axle splines

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Oct 11, 2011 | 08:30 PM

vettman

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Tuned

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axle splines

Can someone please tell me how to determine the number of splines on the rear axles of my Dana 70 differential. I have an OEM Dana 70, with 4.10 gears in my '76 F-350. Is this info stamped on the housing? on the tag?

Also, for this vintage Dana 70, will it be a "U", "B", or "HP"?

Thanks

Oct 11, 2011 | 09:14 PM

HIO Silver

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From: NorCal

I googled "Dana 70 bom" and came up with lots of hits. This seems to be a good one: Dana 70 Solid Front & Rear Axle info

"

Dana 70 Rear
Found under light pickup trucks info:

Splines: In my Spicer books all 67+ axle have 35 splines! Unless they are from a Ford F-350 truck with dual rear wheels. "1967-1975 Ford F-350's dual rear wheels & other" have axle shafts 34414-1 or 35368-1 and thus 23 splined 1.5" axle shaft. One note, they sure have a lot of No-Spins in them.

Dana 70 Facts: Axle Type: Full floating, carrier type housing and hypoid gears. Yoke: D70 has a 1350 flange (3-1-4041x) or a 1350 U-joint (3.4.5731x) or a 1410 U-joint (3.4.5711x) yoke for the drive shaft connection. Weight with out brakes 300 lbs. Torque: Max 7,000 Lbs ; Continuous 1,750 Lbs. Nominal GAW Rating 7,500 Lbs Wheel bolt patterns 8 on 6.5"
Dana 70 HD Facts: Axle housing tubes are 4 inch thick.WMS-WMS is between 70 - 50.75" Nominal GAW Rating 10,000 Lbs. Wheel bolt patterns Hub only 5 on 8.0" or Hub and Disk 6 on 8.75"

Wikipedia: Dana 70 - Wikipedia, the free encyclopedia

TheRangerStation: Dana/Spicer Bill Of Material Numbers

Good luck.

Oct 11, 2011 | 10:03 PM

montana_highboy

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Joined: Apr 2008

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From: Big Sky Country

Either 23, 32 or 35 spline, yours 'should' be a 35 spline unit as per the info above.

Oct 12, 2011 | 06:01 AM

Poison Oil Racing

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Joined: Nov 2007

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From: Montgomery, IL

if it is a full floater then you should be able to remove the axle shaft easily and count the splines, but I would go with 35.

Oct 12, 2011 | 07:23 AM

vettman

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Tuned

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Thanks for all the replies/good info. Now how do I tell if I have a Dana 70 B or U--I know it's not an HD. Is there a "plain" Dana 70 without a letter code?

Thanks

Oct 12, 2011 | 09:33 AM

vettman

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Tuned

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Here's a link to a Dana catalog for all their differentials used in '67 to '78 vehicles. Lots of good info. I'm not sure the URLs are hyperlinked correctly.

[URL="http://www2.dana.com/pdf/X510-