The Ford Barn

timdhawk · 08-04-2014, 04:59 PM

Well, I'm not that well versed in transmissions so I apologize if this is a dumb question.
Do I need to replace my main drive gear since it has half a tooth broken off? All other teeth are good.

33cabriolet · 08-04-2014, 05:16 PM

replace,if another tooth breaks it can jam and push the bottom of the case out.John

Kube · 08-04-2014, 06:12 PM

Quote:

Originally Posted by timdhawk

Well, I'm not that well versed in transmissions so I apologize if this is a dumb question.
Do I need to replace my main drive gear since it has half a tooth broken off? All other teeth are good.

YES! YES! YES! The gear has been compromised and will, without question, come apart further.

Ross F-1 · 08-04-2014, 06:13 PM

Check your cluster gear that mates with it.

dude · 08-04-2014, 07:43 PM

just a matter of time. Looks like you have the gear out , so replace it.

ford3 · 08-04-2014, 10:00 PM

Sponsored Links (Register now to hide all advertisements)

its not to bad right now but its going to get a lot worse and pretty fast, if it loses another tooth and it falls in the teeth of the cluster things are going to get bad real fast, as others have said, replace it and the cluster gear if it has any chipped teeth

timdhawk · 08-05-2014, 08:51 AM

awesome. thanks guys. I was leaning that way anyway, its just nice to have the verification.

dean333 · 08-05-2014, 09:16 AM

I probably should pull my trans next winter. When I changed all the fluids upon first getting my 36 Fordoor in 2011 a piece of gear came out of the trans. I get a little grind when shifting to 2nd periodically......sometimes to 3rd and sometimes back to 1st at a stoplight. A good winter project I guess.

cmbrucew · 08-07-2014, 09:27 PM

dean333
Adjusting the free play for your clutch petal should cure the grind.
Bruce

dean333 · 08-08-2014, 08:38 AM

Bruce, I checked the free play, it was ok. It doesn't grind on every shift, I'd say about 25% of the time. Thanks for your input.

OLD...BILL · 08-08-2014, 12:20 PM

Worry worry worry,,, yes it may break apart some more, but the important thing here is " TOOTH COUNT " ,, count the teeth on the input gear and match the new one to it, yes it do make a differance, with some of the bright people here on the barn, responding and no one said to count the teeth ... go figure ....OLD....BILL

V8COOPMAN · 08-08-2014, 01:07 PM

Tooth count is an obvious "given" for everyone that understands the "Rule of 44". DD

supereal · 08-08-2014, 01:20 PM

Replace the bearing, as well. If it has seals on both sides, as some do, remove the tin on the inside face before installation.

timdhawk · 08-09-2014, 06:03 PM

Talked a lot with Mac Vanpelt. Found out the teeth in mine were 29 and 15 rather than
the "normal" 28 and 16... (49 Merc 3 speed w/ OD). I will be replacing with a 15 tooth MDG and keeping the 29 tooth cluster gear.

If bearing is good w/o any grabbing, grinding or free play should I still replace it? How do you know if they are bad if they aren't "obviously" bad?

Also, fill the new kid in... what's the "Rule of 44"?

Mike B · 08-09-2014, 06:07 PM

I think it's referencing total tooth count should be 44

29 + 15
28 + 16

svm99 · 08-09-2014, 06:11 PM

15T Input + 29T Cluster=44, 16 + 28=44, 18 + 26=44

Just a bit info for trans guys.

Paul J.

08-04-2014, 05:16 PM	#2
33cabriolet Senior Member Join Date: May 2010 Location: Graham WA Posts: 424	Re: Broken tooth on main drive gear - replace? replace,if another tooth breaks it can jam and push the bottom of the case out.John

08-04-2014, 06:13 PM	#4
Ross F-1 Senior Member Join Date: Nov 2010 Location: NM Posts: 2,438	Re: Broken tooth on main drive gear - replace? Check your cluster gear that mates with it. __________________ '52 F-1, EAB flathead

08-04-2014, 07:43 PM	#5
dude Senior Member Join Date: May 2010 Location: Kansas Posts: 334	Re: Broken tooth on main drive gear - replace? just a matter of time. Looks like you have the gear out , so replace it. __________________ [QUO[/QUOTE]no matter where you are,or where you're at, there you are...

