Land cruiser tail shaft balance

Submitted: Monday, Jul 15, 2013 at 09:03
ThreadID: 103248 Views:3522 Replies:5 FollowUps:3
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Hi all.

I removed the tail shaft on my 75 series troopy on the weekend. Stupidly I forgot to mark it all out first.

I unbolted it at the rear diff and pulled it out of the slip joint. I have noticed there is a weight on the tailshaft and a larger weight on the yoke attached to the transfer case.

I think there are maybe 20 splines on the tailshaft so I have a 1 in 20 chance of getting it right when I put it together.

Anyone have any ideas of how to get this right apart from trial and error? Have driven cars with out of balance tailshaft and its not exactly ideal for long trips.

Thanks
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Reply By: brianc - Monday, Jul 15, 2013 at 10:09

Monday, Jul 15, 2013 at 10:09
The critical bit is to line up the yokes. It may only go one way, although with an even number of splines it may have two possible positions. Pretty sure there isn't a master spline on these things. So the yokes on each end of the tailshaft are aligned.
AnswerID: 514818

Reply By: Lyn W3 - Monday, Jul 15, 2013 at 10:33

Monday, Jul 15, 2013 at 10:33
Tailshafts are generally balanced off the car so it shouldn't matter which way it goes on, same as a balanced wheel.
AnswerID: 514819

Follow Up By: 08crd - Tuesday, Jul 16, 2013 at 11:07

Tuesday, Jul 16, 2013 at 11:07
Your right, they are dynamicaly balanced when manufactured. They don't balance the tailshaft to the car.
Therefore position doesn't matter.
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FollowupID: 794017

Reply By: pop2jocem - Monday, Jul 15, 2013 at 10:33

Monday, Jul 15, 2013 at 10:33
As brianc said there only two possible ways to re=assemble without causing your uni joints some grief. Line up the crosses and take it for a spin. If you get vibrations try 180 degree alignment shift.

Cheer
Pop
AnswerID: 514820

Follow Up By: Ross M - Monday, Jul 15, 2013 at 11:21

Monday, Jul 15, 2013 at 11:21
I second that. only two options possible, with yokes in the same plane.
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FollowupID: 793959

Reply By: Hoyks - Monday, Jul 15, 2013 at 11:35

Monday, Jul 15, 2013 at 11:35
Shafts I have disassembled in the past (none from a Toyota) have had alignment marks stamped in the end of the splined shaft. If you line the punched marks up all should be good in the world.
AnswerID: 514825

Reply By: rb30e - Monday, Jul 15, 2013 at 18:45

Monday, Jul 15, 2013 at 18:45
Thanks all, that makes perfect sense, feel like a dummy now for not thinking of that already.

Will get under and have a look when the weather clears up and the pond under my car has dried up.
AnswerID: 514843

Follow Up By: Crammo - Tuesday, Jul 16, 2013 at 15:57

Tuesday, Jul 16, 2013 at 15:57
On my Cruiser with the yokes correctly aligned all 3 grease nipples on the shaft are also aligned. Seems to make sense that Toyota made them that way.

Brian
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