100 Series Torsion Bar options (definitive table w/ part nos. and custom pre-order interest)

[cruiserpatch]

Howdy!

It's come to my attention thanks to the feedback from some Diesel 100 owners that the AHC HDJ100 torsion bars have been delisted. I'd like to help get some options back on the market for those wishing to upgrade or restore their Diesel 100 Series Land Cruisers (and in the future, for all us petrol owners once our bars go DISCO).

We've just filled our first pre-order of 10x sets of 27mm, 1160mm long UZJ100 w/ AHC 'Cruiser Patch' torsion bars.
We're also currently shipping our first run of 29.5mm, 1160mm long UZJ100 'Cruiser Patch' torsion bars. The following run will be finished in black and will be turned down to 29mm for those wishing to refresh their stock UZJ100.
Cruiser Patch is now offering OEM reproduction bars in 28.87mm diameter (1160mm long) for the UZJ100 platform.

Diesel 27mm AHC bars are now also available from Cruiser Patch

Pulling a lot of information from these threads:

• Toyota OEM Torsion Bar Spring Rates
• Custom Diameter Torsion Bar

What I'd like to know is this: if I open the floor to pre-orders for some 27mm, 1210mm long HDJ100 w/ AHC 'Cruiser Patch' torsion bars, is there enough interest in some beefier TBs overseas that I should go ahead and get an order going? I'd also LOVE to confirm the diameters and lengths of the OE & aftermarket bars listed below:



1160mm long Torsion Bar table for IFS 100 Series Toyota Land Cruiser and Lexus LX470 (UZJ100 only)

Part No. (LH, RH)	Frame (s)	Variant Details	Length (mm)	Diameter (mm)	Weight (kg)	% stiffness of OEM AHC bars*	Material	Notes
LH: 48162-60040 RH: 48161-60040	UZJ100	w/ AHC	1160	25.4	6.07	100%	-	OE U.S. spec w/ AHC
LH: 48162-60030 RH: 48161-60030	UZJ100		1160	28.87	7.79	~167%	-	OE U.S. spec
LH: 48162-60060 RH: 48161-60060	UZJ100		1160	**29.17	7.87	~174%**		(non-AHC)
Ironman4x4: TOY050-100LC	UZJ100		1160	32.45		~266%	"thick spring steel"	TOY050-LX470 (same part)
X-Sway (formerly Sway-A-Way): 1661	UZJ100		1160	32		~252%	"Solid aircraft-grade steel, heat treated"
Old Man Emu (ARB): 303001	UZJ100		1160	30.4		~205%	"premium grade spring steel"
TJM: 657025	UZJ100		1160	32		~252%	"premium grade spring steel"
Dobinsons: TB59-1600	UZJ100		1160	32		~252%	"heavy duty"
Cruiser Patch: 1661-CP27K	UZJ100	w/ AHC	1160	27		~128%	"Solid aircraft-grade steel"
Cruiser Patch: 1661-CP29.5K	UZJ100		1160	29.5		~182%	"Solid aircraft-grade steel"
Cruiser Patch: 1661-CP28.87K	UZJ100		1160	28.87		~167%	"Solid aircraft-grade steel"

**calculated by cross-reference of 48162-60030 with known weights (solve for X)

1210mm long Torsion Bar table for IFS 100 Series Toyota Land Cruiser (does not fit LX470)

