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How can I determine (without taking it all apart) whether I have the semi-floating or the full-floating rear end?

I'm told that the Toyota 1-ton truck came from the factory with the SF rear end but either (a) the FF rear end was a factory option or (b) lots of people converted theirs from SF to FF.

RE: semi-floating vs. full-floating axle

Some earlier Toyhomes (early-to-mid 1980s) came with the semi-floating axles which were not appropriate for the heavy
load of the coach and tended to fail in service.

Your 1991 model has the full-floating axle.

Page SA-127 of the .pdf file linked by Tika has an excellent diagram of the (full-floating) axle and wheel bearings. They are the repackable
tapered-roller-cage style and are sealed from the axle tubes.

Page SA-123 shows the rear axle for the single-wheel (semi-floating) models. It uses a sealed roller bearing but that bearing sits
in the axle tube and IS exposed to gear oil from the differential.

The above differences probably explain why different mechanics have given you different answers.

Buzz L.
Phoenix, AZ

Thanks, Buzz.? I asked the same question of the local Toyota Truck dealer and service shop and they said they "believe this is a semi floating rear end however if you have a large hub protruding from the center of the rear wheels there is a possibility this is a full floating.".? I do have such a large hub so according to them "there is a possibility" it's full floating.

You'd think they would know, instead of this "possibility" nonsense.

Sure would be nice if I could get an authoritative and known-correct answer from folks who do this stuff for a living, every day.

This is the same outfit that wants north of $1600 to do the front and rear wheel bearing repacks.

i've repacked hundreds of full float axle bearings.? most are lubed by gear oil. toyota is the one off that seals the gear oil from the bearings. anyone who has worked on full floaters will tell you in an instant if its a floater or not.? since these people didn't know, i wouldn't let them work on it.
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rz

For older vehicles like ToyHomes, the dealership is often not the best place to get servicing.

Auto dealership repair departments mostly work on newer vehicles. Given the high turnover in the trade,
it's unusual for dealerships to have technicians familiar with models older than 10 years.

An independent Toyota specialist shop that's been in business for a long time is the most likely
place to find technicians with good experience on older Toyota trucks.

Buzz L.
Phoenix, AZ

Thanks, Buzz.? Yeah, that's kinda what I figured.? Also the idependent shops tend to have more reasonable rates, I'm finding out.

I've called several independent shops with no luck.? There is one shop that specializes in Lexus and Toyota, but they can't fit it into their shop.? Another one, which is where we're taking it for the wheel bearing repack, doesn't want to do it because of liability issues on an engine that old.? My regular mechanic can't do it until at least October and doesn't want to do it anyway because it's outside of their main area of expertise (they're a transmission shop that also does general auto maintenance but doesn't get into major engine work).? Another shop over in the next town can do it next week but they don't impress me as someone that knows what they are doing, also EVERYbody else is booking several weeks to a few months ahead so why is this shop's calendar so open?

I called a different Toyota dealer (different from the one I had called before, the one that replaced my starter).? They want $1400+parts to do it at a shop rate of $180/hr vs the first dealer who wants $990+parts at a shop rate of $165/hr.? For comparison, the shop that will do my wheel bearing repack gets $111/hr.

i would look for a shop specializing in trucks
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rz

The Nissan motorhomes full float dually's are also of the sealed packable bearing style as well.

normal for full float
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rz