Jump to content


Photo

Driveshaft Confusion - Hybrid Gearbox


  • Please log in to reply
24 replies to this topic

#1 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 04 November 2017 - 06:10 PM

lurch!
need help! my car was on 71a box previously.
I bought a rb20det 71c box and got everything sorted out. while mounting it back on, the shifter stick doesn't come out directly in the middle of the console.
Is there any way to fix this? don't really want to spend on another s14 gearbox if possible. my mechanic told me the tail shaft might not fit too.

Edited by locklock, 04 November 2017 - 06:12 PM.


#2 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 04 November 2017 - 06:41 PM

lurch!
need help! my car was on 71a box previously.
I bought a rb20det 71c box and got everything sorted out. while mounting it back on, the shifter stick doesn't come out directly in the middle of the console.
Is there any way to fix this? don't really want to spend on another s14 gearbox if possible. my mechanic told me the tail shaft might not fit too.

 

Well... you've made a mistake...
S13/14 is the gearbox you require.
NOT the RB20/RB30 unit - They are 50mm shorter.
 

If you want to keep that RB20 box, you'll need to cut the front of your trans tunnel away,

cut the front of your centre console away to allow the shifter to engage 1st, 3rd & 5th, and get a new tailshaft made.


Edited by Lurch ™, 05 November 2017 - 09:03 AM.


#3 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 04 November 2017 - 06:42 PM

Note to everyone else: the above is what happens when you don't do the research and/or ask the right questions!



#4 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 04 November 2017 - 06:45 PM

don't really feel like cutting the console. so with the s14 gearbox, what about the tailshaft?

#5 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 05 November 2017 - 08:55 AM

If you had the 71A box fitted before you've converted it to the 71C box, you'll need to have a new tailshaft made regardless,

as the 71a box has an output flange (as opposed to a slip yoke on the 71B/C box's) and a sliding spline centre section.

 

Personally, unless you installing a 250hp+ motor, I would have kept the 71A flange drive box...



#6 dat2kman

dat2kman

    The 2000+ club

  • Members
  • PipPipPipPipPipPipPip
  • 4,057 posts
  • Location:Newport Waters Qld
  • Tagline:going sailing, see ya later!

Posted 05 November 2017 - 08:58 AM

don't really feel like cutting the console. so with the s14 gearbox, what about the tailshaft?

Stock tailshaft will fit the rb 20/30 box.
Stick needs severe bending,,, after to piss off the rubber insulated standard RB stick, and graft a B stick on, or use an "S " shaped stick from one of the early utes.
Or,
Go S13/14, you'll need a shorter, by 50mm, tailshaft ( no, nothing fits, you need to get your stock one shortened), but, the stick comes up through tunnel hole just nicely, and you can retain the C type condom filled insulated stick.

#7 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 11:31 AM

the original shaft is bolted to the end of 71a flange.
using the yoke with the the 71c, the both ends of the shaft is slotted in. do I need to weld either end?

Attached Thumbnails

  • IMG_20171101_1134085.jpg
  • IMG-20171101-WA0008.jpeg
  • IMG_20171101_1140544.jpg


#8 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 05 November 2017 - 11:43 AM

I don't understand what you are asking...?

You could cut the old diff yoke off the 71A tailshaft, and use the 71C output yoke

and join them together with a NEW TUBE.


Edited by Lurch ™, 05 November 2017 - 11:46 AM.


#9 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 12:05 PM

I don't understand what you are asking...?
You could cut the old diff yoke off the 71A tailshaft, and use the 71C output yoke
and join them together with a NEW TUBE.

yes I did that.
before the shaft was bolted on to the end of 71a. but now with the 71c is just a "tube" sticking into end 71c with no bolts.
picture for reference.
So both ends of my shaft is just sticking into the differential and 71c. nothing to bolt on.IMG-20171101-WA0008.jpeg IMG-20171101-WA0008.jpeg

Edited by locklock, 05 November 2017 - 12:06 PM.


#10 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 12:45 PM

is there something wrong with this tail shaft?
this is what I gotten when removed. the flange is to 71a and the spline to differential.

