How About an FAQ Thread

[Uzi]

Got to thinking we should start an FAQ for the Isuzu board. Just Basic stuff like the type of motors, trans, t-cases, axles, ratios...all the stuff that people usually ask about but dont' take time to search for. Maybe that would save on posts like what axle or motor do I have. I known because in the past I asked questions like that, if we could get an FAQ thread at the top that says something like read this before posting I think it would be helpful to newbie or people with questions about zu parts. Just My $.02

[paulevans76]

TROOPERS

Pre-89's came with a 2 door LWB option, but 89 and after didn't.

Pre-87's had the round headlight grill.

Pre-88's had the carbuerated 4 cyl's (84 and 85 I believe had the 1.9, and 2.3 after that)

88 and up had the EFI 2.6 and 89 and up had the optional 2.8, and I believe somewhere I heard of some (maybe canadian) 91's had 3.1's.

84-87 had the 8 bolt/10 bolt (talk of some 87's with a 10/10 combo)

88 and up had the 10 bolt/12 bolt

I dont know for sure, but I think the auto's weren't an option until 88.

84-85 I think had the 4 spd, 86 and 87 had the 5 and a totally different t-case than the 88 and later MUA5.

Diesels in 86 (maybe 85, dunno)


Paul

[paulevans76]

gear ratios for troopers are 4.56 (common) and 4.77 (RARE). The 89 SWB 2 dr RS model will always have them. Look for the 'snowflake' wheels on the other models as that usually means they have the 4.77's.

5.38's are available thru tera as well as 3.07:1 low range gears for the MUA5 trans/t-case

[Independent4x]

holy crap...................where to begin

i will start with a little diff info:


Some more info on the 10 bolt front vs. 10 bolt rear...


THE RING GEARS AND THE PIONION GEARS ARE CUT
BACKWARDS FOR THE FRONT END, HOWEVER THE CARRIER THAT THE RING GEAR BOLTS TO IS THE SAME ON BOTH THE 10 BOLT FRONT & THE 10 BOLT REAR. THEY USE THE SAME BEARINGS FOR THE CARRIER AND THE PINION GEAR.

THE 10 BOLT REAR WAS THE STANDARD SIZE ON ALL PICKUPS AND TROOPERS FROM 81 THRU 87 AND SOME PICKUPS UP UNTIL 95, DURING THIS TIME PERIOD THE FRONT WAS, I BELIEVE, AND 8 BOLT RING GEAR.

STARTING IN 88 THE REAR WENT TO A 12 BOLT REAR AND A 10 BOLT
FRONT. THE NEW 10 BOLT FRONT, THE DESCISION TO USE PARTS OF THE REAR END DESIGN IN THE FRONT END WAS STRICYTLY FROM A COST CUTTING STANDPOINT.

ALSO THE LIMITED SLIP THAT WAS USED IN THE EARLY 10 BOLT REAR COULD BE USED IN THE NEW 10 BOLT FRONT WHICH ACTUALLY CAME FROM THE REAR DRIVE TURBO IMPULSE. THE IMPULSE HAD THE TRUCK REAREND WITH COIL
SPRINGS AND 3.90 GEARS.

ALSO THE HOUSING FOR THESE 2 10 BOLT DIFFS ARE COMPLETELY DIFFERENT. ONE HAS AN OFFSET FOR THE FRONT AXEL AND FOR THE FRONT SUSPENSION.



FURTHER ANSWERS:

ON THE GEARS: THE RING GEAR ON THE REAR IS THICKER THAN THE ONE ON THE FRONT. EVEN THOUGH THEY ARE THE SAME DIAMETER AND RATIO.

THIS WAS DONE IN ORDER TO MOVE EVERYTHING CLOSER TOGETHER SO THE
DIFF WOULDN’T BE SO BIG AROUND. ODDLY ENOUGH, YOU CAN PUT THE FRONT AXLE ASSEMBLY FROM AN 87 TROOPER IN AN 88 AND GAIN ABOUT 2 INCHES OF, CLEARANCE AROUND THE OIL PAN. THE DIFF, BECAUSE IT IS AN 8 BOLT CIRCLE, SAME RATIO, SAME WIDTH WITH THE SAME SIZE BRAKES.


comparison image:

rear on the left - front on the right-

[Independent4x]

notice the differences in casting:

front on the left - rear on the right..................note the thinner ring gear.


