Transmission strength

Farmall Cub Forum -- Questions and answers to all of your Cub related issues.

Moderator: Team Cub

Forum rules
Notice: For sale and wanted posts are not allowed in this forum. Please use our free classifieds or one of our site sponsors for your tractor and parts needs.

Transmission strength

Postby farmboy99 » Sun Dec 14, 2008 11:27 pm

I am currently in the middle of a conversion, I am going to mount a v-6 on to a 1948 farmall cub that we are currently restoring. My question is how stong is the tranny? The main reason we are building this tractor is for sled pulls, so it will see a beating. I just dont want to finish the tractor and have to tear it down because i blew the tranny up on the first pull.
farmboy99
5+ Years
5+ Years
 
Posts: 4
Joined: Sun Dec 14, 2008 11:20 pm

Re: Transmission strength

Postby Former Member » Mon Dec 15, 2008 2:19 am

From all that I have read here, and all the advice i have gotten, It is not the tranny you need to worry about near as much as it the final drives and their housings.
Former Member
5+ Years
5+ Years
 
Posts: 6416
Joined: Tue Jan 29, 2008 10:56 pm
Zip Code: 00000
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby Lurker Carl » Mon Dec 15, 2008 4:09 am

Dale has an excellent point. The castings and driveline on a Cub are designed specifically for 13 horsepower and 40 ft/lbs torque delivered at 1800 rpms from the flywheel. You'll discover most components are not robust enough to handle 120 horsepower or 130 ft/lbs torque or 4500 rpms.
"Chance favors the prepared mind."
- Louis Pasteur

"In character, in manners, in style, in all things, the supreme excellence is simplicity."
- Henry Wadsworth Longfellow
User avatar
Lurker Carl
Team Cub Mentor
Team Cub Mentor
 
Posts: 3939
Joined: Mon Feb 03, 2003 9:54 am
Location: PA, Todd
Zip Code: 16685
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby bob in CT » Mon Dec 15, 2008 4:44 am

You might get a better answer here: http://gardentractorpullingtips.com/index.htm or here: http://www.midwestsupercub.net/trans_parts.htm

They run 50HP through the garden tractors and have lots of speed parts for the gearbox and rear end. Same gearbox. Trick gears, shifter forks, automotive rear end, ....You will be on your own with the final drives, but at least you will be talking the same language.

have fun.
User avatar
bob in CT
Cub Pro
Cub Pro
 
Posts: 5239
Joined: Thu Jun 07, 2007 9:34 am
Location: CT, Manchester
Zip Code: 06040
Tractors Owned: 77 Cub (red); 74 Cub; 52 Cub; 50 Cub ( post-demo)
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby Rick Prentice » Mon Dec 15, 2008 7:39 am

When I stuck the Chrysler V-6 in "Harley"(143hp), the first thing I did was buy some extra gears "just in case". I did take Harley to Bigdog's CubTug and pulled the sled, but never ran the engine hard. Just enough :D :D There's no doubt in my mind----If you "pour the coals" to the cub's components, you'll scatter something :( That long input shaft bends easy, the trans gears are small, and things aren't balanced enough for high rpms.

Let's see some pictures. What engine are you using?

Have fun with the project. You'll get alot of replies from people at shows, some good :D , some not so good :( .

Rick
When I told my dad I've been misplacing things and doing stupid stuff----His reply---"It only gets better"
User avatar
Rick Prentice
Team Cub Guide
Team Cub Guide
 
Posts: 5359
Joined: Mon Nov 01, 2004 7:24 am
Location: OH, Grand Rapids (historical town along the Maumee River)
Zip Code: 43522
Tractors Owned: 47(circle cub),48(Floyd),49,50demo from GW's collection),51,52(backhoe),53,54,55(Nickles)
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby Bus Driver » Mon Dec 15, 2008 7:43 am

Metal fatigues when stressed. Even if 100 HP does not break the transmission immediately, that stress will rapidly age the components and failure will occur much sooner than it would at lower stress/torque levels. Expect it to be a high-maintenance machine.
Luck favors those who are prepared
User avatar
Bus Driver
Team Cub Mentor
Team Cub Mentor
 
Posts: 2650
Joined: Sat Feb 11, 2006 5:26 pm
Location: NC

Re: Transmission strength

Postby Larry Barb Dotson » Mon Dec 15, 2008 8:19 am

Will the Cub drive train handle a 20 HP diesel?

Larry Dotson
User avatar
Larry Barb Dotson
10+ Years
10+ Years
 
Posts: 216
Joined: Thu Dec 25, 2003 7:03 pm
Location: Oh. Bellefontaine

Re: Transmission strength

Postby Rick Prentice » Mon Dec 15, 2008 8:36 am

Everybody knows you can't fit a diesel into a cub :( . It'd look stupid and out of place :D :D

Rick
When I told my dad I've been misplacing things and doing stupid stuff----His reply---"It only gets better"
User avatar
Rick Prentice
Team Cub Guide
Team Cub Guide
 
Posts: 5359
Joined: Mon Nov 01, 2004 7:24 am
Location: OH, Grand Rapids (historical town along the Maumee River)
Zip Code: 43522
Tractors Owned: 47(circle cub),48(Floyd),49,50demo from GW's collection),51,52(backhoe),53,54,55(Nickles)
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby Clark Thompson » Mon Dec 15, 2008 10:13 am

The cub and all the farmalls were way overbuilt. The drivetrains were especially strong. The cub drivetrain is very strong. The reason that the finals failed is mostly because of coming loose or hitching to the wrong place on the tractor to pull. as long as you hitch to the drawbar I doubt the finals will give out. All the finals I have had brake were due to coming loose or the owner was hitching to the improper place on the tractor allowing the finals to rip themselves from the tractor. I would say that the weakes point would be the clutch. I would assume that with converting a V6 to a cub you would also install or beaf up the clutch.The second weakest point would probab;ey be the driveshaft.
Collector of Farmall cubs and cub cadets.Injoy helping people keep their cubs running. Years of experipnce.
Clark Thompson
10+ Years
10+ Years
 
