Add-a-Leaf Lifts and Part Numbers

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Add-a-Leaf Lifts and Part Numbers

Postby nasty610 » Fri Apr 01, 2016 7:45 pm

A long time ago in a galaxy far far away someone came up with the idea of using strips of bent metal as a spring. Not too long after that someone else put them under a 4wd and we ended up with leaf packs. Then this other guy decided if he shoved another leaf in there it would lift his 4wd. From then on that guy was famous.......well not really but something similar happened and we ended up with the Add-a-lead lift.

So how does it work? The answer is on Google somewhere but not in this thread.

Anyways, as far as I know there is only a couple places that sell an AAL specifically for Isuzu. At least they say it's specifically for Isuzu then charge out the butt for it. While it sucks that's the price to play in a vehicle the aftermarket doesn't support. Most of these are around half what the "Isuzu" specific AAL's cost.

Being the super nice guy I am I compiled a short list. Aftermarket companies are surprisingly tight lipped on their spring specs. Most of them are for 2.5" wide springs because SURPRISE!!!! most trucks and SUVs use 2.5" springs. Isuzu, and another much less famous brand that starts with a T, use 2.375" wide springs. There's a reason but again you'll need Google to find it. Just so everyone knows you CAN stick a 2.5" spring in a 2.375" pack. It takes 3-4 beers, lots of swearing and a hammer or big clamp. I may be wrong on the beer so buy at least a 24 pack.

Unlike my Coil Spring thread I'm can't tell you how much lift you'll get from a particular spring. The main reason is I don't know the weight on the rear axle of a 1g Trooper, Amigo or Rodeo. I'm going to make an educated guess on the Trooper. Just remember the key word in that sentence is GUESS. If you happen to know the weight on each axle of any of these vehicles post it or PM me.

Ok so I'm GUESSING a 1988-1991 Trooper has roughly 1510 lbs supported by the rear axle. Just so no one screams foul I used a highly scientific method and the v6 since the number was easy to find.

[Curb weight - engine weight] / # of axles - rear axle w/ brakes = weight on axle(RA)
[3370 - 350] / 2 - 200 = 1510

Keep in mind leaf packs get progressively STIFFER as they compress. I'm sure there's an equation to account for it but I DID NOT attempt to find it. This means all lift numbers should be on the low side.

The arch of the AAL will play a large role in how much lift you'll get. If two springs have an equal rate the one with more arch will always give more lift.

Another thing worth mentioning is that these springs can be trimmed down to increase their effective rate. That's why I included Pro-Comp P/N 13124-1. At 50.75" long it's more than 3" longer than a Troopers main spring. When cut down to 45" the rate jumps to 78.34 lbs/in. Take it down to 40" and the rate shoots to 111.54 lbs/in. So you're better off picking a longer spring with a lower rate then trimming it down to get the height you want.

When trimming a spring down there's a few things you can and CANNOT do. You ABSOLUTELY CANNOT use a torch to cut down a spring. Someone is going to contradict me on this and they are so full of s*** it's not even funny. Cutting a spring like that ruins the temper and it will fail, sometimes catastrophically.

The correct way to do it is with a saw of some sort. Once it's cut down you should use something to round the end off. A flapper wheel works best. This will help prevent it from eating into the springs it sits against. Before you blindly cut always run the numbers through a calculator. It'd be a shame to hack 7" off a brand new AAL only to realize the rate is way too high.

This is the calculator I use and it has proven pretty accurate.

A good starting point for the rate is 25-30% of the Stock Trooper rate. Without the overload it is 140.77 lbs/in. We don't count the overload because it should only come into play under heavily loaded conditions

ALWAYS USE A BRAND NEW CENTERING PIN
Remember if it's in big bold letters it's probably important.

BDS
114202--arch 6.75"--length 42"--width 2.5"--thickness .26-- 51.68 lbs/in---1.4" lift

Rancho
Rs60622--arch 7"--length 45.75"--width 2.36"--thickness .26--rate 37.75 lbs/in---1.1" lift
Rs60613--arch 6.75"--length 44.76"--width 2.5--thickness .26--rate 42.7 lbs/in---1.25" lift
Rs60632--arch 6.25--length 42.75"--width 2.5--thickness .26--rate 49 lbs/in---1.3" lift
Rs60013--arch 8.65"--length 45.65--width 2.5"--thickness .32"--rate 75 lbs/in---1.8" lift

Pro-Comp
13160-1--arch 6.75--length 45--width 2.5-- thickness .25--rate 37 lbs/in---1" lift
13124-1--arch 7.62--length 50.25--width 2.5--thickness .32--rate 54 lbs/in
13120--arch ???--length 21"--width 2.375"--thickness .25"?--rate 349.17 lbs/in
Last edited by nasty610 on Wed Apr 06, 2016 5:56 pm, edited 6 times in total.
1996 Isuzu Trooper Base model
Front t-bar crank, Rear lifted with 1st gen Grand Cherokee Coils, Cooper Discovery AT3 265/75R16
1991 Trooper Base Model
HD Sway-a-Way torsion bars, Sweet Camo Paint(adds 50 hp), Snowflakes w/ Firestone Destination LE2 265/75r16
Lift Coil Spring Options
Add-a-Leaf kits and Part Numbers
Longer Shocks for your Lifted Isuzu

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Re: Add-a-Leaf Lifts and Part Numbers

