Pulling Forum - Quick change gear shafts

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Quick change gear shafts

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Forum Name: Pulling Forum
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=117445
Printed Date: 03 Nov 2025 at 10:41pm
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Topic: Quick change gear shafts

Posted By: Bob C IL
Subject: Quick change gear shafts
Date Posted: 12 Jan 2016 at 7:17pm

Where do ya pick up splined shaft for quick change gears?

Replies:

Posted By: DrAllis
Date Posted: 12 Jan 2016 at 10:15pm

Which size? 1.250" x 10 splines ??

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 6:42am

Yes for winters gears

Posted By: DrAllis
Date Posted: 13 Jan 2016 at 7:22am

Gear Headquarters in Kansas City, Kansas can make you what you want.....John Lewman at 913-831-1700....I thought one could just buy a length of splined shafting ready to go, but I guess not. You'll want it made of 4140 or 8620 steel. I'm a little concerned that your choice in gears might not be strong enough for the torque you're going to run thru them.?? Gears from SCS or Pro-Fab I know are strong enough.

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 8:54am

Yes scs or profab. I was looking at a winters chart when I wrote that.

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 8:58am

Need a pair of 1to 1 and . 8 to 1

Posted By: DrAllis
Date Posted: 13 Jan 2016 at 10:57am

I'd ask SCS or ProFab first if they'd sell you some shafting. If not, call Gear Headquarters. Winters gears are for stock car rear axles and I don't believe are what you want.

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 1:33pm

Going to try to build my own overdrive box to put in my Tourque tube either work or it won't

Posted By: DrAllis
Date Posted: 13 Jan 2016 at 1:54pm

The overdrive ratio already inside the torque tube isn't good enough?? or too fast?? or too slow??

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 2:39pm

27.88 4 intermediate 22.15 4 high. Pretty good jump

Posted By: Bob C IL
Date Posted: 13 Jan 2016 at 2:55pm

I have run just ring and pinion for a couple years and is a little slow and burnnin the tires at the end!

Posted By: DrAllis
Date Posted: 14 Jan 2016 at 6:20pm

I'm thinking you need a .9 instead of .8 ....

Posted By: Bob C IL
Date Posted: 14 Jan 2016 at 6:30pm

Thanks for the help Doc! I get it drawled up and measures I'll post it

Posted By: DrAllis
Date Posted: 14 Jan 2016 at 6:42pm

I say that because the OEM is a 20% speed-up from direct to over-drive. For example 15.5 MPH to 19.3 MPH is 19.7%, so lets call it 20% even. I'd think you'd want to be half-way between there with a 10% increase and that's why I feel .9 to 1 over-drive would give you what you want.

Posted By: Bob C IL
Date Posted: 14 Jan 2016 at 6:56pm

I figure 25 to 1 and that had me at .899 when you do old math that I didn't do I should have rounded up at .9. I'm hoping to be able to change gear sets thru pd valve hole.

Posted By: MACK
Date Posted: 16 Jan 2016 at 9:27pm

How are you going to split shaft to get top gear off shaft?

Let me sell you one of my gear boxes and you just have to split it at front of trans. to change Ro. MACK

Posted By: DrAllis
Date Posted: 17 Jan 2016 at 6:53am

His tractor is a 7000. Might take some changes for your gearbox to fit ??

Posted By: Bob C IL
Date Posted: 17 Jan 2016 at 5:34pm

Yep Mack mines a 7000!! Leave it to me to build a freak. But I can say no rear end trouble so far.