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Old 05-30-2020, 09:39 PM   #1
waltere
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Default Noise in 2nd gear 39 Transmission

2000 miles on complete rebuild of transmission. Started with a slight vibration only upon deceleration in second gear only. After about another 100 miles started making light clunking noise and whine in second gear only. Great shifting and no noise under acceleration in any gear. Looking for advise!
Thanks in advance!
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Old 05-30-2020, 11:52 PM   #2
cas3
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Default Re: Noise in 2nd gear 39 Transmission

clunking to me would mean something is very unhappy. first thing i would do is drain the fluid to check for metal. got a magnetic drain plug? i like those. vibration, and noise on deceleration i would think a rear end issue, or drive shaft. good shifting means the end play and bearings should be working correctly. puzzler! go to step one-check the fluid
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Old 05-31-2020, 08:33 AM   #3
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Default Re: Noise in 2nd gear 39 Transmission

drain rear axle and check for metal there also. had a pin on the coupler break and come off and get into the rear gear lock nuts. grease the u joint with recommended grease corn head or the 1/2 x 1/2 combo
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Old 05-31-2020, 09:28 AM   #4
waltere
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Default Re: Noise in 2nd gear 39 Transmission

Great ideas! I never thought about the rear axle. I will drain both trans and rear and report back.
Thanks
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Old 05-31-2020, 02:29 PM   #5
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Default Re: Noise in 2nd gear 39 Transmission

It's worth considering a loose u-joint bolt at the trans output shaft as well. That allows excessive end play in the trans and can show up in 2nd gear as a first symptom.
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Old 05-31-2020, 10:15 PM   #6
waltere
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Default Re: Noise in 2nd gear 39 Transmission

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I drained both transmission and rear differential in separate clean pans. Differential looks good but transmission lube has silver cast. Put magnet in both but could not pick anything up. No chunks visible. ANY THOUGHTS!
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Old 05-31-2020, 11:40 PM   #7
30Murray
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Default Re: Noise in 2nd gear 39 Transmission

Did you replace the cluster gear roller bearings? Most of those available now are imported junk and can fail prematurely. Look for Tom Endy's post below ( under Model A's) or his tech articles under Santa Anita A's.


https://www.fordbarn.com/forum/showthread.php?t=266282

Last edited by 30Murray; 05-31-2020 at 11:49 PM. Reason: added link
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Old 06-01-2020, 04:15 AM   #8
waltere
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Default Re: Noise in 2nd gear 39 Transmission

All new bearings. my guess is they are failing. Thanks for sharing the link
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Old 06-01-2020, 05:06 AM   #9
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Default Re: Noise in 2nd gear 39 Transmission

Bearings has been of questionable quality so has the shafts...
There has been shafts soft and undersize from the big vendors.
First tell tale on the shafts is that they just fall into the bore...then they will leak like a sieve...should be tight in the housing bore.
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Old 06-01-2020, 05:21 AM   #10
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Default Re: Noise in 2nd gear 39 Transmission

And you can file them they are so soft,
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Old 06-01-2020, 06:59 AM   #11
john in illinois
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Default Re: Noise in 2nd gear 39 Transmission

Barnfind08 here has NOS cluster bearings. Do not know if he has shafts

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Old 06-01-2020, 07:07 AM   #12
alanwoodieman
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Default Re: Noise in 2nd gear 39 Transmission

silver cast could mean thrust washer has worn down which will cause too much movement of the cluster gear. did the trans rebuilder face the thrust plate part of the trans case? This is a weak point of these trans
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Old 06-02-2020, 09:57 PM   #13
waltere
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Default Re: Noise in 2nd gear 39 Transmission

All great ideas. The gentleman that rebuilt it for me was very experienced. Not to say he didn't make a mistake. I am going to pull it (MAJOR JOB) and i will let you now what I find.
Thanks for the help!
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Old 06-02-2020, 11:10 PM   #14
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Default Re: Noise in 2nd gear 39 Transmission

Do you have a torque tube with center bearing? Dont discount that...
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Old 09-23-2020, 10:27 PM   #15
waltere
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Default Re: Noise in 2nd gear 39 Transmission

So here is conclusion of the noise. Everyone's suggestions wee appreciated!! Once I came to the conclusion the transmission was the problem I decided to build a complete new box and do a swap. Called my go to guy @ All Ford and got the run around so I called Mac Vanpelt. Mac answered the phone on the first ring and convinced me that he could build me a good gearbox. I found a case from a GENTLEMAN here on the Barn and He sent it as promised & as represented. I sent it to Mac and He did exactly what he said he would do and delivered it ON TIME! I now have it back in the car and put about 200 miles on it. WORKS GREAT!!! Mac is a pleasurer to do business with!! THANKS MAC!
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Old 09-24-2020, 04:49 PM   #16
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Default Re: Noise in 2nd gear 39 Transmission

So, did you (with Mac) determine WHAT was cause of trans problem (s) ??
It would be instructive/helpful to all here, to see what Mac found...that caused the symptoms that made you seek help here !
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Old 09-24-2020, 04:52 PM   #17
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Default Re: Noise in 2nd gear 39 Transmission

Can you inform US, WHAT Mac found to be the cause of your trans symptoms that you reported here initially ?
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Old 09-24-2020, 06:46 PM   #18
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Default Re: Noise in 2nd gear 39 Transmission

Not sure who this customer is, but reading his post, I believe he sent us a core transmission (or perhaps just the gearbox case). Whatever we got from him wasn’t his original transmission. So I can’t really comment on what was going on with his other trans.
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Old 09-24-2020, 07:57 PM   #19
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Default Re: Noise in 2nd gear 39 Transmission

Mac is a very helpful person. First class
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Old 09-25-2020, 10:41 PM   #20
JM 35 Sedan
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Default Re: Noise in 2nd gear 39 Transmission

Quote:
Originally Posted by hardtimes View Post
Can you inform US, WHAT Mac found to be the cause of your trans symptoms that you reported here initially ?
In reading Waltere's last post, it does not say he sent his failed transmission to Mac VP. He found another case and sent that to Mac for build or rebuild. Then swapped his defective trans with the one Mac built.
Maybe if you send Waltere a pm, he will clarify what he found wrong with his original transmission, and also post that follow-up info here as well.
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