Peppy's Build Thread

[Ralph Wiggum]

I disagree....

["Captain Retard"]

^^^so you disagree and.........

I can't be bothered waiting any longer so I'm going to bed.

[Ralph Wiggum]

Most if not all modern live axle vehicle s run a multi piece tails shaft (inc ford utes) some larger commercial will even run multiple hanger bearings.

*respectfully disagree.

Oh and good night

["Captain Retard"]

That's cool!

I'm for the most part still stuck in the 70s when it comes to cars.

I've seen the multi shafts on trucks but never realised about the later model live axle stuff.

Will have to check it out!

Ni-night

[eff xr6t]

To add to the tailshaft topic I have a 3.5imch chro moly shaft with 1350 series unis in my El falcon which is obviously live axle but I definetly noticed vibration increase with the bigger diameter shaft not huge but it's definetly there. I would go a 2 piece in one of these for the fact of being able to go smaller diameter for the same hp rating and giving more room for the exhaust.

[Wilko16]

That is a big heavy shaft...

High speeds could be very dangerous

Single piece is why old Falcons were speed limited to 180

[Ralph Wiggum]

Lol...big heavy shaft.

[eff xr6t]

Haha Yeh it's big and heavy I'll weigh it next time it's out but I'd say it's the same weight as a stock shaft. I'll test out the speed theory next year at racewars 1km foot to the floor should see if it'll break.

[10SECN]

  On 08/06/2015 at 1:14 AM, Skids4kids said:

Porsche CV FTW.

You then have the forgiveness that a CV offers alignment wise.

u gotta link mate ?????? ... I don't wanna use a uni !!!!

[Peppy_t92]

Alright I spoke to two of the bigger driveshaft shops that I know of.. Hardie Spicer and Gibson Shafts...

So to break it down, the std shafts are designed purely with standard power levels, ride height, comfort, serviceability, and cost in mind just as the rest of the car is

A two piece shaft is a must, due to a few reasons, most have been mentioned above.. The length and space/clearance...

A longer tube needs to be bigger and thicker to have the same torsional strength as a shorter thinner tube, in our case, it would need to be a massive shaft

It gives us proper ground, exhaust, and handbrake cable clearance.. Then the CV is necessary at the back to allow for the high pinion angle and all the movement in the diff, I.e acceleration and deceleration

This is just my interpretation of the info I was given

Now Hardie Spicer said there's only one way to do it to make it last and that's my way! Change the yoke on the gearbox and diff, to suit some big uni joints, and install a big centre bearing.. It will be noisy, it will vibrate and it will cost upwards of $2k... I suggested the cv Idea and mentioned that I wanted to retain the rubber coupling at the back of the box, he said I can't help you then lol

Next was Gibson, his 1000hp shaft couples directly to the back of the box, then a bigger centre bearing, Dana Spicer 4340 uni joint, a slip joint and another Dana Spicer Uni with a flange that suits the std flange on the diff...

I said I was worried about the noise and vibration that people had felt with his shafts before, he told me that every falcon he has seen needed different packing to get the right angle which helps reduce vibration and noise dramatically and that he has just bought a new state of the art electronic balancing machine so the NVH should be non existent to minimal... I mentioned the Porsche CV idea and he took it on board, said it can be done but doesn't think it's necessary, also that the ford cv should be strong enough, and most snapped cv's he had seen were due to excessive diff movement from stuffed or soft bushes, which makes sense... He's still going to look into the Porsche CV and get back to me tomorrow but suggests it's going to be expensive, straight from Germany...

He was great to talk to and answered everything I had for him, we were speaking for a good 30-40mins

I also got in contact with someone that installed the Gibson shaft just last week and he said there is zero noise or vibration, so if that's the case, I'm happy to stick with the Uni's.. Easier to replace then a cv I guess

Thanks Joe