08-04-2014, 10:00 PM	#6
ford3 Senior Member Join Date: Oct 2012 Location: oroville calif. Posts: 1,453	Re: Broken tooth on main drive gear - replace? Sponsored Links (Register now to hide all advertisements) its not to bad right now but its going to get a lot worse and pretty fast, if it loses another tooth and it falls in the teeth of the cluster things are going to get bad real fast, as others have said, replace it and the cluster gear if it has any chipped teeth

08-05-2014, 08:51 AM	#7
timdhawk Member Join Date: May 2014 Location: Billings, MT Posts: 49	Re: Broken tooth on main drive gear - replace? awesome. thanks guys. I was leaning that way anyway, its just nice to have the verification.

08-05-2014, 09:16 AM	#8
dean333 Senior Member Join Date: Jun 2012 Location: Shorewood Illinois Posts: 863	Re: Broken tooth on main drive gear - replace? I probably should pull my trans next winter. When I changed all the fluids upon first getting my 36 Fordoor in 2011 a piece of gear came out of the trans. I get a little grind when shifting to 2nd periodically......sometimes to 3rd and sometimes back to 1st at a stoplight. A good winter project I guess.

08-07-2014, 09:27 PM	#9
cmbrucew Senior Member Join Date: Dec 2010 Location: North of sandy ago, CA. Posts: 2,064	Re: Broken tooth on main drive gear - replace? dean333 Adjusting the free play for your clutch petal should cure the grind. Bruce __________________ Works good Lasts long time

08-08-2014, 08:38 AM	#10
dean333 Senior Member Join Date: Jun 2012 Location: Shorewood Illinois Posts: 863	Re: Broken tooth on main drive gear - replace? Bruce, I checked the free play, it was ok. It doesn't grind on every shift, I'd say about 25% of the time. Thanks for your input.

08-08-2014, 12:20 PM	#11
OLD...BILL Senior Member Join Date: May 2010 Location: Northern California,coast Posts: 552	Re: Broken tooth on main drive gear - replace? Worry worry worry,,, yes it may break apart some more, but the important thing here is " TOOTH COUNT " ,, count the teeth on the input gear and match the new one to it, yes it do make a differance, with some of the bright people here on the barn, responding and no one said to count the teeth ... go figure ....OLD....BILL

08-08-2014, 01:07 PM	#12
V8COOPMAN Senior Member Join Date: May 2010 Location: East Shore of LAKE HOUSTON Posts: 11,114	Re: Broken tooth on main drive gear - replace? Tooth count is an obvious "given" for everyone that understands the "Rule of 44". DD __________________ *Click Links Below* __ ▼ *'35-'36 W/8BA & MECHANICAL FAN* *T5 W/TORQUE TUBE*

08-08-2014, 01:20 PM	#13
supereal Senior Member Join Date: Jul 2014 Location: Iowa Posts: 1,634	Re: Broken tooth on main drive gear - replace? Replace the bearing, as well. If it has seals on both sides, as some do, remove the tin on the inside face before installation.

08-09-2014, 06:03 PM	#14
timdhawk Member Join Date: May 2014 Location: Billings, MT Posts: 49	Re: Broken tooth on main drive gear - replace? Talked a lot with Mac Vanpelt. Found out the teeth in mine were 29 and 15 rather than the "normal" 28 and 16... (49 Merc 3 speed w/ OD). I will be replacing with a 15 tooth MDG and keeping the 29 tooth cluster gear. If bearing is good w/o any grabbing, grinding or free play should I still replace it? How do you know if they are bad if they aren't "obviously" bad? Also, fill the new kid in... what's the "Rule of 44"?

08-09-2014, 06:07 PM	#15
Mike B Senior Member Join Date: May 2010 Location: Oakdale,Ca Posts: 1,323	Re: Broken tooth on main drive gear - replace? I think it's referencing total tooth count should be 44 29 + 15 28 + 16

08-09-2014, 06:11 PM	#16
svm99 Senior Member Join Date: May 2010 Location: Garlic Country of CA Posts: 537	Re: Broken tooth on main drive gear - replace? 15T Input + 29T Cluster=44, 16 + 28=44, 18 + 26=44 Just a bit info for trans guys. Paul J.