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EOI - True tac and 28 spline billet axles to suit banjo diff LJ/LC

Started by _Agent 34_ , Aug 06 2014 05:58 PM

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87 replies to this topic

#1 _Agent 34_

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Posted 06 August 2014 - 05:58 PM

Please read carefully.

I have been investigating the below set up for my race car;

true trac center 28 spline and 28 spline axles (new) not re spline axle
I have spoken to both reputable companies about the respective products and they are available. Both companies are very well versed in this engineering environment with race cars.
At this stage I am putting it out there to any non D#%ckheads who would be interested in getting the above setup either to replace the standard holden offering of the LSD banjo.
At this stage the above set up is sitting somewhere between under 2K depending on numbers which is pretty good given the quality.
You will never break this set up.
The terms of the deal are;
Step 1 - you need to PM me only with your name address and phone number - i will then call you to discuss.
Step 2 - I will then add you to the list as a number on the forum
At this stage we seem to have 4 persons interested. But this will be confirmed.

FFS - please don't be a tool and add shit here for the sake of it as i will have to manage it. The two companies are Harrop and also Bosnjak engineering - Please don't ring up and pester these people as I have been in contact with them.

Stick to the format of PM to me.

This is a two staged process;

Stage 1 - buy centers - deliver to customer - can be delivered direct

Stage 2 - get axles made - deliver to customer - GH to pick up and then deliver or purchase to arrange courier at own expense

Money to be put into bank accounts prior to order being placed and also 50% of the second stage.

This should give parties time to save up.

I am limiting this offer to GMH members to 6 at this stage as we already have 4 people and 10 will be enough for me to organize.

Postage is on you.

this will be open for 2 weeks and then the decision on numbers will be made and the cut off period.

G

Numbers at this stage 4 - 6 spaces left

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#2 RallyRed

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Posted 06 August 2014 - 06:10 PM

.

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#3 looznugtr

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Posted 06 August 2014 - 06:36 PM

I just bought this same setup.
At diff shop being assembled now.

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#4 jd lj

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Posted 06 August 2014 - 06:59 PM

I'm not after one myself, but good work grant, nice of you to put the offer out there for forum members.

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#5 _2ELCS_

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Posted 06 August 2014 - 08:29 PM

That's good buying Grant..

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#6 _Agent 34_

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Posted 07 August 2014 - 05:38 AM

I'm not after one myself, but good work grant, nice of you to put the offer out there for forum members.

James there may be no one who is interested in doing it, but I'm sorting it out for myself so I may as well pass on what I'm doing.

That's good buying Grant..

Yes Wayne, i didn't want to reveal the lowest price, as this will be misleading, but it could be around the $1600 mark depending on numbers and I'm aiming for 10. that's for 28 spline

.

So if anyone is interested in the range it's $1600 and upwards

you will not get a better price any where for this.

FYI

A Detroit locker is $2100 brand new alone + axles - second hand $1500 ish

buy an LSD banjo $500 + rebuild $500 is still a shit LSD with 10 spline axles

if you want a 2.78 - 3.08 is one carrier center then a 3.36-3.55 is another carrier center - so if you want to change ratios then you need two carriers , pretty sure that with the tru trac you just change the crown wheel and pinion and there is no need to modify the back plate which is what has to happen in the banjo if you want to keep the center - ill check that fact today.

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#7 TerrA LX

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Posted 07 August 2014 - 08:22 AM

I really don't want to spend any more money on a bango, but just for shits and giggles, are these diffs any good for a real torana with 300+ hp or are they just suited to the little brother with a 6banger?

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#8 _Agent 34_

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Posted 07 August 2014 - 01:04 PM

I really don't want to spend any more money on a bango, but just for shits and giggles, are these diffs any good for a real torana with 300+ hp or are they just suited to the little brother with a 6banger?

Terra,

thanks and I have spoken to Ben from Harrop today. He has stated the following;

" if it's a full blown burn out car or a full drag car then we would suggest a detroit locker or a full spool, but for a good street with 500 hp and a daily then these are fine"

The question is always how much of a hard time you will give it, but i would suggest that a center with billet axles and also 28 splines will take a good beating, the axle specs I don't have , but have seen the work on a separate set of axles.

Whilst i have not had a detroit , I have spoken to people ( 2elcs) about them, there is nothing wrong with them, but may be a bit harsh for a daily. Also I wanted a local product that was off the shelf.

The 9 inch is the king, but too heavy for a little 6 to drive, This was a " no engineering set up " that didn't need a engineer certification at the end which i though was good. Axles are made locally in NSW.

hope this helps answer the question.

Im no expert on diffs and this is all new, but am working through the issues.

G

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#9 _Agent 34_

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Posted 07 August 2014 - 01:06 PM

Sorry guys, I should note that the original post should have also included the facts that I have a price on 10 spline as well which is a straight swap and in the original discussions with Harrop the breakdown was;

7- 28 splines

3- 10 splines.

so either is fine with me.

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#10 _Agent 34_

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Posted 07 August 2014 - 05:16 PM

5 confirmed.