Postby gwana66 » Fri Apr 01, 2016 11:00 pm

This is why I love this place. Great info!
98 Amigo, 2.2 5sp 4x4, 4.77 gears and factory LSD.
Power nothing - No power windows, no power locks, no power engine. ;)
Even the hubs are manual now.
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Re: Add-a-Leaf Lifts and Part Numbers

Postby Beamer » Mon Apr 04, 2016 3:54 pm

Nice work!
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Changes; Indy4x HD torsion bars, OME springs, indy4x shackles, Indy4x ball joint flip/spacers, Warn hubs, sway bar bushings. New polyurethane boots for ball joints, and Mecatech boots for CV joints. Shock post extensions, shock boots, low profile bump stops.
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Re: Add-a-Leaf Lifts and Part Numbers

Postby geoffinbc » Tue Apr 05, 2016 3:02 am

I second the no torch policy. It will anneal the steel and make it useless. Use a zip cut. It's more accessible anyway. If you have a fancy dancy shop you could set a spring up on a water jet table. Under water plasma or laser would be acceptable too. But seriously those options are crazy since we're talking a 2.5" long cut lol.
1990 Trooper, 3.2L (3.1L .040 over) Pushrod V6, 5 speed manual. 33X10.50X15 BFG M/T KM2's. 3" OME Lift. Cowl Induction Intake. ARB Lockers front and rear. HD Tierods.
Off the road for an overhaul right now.

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Re: Add-a-Leaf Lifts and Part Numbers

Postby oldestisuzuist » Tue Apr 05, 2016 9:50 am

geoffinbc wrote:I second the no torch policy. It will anneal the steel and make it useless. Use a zip cut. It's more accessible anyway. If you have a fancy dancy shop you could set a spring up on a water jet table. Under water plasma or laser would be acceptable too. But seriously those options are crazy since we're talking a 2.5" long cut lol.

I used a portable band saw to cut the last two springs I shortened. A reciprocating saw would probably also work. Yes, they are harder than mild steel, but not excessively so. The advantage of a saw over the zip disc is no sparks.
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'87 Trooper, 2.3, headers, 5-spd, 31's, ball joint flip, Aussie Locker rear, Superwinch hubs, brush guard w/5.5K winch, needs motor, work in progress.
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Re: Add-a-Leaf Lifts and Part Numbers

Postby leftarmtan » Tue Apr 05, 2016 1:52 pm

I'm using the Pro Comp EXP-13120 add a leaf (short length).$36.99 for the pair,worked well for my application which is 89' Trooper rear springs up front SAS.
89' trooper SAS 4.3
April 2014 ROTM
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Re: Add-a-Leaf Lifts and Part Numbers

Postby nasty610 » Tue Apr 05, 2016 2:22 pm

I didn't see that one when I pulling part numbers. Any chance you know the length and thickness?
1996 Isuzu Trooper Base model
Front t-bar crank, Rear lifted with 1st gen Grand Cherokee Coils, Cooper Discovery AT3 265/75R16
1991 Trooper Base Model
HD Sway-a-Way torsion bars, Sweet Camo Paint(adds 50 hp), Snowflakes w/ Firestone Destination LE2 265/75r16
Lift Coil Spring Options
Add-a-Leaf kits and Part Numbers
Longer Shocks for your Lifted Isuzu
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Re: Add-a-Leaf Lifts and Part Numbers

Postby leftarmtan » Tue Apr 05, 2016 2:37 pm

21"long 2 3/8" wide
89' trooper SAS 4.3
April 2014 ROTM
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Re: Add-a-Leaf Lifts and Part Numbers

Postby nasty610 » Tue Apr 05, 2016 5:36 pm

Any chance you can get the thickness as well?
1996 Isuzu Trooper Base model
Front t-bar crank, Rear lifted with 1st gen Grand Cherokee Coils, Cooper Discovery AT3 265/75R16
1991 Trooper Base Model
HD Sway-a-Way torsion bars, Sweet Camo Paint(adds 50 hp), Snowflakes w/ Firestone Destination LE2 265/75r16
Lift Coil Spring Options
Add-a-Leaf kits and Part Numbers
Longer Shocks for your Lifted Isuzu
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Re: Add-a-Leaf Lifts and Part Numbers

Postby leftarmtan » Tue Apr 05, 2016 6:01 pm

Looks to be the same thickness as stock springs,about 1/4"
89' trooper SAS 4.3
April 2014 ROTM
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Re: Add-a-Leaf Lifts and Part Numbers

Postby nasty610 » Wed Apr 06, 2016 5:51 pm

If anyone has installed an AAL that's NOT on the list please PM or post the Part Number, Length, Width and Thickness. I'd like to add to this list and its dang near impossible to get this information from the retailers.

Anyone that installs or has installed one from the list post up. How much lift did you net? Does it ride well or like a truck? How much, if any, did you trim? Pictures would be awesome too.
1996 Isuzu Trooper Base model
Front t-bar crank, Rear lifted with 1st gen Grand Cherokee Coils, Cooper Discovery AT3 265/75R16
1991 Trooper Base Model
HD Sway-a-Way torsion bars, Sweet Camo Paint(adds 50 hp), Snowflakes w/ Firestone Destination LE2 265/75r16
Lift Coil Spring Options
Add-a-Leaf kits and Part Numbers
Longer Shocks for your Lifted Isuzu
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