LSD

[Paaji]

Geeves is spot on with the turning behaviour - should have mentioned that myself. Can be a bit skippy when turning on wet roads. Also makes it quite fun, if a little hairy.

J

[JustinW]

Well Alan was right, changing diff heads does involve bystanders learning lots of new swear words, but not for the reason he mentioned. Got the diff out on Saturday and found it was 4.3, not a 4.55 like I thought. After counting the teeth about ten times we put the old diffhead back in and decided we need a 4.55 front diffhead to put in as well as I'm running 33" tyres.

Lessons learnt:
1. Check the diff ratio by jacking up and counting before you buy a new one or take it out (note there was no ratio code on the plate);
2. Don't listen to so called experts, ie dealer mechanics that tell you "yeah those all have 4.55s in them"

So if you have a 4.55 front diff head for sale let me know

[JustinW]

The saga continues. My Wizard now has 4.55 diffs front and back, with the back being a LSD. The rear diff was easy as I had practised on it last month. It took about and hour and a half. At the same time I removed the rear sway bar as I'd broken a swaybar link again.

The front diff is an entirely different story. What a @#%*! of a job. It took two of us about six hours! The steps are listed below, hopefully this will put off anyone else from having the same idea as me.
1. remove wheels and place axle stands under chassis
2. remove calipers
3. remove hub assemblies (the left side we had to totally disassemble to replace the CV boots)
4. pull the half shafts out of the axle assembly
5. remove the suspension cross member
6. disconnect eletrical and vaccuum connections to freewheel actuator
7. unbolt sway bar links from bottom control arms
8. remove steering idler arm
9. undo bolts holding axle assembly in (3/4" drive socket set an advantage)
10. manouvre axle housing to ground without damaging it or yourself
11. dismantle freewheel actuator and remove
12. remove mounting brackets and pull axles out
13. unbolt diff head and remove
14. install new diff head and bolt up
15. reassemble every thing making sure you remember where everything goes and have no parts left over
16. fill diff with oil
17. don't run the halogen work light over with the 3 ton floor jack
18. test drive
19. put 4.3 front and rear diff heads on Trademe

This was a much bigger job than my mate and I expected.

This job goes better with the following
1. a good mate with an understanding wife
2. 3/4 drive socket set
3. rattle gun
4. a sense of humor

I haven't had a decent play with it yet. Took it for a run last night with the GPS going and was suprised to find with the 33" tyres and lowered diff ratio the speedo reads near enough to exactly right.

Thanks to Harry for supplying the front diff head and lending me his Haines Manual

[geeves]

Sounds like a job well done.
Understanding wives are sometimes better as helpfull wifes although they can get squeamish about holding oil soaked rags.

[Harry]

Justin, I meant to suggest that you put some spacers between the diff and it's mounts to lower it a little and at the same time space the ball joints down to get some downwards travel back after screwing the torsion bars up.Did you mean to ring me yesterday afternoon or did you get a wrong number?
Regards,Harry.

[JustinW]

Well used the LSD in anger for the first time last weekend at Motu. Works a treat. I could climb things I never could before. It was great later in the week at Kiwi Challenge where, due to the rain, you needed 4L on the main access track! (Damn, I hate going back to work after a whole week off!) Definately need to be careful in the wet though, managed to turn it 90 deg at an intersection in Hamilton in the rain on Sunday. (Harry, yes i did mean to ring, but can't remember what for)

[Harry]

So you're unhappy about going back to work after a week, Justin.I'm starting a new job tomorrow and I've been off for a year.It's been a mad scramble to get 2 Bighorn boddies stripped, cut up and off to the scrappy in Hamilton while I still had time.
Regards,Harry.

[geeves]

good luck in the new job

[Harry]

Thanks,Alan.Selling fasteners is a whole new ballgame for me .
Regards,Harry.

[geeves]

I trust that is industrial fastners ie the used ones in boxes in your garage with spirals at one end and hexagons at the other.

[Harry]

That's one of them.If it fastens then we probably sell it,Including truck tiedowns and cable ties.Buit nothing vehicle specific.It's been quite interesting so far.
Regards,Harry.

[Harry]

Alan, remember those 16 mm nuts you needed for your winch.It occurred to me that your winch being American it would have had 7/16" bolts and nuts, which have 5/8" nuts, near as dammit to 16 mm.And my Chinese copy would be the same.The mounting pattern is 10" x 41/2" which doesn't match up with anything sensible in metric.
Regards,Harry.

[dpswan]

Any one heard of the older 2.6 trooper lsd diffs fitting into the front diff of a ubs55 bighorn read it on some thing i googled........they said the front diff of the ubs55 is a17 spline and origanally the ubs25/trooper rear diff.

