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Hey guys/girls,

I just popping in to see how much progress has been made on this crawler unit ? ? ?
Its seems to have died down abit.......

Anyone got any sucess yet ? ? ?



Cheers
Anthony
 

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The material to build the adapter runs almost $100 just for the stock (OK, it's about $65-enough to make two, $132.5). Also, for the life of me, I have not been able to source a suitable planetary unit. The off-the-shelf planetarys are very expensive...

That's where I stand...
 

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Discussion Starter #45
How about you Bill, any more info.

For those who don't know, portalrover - who just joined the board - is the guy who built the crawler adaptors shown above.

So Paul - it looks like Bill was right all along about the jeep T-case being the best option. So $65 for materials, but I'm guessing by far the biggest costs will be the machining and heat treating. So any idea on what you would have to sell them for to make it worth your while?
 

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I am not really in cognito. This is the only forum that I am registered with apart from outerlimits and the opportunity for another username presented itself. It is much more difficult and expensive in Australia to get small projects like this up and running. The only company I know that has the ten spline broach for both the Quadratrac and LT230 mainshaft spline adaptor is Jack McNamara Differentials and he is not interested. He is barely interested in making and selling his own stuff these days. Mal Story from Maxidrive Engineering could probably do it too but he is always flat out with difflocks, axles etc.You guys in the states seem to have access to many more specialist machine shops that are willing to take on small production runs at affordable prices. On one thread in General Discussion they were talking about making complete new transfercases for under a grand. Most Engineering shop operaters over here wouldn't give you the drippings off their nose for a grand. If I had the equipment I would make the conversion kits for wages but unfortunately since changing jobs 6 months ago I dont have access to the lathes,milling machines etc that would be necessary. A handfull of individuals and a couple of companies have PM,d me expressing interest in making a conversion but no progress seems to have been made and interest on this forum and Outerlimits appeared to die in the arse after I posted photos of my conversion, so I had basically forgotten about it.
I am still happy to advise anyone on the conversion where I can, but since it is not exactly rocket science I am certain there are quite a few of you who are quite capable of working something out.
Regards Bill.
 

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Actually, we have a newish member called incognitto. Who I think is D Ashcroft. I was daring him to pick up the underdrives again. I think he is lurking here again, we have not heard from him in awhile.
A plethura of information is he.

JP
 

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pendy said:
Actually, we have a newish member called incognitto. Who I think is D Ashcroft. I was daring him to pick up the underdrives again. I think he is lurking here again, we have not heard from him in awhile.
A plethura of information is he.

JP
Plethora, Methuselah. Plethora.

Your powers of deduction are impressive. In Cog Nito would be a suitable moniker for the man of gears. His knowledge of the P38 gearset and late model is uncommon for someone in NA. I too think you may be onto something.

D. Ashcroft, the jig is up...
 

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I dont mind who picks up the idea, but I would be very reluctant to risk any of my scarce financial resources to organise a small production run of conversion kits knowing that there are much better equipped concerns lurking out there ready to pounce on a good idea after somebody else has done the pioneering ground work. One could end up losing $$$$$$$$$$ as I did in the late 1970.s with difflocks.
Bill.
 

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portalrover said:
The only company I know that has the ten spline broach for both the Quadratrac and LT230 mainshaft spline adaptor is Jack McNamara Differentials and he is not interested.

Regards Bill.
My machinist associate (soon to be the newest Shopboy) suggested using EDM to cut the splines rather than a broach-the programming has already been done! :flipoff2: Even at $170/hr machine time, it should go quickly and not be prohibitive.

Curiously enough, it was Ike who inspired this idea with his broken CV joint.

I think it is a less than rocket science project, but as long as there is work in the shop, it's hard to justify to Shopgrrl working on such things. But, things have slowed down-let's hope it's just the election...
 

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If it is David a crawler box isn't on the cards as yet as far as I understand
but a new set of transfer gears may well be..
Apparently a couple of crawler boxes still exist is component form but the price is somewhat prohibitive at £1800
I'm waiting on a call from David re the new gearsets, if they fail to materialise I'll get a set of M/D crawler gears for the LT230 and live with 30% reduction.
 

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portalrover said:
I dont mind who picks up the idea, but I would be very reluctant to risk any of my scarce financial resources to organise a small production run of conversion kits knowing that there are much better equipped concerns lurking out there ready to pounce on a good idea after somebody else has done the pioneering ground work. One could end up losing $$$$$$$$$$ as I did in the late 1970.s with difflocks.
Bill.
Bill,
You are aware that they pioneered the underdrive with Land Rover parts in their design aren't you? Ashcroft I mean. If we could rub your method and theirs and maybe some more plentiful parts source we could get something going. I would like to see this happen like many here.
But the question is who would do it. Ashcroft once mentioned contracting someone to take over their method. But that does not seem to be happening.

You method is interesting but the parts are not very plentiful either for its approach.
Jim Pendleton
 

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Yes Jim, I am as surprised as Ben that you say the Quadratracs are scarce in the States. most of the interested members on Outerlimits in Australia have had little trouble locating them locally and Jeeps of that era were never really all that popular over here. I have suggested before on outerlimits that Rocky Mountain Products in Canada with their overdrive,already make most of the parts that would be required for the crawler conversion. I cannot understand why anyone would need an overdrive on a 5 speed LandRover unless it was on Mogs, but lower gearing is desperately needed on the TDI engined trucks.
Bill.
 

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Ok, now that i have read this entire post, someone needs to explain how this "gear reduction" works. I am guessing it is basically the same as an overdrive. I haven't actually gotten the chance to tear down an underdrive, so some of the info is still over my head. Thanks for helping a geartard.

Brad
 

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i agree that there are plenty of quadra trac units dead and alive around. But my understanding was you guys were using the low range unit that was attached to a small percentage of the Quadra tracs.

I will read the outerlimit post a little better.

JP
 

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Discussion Starter #58 (Edited)
pendy said:
i agree that there are plenty of quadra trac units dead and alive around. But my understanding was you guys were using the low range unit that was attached to a small percentage of the Quadra tracs.

I will read the outerlimit post a little better.

JP
7 years of jeep production not enough Pendy? Looks like you John (red90) will have to start calling you his minion.

red90 said:
Borg Warner 1339 QuadraTrac Transfer Cases were on 1973 to 1979 Jeeps with full time 4WD. The low range unit is a bolt on affair with gearing of 2.57:1. so you'd have a choice of 2.57, 3.32 or 8.53:1 low range.

http://www.jpmagazine.com/techarticles/23658/

 

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ISUZUROVER said:
7 years of jeep production not enough Pendy? Looks like you John (red90) will have to start calling you his minion.
No it is not.

A large percentage of NAS Jeeps with the quadratrac did not have the reduction box. They had no low range. Block off plate and just a regular gear.

This means that the chances of finding one aren't as great as you would think. I have not seen a Qtrack in a junkyard around here ever. But I have seen a late 50's VW bus and a few Morrisses. I can bet that they are going to be a bit scarce around here.

Easy killer. It is just starting to get civilized around here.
 

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I spoke with my new shopboy earlier today.

I need the specifics for the input gearing (helix angle, OD, number of teeth, ID and number of splines on the ID). He reiterated the earlier comment about using EDM to cut the internal splines, rather than a broach.

Now that I have some more to go on with respect to the Jeeps, I'll see if I can find a few of them.

Peace,
PT
 
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