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Show Parts for Model:

$1400.00 for SOS Input Shaft

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07-03-2001 14:29:29

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Back in early spring I had posted that I needed to split my 4000 to investigate a clutch/input shaft problem It turned out both need to be replaced. I want to thank all who responded with excellent information. Especially about tilting the trans/differentall up and removing the input shaft verticually. It worked like a charm! I stopped at the local Ford dealer to price what I needed. The input shaft, with the sealing rings was $1400.00. The clutch disc with the hub was $360.00. I thought maybe the shaft would have been half that much. Anyway, are there any other places to look beside the Ford dealer? As soon as I heard the price, I started to run possable repair ideas through my head. Has anyone tried to repair one? I always look at ways of repairing instead of buying new if at all possable. Thanks for your help.

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12-18-2002 16:09:24

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
I have run select-o-speed tractors for 35 years and we take the following action to repair input shafts when the splines have gone. Weld 2 dogs onto the shaft at 180 degrees to each other. The dogs should be about 3/8" wide x 1/2" long. Cut corresponding slots in the clutch shaft and re-assemble.
Down-time for this repair is little more than half a day. Cost is minimal. If the repair goes again (we have not lost one yet) then weld it again.
To avoid the torque-limiting clutch centre breaking, weld a strengthening disc about 1/8" thick onto the original centre BEFORE BREAKAGE. Welding before breakage keeps the lining true. Weld only about 1/2" at a time and then allow to cool to avoid distortion. We have never had a clutch centre breakage after having this mod from new.

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John-thanks for your help

07-04-2001 06:04:47

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
You are all suggesting the direction I was thinking about, welding and cutting new splines. I have machining and welding background plus access to a great machine shop. I always get great satisfaction when able to make an unsual fix. I would probably have to buy the spline cutter and the broach for the internal splines. The idea of the impact socket is intriging. What would the general thought be about the strength of a hex sided shaft verses the splines? Certaintly would make machining easier!

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George H--Bern/input shaft repair link

07-04-2001 10:18:24

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 Re: Re: $1400.00 for SOS Input Shaft in reply to John-thanks for your help, 07-04-2001 06:04:47  

The link is to a discussion between Bern and Steven Richmond, who has resplined an SOS input shaft. I would suggest checking big-city Yellow pages under 'Machine shops' and 'driveline/driveshaft repair and fabricating'.

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Bern (thanks George!)

07-04-2001 11:58:09

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 Re: Re: Re: $1400.00 for SOS Input Shaft in reply to George H--Bern/input shaft repair link, 07-04-2001 10:18:24  
Thanks George for taking the time to search the archives on that one.

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George H--Steven Richmond link

07-04-2001 10:37:03

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 Re: Re: Re: $1400.00 for SOS Input Shaft in reply to George H--Bern/input shaft repair link, 07-04-2001 10:18:24  

This link is to Richmond Labs, and has a picture of the resplined input shaft. Scroll down to "Full Machine Shop...".

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Rod MI

07-03-2001 22:41:38

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
I bet a high performance axle manufacture for drag racing and street strip cars could weld and re-cut the spline for you but you mite have to buy the cutter if it is not a standard size the custom axles they built for my brother were first class in every way and about $200.00 I cant think of the name now but if any one is interested Email me and I will post the Name it is a very popular manufacture

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Bern (regulars, we need your help)

07-03-2001 21:39:40

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
There's an outfit on the east coast somewhere I believe that will take those shafts and weld them back up and re-spline them for fairly reasonable amount of money. I don't have the name and number here in front of me. If you're interested, let me know and I'll have someone try and dig up the info on that. Actually, do a search through the archives here. The more I think about it, it seems to me that the way I found out about this guy was that he announced his capabilities here on this board. Maybe some of the other regulars on the board here remembers seeing that post? I'm thinking it was about 2-3 years ago now.

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07-03-2001 21:09:21

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
At the SOS seminar held at the Ford Fordson nationals in Indy a coupla years ago the cheap fix being presented was to weld an impact socket to the clutch hub and build up the shaft and have it machined to a hex to fit the socket.

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David Tiefenbrunn

07-03-2001 18:18:07

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 Re: $1400.00 for SOS Input Shaft in reply to John, 07-03-2001 14:29:29  
I ordered the clutch disk from the local Ford dealer and thought $175.00 was high. I had a spare input shaft, so I never asked the price for one. A local used parts place had a few of them, and they go about 1/2 dealer price, down for less than pefect condition. The planetary gears I bought there were in excellent shape, and since I seached through the drum of oil & parts, I paid even less.

I have considered the following, as I figure if I wear out another input shaft, I will have more trouble finding a usable one years from now: If the rest of the shaft is good, grind off the bad splines and build up with new metal by welding. Heat treat to relieve stress. Have new splines cut. Ideally, do this to both hub and disk, using modern spline design that is stronger.

I did this for the swing pivot on my IH 3800 backhoe. It cost $500.00 for the (inner and outer together) spline cutting at a local machine shop. That was roughly 3" diameter.

I don't know the "technical names" of the types of splines, but the original on my input shaft and the backhoe pivot were the type that are "V" shaped. The new ones are square shaped, like ACME screw threads. The new splines on the backhoe are not showing signs of wear.


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