[geeves]

It apears this is true although Ive never checked it myself. If you can get an early rear lsd in good nic at a good price give it a go. Do double check your ratios though as most early diffs are 4.56 and a lot of the ubs55 bighorns were 4.3.
If you cant find one at a good price auto lockers for the front diff you already have are about 700 new

[v5555]

I'm trying to find out which rear diff a 4x4 2000 Isuzu TFS pick up with the 2.8td engine carries.194mm or 220mm?10 bolt or 12 bolt?

[dxmedia]

This might help...


WHAT AXLES DO I HAVE IN MY TRUCK?
ISUZU AXLE INFORMATION LIST

TROOPER

STOCK RATIO: 4.56:1 EXCEPT W/ WIDE TIRE OPTION 4.77:1

1985-86 4WD 2.3L 4CYL
FRONT: ISUZU IFS 8 BOLT (SOMETIMES REFERED TO AS 9 BOLT)
REAR: ISUZU 10 BOLT (3RD MEMBER, DRUM BRAKE)

1987 4WD 2.3L 4CYL
FRONT: ISUZU IFS 8 BOLT (OR)
ISUZU IFS 10 BOLT
REAR: ISUZU 10 BOLT (3RD MEMBER, DRUM BRAKE)
(NOTE: SOME SPLIT YEAR -SOME END OF YEAR MODELS HAD 12 BOLTS)

1988-91 4WD GM 2.8L V-6, 2.6L 4 CYL
FRONT: ISUZU IFS 10 BOLT
REAR: ISUZU 12 BOLT (3RD MEMBER, DISK BRAKE)

1992-97 4WD 3.2L 6 CYL
FRONT: ISUZU IFS 10 BOLT
REAR: ISUZU 12 BOLT (3RD MEMBER, DISK BRAKE)

98-2002 4WD 3.5L 6 CYL
FRONT: MODIFIED ISUZU IFS 10 BOLT
REAR: MODIFIED ISUZU 12 BOLT – LARGER OVERALL, DANA RING
GEAR ALMOST IDENTICAL TO D60 (3RD MEMBER, DISK BRAKE)


AMIGO

1989-1994 2.6L 4 CYL

FRONT: ISUZU IFS 10 BOLT
REAR: ISUZU 12 BOLT (3RD MEMBER, DISK BRAKE) (4WD & 2WD XS)
REAR: 2WD NON XS MODEL – ISUZU 10 BOLT

PICK UPS

1988+
FRONT: ISUZU IFS 10 BOLT
REAR: ISUZU 12 BOLT (3RD MEMBER, DISK BRAKE)

RODEO

1991-92 GM 3.1L V-6, 1993-94 4 CYL.

FRONT: ISUZU IFS 10 BOLT
REAR: GM 10 BOLT (DRUM BRAKE)



RODEO/ HONDA PASSPORT

1993-4 V-6, 1995-97

FRONT: ISUZU IFS 10 BOLT
REAR: DANA 44 (DISK BREAK, USES 4.10 RING GEAR ON 3.92 DOWN
SMALL CARRIER – THICKER THAN STANDARD RING GEAR)


1998-2001 3.2L 6 CYL

FRONT: ISUZU MODIFIED IFS 10 BOLT ( LIKE TROOPER)
REAR: DANA 44 ( SLIGHTLY MODIFIED, FINNED COVER 4.10 STOCK)

Isuzu Corp 8-bolt (front)
model year(s) 81-87 Pickups and Troopers
(87 being transition year to 10-bolt)
Some Pickups up to 95

configuration IFS
axle shaft diameter
spline count
ring gear 7.5"?
pinion
factory gear ratios
factory differentials
notes used a weaker hub design (fewer splines) than its replacement, the 10-bolt.



Isuzu Corp 10-bolt (front)
model year(s) 88+ Trooper, Rodeo, Amigo, Vehicross, Axiom
configuration IFS
axle shaft diameter
spline count 17-spline
ring gear 7.62"?
Reverse cut
Thinner ring gear than 10-bolt rear

pinion Shares same pinion bearings with 10-bolt rear
factory gear ratios 4.10 - Rodeo
4.30 - Rodeo
4.56 - Trooper
4.77 - '89 Trooper RS, '90 and '98 4x4 Amigo w/ 2.2L
aftermarket gear ratios 5.38 - Tera
factory differentials Shares same carrier and carrier bearings with 10-bolt rear

aftermarket differentials Auburn LSD
Aussie Locker - limited, exclusive with Independent4x.com
PowerTrax LockRight (from 10-bolt rear application) - discontinued
ARB (RD94) *see notes below

notes Variation exists for first half of ‘98
The 10 bolt from 1/98- 5/98 is non standard in design (DANA) and can not be used with an ARB locker, models produced from 6/98 on also had 4.77's an are the standard garden variety that will take an air locker - Swordy
The VehiCROSS' front suspension is the 1998+ Trooper's - Smiley




