Having only a 2wd Granvia, I'm not familiar with what would be the effect on the transfer-gearbox of disconnecting the drive to the front axle (or removing the remaining front half-shaft). There must be plenty of advice available on converting a 4wd Toyota to 2wd....
If it is just the U/J that is broken it is not too difficult to fit another but you will need to watch a video on utube to see how it is done if you have never done one before, but you will need a vice, hammer, sockets, grease and internal circlip pliers to carry out the job, and the U/J of course.
Try this link to help look up your parts, just put in your chassis number where it asks for frame number.
The front axle is always driven and the rear axle is driven via a viscous coupler, which has to 'warm up' before acting.
This makes the two 4x4 Granvias that I have basically mostly front wheel drive, this may be due to age of the vehicle though, both mine are over 100k miles.
I took the front prop shaft off to see if it would drive and I had to floor the van in drive before the viscous coupler would engage, I managed to 'lock' it up for a couple of days before it released and you sit somewhere revving until it locks again with the required heat.
I have converted both my vans to rear wheel drive due to front 'axle' spline wear noise, by welding the viscous couplings and removing all the components forward of the transfer box.
Apparently the transfer case chain skips a tooth now and then and would also like to make it into a rear wheel drive only.
Does the transfer case have to be removed inorder to weld solid the viscous coupling or can the coupling be removed
from the case?
Would appreciate more info.
Take off the rear prop shaft and centre bearing and it can hang down from the axle or tie to exhaust.
Take off the front prop shaft completely.
Remove the speedo drive, carefully, it's fragile.
Drain the transfer case oil, remove both rear plugs.
remove the transfer rear cover bolts, there's a couple of places for a pry bar to remove the cover.
The contents of the case pulls out rearward together.
I welded a plate over the opening of the front (knocks off) dust cover so I didn't have to replace the front drive shaft.
The viscous coupler body is grooved like a toothed belt pully, I found the moving joint and aligned the ridges and welded in all the wells.
I aligned it in the case because I looked at the diff gears and thought they might not mesh if I moved it around while disengaged.
Cover the rear bearing before welding to prevent fouling.
Both my viscous couplers were different one bigger than the other. Cases were the same though.
Then 'I' just replaced the viscous coupler, leaving out the front shaft and chain.
Cover needs some gasket sealant.
The oil looks and feels like ATF, that's what I put in.
The front axle comes off with some jiggling and swearing. No need to disturb the front hubs, other than the shaft retainers.
This is from memory, as I last did it 9 months ago.
I also didn't seal the transfer case properly the on the first van, so the oil leaked out and the bearing went noisy (I knew it was leaking, I'm lazy) so I fitted a RWD gearbox.
This works by using 1 part of each propshaft 4x4 and RWD to make up the difference. But the speedo will be out, but that is fixable with an Arduino.
Fitting the RWD gearbox, everything fits with a bit of jiggling. Torque converter bolts are fiddly though.
But your comment on the chain, may change my plan and renew the other half-shaft too, but was told it looked okay??
In the seventies we used Ford, GMC, Dodges in the exploration field and a number of chains had to be replaced,
BUT I cant imagine the Granvias were used in same HD operations.
As mentioned before, the Toyota ¨ 4-runner¨ halfshafts fit the Granvia as well.
Will make it a RWD if all else fails.
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