Part No. (LH, RH)	Frame(s)	Variant Details	Length (mm)	Diameter (mm)	Weight (kg)	% stiffness of OEM AHC bars*	Material	Notes
LH: 48162-60010 RH: 48161-60010	HDJ100, HDJ101		1210	31.5	8.74	~236%
LH: 48162-60020 RH: 48161-60020	HDJ100, HDJ101	w/ AHC	1210	25.5	6.46	100%		Delisted (NLA)
LH: 48162-60080 RH: 48161-60080	FZJ100, HDJ100		1210	29.5	8.39
LH: 48162-60100 RH: 48161-60100	FZJ100, HDJ100	w/ OE winch	1210		8.39			Delisted (NLA)
LH: 48162-60120 RH: 48161-60120	HDJ100	w/ AHC	1210	25.5				Delisted (NLA)
X-Sway (formerly Sway-A-Way): 1660	FZJ100, HDJ100, HDJ101		1210	32		~248%	"Solid 4340 alloy steel, heat treated"
Old Man Emu (ARB): 303002	FZJ100, HDJ100, HDJ101		1210	32.8		~274%	"premium grade spring steel"
TJM: 657024	FZJ100, HDJ100, HDJ101		1210	32		~248%	"premium grade spring steel"
Dobinsons: TB59-1610	FZJ100, HDJ100, HDJ101		1210	34		~321%	"heavy duty"
Cruiser Patch: 1660-CP27K	FZJ100, HDJ100, HDJ101	w/ AHC	1210	27		~128%	"Solid aircraft-grade steel"

For those curious how the difference in spring rate is determined, here's our calculations/equation*:

[(TB^4)/(25.4^4)]*100 = % stiffness of OEM AHC 1160mm 25.4mm bar

*metallurgy also determines spring rate. Given the unknowns about each manufacturer's material, these rates are merely estimates.

 

[TLEXAS]

Hi Patch

Thanks for your efforts in organising the definitive torsion bar specification table and commissioning the build and supply of selected new bars. Torsion bars become a wearable item if you keep your vehicles on the road as long as us Landcruiser fan boys do. You can reindex a few times but eventually there is a degree of metal fatigue that must compromise the functionality of a torsion bar spring.

I enjoy the comfort of a working AHC system on my rig. I have reindexed the torsion bars, replaced the spheres once and fluid twice in the system in 600,000 plus kms so believe that is reasonable for the time and distance travelled. My torsion bars are getting tired and my belief is metal fatigue is compromising their function. I also have an ARB summit bar on the front which adds a little more weight to carry. What I have found recently is that there is no replacement torsion bar available for my diesel AHC equipped Landcruiser (25.5mm x 1210mm) from Toyota, Amayama or PartSouq. All the aftermarket torsion bars are 30-32mm which is too stiff for my AHC equipped rig.

Your special orders currently available for petrol AHC (27mm) and non AHC (30mm) are 1160mm so great for you petrol heads.
Us rolling coal types (diesels) need 1210mm long torsion bars in the following specs AHC (27mm) and non (AHC 30mm)
The 27mm spec for my AHC equipped diesel gives me a little more grunt over the OEM 25.5mm original to account for the extra weight of my ARB bar without going too stiff and compromising my AHC system.

Please receive my confirmation of interest in a set of 1210mm torsion bars at 27mm for my diesel 100 series equipped with a functioning AHC system.

Thank you for your support to the I8MUD community

 

[dstar]

Patch, as a new owner of a 1998 HDJ100L w/o AHC, you have my attention. I am dealing with the discontinued issue with other parts now. Working through it but I am interested.

 

[cruiserpatch]

I've copied this information into a page on our website so folks can view it sans-ads:

100 Series Toyota Land Cruiser & Lexus LX470 Torsion Bar Comparison Ta

100 Series Toyota Land Cruiser & Lexus LX470 Torsion Bar Comparison Table See also the ih8mud thread Part No. (LH, RH) Frame Variant Details Length Diameter % stiffness of OEM AHC bars* Material Notes LH: 48162-60020RH: 48161-60020 HDJ100 w/ AHC 1210mm 25.5mm 100% - Delisted LH: 48162-60010RH...

www.cruiserpatch.com

 

[jim37]

+1 here. I'll express my interest in a set of diesel AHC bars (1210mm x 27mm thick)

Have a 2001 HDJ100R with functioning AHC that is going to be kitted up for a trip from London to Cape Town next year. Planning to keep AHC for the comfort as we will probably see more washboard than hectic trails.

I like the idea of 27mm bars that could take slightly more weight with bumpers/winches installed and also possibly be cranked up a bit in the event of an AHC system failure to keep the car on the road until repairs can be carried out.

Hopefully shipping them to the UK doesn't double the price...

