The Ford Barn

ursus · 08-29-2017, 04:16 PM

I am replacing a badly worn transmission main shaft with the currently available Mark brand of shaft and having trouble fitting my moderately worn Ford sliding gears. I am wondering if I just need to chamfer the spline edges on the new shaft, or? What is the secret to getting the gears on and sliding? Thanks!

Brian T · 08-29-2017, 04:59 PM

Hi Barry,
I remember the same thing using used gears with a new shaft, I smoothed the sharp edges on the shafts with some fine crocus cloth, something you would not be expected to do, worked just fine, no slipping out of 2nd on long grades.

RonC · 08-29-2017, 06:25 PM

Although expense replacing all the gears with new Mark Auto gears works well

Glen in Hillman MI · 08-29-2017, 06:57 PM

I also had the same problem. I tried all 3 available brands at that time with the same results. I ended up sanding .005 off the new shaft and the used original Ford sliders worked very well.

Larry Jenkins · 08-29-2017, 08:50 PM

Wouldn't it be nice if Vendors had gears to check on their new shafts before they ship? And, include a document saying they were tested and approved. Wonder how much more they would charge you..

But, don't you think good Vendors should do that as part of the final quality control process?

Big hammer · 08-29-2017, 09:45 PM

Sponsored Links (Register now to hide all advertisements)

That all part of rebuilding, measuring, fitting, testing, etc. They may make the shafts a little oversized to fit wornngears.

08-29-2017, 04:16 PM	#1
ursus Senior Member Join Date: May 2010 Location: Oregon Posts: 1,462	Transmission Main Shaft I am replacing a badly worn transmission main shaft with the currently available Mark brand of shaft and having trouble fitting my moderately worn Ford sliding gears. I am wondering if I just need to chamfer the spline edges on the new shaft, or? What is the secret to getting the gears on and sliding? Thanks!

08-29-2017, 04:59 PM	#2
Brian T Senior Member Join Date: May 2010 Location: San Diego,Ca Posts: 1,377	Re: Transmission Main Shaft Hi Barry, I remember the same thing using used gears with a new shaft, I smoothed the sharp edges on the shafts with some fine crocus cloth, something you would not be expected to do, worked just fine, no slipping out of 2nd on long grades. __________________ Nothing can be made foolproof, ---- fools are ingenious bastards. Last edited by Brian T; 08-29-2017 at 06:28 PM. Reason: Added text and redited

08-29-2017, 06:25 PM	#3
RonC Senior Member Join Date: May 2010 Location: Rhode Island Posts: 1,868	Re: Transmission Main Shaft Although expense replacing all the gears with new Mark Auto gears works well

08-29-2017, 06:57 PM	#4
Glen in Hillman MI Senior Member Join Date: May 2010 Posts: 107	Re: Transmission Main Shaft I also had the same problem. I tried all 3 available brands at that time with the same results. I ended up sanding .005 off the new shaft and the used original Ford sliders worked very well.

08-29-2017, 08:50 PM	#5
Larry Jenkins BANNED Join Date: Feb 2015 Location: East Central Iowa Posts: 1,275	Re: Transmission Main Shaft Wouldn't it be nice if Vendors had gears to check on their new shafts before they ship? And, include a document saying they were tested and approved. Wonder how much more they would charge you.. But, don't you think good Vendors should do that as part of the final quality control process? __________________ Good enough.. Isn't.

08-29-2017, 09:45 PM	#6
Big hammer Senior Member Join Date: Jun 2014 Location: Land of Lincoln Posts: 3,431	Re: Transmission Main Shaft Sponsored Links (Register now to hide all advertisements) That all part of rebuilding, measuring, fitting, testing, etc. They may make the shafts a little oversized to fit wornngears. __________________ Don't force it with a little hammer tap, tap, tap get a bigger hammer tap done