Isuzu Corp 10-bolt (rear)
model year(s) 81-87 Pickups and Troopers (87 being transition year to 10-bolt)
some Pickups up to 95
88-95 2wd regular cab Pup
Pickups with 2.3L and VIN starting JAA
93 2wd Amigo

width 2” narrower than '88 12-bolt rear

configuration leaf - common
coil - rear drive turbo Impulse

axle tube diameter
axle tube thickness
axle shaft diameter 1.50” shafts, neck down to 1.1” at splines
spline count 17-spline
ring gear Standard cut gears
Thicker ring gear than 10-bolt front

pinion shares same pinion bearings as 10-bolt front
brakes Drum

factory gear ratios 3.90 - Impulse
4.10 - 86-87 Turbo Diesel, 2wd regular cab Pup
4.56 - 2.3L
aftermarket gear ratios none
factory differentials open - common
LSD from rear drive turbo Impulse, could be used in 10-bolt front
shares same carrier and carrier bearings as 10-bolt front

aftermarket differentials PowerTrax LockRight - discontinued
notes 3rd member's are not interchangeable with 10-bolt front.
The LockRight #3111 had spacer blocks to go between the ends of the axles and the cross shaft. #3110 is identical, but without the spacer blocks. This locker was orginally designed for rear application, but was found to also work in the front.



Isuzu Corp 12-bolt (rear)
1st generation 2nd generation 3rd generation
model year(s) 89-94 4wd Amigo
88-91 Troopers
88-95 2wd Spacecab Pup
All 2.6L Pickups 92-97 Trooper
??-?? VX
98+ Trooper
width 58” wms to wms
(some reports of 56")
61” or 63” wms to wms
(w/ fender flares = 63") 63" wms to wms
configuration leaf coil coil
axle tube diameter 3" 3.5"
axle tube thickness
axle shaft diameter 1.32" 1.50"
spline count 26-spline 23-spline
ring gear 8.66"
(comparable to 8.5" diameter Dana44, but aprox 1/2" thicker) 9.61" Spicer-produced
(comparable to 9.75" diameter Dana60)
pinion pinion shaft larger in comparison over Dana44
brakes disc

disc - larger than 1st gen
integrated drum e-brake
disc
ABS rear ABS only - tone ring pressed onto the carrier
-or-
4 wheel ABS - sensors at the tubes
4 wheel ABS - sensors at the tubes
factory gear ratios 4.56 - common
4.77 - rare. found in '89 Trooper RS and select models with "SL2" option code. (wide tire package + snowflake wheels)
4.10 - 88-89 2wd Pickup ('GT5'), Amigo (aluminum wheels)
4.30 - Pickup ('S7C'), Amigo (steel wheels)
4.30, 4.56
aftermarket gear ratios 5.38 - Tera 5.38 - Iceland
factory differentials open, clutch-plate LSD open, clutch-plate LSD (std.)
aftermarket differentials ARB (RD44) ARB (RD85)
notes Sept 97 - 98: unidentified changes that prevent installation of ARB.
94 Amigo - 1st gen axle that used 2nd brakes
The VehiCROSS' REAR is from the earlier 1996-97 Trooper - Smiley


Isuzu/Dana Model 44 (rear)
1st generation 2nd generation
model year(s) 93-97 Rodeo
(with the 3.2L Isuzu engine) 98+ Rodeo, Amigo, Rodeo Sport
width 59.75 wms to wms 63” wms to wms

configuration leaf coil
axle tube diameter
axle tube thickness
axle shaft diameter
spline count 30-spline 30-spline
ring gear standard THICK D44 ring gear
pinion standard D44 pinion Larger diameter pinion shaft requiring a different ID on the pinion bearing... or a different bearing.
brakes 6cyl - disc
4cyl - drum
4x4 - disc
4x2 - drum

ABS Single ABS sensor on pumpkin or two in the tubes. ABS tone ring on carrier

factory gear ratios 4.10 - 15" standard wheels
4.30 - 16" optional wheels
4.56 - 4cyl
4x2 : 3.73 (98-99), 4.10, 4.30, 4.56, 4.78
4x4 : 4.10 (98-03), 4.30

aftermarket gear ratios any commonly available D44 ratio
factory differentials THICK ring gear on a LOW (3.73-) carrier
G80 option code - LSD 98 (possibly 99) LSD was optional. 00+ all had mandatory LSD. G80 option code does not apply to 2nd gen.


aftermarket differentials LockRight 2410 - open carrier No-Slip - Tracloc carrier
notes A few have reported needing to use one of the OEM pinion bearings to set up the pinion due to the ID of the housing finned aluminum diff cover.
Without some "juggling" of bearings or machine work, the 98+ gears would not "drop" right into the 93-97 housing, or any other D44 housing using standard gears.