 

[cruiserpatch]

I'll be shipping these in pairs via long, tubular boxes. For example, our 1160mm petrol bars get shipped via a 4"x4"x48" box with a final weight of just under 14kg

The 1210mm will need a slightly larger box but the same principles apply- I'm sure you could go ahead and get some rates calculated to your address using that info^

 

[Edwardsrealtor]

I know I am needing to upgrade my stock LX torsion bars, but am struggling to understand the best choice options. I have deleted the AHC, Steel front bumper/ 12k winch w steel cable/ Dual battery setup / 863 rear springs / 35in tires. I have read so much contradictory information between the Ultimate torsion bar sticky to other posts and YT videos. If I under stand the science correctly, On the soft side of things (Current LX Setup & OEM LC TB) I will need to preload/index more to accommodate my Front end additions vs the thick Ironman will require significantly less preload and may feel softer on small bound/rebound bumps, but as the TB twist into full bound (compression) stroke the ride harshness increases significantly. Please correct me if I am wrong. Thx

 

[cruiserpatch]

The thicker the bar the less easily it will flex in low-speed compression situations but the less pre-load will need to be applied especially for heavier trucks.

For on-road behavior, thick bars (30mm+) sag less (i.e. minimal front end dive when braking). For off-road behavior, the thick bars reduce usable front end up-travel significantly (which on a 100 is already extremely limited).

I run small diameter bars to maximize my front end travel especially when getting my truck into flexy/bound up situations.

 

[cruiserpatch]

Had the opportunity to suggest to a local customer my new 29.5mm torsion bars for his 1998 Land Cruiser VX Limited.

He's deleting AHC (sad) and purchased the Ironman4x4 kit which included the 32mm bars (also made by X-Sway- where I source mine).
His 100 is fairly stock minus wheels and tires. His truck is actually lighter than a stock 100 since he does not have the third row seats.
32mm Ironman bars would have been overkill.

The side-by-side comparison was quite interesting.

Left to right: Ironman 32mm, Cruiser Patch 29.5mm, OEM 28.87mm (non-AHC petrol), OEM 25.4mm (AHC equipped petrol)

 

[excessive]

wow, i had no idea there were so many options. I am happy with my ironman TBars, but i did have take them on/off to re-index them about 2 times to get the setup just right. Annoying, but that's what happens when you start adding lots of weight ( bumper, winch, sliders, heavy rooftop , etc )

 

[FairZ33]

I know Patch has a ton of weight on his LX and was using LC bars. What amount of additional weight justifies beefing up to some of the bigger bars, such as the Ironman? I just put an ARB front bumper on my non-ahc cruiser, am I ok on the stock t-bars?

 

[cruiserpatch]

Here’s a summary of my most recent weight reading from a recent road trip.

Truck was loaded with a full tank of gas, myself and my wife in it. When camping we would probably bring an additional 50-100lbs of gear I’m sure but this was a really heavy number to be honest- I was surprised at it.

That said, the 29.5mm bars under my truck feel perfect. I indexed the driver’s side by two splines and the passenger’s by one

I honestly see absolutely zero reason to run Ironman TBs or anything thicker than OME’s 30mm bars. If your 100 weighs more than 8,000 lbs you should consider a 200, IMO

 

[FairZ33]

I was doing some shopping around and found that Dobinsons's TBs 59-1600 and 59-1610 are 32mm and 34mm thick, respectively. Sourced from ExitOffroad. Hopefully this helps you fill out your chart in the OP.

 

[cruiserpatch]

First batch of 27mm bars are arriving to me today. Will be shipping out tomorrow.

Pre-orders are still open for batch #2
(10x spots still available- I'll place another order as soon as I have 2x pre-orders)

 

[NCMTNS]

@cruiserpatch - All great info; thanks for sharing. I am in process of replacing the suspension (was actually AHC but was removed by previous owner and he put in cheap shocks/springs) with aftermarket shocks/springs (Bilstein B8 5160's and OME 2865 springs) but also adding front ARB bumper with winch. Goal is to get about a 2" lift. I was very indecisive on whether to keep the original torsion bars (they are the OEM "AHC" torsion bars) or go aftermarket. I went ahead and got the ARB OME 303001 as I thought with 305,000 miles, no more AHC, and adding weight to the front it was best to replace with a slightly larger OD torsion bar. But now reading all this I'm worried if it will be too stiff? The LX470 is being setup for more overlanding than rock crawling so was still looking for a good ride but a suspension that could handle the extra weight.

