19 replies to this topic

[claysummers]

I’ve done this with a lsd centre from a 3:36 in to a 3.08. The banjo cases, gear sets and carriers are all interchangeable across the Torana range and from some time in the FJ run through HZ. Correct me if I’m wrong gurus.


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[S pack]

Thank you for the diff parts page Clay.

 

The case is different between 3.55/3.36 and 3.08/2.78 ratios. The offset of the crown wheel mounting flange is engineered to suit the differing thicknesses/sizes of the 3.55/3.36 and 3.08/2.78 crown wheels and pinions.

I can't remember which way it is, however in one instance you would have to install a shim between the crown wheel and the flange and in the other instance you would need to machine some off the flange.

The Carriers are also designed to accept certain ratio sets. The Carrier for the 3.08/2.78 ratios has the two long bolts the Carrier for the 3.55/3.36 ratios does not.

The easiest way is to keep the Carriers and Cases with their intended ratio sets.

Edited by S pack, 23 February 2019 - 07:30 AM.

[claysummers]

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[MFM]

Today I removed my long bolt LSD centre (only because its wrong date code for my XU1) and it had 3:36 gears. Not sure why as reading forums suggest long bolt centres were only used for 3.08 and 2.78. So mabey it works this way but not the other i.e can't put 3.08/2.78 in a short bolt housing?

[S pack]

Today I removed my long bolt LSD centre (only because its wrong date code for my XU1) and it had 3:36 gears. Not sure why as reading forums suggest long bolt centres were only used for 3.08 and 2.78. So mabey it works this way but not the other i.e can't put 3.08/2.78 in a short bolt housing?

That is most likely the only way it works. You can put a 3.55/3.36 Case & gear set into a 3.08/2.78 Carrier. From memory it is the 3.08/2.78 crown wheel that is a fair bit beefier than the 3.55/3.36 so the Carrier is designed with more clearance for the crown wheel, hence the bulge and the two long bolts.

Edited by S pack, 24 February 2019 - 08:01 AM.

[grumpy xu1]

Hi there,
Can anyone shed some light on if I can do this or not?
So I’ve just picked up a bargain 3:36 lsd complete $100 and a single spinner 2:78 so what I’d like to do is get the lsd carrier from the 3:36 and put it in the 2:78 housing is that do able I can see the long bolt and short bolt housings. But as long as I keep the gear set with the right housing it should all be good right?
Cheers H

Sounds like you should just sell the centre to me for $200 + freight & your headaches gone mate. I wouldn't mind a cheap spare. Gary.

[hanra]

My housing which has two long bolts at 6 and 7 o’clock, previously had a 3.08 in it. It should have. 2.78 originally. But I have a 3.55 fitted to it. No modifications. Still using two long bolts.

[I'm a Red Motor fiend]

2.78 and 3.08 have massive pinions hence the different carrier (long bolt for more room. 2.78 and 3.08 won't fit in a short bolt carrier because of the large pinion. BUT, as Dave said, the cases are different due to the thickness of the crown wheels. 2.78, 3.08, 3.36, 3.55, 3.9 will all fit in a long bolt carrier as long as they are matched with their correct case.

[MFM]

Just put the single spinner in the car as its unlikely you will ever be able to break into a wheel spin if your car has an XU1 gearbox. That 3.36 LSD is worth keeping together as is probably worth $500 as they Are getting rare

[u1 71]

2.78 ratio banjo lsd were more common than the other ratios because they were predominantly used in the HK T G Brougham series try a diff or gearbox rebuilder in your area to see if they have any

[hanra]

I wish I could use my 3.55 LSD bits and convert it into a 2.78 LSD. But I believe the hemispheres are different????? I’ve got a 2.78 crown/pinion here. Would be much nicer that doing 3800 rpm @ 100kph.

[lawn bowls]

i have a 2.78 lsd corse spline banjo for sale if anyone is interested.

[liswar2]

Any one got a spare 3.08 LSD , as I'm running a 3.36 and it's too high for my 221/186 strocker in the Xu-1
Thx wazza

[mick_in_oz]

Brad, is no way the engine is doing 3800 @ 100KMh with a standard height tyre and a 3.55 gear set.

 

Taking a bit of a guess at the correct tyre height for a 175SR13 the car should be doing less than 3200 @ 100KMh, 3800 works out at a little over 120 KMh

 

I think I'd be checking the accuracy of the Tach, or the speedo.

 

To manage 3800 @ 100KMh takes in the order of 4.3:1 gear set with the standard tyre height (I'm using 23.6" tall as the height as an estimate)

 

As for the opening post, unless the car is gonna live on the highway I'd not even consider the 2.78, maybe 3.08, but really a 3.36 is a nice compromise between cruse RPM and speed, 3.55 is a little short for most people to be happy with, unless you're a lout or some such thing 

[hanra]

Sorry your right. I was thinking of my little red car which does 3800rpm @ 100kph. It has a 3.44:1 diff on 12in tyres with a 55 profile. Looks like the black car does 3000 @ 100kph.

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Edited by hanra, 14 May 2019 - 09:16 PM.

[mick_in_oz]

My Mini K did 145KMh stone motherless flat, no idea what RPM, no tach in the K, and the poor tired little 1100 screaming its head off, mostly in protest, they were some fun years while I had that 

[hanra]

Mine gets along pretty well. It’s probably under carb’d. It’s 1330cc with twin 1 1/4in SU’s. It does 8000 rpm in the first 3 gears effortlessly. Twin 1 1/2in SU’s are not cheap these days and I’ve invested too much into these 1 1/4’s. And I barely drive it anyways.

https://youtu.be/WfXziXqNGd0

Edited by hanra, 14 May 2019 - 09:47 PM.