freedoms, (no matter 
> what country you are from.)
>
> Have a great weekend!
>
> Moose_______________________________________________
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