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Old 06-25-2009, 12:29 AM
SteveH SteveH is offline
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Default Minitruck Aisin hubs on FJ40 axle?

I put a set of Aisin minitruck locking hubs on my '78 FJ40. It seemed like the snap ring under the hub dial was interfering with the hub dial fitting flush against the hub body. I seem to recall hearing about this and remembered people saying that the snap ring was not critical and that it was ok to leave it off. Is this true? Am I missing something about the snap ring and hub dial? I think the FJ40 axles have more stub end than the minitruck ones, thus the interference, right?

It sure was nice having the factory service manual to figure out how to reassemble the Aisin hub, after the spline collar fell off the spring end. I never would have guessed how those went back together!

Thanks,

Steve
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Old 06-25-2009, 08:03 AM
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snap ring really isn't necessary. issue might be that you're running the longer birfs. you could change to mini birfs. let me know if you need any...i've got a few.
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Old 06-25-2009, 08:19 AM
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it sounds like your outer axle (birfield) is one of the long ones. What year is your FJ40? It sounds like you need to switch to a minitruck/'79 and up FJ40 birfield.
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Old 06-25-2009, 08:40 AM
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For gosh sakes, if you do that go Longfields. Stock minitruck birfs are marginally stronger than D30 U-joints. Which is to say... not very.
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Old 06-25-2009, 08:51 AM
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Quote:
Originally Posted by nuclearlemon View Post
snap ring really isn't necessary. issue might be that you're running the longer birfs. you could change to mini birfs. let me know if you need any...i've got a few.
If you don't run a circlip you will beat the axle seal to death! The Circlip keeps the birf located, without it it travels in and out constantly.
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I need an FJ40....
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Cruisers are superior
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Old 06-25-2009, 10:04 AM
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To avoid the problem UB highlighted, you can use a bolt and washer on the end of the axle to keep it in place instead of a C clip.
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Old 06-25-2009, 10:05 AM
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To avoid the problem UB highlighted, you can use a bolt and washer on the end of the axle to keep it in place instead of a C clip.
Tru Dat! 8mm x 1.25 I believe....
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Old 06-25-2009, 10:13 AM
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but I'm still pretty sure his birfield is too long and that's the problem he's having.
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Old 06-25-2009, 12:29 PM
SteveH SteveH is offline
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Thanks for all your comments!

I'll take the cap of the hub off one more time and investigate. If I can get the clip on there, but it's not tight up against the hub, I presume you could install a washer or spacer to keep the axle from travelling in and out of the axle (laterally). That has to be the goal of the snap ring, right?

I'm puzzled as to why a bolt and washer would keep the axle in place in place of the snap ring? Wouldn't the head of the bolt ride against the hub dial? (If so, this wouldn't be a good thing). Is the washer bearing on any part of the hub?

The FJ40 axles are 6/78 production, bone stock. The truck had dealer-installed Warn M239 hubs that I removed to install these minitruck hubs, which are (I believe) from a '79-85 solid axle minitruck.
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Old 06-25-2009, 02:21 PM
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the bolt washer thing works in the opposite situation, if you have mini birfs and 77-78 hubs.

you need to go to the mini birfs to get it to fit correctly.
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