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12-27-2014, 11:47 PM | #1 |
Senior Member
Join Date: Jul 2010
Location: Auckland, New Zealand
Posts: 513
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Diff. pinion cut down on threaded drive shaft
In fitting a Mitchell O/D to a members car, we found the pinion had no threaded portion and was retained on the drive shaft by smaller nuts on the driveshaft itself, which was threaded. See pics. attached.
Is this a "Farmer Fix", part of a different model Ford or what? Anyway it slowed us down because the Mitchell stub shaft is much thicker, so I would have to turn it down to thread it if we wanted to use the old pinion. Plus the Ring gear ("crown wheel" if you report to Her Majesty The Queen, as we do) doesn't look too good anyway. No questions, but thought this little setback might help other Barners fitting a Mitchell O/D, or has this been commonly found before? Happy New Year to all. SAJ in NZ |
12-28-2014, 12:59 AM | #2 | |
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Location: Queensland Australia
Posts: 640
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Re: Diff. pinion cut down on threaded drive shaft
Quote:
I have seen a couple of these over the years (mine included) not sure what is required to fit to a Mitchell Overdrive.
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12-28-2014, 01:06 AM | #3 |
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Join Date: May 2010
Location: Southern California
Posts: 3,122
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Re: Diff. pinion cut down on threaded drive shaft
What you have is a very early 28 ring & pinion gear set. The ratio is 370:1. This set up is not compatible with a Mitchell overdrive installation. What you are going to have to do is tear the rear axle assembly apart and locate and install the later 378:1 ring & pinion gear set.
For more information on this early gear set up go to the web site of the Santa Anita A's of Arcadia, California at santaanitaas.org. On the home page put your cursor on "Technical Reference". My name will appear below, click on it and it will bring up a menu of technical articles. Scroll to the one of differential rebuild revised 2014. It is a pdf file end you are welcome to download and print out. Tom Endy |
12-28-2014, 05:25 AM | #4 |
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Join Date: Jul 2010
Location: Auckland, New Zealand
Posts: 513
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Re: Diff. pinion cut down on threaded drive shaft
Thank you RUNNERBUN and TOM for your rapid replies. It comes back to me now. I will read your latest rebuild pages tomorrow. I followed your earlier publication 4 or 5 years ago to rebuild the diff. in my Roadster.
In the meantime, can I ask if we place a quick order to Snyders tonight (It is almost midnight here) for Ring, Pinion (3.78:1), cups, cones, shims gaskets, tab washer etc, will it all fit into the early diff housing I presume we have? The car is a late 1930 Phaeton, but who knows what has gone on over the years. The axle housings have powder coat over very deep rust pits and it looks like the rear axle was rescued from under a hedge before it went into this car Thanks again SAJ in NZ OK TOM, just read your article so I see we will be OK with all new parts Last edited by SAJ; 12-28-2014 at 05:33 AM. Reason: read the article |
12-28-2014, 01:52 PM | #5 |
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Join Date: May 2010
Location: Nelson. New Zealand
Posts: 1,999
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Re: Diff. pinion cut down on threaded drive shaft
SAJ replaced same unit in Dave Whites sedan some years ago here as destoyed it on some ruff road in the Molesworth , replaced d/shaft , ring & pinnion, i think that was all, Re your new parts required , why not support your local supplier, he will have in stock. & be open , Cheers Derek
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12-30-2014, 07:16 PM | #6 |
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Join Date: Jul 2010
Location: Auckland, New Zealand
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Re: Diff. pinion cut down on threaded drive shaft
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Many thanks. SAJ in NZ. |
12-30-2014, 07:23 PM | #7 |
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Join Date: May 2010
Location: Nelson. New Zealand
Posts: 1,999
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Re: Diff. pinion cut down on threaded drive shaft
No Problem . courier will collect today , might take few days being new year , Was talking to Ralph a couple of times , & look forward to catching up at the National meet in March. He will love his Mitchell, I have 4 arriving this week plus a transmission for custmer . one spare O/D if someone needs , Thanks Derek
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