I guess what I could do is do all the updates, crank up/reindex the existing AHC torsion bars and see how it rides? I could always come back and upgrade if needed. Unless the AHC torsion bars on now are undersized for my added weight?

 

[LowDrag82]

@cruiserpatch I just got my first 100 series few years ago, and now I’m ready to add a ARB front bumper and rear drawers. Already have WKOF sliders. When Lexus replaced all the globes and fluid for the ahc system they leveled the truck out but I noticed that the passenger side torsion bar was screwed up basically the whole amount you can turn it. The ride is rougher on that side now, so my question is:

Should I re index the existing 20 year old torsions bars now, or when the arb bumper goes on, or do you think I should get those 27mm ones you’re offering and replace the old torsion bars when the bumper goes on?

I’m learning as I go along, but I don’t know the best course of action to take for this.

 

[Edwardsrealtor]

If anyone chooses to upgrade their stock LC bars, and lives in AZ, I would love to take them off your hands.

 

[x8o8drifter]

@cruiserpatch I just got my first 100 series few years ago, and now I’m ready to add a ARB front bumper and rear drawers. Already have WKOF sliders. When Lexus replaced all the globes and fluid for the ahc system they leveled the truck out but I noticed that the passenger side torsion bar was screwed up basically the whole amount you can turn it. The ride is rougher on that side now, so my question is:

1. Should I re index the existing 20 year old torsions bars now,

2. or when the arb bumper goes on, or do you think I should get those 27mm ones you’re offering and replace the old torsion bars when the bumper goes on?

I’m learning as I go along, but I don’t know the best course of action to take for this.

1. Useless without the pressures. Sounds like after the replaced the globes and put new fluid your front passenger pressure might be to low now. (IE: riding on just the spring/torsion) and you now need to crank it back down, but without those pressures, who the f*** knows.
And unless one of the height sensors brackets was broken or the front ones are off (very different lengths), its going to be correct. So its likely they didn't do anything.

2. Answer 1 first to see if doing them now vs later matters.
But I also had kinda the same question. No drawers but F/R bumpers, skids and sliders.
Getting his 27mms and the King AHC springs he sells.

But unless you can get something that can read the pressures, messing with the system at all is a crapshoot unless you KNOW the other person touching the AHC knows how the system works. And from what I've seen, most places don't. That includes Toyota/Lexus dealerships.
Best bet if you cant/wont do it yourself is to take it to a cruiser specialist.

100% those places can get the torsions and the springs swapped, but I'd be wary on having them "adjust" anything.

 

[cruiserpatch]

Should I re index the existing 20 year old torsions bars now, or when the arb bumper goes on, or do you think I should get those 27mm ones you’re offering and replace the old torsion bars when the bumper goes on?

Like @x8o8drifter said, without the AHC pressures, you're basically taking a stab in the dark but based on my experience, overweight (800+ lbs over stock) AHC systems will not be too happy with 25.4mm bars even if they're indexed.

For now I would index your bars by 1-2 splines and see if the ride improves (this assumes you don't have a way to measure the pressures). If you're planning to add weight in the near future, you may just want to wait so you're not removing and installing your torsion bars every two weeks...

The next shipment of 27mm bars are arriving next week so they will be here just in time for you. Long term once you add the weight I would advise you purchase a set of 27mm torsion bars if you plan to keep AHC.

FWIW I would highly recommend figuring out a way to track your pressures if you do plan to keep AHC. Makes everything more measurable and predictable.

 

[cruiserpatch]

If anyone chooses to upgrade their stock LC bars, and lives in AZ, I would love to take them off your hands.

I have 8x sets of "OEM reproduction bars" in stock if you want a brand new set.