Prop conversion help please

as you might guess, I'm wanting rid of the rear doughnut in exchange for a uj.

I've got a prop, but what I want/need is a list of which vehicles/diffs I can take a flange from, and where does this spacer that's behind the flange come into it all and do I have to have it???

Thanks in advance

Towsey

flanges come in several types some 4 spline later mutli,you want one like this

frc3002,depending on length of spigot you might need a spacer too

539745

What's wrong with the donut?

We've done 80k miles on one donut with no problems, that's on a D2 V8 that tows a lot.

Most fail through incorrect fitting.

Peter

Cheers folks

The prop I've got came off a v8 the other day from a scrap yard but the diff was gone so no flange. There was about 3 td5s I could of got a front flange from but I didn't know if they were the same or not so I didn't bother. Ive got a mate who has a spare diff I might be able to get off him tho, and if not, il see about getting a flange and spacer from somewhere. I've seen a new donut ruined in one day at kirton. It was fitted on the Saturday ready to go to kirton on the Sunday, and when we left on the Sunday and got going on the road it destroyed itself within a mile. Luckily there was a spare that we fitted and off we went. How do you fit a donut incorrectly tho???

Cheers

Towsey

The donut has three heavily moulded/reinforced sections, the drive to the rear axle MUST go through these sections so they are compresssed on drive and in tension on the overrun.

It is possible to fit the donut so the unreinforced parts take the stress and they fail.

It is in RAVE, Page 847 Section 47.20.08.

Peter

listerdiesel said:

(1) What's wrong with the donut?

(2) We've done 80k miles on one donut with no problems, that's on a D2 V8 that tows a lot.

(3) Most fail through incorrect fitting.

Peter

Click to expand...

1) IMHO the original design included the doughnut for NVH issues, and unless you have a lift which takes it outside of its design parameters, it is best left in place. If you take it oout make sure you tell your insurance company about the modification, and make your your service schedcule accommodates the increased stress on the rest of the mounts.

2) Agreed. 115K on mine including towing a twin axle caravan, no problem, 100K on a previous D1 without issue which towed a cattle trailer a LOT, with a live load in. etc..... etc...

3) This is my experience, and my opinion too, re-inforced by 23 years of discovery ownership.

IMHO, incorrect fitting also includes unequal torque on the bolts which will stress the coupling for no reason other than laziness.

I replaced the one on my auto last year due to its age, and it looking, ahem, "rather perished". I replaced the one on swmbo's manual yesterday for the same reason - both with genuine GKN.

Cheers for the info

As I put in my post I've seen a new donut not survive one days off roading at kirton, and this is to be an off reader used in places like kirton and tong. If it was to be used for normal type duties then it would be staying on, but it's getting a 2" lift and will be articulating well (I hope) which is known for pushing them beyond their limits

Towsey

I've got a 2" lift and not experienced any problems - yet ...

Our son's D2 V8 has a Terrafirma 2" lift and his coupling has lasted 2 years, including some off-roading and towing.

If it was that fragile it wouldn't have been used.

Peter

You can replace as many rubber couplings as you want but if the pin and bush are worn it will destroy them PDQ.

wammers said:

You can replace as many rubber couplings as you want but if the pin and bush are worn it will destroy them PDQ.

Click to expand...

Nailed it. Absolutely, completely and utterly nailed it. Thankyou @wammers ....

You know, I never even thought that folk would do "just" the actual coupling - and when I said in post #7 above that I had replaced the "coupling" - what I actually meant was I had done the coupling and bush together, as a single unit - which is how I see them, and, IMHO, how they MUST be considered - I.E. as a single unit - Checking the pin as part of the job. Are folk re-using the old bolts too?!?!?!??? Do they replace half a wheel bearing ?!?!?!?? put a new bearing on a damaged stub axle ?!?!??!?