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asuly

1977 280z unserviceable U-Joints

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Hi, I know that their are some threads on questions like this, but none of them seem to give a straight answer. Im 15 and starting to get very intrested in Z's.

Ive been trying to get my engine+transmission ready for removal and ive got everything disconected except for the trans mount and the driveshaft. My question is how do I remove the drive shaft from the transmission? I didnt see any u joint clips so after some research i found the the u joints are unserviceable. How am I supposed to disconnect them? Ive been trying to unscrew the 4 bolts by the differential but they are very inaccesable. are there any other ways?

Thanks for any help!

Alex

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You have to disconnect the driveline from the rear diff. The bolts are a PITA! but it needs to be done. The driveline then slips right out of the tranny. Be prepaired to loosed oil there. If you plan to pull the tranny and engine together, save yourself some grief and drain the oil out of the tranny first.

Good luck! It isn't all that difficult if you are already confident in pulling the motor and trans.

Leonard

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Ok thanks alot! Ill try to get in there with a normal wrench. Right now I have the back wheels on ramps and the front is on jack stands. Do you have any idea where I can place the jackstands on the rear side? That way I can get under their a little better. Would it be wise to remove some of the rear suspension components to acess the bolt easier? Thanks!

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Ratcheting wrenches will save you a lot of time. Jacking and support points are described in the FSM, look in the "General Information" section.

Edited by LeonV
Clarification

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By putting the car on the stands, you can rotate the driveline instead of the wrench to get the bolts out. It will become clear when you get there.

Do be safe!

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Ok I put the back on jack stands but I am not completely sure i put it in the right place. I looked at the FSM but the pics are a little hard to see. I took a couple pics and attached them.

Also what do you mean by rotating the driveline? Ive heard this before but I never understood how? :stupid:

Thanks for the help everyone

PS. sorry for the crappy pics.

post-23743-14150813921865_thumb.jpg

post-23743-14150813922188_thumb.jpg

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After you initially get the bolt lose, hold the wrench stationary and rotate the driveline 1/8th turn or whatever it might be and then reposition the wrench. It is easier than trying to the wrench in that tight area. It is a preference thing I suppose. I think you'll catch on.

I can't tell from your pics. When I use stands, I put them under the seat belt indentations on the floor. The key is a good solid location that is out of the way, won't do damage to the car, and SAFE.

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Technically there is no need to remove the driveshaft at all if you remove the engine and trans as a unit. Drain the trans first and just take the engine/trans out. Drive shaft just slips out. Done it several times including putting it back by lining it up on the way back in. Call me lazy.

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Removing the driveshaft is easy. I have a set of cheap, thin offset wrenches that I've used to do that job many, many times over the years. He's pulling his engine so what you describe would work for him this time but for times when he's not, it still would be helpful to know how the remove the driveshaft.

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Sticking a screwdriver through the u-joint yoke is an easy way to rotate the driveshaft, to break the nuts loose.

Get the wrench on the nut, then get the other end of the wrench pegged against a body part (the car's not yours) stick the screwdriver though the yoke and break the nuts loose by turning the driveshaft with the screw driver.

Pretty sure I read the method here or on another forum and I've used it several times. It's easier and more convenient than trying to lock the brakes or put the car in gear.

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Ok thanks everyone for the help I think i will just try my luck again tommorow or next weekend by rotating the driveshaft (might just slide it out like Zkars said). Im going to document my 'restoration' (half restoration) and ill let everyone know how it goes. Dont have much time right now with school and all. thanks for all the help!

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Zed Head's method works like a champ. I'm sure asuly already has this done but I'll pop in my 2 cents. Torque spec on those driveline fasteners is very low, in my opinion so they come off pretty easy first time. I soaked for a day with PB Blaster. Screwdriver in between the Rear U-Joint, trans in neutral and box end wrench on it the fastener (10MM?). Don't forget to mark the driveline mount with the companion flange so the weights line back up in the right spot or you may have to pull it apart and rotate it 180 degrees if it's out of balance. Also, it says in the FSM that the Exhaust needs to be unbolted and swing away... I was able to get mine out by sliding it all the way to the bottom of the slip yoke, angle it towards the rear passenger and over the sway bar. It's a tight fit but after snapping off a exhaust bolt I figured it's easier this way.

Then to echo what sblake01 said, SAFE!! Last thing you want is being under one of these rust buckets torquing on a nut and it drops. asuly, keep us updated. I wish I was your age when I had my first opportunity to pull a motor. Count your blessings, some of us never have pulled a motor, myself included.

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