Jump to content


Photo

UC two piece shaft


  • Please log in to reply
11 replies to this topic

#1 UCSLE

UCSLE

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 702 posts
  • Name:troy
  • Location:perth
  • Car:Goggomobil
  • Joined: 23-June 09

Posted 04 February 2020 - 09:46 AM

been looking at doing a engine conversion in a UC and some of the engine / gearbox combos have flex joint type tail shaft not a slip yoke

 

my Question is can the stock type two piece shaft be used with a flex joint shaft ? is there enough slip in the CV ?

obviously the shaft will need cut down and modified to suit .

 

most cars i have seen with the flex joint are IFS not a solid axle

 

the car at the moment has a one piece shaft after a 4cyl to 6cyl conversion and the original shaft is long gone so i have nothing to compare to .

 

 



#2 yel327

yel327

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 13,008 posts
  • Joined: 10-February 08

Posted 04 February 2020 - 10:30 AM

In a UC Starfire the gearbox sits further forward as the front of the Starfire is the same as a red 6 but the back of the engine is cut off. Not sure why they fitted a centre join as a single piece shaft would still be a lot shorter than say a HQ Statesman with a 6cyl, banjo and manual box.

All I did with the Starfire, MC6 UC Sunbird I had is bought a rusty UC Torana and used everything from fan to diff except kept the MC6 in the Sunbird, which had to move backwards. The 6cyl tailshaft went straight in. Should be the same tailshaft as any 6cyl LH-UC. The only major mod was I had to cut the shifter hole further back in the tunnel and made up a piece of flat steel to cover the front of the original 4cyl hole and riveted it in place.
If it is an auto I think the box still moves forward but the shifter stays. In LH with Opel and Aussie 4spd they bolted the shifter into a little cradle that bolts to the floor using the T-bar hold down bolts, moved the box forward and used longer shift rods. Not sure how they did Opel in UC, I assume it is like Starfire.

#3 76lxhatch

76lxhatch

    That was easy!

  • Members
  • PipPipPipPipPipPipPip
  • 7,142 posts
  • Location:Unzud
  • Car:SS
  • Joined: 04-August 08
Garage View Garage

Posted 04 February 2020 - 01:19 PM

The two piece setup helps to achieve uni joint angles that aren't possible with a one piece driveshaft, I'm not sure if that's the reason Holden used them but its why I have one.

 

Mine is a Commodore unit with centre CV joint, it has ample slip movement to allow for live axle suspension travel. In this case it would be fine to use a coupler on the front rather than a slip yoke as all the movement is provided for rear of the centre bearing and the front section doesn't move at all.

 

The UC I have here uses a third cardan (standard uni) joint in the centre, not a CV. Its pretty buried so I can't get close enough to see how the slip action works, but I'd assume its catered for behind the centre bearing?

 

Not so sure I'd be willing to use a coupler at the diff end where it could potentially be under more stress and changing angles.



#4 ozyozyozy

ozyozyozy

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 944 posts
  • Location:perth
  • Joined: 13-February 08

Posted 04 February 2020 - 07:33 PM

Flex joint? Are you refering to to a rubber donut thing between the trans and tailshaft?
If it is, heads up for you, if the shaft and trans are not near perfectly aligned it will chew those rubbers up in no time, they can be a pain in the arse to get right.
If you can convert to a uni or a cv joint you will be far better off.
2 pieces shafts are not just about uni angles, they sometimes use them due to distance between trans and diff, a centre bearing gives extra support for the weight of the shaft.
Drive shaft builders have formulas to work out at what point they need to look at going 2 piece.

#5 Bigfella237

Bigfella237

    Socially Distant

  • Members
  • PipPipPipPipPipPipPip
  • 4,362 posts
  • Name:Andrew
  • Location:Far South Coast of NSW
  • Car:(s) not as many as I'd like but more than I've got space for!
  • Joined: 31-October 14

Posted 04 February 2020 - 08:18 PM

TR6060-Tri-Flange-from-Sonnax-distribute



#6 rodomo

rodomo

    To advertise here, call 13TORANA

  • Members
  • PipPipPipPipPipPipPip
  • 17,997 posts
  • Name:R - O - B Dammit!
  • Location:Way out west of Melbourne Awstraylya
  • Joined: 10-December 05

Posted 04 February 2020 - 09:02 PM

Drive shaft builders have formulas to work out at what point they need to look at going 2 piece.

The mob that did mine said 5000rpm then they get difficult. If my memory is correct, Sunbird tachos go to 5500?

#7 ozyozyozy

ozyozyozy

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 944 posts
  • Location:perth
  • Joined: 13-February 08

Posted 04 February 2020 - 10:45 PM

The mob that did mine said 5000rpm then they get difficult. If my memory is correct, Sunbird tachos go to 5500?


Easy way to know your tail shaft rpm, most autos are 1-1 gear ratio top gear, 4th on most manuals are 1-1, so max engine rpm would equal your tailshaft speed, if you have an overdrive it would be higher.

#8 76lxhatch

76lxhatch

    That was easy!

  • Members
  • PipPipPipPipPipPipPip
  • 7,142 posts
  • Location:Unzud
  • Car:SS
  • Joined: 04-August 08
Garage View Garage

Posted 05 February 2020 - 04:52 AM

Actually now that ozyozyozy mentioned it I have seen a number of driveshafts made with a CV at the front to replace the coupler, this gives you the bolt-on functionality and provides the slip yoke fore/aft movement in one. Would be worth looking into.



#9 claysummers

claysummers

    Lotsa Posts!

  • Members
  • PipPipPipPipPipPip
  • 3,273 posts
  • Name:Clay
  • Location:Willunga
  • Car:186 FB Ute, 3.3 EK sedan
  • Joined: 13-December 18

Posted 05 February 2020 - 07:17 AM

Not to mention helping to resolve the output shaft to tailshaft angle issue.

Sent from my SM-A705YN using Tapatalk

#10 yel327

yel327

    Oh My, Don't you post alot

  • Members
  • PipPipPipPipPipPipPip
  • 13,008 posts
  • Joined: 10-February 08

Posted 05 February 2020 - 08:15 AM

Actually now that ozyozyozy mentioned it I have seen a number of driveshafts made with a CV at the front to replace the coupler, this gives you the bolt-on functionality and provides the slip yoke fore/aft movement in one. Would be worth looking into.


I think my MQ Patrol ute front shaft was sort of like that, had a double uni on it. Helped when I put a SBC and TH400 in it as the engine and box angle was slightly steeper than the original 4.0L engine and 4spd manual

#11 76lxhatch

76lxhatch

    That was easy!

  • Members
  • PipPipPipPipPipPipPip
  • 7,142 posts
  • Location:Unzud
  • Car:SS
  • Joined: 04-August 08
Garage View Garage

Posted 05 February 2020 - 08:20 AM

A double cardan basically acts like a CV because its self-cancelling, but an actual CV would be better in this application as it would provide some longitudinal movement too. I'm guessing UCSLE has something like a late model TR6060 that has a fixed output flange rather than using a traditional slip yoke.



#12 UCSLE

UCSLE

    Forum Fixture

  • Members
  • PipPipPipPipPip
  • 702 posts
  • Name:troy
  • Location:perth
  • Car:Goggomobil
  • Joined: 23-June 09

Posted 06 February 2020 - 12:27 AM

thanks for the reply's .

working out the angle has got me a bit worried , think i,m going to spend more time and look at getting something with a slip yoke

or get it converted






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users