Welcome! Please use the navigational links on your left to explore our website.

Company Logo Shop Now
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
Classified Ads
Photo Ads
Tractor Parts

Discussion Forums
Project Journals
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs

Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
Ford 8N/9N Club
Kountry Life
Case Tractors Discussion Forum

VAI - how to slow it down by changing gearing?

Welcome Guest, Log in or Register
Author  [Modern View]

09-27-2009 05:52:28

Report to Moderator

Contemplating changing the gearing to slow down my VAI to be more like a VA / VAC.

What exactly would I need to change? Pinion shaft and ring gear on differential only? Or do the Bull Gears need to be changed too?

Do I also have to change gears 1-4? I don't care if the speeds match the VA / VAC exactly, just want to be able to go slower overall.

I should add this would be my first time splitting a tractor. Just rebuilt the PTO and differential brakes, but didn't have to split the tractor for those. So pretty sure I could handle it unless there's all sorts of special tools required.

[Log in to Reply]   [No Email]

09-28-2009 20:36:01

Report to Moderator
 Re: VAI - how to slow it down by changing gearing? in reply to dpski, 09-27-2009 05:52:28  
If any of you guys have a set of 13/67 pinion and bull gears you'd like to part with please get in touch with me.


[Log in to Reply]  [No Email]

09-28-2009 18:59:49

Report to Moderator
 Re: VAI - how to slow it down by changing gearing? in reply to dpski, 09-27-2009 05:52:28  
Ughh, doesn"t sound like a whole lot of fun.

Here"s what I was able to find from the Case/IH website on the different part#"s.

I"m somewhat surpised that a difference of 3 teeth can make such a difference.

VAI Differential gears;

2 VT3725 Bull GEAR - final drive, 63 teeth 2 VTA-2514 Diff Brake Gear side, with bushings, 16 teeth (tractors before No. 5555000)
2 VTA2814 Diff Brake GEAR - side, with plug, 16 teeth (Tractors after no. 5554999) 1 VT3421 Ring GEAR, 43 teeth 1 VT3410 COUNTERSHAFT AND BEVEL DRIVE PINION

VA / VAC Differential Gears;
2 VT3422 Bull GEAR - final drive (66T) (44" - 80" tread on VAC)
2 VT3606 Bull GEAR - final drive (65T), Used on special mowing VAC 13 tractors with adjustable front axle after #5570000. 2 VT5467 Bull GEAR - final drive (67T) VAC 44" - 88" tread and VAO 15 (VAC, VAO) 1 VTA587 RING GEAR AND CENTER WHEEL ASSEMBLY W/SHAFT (Includes VT3457 shaft) (No teeth count listed?)
2 VTA2512 Diff Brake GEAR - side (Includes VT3479 plug and 2-VT3765 bushings) Tractors w/disc type brakes

[Log in to Reply]  [No Email]

09-28-2009 09:41:24

Report to Moderator
 Re: VAI - how to slow it down by changing gearing? in reply to dpski, 09-27-2009 05:52:28  
You can slow down the overall speed by changing the bull gears and side gears (brake shafts) to the ones used in the regular VAC with disc brakes. The bull gears will be 66 tooth and the side gears will be 13 tooth. The side gears in your tractor now should be 13 tooth also but it carries a different part # so I doubt it will work. You have to seperate the rear housing from the transmission to change the gears. Also takes some work to get the side gears and carrier shimmed back to specs but it is more time consuming than anything. We can change the bull gears in a couple of hours or less but we have had a lot of practice since we pull a VAC. End up spending a lot of time draining oil to prevent such a mess when you seperate them. Have had good luck with high temp copper sealant when reassembling instead of trying to get or make gaskets. It seems to work without having to let it set and cure which we usually don't have time to wait anyway. After you change the gears you still will not have the same 2nd or 3rd gear as the VAC because the transmission gears are different also, but this will help considerably with the speed overall.

[Log in to Reply]  [No Email]
[Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Log in to Reply]

Hop to:

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. [ About Us ]

Home  |  Forums

Today's Featured Article - Welding Basics - by Curtis Von Fange. One of the most useful skills that an owner of older equipment can have is the knowledge and ability to weld. It seems like the older equipment can do a job, albeit slowly compared to newer stuff, but it tends to break more often. Many of the breakdowns are related to the implements that are being used: the disc, wagon or bushog are among them. Knowing how to fix stress cracks, reinforce weak joints by welding on steel support plates, or cutting and shaping parts and adapters out of raw stee ... [Read Article]

Latest Ad: Looking for a useable engine head for 1929 McCormick deering 10-20 [More Ads]

Copyright © 1997-2021 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