Ring gear bolt shoulders to large to go through ring gear flange on sure grip.

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cpearce

cpearce

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I am in process of setting up a 3.23 gear set on a 1967 powrlok sure grip unit. Everything was going fine until I was putting the ring gear bolts in and
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found the new ring gear bolt shoulders are too large for holes in ring gear flange on the sure grip unit. I am using a new Motive Gear kit with new bolts. I looked in parts bin and found some old ring gear bolts out of an open carrier I had, they also do not fit. What gives? Were there different sizes ring gear bolts?
 
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Are there different bolt sizes for different carriers? I've rebuilt only two other center sections myself, this is first time I've encountered this issue. So far I've not found any info on Google.
 
don"t recognize the bolt head style or the shoulder

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The bolts are TOO large? I see that they have shoulders below the hex. I just tore down a 3rd member TOO. They were the same size shank from the hex TO the end.
 
You have the wrong bolts.
 
You might tap that ring gear down and see if the bolts go through the carrier. A 0-1" barrel mic will tell you the size difference between threads and shank.
 
The diameter on the shoulder of the Motive Gear bolts is larger than the holes in carrier. The original bolts I had from another diff I have (1974 open 489), also have a shoulder too large for the holes in sure grip carrier. The bolts are approximately .020 too large at shoulder. We are thinking of drilling the holes out in the carrier.
 
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Kern Dog said:
The bolts are TOO large? I see that they have shoulders below the hex. I just tore down a 3rd member TOO. They were the same size shank from the hex TO the end.
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Thanks for the grammar lesson, looks like I forgot one o on the original post. I have fixed for you.
 
For everyone's information, I just spoke with Cass Eslick aka Dr. Diff who solved the mystery.

In 1969 Chrysler changed the bolt style and carriers to the shouldered size that comes in all the current kits, the 68 and older size bolts are no longer produced. The solution is to drill the holes larger in the 68 and earlier carriers.
 
I do not drill all the way through. Measure the shank length and add .030, doing so keeps the ring gear centered.
 
mderoy340 said:
I do not drill all the way through. Measure the shank length and add .030, doing so keeps the ring gear centered.
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the bolts do not center the ring gear -- they only clamp it to the carrier -- the shoulder that fits the I.D. of the ring gear on the carrier centers the ring gear.
 
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