Posts: 1485
Joined: Sun Feb 02, 2003 11:01 pm
Location: Hubbard Ohio

Re: Transmission strength

Postby Steve Butram » Mon Dec 15, 2008 11:25 am

Rik Prentice Wrote
Everybody knows you can't fit a diesel into a cub


I agree with you Rick a diesel engine in a cub would look funny. :lol:
Co- hosting Central Indiana Cub Fest near Tipton Indiana September of 2014
User avatar
Steve Butram
Cub Pro
Cub Pro
 
Posts: 1904
Joined: Mon Feb 17, 2003 7:53 am
Location: IN West Lafayette
Zip Code: 47906
eBay ID: steveb05
Tractors Owned: 1947 in well used condition
1948 restored
1948
1949 for sale
Nice original 1950 just out of the Demo Range
628 2 wheel Trailer
1950 Demo
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby farmboy99 » Mon Dec 15, 2008 12:06 pm

Thanks guys for all the response, as far as the drive shaft I was going to have a new one machined to fit up with the new clutch. I was thinking a ford 4.0 but that might be a little big. And Im already up setting my brother... hes a purest in a way. For his senior project in high school he restored a farmall b. Ill try to post up some pics tonight.
farmboy99
5+ Years
5+ Years
 
Posts: 4
Joined: Sun Dec 14, 2008 11:20 pm

Re: Transmission strength

Postby farmboy99 » Mon Dec 15, 2008 12:07 pm

Rick Prentice wrote:Everybody knows you can't fit a diesel into a cub :( . It'd look stupid and out of place :D :D

Rick


I think that you could fit a 4bt cummins in it....
farmboy99
5+ Years
5+ Years
 
Posts: 4
Joined: Sun Dec 14, 2008 11:20 pm

Re: Transmission strength

Postby Barnyard » Mon Dec 15, 2008 1:20 pm

Larry Barb Dotson wrote:Will the Cub drive train handle a 20 HP diesel?

Larry Dotson

:bellylaugh:
Who would ever want to do that to their Cub? I agree with Rick.
It is common sense to take a method and try it. If it fails, admit it frankly and try another. But above all, try something.
- Franklin D. Roosevelt -

Barnyard Bash CubFest May 30th - May 31st, 2014
Click here for info http://www.barnyardbash.com
http://www.Savethecub.com
User avatar
Barnyard
Team Cub
Team Cub
 
Posts: 17873
Joined: Tue Aug 07, 2007 3:39 pm
Location: OH, New Haven (Hamilton County)
Zip Code: 45030
Tractors Owned: At This Time
40 Farmall Cubs (Round Hood)
2 Farmall Cub (Square Hood)
2 IH Cubs (Square Hood)
5 Lo-Boys (Round Hood)
2 Lo-Boys (Square Hood)
2 Farmall 404's
1 Farmall H
1 Ferguson 20
1 Cub Cadet 125
1 Kubota B-7100
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby George Willer » Mon Dec 15, 2008 2:21 pm

farmboy99 wrote:Thanks guys for all the response, as far as the drive shaft I was going to have a new one machined to fit up with the new clutch. I was thinking a ford 4.0 but that might be a little big. And Im already up setting my brother... hes a purest in a way. For his senior project in high school he restored a farmall b. Ill try to post up some pics tonight.


1. There would be no advantage to machining a new drive shaft... the current one is a match to the rest of the drive line and plenty strong. Keeping it as original would at least make replacement possible without breaking the bank. Machining accurate splines on a replacement (both ends) would be VERY expensive, and nothing would be gained!

2. As long as the load is applied to the standard drawbar it's not really all that far from the center line of the axle. The final drive housings aren't under a lot of eccentric load.

3. The amount of loading for the drive line is limited by traction. Don't try to pull a Cub in the heavy classes by adding excessive weight. :( Wheel spin is good. :lol:

4. Furthermore... As everyone already knows it's not even possible to convert a Cub to diesel neatly. :mrgreen:
George Willer
http://gwill.net

The most affectionate creature in the world is a wet dog. Ambrose Bierce
User avatar
George Willer
Cub Pro
Cub Pro
 
Posts: 7011
Joined: Sun Feb 02, 2003 9:36 pm
Location: OHIO, Fremont
Zip Code: 43420
Circle of Safety Award
Circle of Safety: Y

Re: Transmission strength

Postby Bill Hudson » Mon Dec 15, 2008 3:48 pm

Farmboy99,

Sounds like you have an interesting project in the works.

I noticed that you have only made 3 posts, so you may be wondering about the comments about a diesel in a Cub. My suspicion, based on earlier posts, is that a 'Stealth Diesel Cub' has been completed, or nearly so. Whatever it is has been seen by some but the masses are still waiting.

So enjoy your Cub conversion. There is a lot of knowledge out here. Feel free to tap into it.

Bill
"The probability of life originating from accident is comparable to the probability of the unabridged dictionary resulting from an explosion in a printing shop." Edwin Conklin, biologist
Bill Hudson
Team Cub
Team Cub
 
Posts: 6398
Joined: Wed Jul 26, 2006 10:50 am
Location: OH, Madison
Zip Code: 44057
Tractors Owned: :
57 F-Cub
64 Lo-Boy
68 Lo-Boy
52 F-Cub
Circle of Safety Award
Circle of Safety: Y

Next

Return to Farmall Cub

Who is online

Users browsing this forum: johnny j and 2 guests