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09-12-2014, 05:33 PM | #1 |
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Join Date: Apr 2011
Posts: 319
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'40 merc pinion question
I have a '40 mercury rear that I'd like to use in a '36 ford. I was told the merc has the pinion gear permanently attached to the driveshaft. Was it welded to it or removeable? How can I use this 3.54 in a shorter wheelbase car?
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09-12-2014, 06:21 PM | #2 |
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Join Date: Jun 2010
Location: San Antonio, Texas
Posts: 16,420
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Re: '40 merc pinion question
The shaft is a part of the pinion and is not removeable unless it is cut. Depending on the diameter of the shaft, it may be possible to remove the long shaft portion and have a machine shop cut some splines back into it to mach a standard Ford 6-spline pinion. I've never tried it but it could be worth looking into with the price of the new ring & pinion gear sets. it may not be large enough for 10-spline though but I just don't know without comparison
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09-12-2014, 07:12 PM | #3 |
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Join Date: May 2010
Location: Mill Valley,Ca.
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Re: '40 merc pinion question
The machine shops I contacted all wanted a lot of cash to cut splines onto the shortened shaft...
Except for Mitchell Overdrive. I would contact them. I was told that they set up to do the spline cutting operation once in a while- you may have to be patient... I found it comforting that they do this as a regular practice. Karl |
09-12-2014, 09:08 PM | #4 |
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Join Date: May 2010
Posts: 143
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Re: '40 merc pinion question
I've done several sets,always 6 spline,and it works out great.Plus the orig ford/merc gears are superior the the aftermarket stuff . My guy gets $150.00 to spline the pinion stub .Bob
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09-12-2014, 11:12 PM | #5 |
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Join Date: Jul 2014
Location: Iowa
Posts: 1,634
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Re: '40 merc pinion question
When we adapt an early driveshaft to a later pinion, we use an adapter. We cut the shaft in our long bed lathe, then turn the adapter to a slip fit. The whole assembly is chucked in the lathe, then welded. Cutting splines is a very complicated and expensive job, so using the adapter makes less cost, and a quick turnaround.
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09-13-2014, 01:19 AM | #6 |
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Location: Oxford New Zealand
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Re: '40 merc pinion question
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09-13-2014, 12:17 PM | #7 |
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Join Date: May 2010
Location: Encino California, near Burbank
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Re: '40 merc pinion question
Hard to imagine that machine work and other handling expenses could be a better idea than buying aftermarket gears. Declaring that the original gears could be superior seems like a shoot from the hip opinion, difficult to prove. 3.54 gears are no longer a premium item. Many guys are finding that 3.27s make great road gears where other gearing and torque producing issues are addressed. I does however sound like a great boast to make over the bench. Good Luck: Fred A
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09-13-2014, 04:20 PM | #8 |
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Join Date: May 2010
Location: Gerrardstown, WV
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Re: '40 merc pinion question
I have a Merc rear that is surplus.
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