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CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 2:59 pm
by frase29
Hi guys,

Finally found an LSD in great condition for a good price near me, so have jumped on it and it's sitting in my garage awaiting fitment! I've read the guide on getting it fitted, and converting the shafts to bolt on CV's, though I'm just unsure on which clips etc i will need. I don't have a set of bolt-on shafts with the diff, so I can't just take both apart and rebuild with whichever gives the right fit, so wondering which i actually need! Would a pair of new CV joints with the clips they generally come with give me all the bits i need, or should i look to get a pair of shafts to make sure?

Thanks in advance

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 3:53 pm
by Corky
I bought the flange fit cv kits for Sierra 7" diff on eBay. They contained everything I needed to convert my driveshafts. The shafts are handed, so don't mix them up.

I can't remember if I needed any bits from the original joints (maybe a circlip?), but I kept everything until I'd done the job to be sure.

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 4:11 pm
by scimjim
Yep, just the circlip and the spring if you want to fit it. I've done two and fitted them on one but not the other and both are fine.

CV flange

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 5:33 pm
by frase29
Excellent! So I'd just need to buy two of those, and fit using whichever combination of clips from the old joints and clips that came with the new CV's?

Very surprised (and pleased) at how cheap those are! Are they good quality? I'd happily pay a bit more if there's a better variant to be had, though equally very happy to save some money :lol:

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 5:38 pm
by scimjim
Mine have been on snotty (road going Ti that's done a couple of track days) for a few years. At that price I have a spare set on the shelf :-)

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 5:50 pm
by Littlescim
Merlin motorsport do a race quality joint.Don't forget to fit the springs when you assemble like I did because without the preload you wil wreck the joint

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 5:53 pm
by scimjim
Just edited my post - one car has the springs, one doesn't - they're not actually needed with the bolted flange.

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 5:58 pm
by Corky
Pretty sure that those are the same ones I have on the Sabre. It's done three or four seasons of motorsport with up to 200bhp, so I'd say they are perfectly fine. I've fitted a set to the SS1 Ti that I'm hoping to wring similar HP from.

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 6:22 pm
by Littlescim
I smashed a joint off the startline at Loton on stickey tyres without the springs,Craig said it was because the springs were missing so I bowed to his superior knowledge

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 6:36 pm
by scimjim
Ah, okay. Pretty sure it was his instructions that said they weren't needed? Ford don't fit them on the bolted shaft version AFAIK?

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 7:11 pm
by Littlescim
If the spring is missing there is nothing to stop the shaft going in towards the diff and puts the cage under load a its weakest point

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 7:12 pm
by reliant-reviver
ED. beaten to it.
jim that may be true wiith bolted joints either end. Think what the outboard sprung trilobes are now trying to do on a hybrid shaft

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 8:18 pm
by scimjim
I don't see how or why it it puts the cage under load? Where is the weakest point?

The CV inner cage sits on the splines - doesn't matter where on those splines it sits as it can't reach either end of the splines.

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 9:21 pm
by reliant-reviver
Littlescim doesn't say whether it was in inboard Lobro or an outboard Trilobe that failed.

The trilobes are weakest when the bearings are running near the end of the open slots / journals. Hence why the trialers seem to keep breaking them with ther jacked up suspension and over-extended shafts.

Two trilobes will centralise the shaft between them. One trilobe one unsprung lobro and you have a shaft that is being pushed off centre.

Re: CV Joints and Clips for Viscous LSD Conversion

Posted: Mon Jul 17, 2017 9:43 pm
by CNHSS1
I think hot hatch hunter says to fit the springs from the trilobe to the on-board CVs but many seem not to bother and get away with it, but my cars have always had them. Without it preload the CV cage as littlescims says and runs the trilobe at the end of the yoke which causes that end issues.