Attached Thumbnails

  • IMG_20171101_1134085.jpg

Edited by locklock, 05 November 2017 - 12:53 PM.


#11 1600dave

1600dave

    Senior Member

  • Members
  • PipPipPipPipPip
  • 598 posts
  • Location:Newcastle,NSW

Posted 05 November 2017 - 12:49 PM

No picture in your post above, I'm eagerly awaiting one as I'm with Lurch and don't understand ? The tailshaft will have a uni joint on one end, with a flange that bolts to the diff. The other end is an internally splined yoke also with a uni joint. It has to have a splined slip joint somewhere to take up any misalignment / movement / etc.

 

Like this, front yoke may or may not have a dust shield depending what its off.

Attached Thumbnails

  • tailshaft.JPG


#12 1600dave

1600dave

    Senior Member

  • Members
  • PipPipPipPipPip
  • 598 posts
  • Location:Newcastle,NSW

Posted 05 November 2017 - 12:55 PM

Yes, there is something wrong with the tailshaft you posted. Throw all that splined section away - all you need from your existing tailshaft is the flange and uni joint on the diff end . Then take the front yoke and uni joint from the S13 / RB20 / whatever box you have. Then join them together with a solid tube of the correct length, get it balanced up and away you go. It then bolts onto the diff and slips into the rear of the gearbox on a splined slip joint.


Edited by 1600dave, 05 November 2017 - 01:07 PM.


#13 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 01:00 PM

thanks! no wonder it was confusing.. now it makes sense!! thanks lurch, dat2kman and 1600dave!

#14 1600dave

1600dave

    Senior Member

  • Members
  • PipPipPipPipPip
  • 598 posts
  • Location:Newcastle,NSW

Posted 05 November 2017 - 01:16 PM

Just to be 100% clear, in the photo attached here, the bit circled in green comes from your existing tailshaft and bolts to the diff. The bit in red comes from the new gearbox. The tube joining them is new. 

Attached Thumbnails

  • tailshaft.JPG

  • locklock likes this

#15 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 02:07 PM

yes got it!
don't know what the previous owner did. the green circle was bolted to the 71a tail, and the red circle was just stucked into the differential.

#16 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 05 November 2017 - 04:44 PM

don't know what the previous owner did. the green circle was bolted to the 71a tail, and the red circle was just stucked into the differential.

 

AAEAAQAAAAAAAAw6AAAAJDhiNTM1ZDEzLTU5Yzct


  • locklock likes this

#17 Cozza

Cozza

    Senior Member

  • Members
  • PipPipPipPipPip
  • 941 posts
  • Location:Sydney
  • Tagline:Datsun obsessed

Posted 05 November 2017 - 07:07 PM

That’s intriguing, can you post a pic of how it was stuck into the differential?

#18 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 05 November 2017 - 07:25 PM

That’s intriguing, can you post a pic of how it was stuck into the differential?


sorry cozza, don't have pic taken. I believe it's 2 piece drive shaft.

#19 Lurch ™

Lurch ™

    Curator of the 'Gavin Collection'

  • Members
  • PipPipPipPipPipPipPip
  • 5,644 posts
  • Location:Victoria
  • Tagline:In my Den of Rust & Sin

Posted 05 November 2017 - 07:40 PM

sorry cozza, don't have pic taken. I believe it's 2 piece drive shaft.

 

OK, I understand whats going on... Communication breakdown.

These posts need to be split from the main topic as well - it's gotten off topic.


Edited by Lurch ™, 05 November 2017 - 07:41 PM.

  • locklock likes this

#20 locklock

locklock

    Advanced Member

  • Members
  • PipPipPip
  • 219 posts
  • Location:kuala lumpur/malaysia
  • Tagline:New Member

Posted 08 November 2017 - 05:52 PM

is this the original shaft?

I'm quite reluctant to shorten it, can I use a s13 shaft for this setup instead?

Attached Thumbnails

  • IMG_20171107_1418457.jpg
  • IMG_20171107_1418598.jpg
  • IMG_20171107_1638083.jpg





0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users