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#11 _2ELCS_

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Posted 07 August 2014 - 10:16 PM

Just my 2 bobs worth...go the extra mile and get the 28 spline axles...

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#12 warrenm

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Posted 08 August 2014 - 07:52 AM

If your going to spend money to make the diff stronger, go to 28 pline axle don't use 10 spline, as 2ELCS has already mentioned.

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#13 TerrA LX

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Posted 08 August 2014 - 09:00 AM

Thank you for the reply Grant, one more question if I may? Has the problem of locating the centre to the housing to prevent it from rotating been addressed?
I would hate to see all this money thrown at a bango without one of the main in inherent problems of the design addressed.

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#14 _Agent 34_

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Posted 08 August 2014 - 03:15 PM

Terra LX,

thanks and maybe we can expand on that problem here as this has not been brought to my attention.

I assume that you are referring to the two surfaces being " smooth " the center and the housing machined surface. and thus the center is either rotating forward or backwards depending on the power applied , Yes ?

Terrra, i have another person who is getting axles for a LX " HQ pattern" and a 28 spline.

happy to discuss further, it's probably not an issue for a 6 , but maybe for an 8 with high hp.

just tighten it up a bit more !

Edited by Agent 34, 08 August 2014 - 03:20 PM.

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#15 TerrA LX

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Posted 08 August 2014 - 04:14 PM

The inherent problem with a banjo, whether it be the piss weak holden excuse or the fraud 9" is that the centre is prone to rotate (not move back or forth) on the mating surface.
It is not such a big problem with a 9" due to its physical size allowing greater clamping area and pressure but the little bango does suffer.
This is partly due why stronger diffs of similar size are usually the Salisbury type, such as the UC diff, the Holden Salisbury, the Borg Warner, the chev 10 and the larger 12 bolt, dayna etc etc...

Edited by TerrA LX, 08 August 2014 - 04:15 PM.

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#16 _2ELCS_

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Posted 08 August 2014 - 04:53 PM

Never had that problem with a banjo Terry..they do tend to try and pull the mating surface away from the housing though....

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#17 _Agent 34_

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Posted 08 August 2014 - 05:34 PM

Just to keep going on this;

This is a clutch type " sure trac" which has clutches

And I believe that this is a true trac mechanical

they are very different in the engineering principles

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#18 TerrA LX

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Posted 08 August 2014 - 05:39 PM

Never had that problem with a banjo Terry..they do tend to try and pull the mating surface away from the housing though....

And when they do the rotate, I'm talking thousands of an inch, enough to side load the axle gears.

Not to mention that the bolt up area is quite weak.

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#19 _Agent 34_

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Posted 10 August 2014 - 01:42 PM

6 at this stage.

4 spots left.

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#20 _Agent 34_

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Posted 12 August 2014 - 06:28 AM

7 spots ( orange LJ) put u in

3 spots left

GTR 675
Rally Red
Milan S - gtr xu1 owners club
agent 34
Kockum
A9x - welby
Orange lj in but to fully confirm.

Technical update.

I have spoken to terry and he needs the following details for each of you;

1) what brakes are you running

2) what wheels are you running - need to measure the centering hole so the axles can be made specifically to locate the wheel on the axle end correctly

I will measure a sprintmaster I have in the garage and also a standard wheel and post up.

Also after discussions yesterday with terry it has been decided for Bosnjak to provide;

full billet axles
HD retaining plates
wheel studs
bearings

on all the finished product axles ready to ship out, it was just better.

one more week and then the orders will be placed, I'm thinking of getting the axles made first,

Edited by Agent 34, 12 August 2014 - 06:28 AM.

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#21 TerrA LX

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Posted 12 August 2014 - 08:39 AM

I didn't realize Terry Bosinjak was doing the engineering, he was the other person who suggested the Borg Warner to me at the time, 20yr ago, when I was chasing up quotes beefing up the banjo.
He actually quoted me on the Borg Warner conversion.

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#22 GTR469

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Posted 12 August 2014 - 08:04 PM

Grant, ill give you a ring tomorrow with details

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#23 RallyRed

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Posted 13 August 2014 - 03:46 PM

Hi Grant,

Thanks for continuing to follow this up...
Answers -

1. My brakes are stocko.

2. My wheels are as follows....

My Hotwires have lip in this area such that the hole the the decorative cap fits into, is smaller than the hole where the end of the axle sits.

My measurements suggest the answer to your question is 76mm.

Some pics follow to make sure we are talking the same thing....

Attached Files

13 x 7 Hotwire axle hole.jpg 325.34K 6 downloads
13 x 7 Hotwire axle hole from rear.jpg 238.39K 5 downloads
13 x 7 Hotwire axle hole from rear measurement.jpg 243.73K 5 downloads

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#24 RallyRed

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Posted 13 August 2014 - 03:55 PM

..not sure if it is relevant, but my spare sprintmasters, look like 68mm.
Thus it may be relevant to those that are running sprinters, but could run Hotwires later, too get the
axle to suit????