these units are not interchangable front to rear application:

[Uzi]

That is sweet guys keep it coming maybe the mods could give us a little help and keep this thread up at the top where everyone can see it. I will thow in a little in here....my 1987 had the 10/10 combo and my owners manual shows there was also a diesel that year beacuse it has all the alternate instructions beside the stuff for my gas motor (i've never seen one though). I have also never seen a manual that didn't have Auto hubs (yes I will also confirm that they suck) or opposite for the Auto trans with manual hubs. I also believe 88 was the first year for the auto like Paul said. This probably well known stuff (just going for basics)but the 12 bolt is very strong = to Dana 44 or better, the front end is Ok???? for moderately sized tires...tierods and cv shafts being the weak points. Auburn Limited slip, ARB, and the discontinued Lock Rite for traction in the front end. ARB and/or welder for the 12 bolt rear. Thats all I have for now. Keep up the good work.

[paulevans76]

how about wheelbase? 1st gen 2dr lwb and 4 door are both 104" (IIRC) cant remember what the rs is, 90 or 95"?

1st gen 12 bolt WMS to WMS is 58"

need some leaf spring dimensions

width?
eye to eye?
front eye to centerpin?

I'll be able to throw more numbers out when i pick mine up this/next weekend.

[Uzi]

Yeah...
Sorry finally got around to getting those measurements for the rear springs.
Something like this for a completely unloaded stock spring, no add-a-leaves.

44 in. eye to eye
2.25 in wide
4 leaves including the overload spring
I also measured for center pin to eye on boths sides got 25 in. on one side and 21.5 on the other which adds up to 46.5 so about 2.5 inches of lift probably less than that when they have weight on them. Thats all I have for now correct me if you think or have seen different.

PIC:

[Uzi]

One other thing maybe we could get some more info about the transmission and transfercases ratios and such I know all the ratios are in the factory manual but i can't find mine at the moment.

[Grampa]

my stock rear troop leaves are 47" eye to eye actual steel length, 2.5" wide. spring side to side is 40 1/4" pin to pin.


Rodeos came with the 3.1l GM motor in 91 and also ran a GM 10blt rear axle, came with a 4:30 ratio.


Amigo's werent sold in Canada

VX's werent sold in Canada.

Thats all I know because I'm from Canada

[Uzi]

I just tore my old 10 bolt apart. Thought I would throw out a little info on it for the guys that have older first gens. (81-87)
The shafts are 1.50 in. diameter and then neck down to 1.10 in at the splines and there are 17 of em'.

I don't know how strong these axles are I ran 32's on it for about 6 months open diff. so thats pry not a very good indicator. If someone has run this axle welded or locked otherwise post up tell us what it can handle before you need to upgrade so that guys going low budget can get an idea for tire sizes. I know that there might not be many guys out there running these but tryin to help those that are.

[paulevans76]

well I'm gonna weld mine and try to get a set of 33's on her. I'll let yall know what it can take behind my monster 2.3

[paulevans76]

Here's some info for the OG troopers (from 86 model owner's manual)

Curb weight (vehicle w/ fuel and coolant)

::Gas DLX/LS:: | :: Diesel DLX/LS::

Front ::1676/1673:: | ::1849/1846::
Rear ::1570/1586:: | ::1590/1606::
Total ::3246/3259:: | ::3439/3452::

Technical Data

ENGINE: 4ZD1/C223T

Displacement - 2.254 liters/2.238 liters

Compression - 8.3/21.0

Firing Order - 1-3-4-2/1-3-4-2

Ignition Timing BTDC - 6*/800 / --

Injection Timing BTDC - -- / 10*

Spark plug gap - .04 in./ --

Oil capacity - 4.2 liters/5.7 liters

Coolant Capacity- 8.0 liters/10.6 liters

Mechanical (cable) Clutch

Size - 215 mm (8.46 in.)

Pedal free play - 15 mm (.59 in.)

RATIOS

1st - 3.785
2nd - 2.171
3rd - 1.413
4th - 1.000
5th - 0.855
Rev. - 3.753

Hi - 1:1
Lo - 1.87:1 (sucks!!!!)

