What sure grip do I have?

Ronald Weishaar

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I have a sure grip with the # 2070684 stamped on the ring gear' it has 2.76 stamped also. That's all I have! Can anyone tell me if this is a 7 1/4,8 3/4 , 9 1/4 or 9 3/4 sure grip? Or what do I need to look for to identify it?
 

ykf7b0

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I believe you can measure the inside diameter of the ring gear to get the size.
 

33 IMP

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Measure the diameter of the ring gear, at the point where it bolts to the sure grip. If you give us a pic, we can tell you if its a cone type or clutch..... or something else (unlikely).
 

beanhead

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8-3/4
A simple measurement of the O.D. of ring gear would confirm.
 
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beanhead

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I believe you can measure the inside diameter of the ring gear to get the size.

Measure the diameter of the ring gear, at the point where it bolts to the sure grip. If you give us a pic, we can tell you if its a cone type or clutch..... or something else (unlikely).
Not trying to be a smartass here, I love you guys...but they're measured from the outside diameter of the ring gear.
 

ykf7b0

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I believe you can measure the inside diameter of the ring gear to get the size.
I now believe I’m wrong and beanhead is correct with his suggesting a measurement of the outside diameter.
 

68 Sport Satellite

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Isn't there also a number stamped on the housing that will indicate size? I believe 8-3/4 had a few different numerical designations (I have a 742).
 

beanhead

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Isn't there also a number stamped on the housing that will indicate size? I believe 8-3/4 had a few different numerical designations (I have a 742).
If the carrier is still in the housing, then yes it's easy...I was interpreting the OP as having just the diff (separate) with the ring gear installed.
 

4speed68rt

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A couple of pictures would get you lots of responses from lots of people that would know.
 

WileERobby

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Ronald Weishaar

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I also measured the back side of the ring gear it was 8 1/4" the front was 8 3/4 which is the correct side measurement? And what type sure grip do I have? Thank you all sorry for being such a pain
 

beanhead

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It's an 8-3/4. Cone differential.

Here's another 8-3/4:

Measured at the carrier, 7 and just over 3/4"
20220806_084936.jpg



Measured at the bevel on the back of the ring gear, 8 and just over 1/4"
20220806_085149.jpg



Measured at the widest point--edge of the teeth-- 8-3/4" give or take a few thousanths
20220806_085218.jpg
 

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