GM Corp 10-bolt (rear)
not to be confused with the Isuzu Corp 10-bolt

model year(s) 91-93 Rodeo V6 (must be coupled with 3.1L GM engine)
Early US built Pickups with 2.3L and VIN starting 4S1 or 4SA

width
configuration leaf
axle tube diameter
axle tube thickness
axle shaft diameter
spline count 28-spline?
ring gear
pinion
brakes drum
factory gear ratios 4.30
4.56

aftermarket gear ratios
factory differentials open, LSD
aftermarket differentials
notes GM 10-bolt is a c-clip style axle... often undesirablable next to flange retained style such as Dana44

93-95:
drum brakes (4 cyl), 4.56 ratio (41/9 teeth, HC6)
drum brakes (4 cyl), 4.10 ratio (41/10 teeth, GT5)
drum brakes (4 cyl), 4.30 ratio (43/10 teeth, S7C)
disc brakes (6 cyl), 4.10 ratio (41/10 teeth, GT5)
disc brakes (6 cyl), 4.30 ratio (43/10 teeth, S7C)

96-97:
drum brakes (4 cyl), (4.56 ratio, 41/9 teeth, HC6)
disc brakes (6 cyl), (4.30 ratio, 43/10 teeth, S7C), 3 sensor ABS (sensor in pumpkin)
disc brakes (6 cyl), (4.30 ratio, 43/10 teeth, S7C), 4 sensor ABS (sensors in axle tubes)

98-99:
4x2 (drum brakes), 4.56 ratio (41/9 teeth, HC6)
4x2 (drum brakes), 3.73 ratio (41/11 teeth, 6NW)
4x2 (drum brakes), 4.10 ratio (41/10 teeth, GT5)
4x2 (drum brakes), 4.78 ratio (43/9 teeth, S2J)
4x2 (drum brakes), 4.30 ratio (43/10 teeth, S7C)
4x4 (disc brakes), 4.10 ratio (41/10 teeth, GT5)
4x4 (disc brakes), 4.30 ratio (43/10 teeth, S7C)

2000:
4x2 (drum brakes), 4.10 ratio (41/10 teeth, GT5)
4x2 (drum brakes), 4.78 ratio (43/9 teeth, S2J)
4x2 (drum brakes), 4.30 ratio (43/10 teeth, S7C)
4x4 (disc brakes), 4.10 ratio (41/10 teeth, GT5)
4x4 (disc brakes), 4.30 ratio (43/10 teeth, S7C)

2001-2003:
(2 Dr Sport & 4 Dr), 4x2 (drum brakes), 4.10 ratio (41/10 teeth, GT5)
(2 Dr Sport & 4 Dr), 4x2 (drum brakes), 4.78 ratio (43/9 teeth, S2J)
(2 Dr Sport & 4 Dr), 4x2 (drum brakes), 4.30 ratio (43/10 teeth, S7C)
(2 Dr Sport & 4 Dr), 4x4 (disc brakes), 4.10 ratio (41/10 teeth, GT5)
(2 Dr Sport & 4 Dr), 4x4 (disc brakes), 4.30 ratio (43/10 teeth, S7C)

2004:
(4 Dr), 4x2 (drum brakes), (4.30 ratio, 43/10 teeth, S7C)
(4 Dr), 4x4 (disc brakes), (4.30 ratio, 43/10 teeth, S7C)

[geeves]

A lot of good info in there but its from a USA site so a couple of things to watch.
Amigo is pretty much a mu.

Rodeo is sold in NZ as either a Wizard or 5 door Frontera.

USA never got the diesel engines the 2.8 and 3.1 engines mentioned are chevy V6s

Dana diffs are rare in Isuzus outside the USA We only get the Isuzu 8,10 and 12 bolt versions. Its a pitty because the range of lockers for Dana diffs is huge

I would love to lay my hands on a 4.77 diff but Ive never seen a reference to them outside USA sites

[dxmedia]

4.77 that was for the US only big wheel option wasn't it?

[geeves]

As far as I can make out yes. The big wheel was still only 31 inch but since they had a petrol engine it make sense

[dxmedia]

for the 4.77 diff on 35" tyres with an over fueled and over boosted 3.1 on a 3" straight through

NOW that would be nice