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05-04-2018, 08:45 PM | #1 |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Transmission Mystery
I need some advice. I have a stock 1930 Model A Coupe with the only modifications being running 40 Ford wheels. One day after leaving a stop sign it started jerking and had a horrible loud knocking noise coming from the transmission. After pulling over I discovered that I could go in second gear without the noise. Fortunately, I was close to the house and was able to nurse it home. I decided that I had broke first gear in the transmission.
Well, I just happened to have another transmission in my basement so I pulled the motor and trans and swapped it out. When I examined the trans it did not actually look bad but I went ahead and swapped it out. After all this work I took her out for a test drive and the same noise and jerking was there. I was not happy to say the least. So this time, I pulled the rearend and tourqe tube out. The end of the driveshaft showed damage at the end of the shaft, but it was only for the first quarter of an inch. I noticed that the u-joint bolt was loose and decided that was the culprit! So I thightened it up and went ahead and replaced the upper driveshaft bearing. After putting everything back together I backed out if the driveway and then put it in first gear. Same problem!!! I was furious but tried to ease her back in the garage with it making a racket. I got it in but this time I had another surprise, a trail of trans dope and a piece of cast iron. It blew out a piece of the transmission case at the drain plug. I am at a lost and would appreciate any advice... Thanks. RGG |
05-04-2018, 09:20 PM | #2 |
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Join Date: Oct 2017
Posts: 128
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Re: Transmission Mystery
I would hire a tranny expert. Better than guessing
Had anyone worked on the tranny recently? FW housing out of alignment can trigger this off center crank babbit can do it, anything that can strain the connection between motor and tranny roller brgs in tranny prolly shot who worked on the tranny and left the u-joint bolt loose? gears from argentina? forks messed up and going into 2 gears at once? really hard to blow the case need total overhaul |
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05-04-2018, 09:26 PM | #3 |
Senior Member
Join Date: May 2010
Location: Nelson. New Zealand
Posts: 2,009
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Re: Transmission Mystery
Sounds like a tooth loose in the trans, If it blew a hole in case then problem is in the trans . Or we need more history on box. rear end etc , Been fine up till now or what ? How close did you inspect each trans , Looked or had apart ?? Same top ?? Selector fork located correct. ??
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05-04-2018, 10:21 PM | #4 |
Senior Member
Join Date: Dec 2013
Location: Mossel Bay, about 300km from Cape Town
Posts: 530
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Re: Transmission Mystery
RGG,
Confirm same problem on two different gearboxes. Did you use the same top cover and shifter on both? Regards Chris |
05-04-2018, 10:54 PM | #5 |
Senior Member
Join Date: Sep 2010
Location: Danville, CA
Posts: 1,554
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Re: Transmission Mystery
What shape was the flywheel cover in? Since you will be pulling the tranny anyway, check it for cracks and flatness where the tranny bolts up. Look at you motor mounts while you are at it. I had an odd sound that seemed like just the tips of the gears were engaging in low but it would pull fine in second. Had the cover off and everything looked okay. Greased the throwout bearing holder so it slid in and out freely and that solved the problem.
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05-04-2018, 11:28 PM | #6 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,961
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Re: Transmission Mystery
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05-05-2018, 06:52 AM | #7 | |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
Quote:
I am thinking that maybe it's the ujoint? Could excessive slack with it allow the main shaft to move under load to cause the gears to hit the case? Thanks for the help! RGG |
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05-05-2018, 06:54 AM | #8 |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
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05-05-2018, 06:56 AM | #9 | |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
Quote:
Thanks. RGG |
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05-05-2018, 07:03 AM | #10 | |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
Quote:
It has a new pilot bearing, but what do you mean by flywheel run-out? I apologise if this is something simple that I should know. Thanks. RGG |
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05-05-2018, 10:02 AM | #11 |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
Well, after searching all of the posts u now know how to check for flywheel run-out.
It also appears that I am the only one who has busted a transmission case! Not the prize I wanted to win! Thanks. RGG |
05-05-2018, 01:54 PM | #12 |
Senior Member
Join Date: Jun 2013
Location: Marana Arizona
Posts: 1,776
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Re: Transmission Mystery
Hang in there and don't get discouraged. We've all been there, even if only some of us will admit it.
Bet you will double check everything before putting it back together. I pulled a tranny in my truck three times before getting it sorted out. Keep us posted and "Enjoy the adventure". Chap |
05-05-2018, 02:09 PM | #13 |
Senior Member
Join Date: Apr 2013
Location: Columbia, TN.38401
Posts: 422
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Re: Transmission Mystery
take the transmission to the right welder and he can weld your transmission back together.
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05-05-2018, 02:39 PM | #14 |
Junior Member
Join Date: Nov 2010
Location: Acworth, GA
Posts: 13
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Re: Transmission Mystery
Ok, found a broken gear tooth in the driveway. I am thinking that the ujoint allowed the shaft to move enough shear the tooth and then the tooth wedged between the gear and the bottom of the case.
I am going to order a new ujoint from synders and may go ahead and replace the rear end and torque tube with another one that I have. I told my wife all of the extra old parts I have would be useful one day! Thanks. RGG |
05-05-2018, 04:27 PM | #15 | |
Senior Member
Join Date: May 2010
Location: So Cal
Posts: 8,747
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Re: Transmission Mystery
Quote:
https://www.fordbarn.com/forum/showt...nsmission+case Bob |
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05-05-2018, 05:22 PM | #16 |
Senior Member
Join Date: Jul 2010
Location: Aiken, South Carolina
Posts: 695
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Re: Transmission Mystery
Don’t bother trying to weld, braze, or otherwise repair that busted case. Good ones can be had for $10-20 bucks. A welder is bound to charge vastly more than that. Tranny cases are a common item. Contact Bert’s in Denver for a replacement.
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05-05-2018, 06:57 PM | #17 |
Senior Member
Join Date: Nov 2010
Location: Sebastian, FL
Posts: 479
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Re: Transmission Mystery
I second BERT'S. Not only good quality used parts but great advice. I had a cracked axle, noisy tranny, bad rear spring. Thank's to Steve it is back together and all replacement parts great. DO take your time and clean everything while apart. If in doubt ask an expert to check it out before continuing. If you have a local club - JOIN IT!! Wealth of experience and advice. I know first hand!!!
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05-05-2018, 07:15 PM | #18 |
BANNED
Join Date: Oct 2017
Posts: 128
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Re: Transmission Mystery
"ake the transmission to the right welder and he can weld your transmission back together."
good luck with that |
05-06-2018, 10:50 AM | #19 |
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Join Date: Apr 2017
Location: Sacramento
Posts: 1,262
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Re: Transmission Mystery
I do this stuff for a living,I cant tell you how many comebacks I've had or have seen because of one fatal flaw.No matter what you are repairing you have to find the root cause of the failure.You have to finger the culprit to solve the crime.
Baring that simple reasoning we are all guilty of not following you are doomed. |
05-06-2018, 11:44 AM | #20 |
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Join Date: Oct 2017
Posts: 128
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Re: Transmission Mystery
Doomed?
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