Author Topic: 4 spd noise question  (Read 3127 times)

Offline Moparal

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4 spd noise question
« on: May 21, 2008 - 06:49:20 PM »
 :clueless:  Bare with me as I try to explain the best I can

68 440 automatic crank. The end was drilled deep, but not prepped for a 4 spd from the factory. So I bought the bearing that fits in the flange. All seems ok but with these comments, so give me your imput :2thumbs:

If I start my car in neutral , it will surge forward maybe a half an in, maybe

As I drive my car in any given gear, up shifting or down shifting, I can hear a whining noise. But not in neutral setting still

I was wondering if maybe there is a slight chance the noise might be that the trans input shaft might be touching the bottom of the hole in the crank. Not enough to really keep the shaft engaged when the clutch pedal is down, but maybe enough to cause some harmonics throughout the drive train

Is it possible?  I am pulling the trans pretty soon to put a better clutch in it and reseal the trans. Thought I may run a file over the snout end. I am thinking I should see some kind of sign of bottoming out.

Or maybe I have a bearing going out. I dont know




sleepychallenger

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Re: 4 spd noise question
« Reply #1 on: May 21, 2008 - 07:05:38 PM »
is it just when you push the clutch in?

Offline Moparal

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Re: 4 spd noise question
« Reply #2 on: May 21, 2008 - 07:30:58 PM »
Nope, when I am driving down the road

Offline ntstlgl1970

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Re: 4 spd noise question
« Reply #3 on: May 21, 2008 - 07:37:24 PM »
:clueless:  Bare with me as I try to explain the best I can

68 440 automatic crank. The end was drilled deep, but not prepped for a 4 spd from the factory. So I bought the bearing that fits in the flange. All seems ok but with these comments, so give me your imput :2thumbs:

....If I start my car in neutral , it will surge forward maybe a half an in, maybe

Something is dragging inside the trans. whether the noise is related or not is a tough call. you said it doesn't make noise in neutral sitting still, does it make any difference if the clutch is in or not while sitting still as to the noise? Does the noise get quieter in 4th gear?

70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....

Offline Moparal

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Re: 4 spd noise question
« Reply #4 on: May 21, 2008 - 07:41:12 PM »
Setting still clutch in or out no noise. In or out of any gear setting still no noise. As I drive down the road in 4th, whine, sounds like an old scool bus or when you have a granny 4 spd and you try to put it in first while still rolling a bit fast. You know that sound?

sleepychallenger

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Re: 4 spd noise question
« Reply #5 on: May 21, 2008 - 07:47:23 PM »
sounds more like bearings to me. more load as you are moving in gear. does it do it if you are in gear but sitting still?

Offline Chryco Psycho

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Re: 4 spd noise question
« Reply #6 on: May 22, 2008 - 03:48:50 AM »
Very possible , the nose of the input shaft touching inside the rear of the crank will cause the car to try to move forward & put excessive load on both the front & rear brg inside the tranny

Challenger - You`ll wish You Hadn`t

Offline ntstlgl1970

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Re: 4 spd noise question
« Reply #7 on: May 22, 2008 - 02:24:43 PM »
when you put the trans in the car, did it slide in all the way by itself or did you have to pull the trans into the clutch/pilot bearing using the mounting bolts (you shouldn't ever have to do that). I'm guessing that you had to pull it in with the bolts in which case I would agree with CP, maybe the input shaft bearing is taking a thrust load which it isn't designed to do. The fact that it still makes noise in 4th elminates my other guess, which would have been the countershaft bearings/thrust washers.
70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....

Offline Moparal

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Re: 4 spd noise question
« Reply #8 on: May 22, 2008 - 05:11:37 PM »
Sorry it took me a while, but I am off work now. I have been going in at 245 am so I had to sign off early last night. 

No I didnt force the trans in by useing the bolts, I used my tool, then pushed on the throw out fork and it popped in most all the way. But not to say I cant remember the last 2 or 3 threads pulling it up or not.  I'm hoping I see some kind of mark on the end of the snout when I do the job. This will make it to where I know what I am dealing with. The trans works as good as expected other then the noise. The trans makes no noise at all when setting still idleing with foot on or off clutch.

I will know soon. I get my break after next week. I am shooting down to Mobile first to finish up the job I left. Then not answering my phone for 2 weeks if I see work calling :clapping:

Offline ntstlgl1970

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Re: 4 spd noise question
« Reply #9 on: May 22, 2008 - 05:19:26 PM »
Drr, what was I thinking, if it is quiet when stopped and noisy any other time, it has to be related to either the output shaft bearing or something going on in the rear end (pinion bearings/diff case bearings). The input shaft bearing would make noise at idle also with the clutch pedal out, the pinion bushing would make noise with the clutch pedal pushed in.
70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....

Offline Aussie Challenger

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Re: 4 spd noise question
« Reply #10 on: May 23, 2008 - 05:35:50 AM »
  When box is out check the depth inside the crank, check the input shaft end, if that is fine then it will be either the output shaft bearing or it is out the back at the diff.
  My guess is the input shaft based on your info as you would have heard the diff last time you drove it before these last modifications.  my    :2cents:
Dave

Offline troutstreamnm

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Re: 4 spd noise question
« Reply #11 on: May 25, 2008 - 11:21:42 PM »
Keep us posted on what you find out
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Offline jackie

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Re: 4 spd noise question
« Reply #12 on: May 28, 2008 - 04:42:45 PM »
sometimes people put atf in 4-speeds. it will work ,but sometimes it will make it whine. if it has atf change it to 85w90 gear oil. and it will go away. if it is not the input shaft touching the crank..good luck..
1970 challenger r/t, prostreet 438 ci. 4 speed

Offline Moparal

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Re: 4 spd noise question
« Reply #13 on: May 30, 2008 - 07:57:26 AM »
Weel, since I am home now, I will be working on my car a few days and over the weekend quite a bit.  The trans will be coming out. So I am putting in a new ram clutch system, turning the flywheel, new brake and clutch pedals for 70/71 e bodies since I am not sure of the ones I have, Installing a seal kit on the trans, and looking for any type of a problem while the trans is out. Then I need to install a new accelerator pump gasket on my center carb, hook up the rear speakers to the radio, and pull the steering column out to re install the spline connector right. I got the clips wrong.

I can't wait to start playing. I am hoping my new dana is ready to go pick up from the speed shop.

Swedefish

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Re: 4 spd noise question
« Reply #14 on: May 30, 2008 - 08:44:21 AM »
Does the sound become louder when cornering? Just a thought, wheel bearings  :dunno:
If the crank is touching the input shaft shouldn`t there be noise only when you activate the clutch?