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  #1  
Old 07-02-2012, 06:48 AM
3414 3414 is offline
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Potential problem on T98A & parts search

Well, speedometer quit working on one of the F600s (1960) Started checking things and the cable was OK. When I disconnected the cable I noticed the output housing on the transmission (a T98A) was loose and rotated a bit. All bolts holding it on were less than finger tight. Dropped driveshaft, removed parking brake assembly, and removed output housing. The speedometer driven gear was stripped. But the drive gear looks very good.

If you have a T98A four speed transmission with a transmission mounted parking brake, you might want to check that your output housing bolts are not loose. It looks like as the housing rotates that little bit to take up the bolt to bolt hole clearance it is enough to let the speedometer driven gear disengage enough to lose mesh and start stripping.

Reassembled everything, and all I need now is a new speedometer driven gear. Old one is a 20 tooth, part number 01T 17271C, but going by the parts book, with the axle ratio and tires I have I should be using the 21 tooth 01T 17271D. I have done some looking, but have not found one yet. Anyone have any ideas on where to look?
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Old 07-02-2012, 08:54 PM
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Dennis Carpenter sells a 20 tooth but don't know if it's what you need!

http://www.parts123.com/parts123/yb.dll?parta~partsort
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Old 07-03-2012, 05:54 AM
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Thanks.
I checked several places, and no one had the 21 tooth, but I found a 20 tooth at Antique Auto Supply. I eally wanted to find the proper combination of drive and driven gears to get a good speedometer reading, but no one that I called had what I am looking for. But at least the 20 tooth will give me a working speedometer.

I just wish I had found the loose bolts before the gear stripped.
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Old 07-03-2012, 06:46 AM
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Very common problem on many trucks with the transmission mounted parking brake. My belief is that's caused by not coming to a complete stop before you reef on the parking brake. When you do stop doing that, you will notice the torsional twist in the driveline causes the truck to rock fore and aft a couple times and all that movement is going right to those mounting bolts.
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Old 07-04-2012, 06:44 AM
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Quote:
Originally Posted by 3414 View Post
But but going by the parts book, with the axle ratio and tires I have I should be using the 21 tooth 01T-17271-D

I have done some looking, but have not found one yet.
How many would'ja like?
Note: When you have a part number prefix that begins with a ZERO, it can also be typed as the letter O.

Some sources list these part numbers twice on parts locator sites, with the ZERO and with the O, some do not.

O1T-17271-D =

JST AUTOMOTIVE in Lebanon TN has 1 = 615-443-3086.

WESLEY OBSOLETE PARTS in Liberty KY has 1 = 606-787-5293.

GRIESEL MOTOR CO. in Okarche OK has 1 = 405-263-7242.

HERGERT FORD in Perryton TX has 1 = 806-435-7676.

KINSEL L/M in Beaumont TX has 2 = 800-816-2894.

PARTS INTERNATIONAL in Farmers Branch TX has 2 = 888-414-4462.

DON SANDERSON FORD in Glendale AZ has 5 = 623-842-8643.

GREEN SALES CO. in Cincinnati OH has 5 = 800-543-4959.
--------------------------------------------------------
01T-17271-D =

JST AUTOMOTIVE has 1. Prolly the same puppy as the O.

ANTIQUE AUTO SUPPLY in Arlington TX has 7 = 817-275-2381.

btw: P/M sez 23, found 3 more, tossed them in for sheets & giggles.
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Old 07-05-2012, 04:51 AM
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Thank You.

Funny thing is that the first place I contacted was Green Sales, and they did not have it. I never thought to use o instead of zero, as in the materials that I have it sure did look like a zero.
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Old 07-05-2012, 05:25 AM
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Originally Posted by 3414 View Post
Thank You.

Funny thing is that the first place I contacted was Green Sales, and they did not have it. I never thought to use o instead of zero, as in the materials that I have it sure did look like a zero.
Zero is correct, but most parts people pronounce zero as oh, so the part number is typed into parts locators that way.
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Old 07-10-2012, 06:19 AM
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Well, all the parts came in and I put everything back together. Speedometer worked great for about a half mile, then started jumping wildly, then quit. Now to start taking things apart again to see what is going on. Going to start at the speedometer and work my way back. (by the way, everything was lubed, and no sharp bends in the new cable)
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Old 07-16-2012, 07:49 AM
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Well, had only a little time over the weekend to get into this. Removed new seedometer cable - it was seized solid, core would not turn or move. Put the old speedometer cable back on (it still turned ok) and speedometer did not work. Now to tear everything apart again.
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Old 07-16-2012, 01:10 PM
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Inside the speedometer cable housing is a woven steel core, it's supposed to be lubed every so often.

When the lube dries out, the woven steel core binds up inside the housings and snaps.

Autoparts stores sell a 'universal' woven steel core kit. Cut it to length, coat with graphite (or as original-white lithium grease), install in housing. Problem solved.
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Old 07-17-2012, 04:54 AM
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Thank you for the tip NumberDummy. This cable is too far gone - I cannot even pull the core out, I think it might have "birdcaged" inside the housing.

I used a graphited oil to lube it, just as I have always done, and it spun nicely by hand, but once I started driving it went bad.
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Old 07-17-2012, 04:54 AM
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