Jack McNamara Air lockers

Post by **slr1968** » Mon Aug 30, 2004 3:03 pm

Has anyone bought or used one of these air lockers. Just after some feed back as to performance and life expectancy. How do they compare to the ARB equivalent?

Thanks

Post by **TuffRR** » Mon Aug 30, 2004 3:15 pm

Yes

I have a JM airlocker in the front of my RR and I reckon its great. What sort of vehicle is it for?

Post by **HSV Rangie** » Mon Aug 30, 2004 3:22 pm

Much better than arb.

Michael.

Post by **slr1968** » Mon Aug 30, 2004 3:28 pm

It’s to go in the rear of a HZJ 75 turbo Troopy. The Standard LSD has gone tits up and the repair cost is crazy so I figured it’s a good time to upgrade.

Post by **chimpboy** » Mon Aug 30, 2004 3:32 pm

I hear really good things about these. What vehicles are they made for?

Jason

Post by **bogged** » Mon Aug 30, 2004 3:40 pm

slr1968 wrote:Standard LSD has gone tits up .

std for yota ones after 20k klms. so dont feel bad.

Post by **Fieldsy** » Mon Aug 30, 2004 3:41 pm

http://www.mcnamaradiffs.com.au/home.html

Google :finger:

Post by **slr1968** » Mon Aug 30, 2004 3:44 pm

Not sure here is the link to the web site.

http://www.mcnamaradiffs.com.au/home.html

Post by **crankycruiser** » Mon Aug 30, 2004 9:34 pm

HSV Rangie wrote:Much better than arb.

Michael.

what makes them better than the ARB's?

Post by **ISUZUROVER** » Mon Aug 30, 2004 9:45 pm

crankycruiser wrote:
HSV Rangie wrote:Much better than arb.

Michael.

what makes them better than the ARB's?

AFAIK - they have a better design that is far less prone to compressed air leaks than the ARB. You can also get two different types - compressed air operated (like ARB) or engine vacuum (or low pressure air) operated, like the Maxi-Drive rover lockers.

Knowing JM's other stuff, they are probably stronger than ARB's too - not that ARB's usually have any problems.

Post by **DiscoDino** » Mon Aug 30, 2004 9:45 pm

They certainly have great products - I went with their axles, but decided to stick with ARBs because I'm 1/2 way around the world and need something "commercially available".

HSV has a lot of experience with them...

Post by **Slunnie** » Mon Aug 30, 2004 9:46 pm

I think the actuators are different.

Post by **Strange Rover** » Mon Aug 30, 2004 10:39 pm

Jac Mac locker has a one piece cross shaft instead of ARB 3 piece cross shaft. Jac Mac doesent have the rotating o-ring seal. Jac Mac doesent have the dinky plastic thing actuating the locker mecanism. Jac Mac has proper sized bolts holding the hemisphere together (instead of ARBs very small bolts that are smal because they are on the outside of the dinky plastic thing) That being said ARB are very bloody good and are a world wide product.

Probably the best user benefit is that the Jac Mac locker gives you an indication light that actually tells you if te locker is in or out (as opposed to ARBs where there is no tell tail and you always wonder if its really in or really out)

Sam

Post by **De-lux** » Tue Aug 31, 2004 4:34 am

how about price difference? is there any?

Post by **slr1968** » Tue Aug 31, 2004 8:21 am

For my 94 Troopy I was quoted $2200 for a complete center, new crown wheel & pinion, new bearings and the locker. The kit comes with all the plumbing, wiring and attaching hardware. The only other thing you need to buy is a compressor and a small tank.

Post by **HSV Rangie** » Tue Aug 31, 2004 8:40 am

JM more expensive.

$1300 for the air operated plus you need a comp.
and I think the vacume one is the same.

Sam has covered the differences.

Nothing wrong with the arb I just believe the JM is a better design and far stronger.

Michael.

Post by **ISUZUROVER** » Tue Aug 31, 2004 6:10 pm

HSV Rangie wrote:JM more expensive.

$1300 for the air operated plus you need a comp.
and I think the vacume one is the same.

I thought ARB were around the same price as that???

I am perfectly happy with my Maxi Drive locker, the only disadvantage is you can't increase the axle size above 24 spline.

Post by **DiscoDino** » Tue Aug 31, 2004 7:35 pm

I got my dual ARBs for 960 each (AUST conversion) - why is it more expensive in the country of origin?

Post by **ISUZUROVER** » Tue Aug 31, 2004 7:42 pm

I dont know. Mal Story (from maxi drive) once told me that ARB's were cheaper in the US than in OZ - so he couldn't sell his lockers there (but sells lots of axles to people who buy ARB's). He knew people who bought their ARB's in the US and brought them beck in hand luggage.

Post by **DiscoDino** » Tue Aug 31, 2004 7:49 pm

1st ARB I bought (2000) was at 544 USD shipped to my place which I carried as hand luggage to Lebanon
2nd was in Lebanon at 600USD
3rd & 4th were the above two in June this year in Lebanon...

Weird...

Post by **crankycruiser** » Wed Sep 01, 2004 11:53 pm

Well that clears that up then....

Post by **iwannabeapirate** » Thu Sep 02, 2004 9:58 am

DiscoDino wrote:I got my dual ARBs for 960 each (AUST conversion) - why is it more expensive in the country of origin?

My guess is a combination of tax, wages and expectations.

Everything in Australia is expensive.

For example, a lock-right only costs about $AUD3-400 if you buy it in the US but for some reason it costs about $700 here. I can't imagine it costing $300 to ship it here

.

Post by **HSV Rangie** » Thu Sep 02, 2004 9:59 am

I believe they manufacture over there.

greater demand = better pricing.

Michael.

Post by **tony cordell** » Thu Sep 02, 2004 8:58 pm

UK show price:
x2 ARB locker
x1 compressor
$3076 Aus

J/M starting to appear with some offroad suppliers now.
M/D difficult to source unless your determined
I paid for x4 shafts x4 drive members
$2256 Aus

everything is top price over here
2.8TGV international engine £5106-$13100 Aus
same engine shipped from Holland $10250 Aus

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