fj80 front diff prob

Submitted: Monday, Jul 11, 2005 at 11:48
ThreadID: 24612 Views:1736 Replies:4 FollowUps:7
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Hi , has anyone had problems with the 80 series front diffs on the gxl petrol models, and does anyone have a manual on rebuilding them
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Reply By: locallaw - Monday, Jul 11, 2005 at 16:38

Monday, Jul 11, 2005 at 16:38
Gidday,What problems are you having with it.A bit more info would help.
Seeya Locallaw
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Follow Up By: fj80guy@home - Monday, Jul 11, 2005 at 19:25

Monday, Jul 11, 2005 at 19:25
hey , it has dropped the pinion into the crown wheel by the looks of things and taken 3 teeth of the crown , havent pulled the centre completely out yest , you can turn it one way , then turn it back the other way and it locks
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Reply By: Member - Geoff M (Newcastle) - Monday, Jul 11, 2005 at 16:55

Monday, Jul 11, 2005 at 16:55
Toyota has an excellent manual on the 80 series.
What specifically are you having troubles with that requires a rebuild?

Geoff.
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Follow Up By: fj80guy@home - Monday, Jul 11, 2005 at 19:28

Monday, Jul 11, 2005 at 19:28
hi Geoff , iwas after a manual so i know what the backlash on the gears need to be , i was going to pull it out and rebuild it myself , i have a haynes manual but it shows you didly squat
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Follow Up By: Member - DOZER- Monday, Jul 11, 2005 at 19:50

Monday, Jul 11, 2005 at 19:50
8 to 12 thow backlash.Email me on limo4b@yahoo.com.au and i will scan the Yota book pages for you.
Andrew
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Reply By: Member - DOZER- Monday, Jul 11, 2005 at 17:29

Monday, Jul 11, 2005 at 17:29
It is common for the c/v joints to wear out on the constants, which click under hard turning, more noise than actual problems, but they then start to leak diff oil and rego doesnt like that.
The diff centre doesnt like high torque in reverse, and the gears sometimes smash...dont snatch with an 80 or 100 in reverse.
Andrew
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Follow Up By: fj80guy@home - Monday, Jul 11, 2005 at 19:31

Monday, Jul 11, 2005 at 19:31
hi dozer , there is no clicking noise in the cv's , well there wasnt before this , noticed a vibration , but put this down to a wheel bearing that i fixed the week earlier on the rear , thw wife simply reversed it out the drive , went to take off and bang , no drive unless ya lock centre dif lock
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Follow Up By: Member - DOZER- Monday, Jul 11, 2005 at 19:46

Monday, Jul 11, 2005 at 19:46
Ok,
I think the most probable reason for this is the drive plates...they wear the splines and then they start spinning in them.
Take the dust caps off the axles each drive plate, and unlock the ctr diff.
You will soon see if one is stripped out.
if ok, drain the diff oil and see if chunkies come out.
Andrew
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Follow Up By: Member - DOZER- Monday, Jul 11, 2005 at 19:52

Monday, Jul 11, 2005 at 19:52
ps drive plates are where a free wheeling hub usually goes.
Andrew
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Follow Up By: fj80guy@home - Monday, Jul 11, 2005 at 20:51

Monday, Jul 11, 2005 at 20:51
ok , ive unbolted diff centre and removed front tail shaft so i can get a bit of a look at the centre , chunks in the oil, this is how i saw the crown wheel missing the teeth , i put it down to wearin the pinion shaft maybe letting it move, but when i pull the axles out i guess i will know , either rebuild it or look for a good second hand one as the reco ones are pricey , had to replace rear centre on myother fourby ,( bunderra) , cost me a squillion
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Reply By: Member - DOZER- Monday, Jul 11, 2005 at 21:02

Monday, Jul 11, 2005 at 21:02
I have a complete centre in good condition if you want to swap and go.
You will notice the teeth are missing next to the large "window" in the hemisphere....which allows reduced support of the crownwheel in that area.
You will also notice you need o drop one side of the steering arm to get ctr out of diff housing.
Andrew
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