Lube capacity - 4.6 liters

AXLES

Front/Rear

Ratio - 4.555:1/4.555:1
Lube capacity - 1.0 liters/1.5 liters

Fuel tank - 21.9 gallons

[RodeoRob]

Matt posted this info and i keep going back to it... so it would probably be useful in this thread....


the isuzu 12 bolt rear is a very underrated axle IMHO
the older ones....like 88-95 are a little narrower, i want to say 56" is what comes to mind....i'll try to get a real measure fore you.

the later ones (96-99) are a couple inches wider (ase the newer troopers got wider)

there is an ARB available for the early and late version.


RD44 - fits the 87-95's w/ 1.32" 26 spline axles

RD85 - fits the 98+ w/ 1.50" 23 spline axles


so early axles:

more common
narrower: 56" +/-
smaller shafts BUT....higher spline count
ring gear roughly sized like a Dana 44
locker: ARB
gears: 4.56, 4.77. 5.38


late ones:

little wider
little bigger brakes
larger shafts, BUT lower spline count
Larger ring gear - roughly like a 60
locker ARB
gears: 4.30's (i think) (5.38's available Internationally)


-Rob

[CPOM]

PAGE

[AirTrooper]

86 and 87 troopers torsion bars are different and shorter and will not interchange with 88+ on Trooper.

86 and 87 rear axles are 2" narrower than 88+ differentials.

The diesel had a unique 5 speed transmission with integrated transfercase and does not interchange with other isuzu engines.

A canadian version of the C223T diesel used the Borg Warner T-18 transmission. found in Pup and canadian S10 models.

The 4jb1-t 2.8L diesel was offered in many countries for many years in the trooper. Only found in USA in off road equipment like Mustang Skid Steers.

Britain and other countries had a 3.1L diesel available.
Currently, a new common rail 3.0L diesel is available elsewhere in the world.

All of these engines are stronger and have more torque than the C223T.
The C223T with pre-2.0 rods, were known to break them too often.
2.0 rods can be identified by the bottom end. virtuallly a solid block of steel, with NO radius around the rod bolts. Basically a solid rectangle. more common 1.5 had some radius of material supporting rod bolts.

The 2.8 engine is reputed to be one of the finest 4 banger diesels ever made.


* Only the C223T diesel option was ever available in the USA. This is a 2.2L turbocharged engine.
* Diesel Kiki (Robert Bosch) licensed injection pump.
* Vacuum pump on back of alternator for power brakes.
* Compression ratio 21:1
* 80 hp 127 ft. lb torque.
* No intercooler/aftercooler
* crankshaft endplay max .030"
* Thrust bearings fall out with wear
* 3 different rods used in USA. commonly known as: 1.0 1.5 2.0
* Crank is tuftrided. therefore, factory never made oversize journal bearings.
* Harmonic balancer is two piece. with rubber mid which does shear/break causing timing to be off.

[SS_TECH150]

What the hell does "SOA" mean?

[trooper4life]

Spring Over Axle...

Daniel

[chadburgin]

so how wide is a 12 bolt from early models. i always thought they were 58 inches, is that not right???

[paulevans76]

yeah should be 58 inches

[douchebagkangaroo]

how wide is the "widetrack" 12 bolt found in troops post 95

[RufusTheRam]

~63" i believe

[DogMeat]

Originally Posted by TrooperLX

as far as i'm concerned manual hubs only came with the automatic transmissions and the manual transmissions only came with the auto hubs, which sounds very dumb and sucks for those trooper owners (including myself) who have a manual transmission. autos suck!!! change to manual hubs... NOW!!! Oh, and the manual transmissions crawl ratio in 4lo is 37:1.

-if you are wondering if you have the 4.77's, the option code is "SL2" which would be found underneath the hood.

Hmmmm....the '90 pup i rescued from my neighbor's backyard has manual hubs and manual trans.
I don't see "SL2" on the option plate but the wheels look like 'snowflakes' to me. Anybody have pictures?

[Rude_Dog]

Originally Posted by TrooperLX

...as far as i'm concerned manual hubs only came with the automatic transmissions and the manual transmissions only came with the auto hubs, which sounds very dumb and sucks...

Contrary to your declaration, my '90 Trooper came w/ auto trans + auto hubs, which, at 180K miles still work fine for my uses. YMMV, etc.

[hobbsm]

can sombody hellp me i am doing a sas on my 86 trooper and wount to know is waganeer stock gears 4.56's and does tera low make crawling gear for a 86 thanks for yall help i am new to the trooper stoff