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Re: Alltrac - driveshaft failure at the u joint - running in FWD
cgregs and I have corresponded a little over this. I wanted to summarize here.
His van is running RWD (front shaft is removed)
I recommended locking the transfer as a method of protecting it while he figured out a solution to the broken front u joint.
There was a problem with this advice...
My 1991 transfer looks like this, with the shift shaft cap nut (upper right, 1st pic) and locking pin socket nut present...
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cgregs 1995 Previa looks like this...
The transfer seems to have been redesigned and the shift shaft external stuff is not there.
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The Toyota parts diagrams suggest that the entire shift shaft was designed out of the Previa transfer case starting in 1995. 1994 seems to be the last year with the shaft.
Can anyone else with a later model van corroborate this?
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
Thanks Jonny for all your help.
I am still trying to source this shaft for my van.
1. Is it possible my transfer case an be locked electronically?? Thought pulling a fuse or something. Maybe Jumping something in the diagnostics box.
2. I am trying to source a front propeller shaft for my 95 Altrac. No luck looking at local Pick-n-pulls. I am located in SLC, UT. If anyone has any leads, it would be greatly appreciated!
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
Ha, I'm in SLC too. Update your profile. You can buy mine for scrap yard price to get you on the road again with AWD for the rest of the Winter (not much of one yet, eh?). I doubt I'll ever turn mine back into AWD and if I do I have other vehicles to use while I find another shaft.
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
How did my old drive shaft work out for you?
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
For the record, there's a viscous coupling in the center diff... the driving attributes you described align with having it. Basically, the more one side spins, the more it tightens up, up to a point. Driving around without one axle connected WILL overheat it and lead to premature failure. (No I don't know how long it'll last) As it degrades, it may act more like an open diff or it may lock up.
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
Unfortunately cgregs32 has not completed his thread, so I'll do it for him. I happen to know that the replacement front shaft he bought from me and installed about a month ago was working fine right after install and had cured all the strange noises he was getting while driving without the front shaft. Personally, I think he can count himself fortunate that no lasting damage appears to have occurred from driving without a front shaft on one of the later model, non-manually-lockable, transfers.
Several people do seem to have got away with removing a shaft (front or rear) and continuing to drive for a while, so maybe these transfers are so rugged that it doesn't matter, or the viscous coupling fails in a manner that the vehicle still drives fine in make-shift 2WD without one of the shafts and without locking the transfer. Or maybe not. I sure would like to hear from anyone who has suffered serious repercussions from doing this, but although it seems inconceivable that it is not bad for the vehicle, so far I have not read about anyone confirming it in practice.
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Re: Alltrac - driveshaft failure at the u joint - running in FWD
I drove my 91 extensively without rear shaft. Park doesn't lock in so you can't forget to use the emergency brake! I found that out when it rolled into someone's mint restored classic car.
When I tried driving without the rear shaft on my 95 it went exactly one mile before the computer put a stop to it. I was afraid I had damaged it but once the shaft was back in it worked fine. I never knew about the transfer "lock" until long after these events
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