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Old 03-07-2003, 07:49 PM   #1 (permalink)
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Birfield Question

We pulled apart the front of a 76 (disk brake Cruiser) and found that one of the birfields was starting to crack in 4 places and probably would have broke on the next trail run. We have a set of birfields out of what was said to be 76 but the measurement from the bell out to the end of the splines is shorter by like a 1/2". Both of them have the same number of splines and the length is the only differance we can find. Will they work or what is the deal? Any help would be greatly appreciated.

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James
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Old 03-07-2003, 08:11 PM   #2 (permalink)
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Yes they will work, kinda. You won't be able to reinstall the c clip in the locking hub because of the shorter stub length. Get a bolt, 8mm I think, and a fender washer. Run this in the end of the stub after you install the locking hub body.

But, this depends on which locking hubs you are running. Do it, if the clip fits, be happy! Otherwise use the bolt and washer.
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Old 03-07-2003, 08:27 PM   #3 (permalink)
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Thanks Mike, We will give it a shot tommorow and see if we can make it work.

Thanks again,
James
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Old 03-07-2003, 09:37 PM   #4 (permalink)
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Sounds like you have minitruck birfs as your "76" spare. It will work, but you will have to grind the housing a tad for it to fit. Been there.
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Old 03-10-2003, 08:41 PM   #5 (permalink)
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i think the difference is around 76-78 there was a few birfs (fine spline) where the actual outer birf length was longer, due to the hubs being run

it was an older warn style locking hub (option)
factory turn thingy was standard i think

they are a weird birf, but if you are keen run the locking hub from the same model and it bolts to your "hub" i have used these, but the older style hub is NOWHERE near as strong as the minitruck hub

the birfs are similar in strength: i.e. they break get longfields!
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Old 03-10-2003, 11:11 PM   #6 (permalink)
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BJ,
In the US, we saw those longer birfields from 1976-1978 cruisers like you stated. Meant mini-truck or post 78 L/C birfs but typed slower than I think. Eitherway, the "short" birf's will require a bit of grinding in the knuckle ball to fit. and wont work with the early style Aisin(ASCO) locking hubs due tothe length difference unless you dont use the snap ring and simply use a fender washer and 8mm x 1.25 bolt
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