(800) 853-2651
SHOP NOW

600 vs 800 rear axle ratio

M

markct

Well-known Member
I have been wondering if the 800
tractors had lower gears to make up for
the larger tires. I have an 800 rear end
on a 600 tractor and it's seems slightly
slower so it got me wondering
 
Havent actually counted teeth, but here is a chart from a manual that seems to support your hypothesis of different ratios.

Jeff

42964.jpg
 
Interesting, so it would seem that even
with the larger tires the overall speeds
are slower on those tractors, thus a
lower rear end for sure. I have the
smaller 600 size tires on it so it's
definitely slowed down a fair bit.
 
Looking at Machnegative's "ground and engine speeds", I would think the point of comparison is direct drive forward, in other words, what is the ground speed in high gear.
Model 640 is 13.67 MPH, model 650/660 are 14.73 and model 850/860 are 14.10.
I don't know what the original tire sizes were, but to me it appears that the 650/660 had the same ring and pinion as the 640, just larger tires. Then the 850/860 either had shorter tires or lower gearing.
 
Got to looking at the same page in the 600/800 manual as above in the 2000/4000 manual and found the same info on rear end ratios. Just a little lower ratio in the 800 series.
42984.jpg
 
This may or may not be helpful but an observation. I have both a 2600 and 4100, both 1978. Despite having smaller tires, the 2600 is way faster.
 
word of caution: don't get too hung up on ground speed. I have two virtually identical 8Ns and one always travels faster than two. Identical tires, even brand/age, identical transmission and differential gears.......reason is that governors do not govern tho same speeds. On later tractors, all optional transmissions do not have identical gearing, either.
 
You must log in or register to reply here.

Similar threads

B
Ford 800 value
Replies
15
Views
611
showcrop
showcrop
D
Ford 4600 fwd transfer box issue
Replies
18
Views
809
DavyH
D
M
1939 PTO shaft
Replies
5
Views
399
MarkWisconsin
M
1
800 Series Hitch Question
Replies
12
Views
1K
1st440Crawler
1
R
800 Case Injection Pump timing
Replies
5
Views
725
mEl
mEl
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