(800) 853-2651
SHOP NOW

gear ratio

B

bob kyllo

New User
hey guys can any one tell me what the gear ratio is in the farmall h. specifically 1st 2nd 3rd and 4th gear. also whats the rear end ratio. my engine is shot and the clutch is shot also so i thought i would put a car motor in along with a manual car tranny mated up to the original farmall h tranny. but i need to know the gear ratio first to determine if this tractor would still be useable.

thanks guys
bob
 

The H frame rails are too narrow to accept most car engines unless it might be a very small 4 cylinder, and even then you need to adapt it to the original H flywheel so that you can use the starter because, once again, the frame rails are too narrow to allow the transplant engine starter to fit.

Unless you are building a hot rod of some kind, you would be much better off to rebuild the original H engine and buy a new clutch and pressure plate.
 
Found these pictures somewhere this summer. Seems like a lot of work, I think it might be easier to rebuild what you have. Parts are cheap, clutch is cheap, and it all fits.
a29937.jpg

a29938.jpg

a29939.jpg
 
no no guys i am going to save the tractor tranny along with adding a second tranny. but what i need to know is what is the gear ratio of the tractor its self. i would like to know what the 1st 2nd 3rd and 4th gear ratio is of the tractor.
 
(quoted from post at 22:51:04 01/14/11) I do not know much about 6 cyl gassers (mostly v-8's) but it doesn't look like a GM engine. What is it?

CT
Click to expand...

Look at the block right behind that rubber fuel line. It is clearly stamped "GM".
 
(quoted from post at 06:45:06 01/15/11) no no guys i am going to save the tractor tranny along with adding a second tranny. but what i need to know is what is the gear ratio of the tractor its self. i would like to know what the 1st 2nd 3rd and 4th gear ratio is of the tractor.
Click to expand...

I don't know the ratios, and I doubt if they are published in any book, but in years past when the hot rod tractor pullers made a frankenstein tractor like you are proposing to do, they used a 3 speed manual car transmission and locked it into first gear. This provided enough gear reduction to allow the engine to run at high enough RPMs so it would actually make some power, without creating too much speed at the rear wheels. Also, in order to make enough room for both the car engine AND secondary transmission, the tractor chassis needed to be stretched out to nearly TWICE its original length, which pretty much rendered the tractor totally useless for anything BUT tractor pulling. Take a good look at the photo that someone posted, and pay attention to how much LENGTH has been added to just the hood, and then also note that the tractor DOES NOT have an auxiliary transmission, which would create the need for the tractor to be stretched out even further.
 
In the following when I list 2 gear teeth numbers the first # will be driving the second #.
You can do the math. Trans input and constant mesh gear. 18-55. Ring & pinion 16-49. Bull pinion and bull gear. 12-66. First gear 23-47. Second gear 28-42. third gear 31-39. Fourth gear 35-35. Trans. gears are for a H with standard trans. gears.
 
I believe you are over thinking the problem. I really doesn't make any difference what all the ratios are as long as you run the input shaft at 1600 RPMs when you are at your loaded engine speed. If you do that all the tractor speeds will be correct along with the PTO and belt pulley. High idle for the H is 1815 and low idle is 450.
 
You must log in or register to reply here.

Similar threads

Z
Farmall 656 transmission overhaul--should I replace bearings if they seem ok?
Replies
7
Views
488
Greg Reed
G
J
Farmall M gear change
Replies
6
Views
1K
560Dennis
560Dennis
A
3rd and 4th gear shift not staying engaged
Replies
1
Views
141
pomester
P
2
ring gear
Replies
6
Views
467
2 Fingers
2
P
5610 8x4 syncro pops out of gear.
Replies
0
Views
282
peckens
P
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top