Isuzu OEM 5.12:1 Ring & Pinioin Gears....

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04/06/2010, 10:29 AM
BigMeatVX

UPDATE!!!Isuzu OEM 5.12:1 Ring & Pinioin Gears....

Thats right 5.12s....:yes:

Years ago, I was able to source Isuzu part #s for FRONT and REAR ring and pinion gears in the 5.12:1 ratio...:p for the isuzu 10 bolt and 12 bolt.

Also I was able to confirm that the ring gear dia. were the same as our VXs.

Unfortunaltly, I cant seem to find the part numers, somehow I misplaced them:upsetwgra

Recently, Ive done a bit of searching with no results...

Here is the deal...If I remeber correctly, they were produced on the Phillipean and Thialand models (possibly others)...Availble in a diesel powered pick-up....around the 1997-2001 era...

If anyone here has an outlet in Thailand, or if there is a member on here from the area, please chime in...:smilegray
there are alot of Isuzu owners that would be interested in these...
04/06/2010, 01:13 PM
Triathlete

BM...might post this over on the "Planet". I know there are a few Philipino members there. Also keep us posted on what you find...espescially the rears.:yeso:
04/07/2010, 09:28 AM
LittleBeast

Yes please keep us posted I like my 4.77's but that sounds even better when I go from 33's to 35's :)
04/07/2010, 02:39 PM
JoFotoz

And if you do....

Quote:

Originally Posted by LittleBeast

Yes please keep us posted I like my 4.77's but that sounds even better when I go from 33's to 35's :)

...dibs on your 4:77's!!!

jo
07/13/2010, 12:00 AM
BigMeatVX

I received a front set of 5.12 ring and pinion gears today!!!! from Thailand...

Cost is very acceptable...$175...and they are readily available:smilewink
The rear 12 bolt will be coming soon....

Oh and Im selling them....:smilewink

Figure 2-4 weeks for delivery....
07/13/2010, 12:35 AM
Ldub

Quote:

Originally Posted by BigMeatVX

I received a front set of 5.12 ring and pinion gears today!!!! from Thailand...

Cost is very acceptable...$175...and they are readily available:smilewink
The rear 12 bolt will be coming soon....

Oh and Im selling them....:smilewink

Figure 2-4 weeks for delivery....

http://aniszczyk.org/wp-content/uplo...farnsworth.jpg
07/13/2010, 01:49 AM
BigMeatVX

Dub...did you get your 4.77s installed yet?:p
07/13/2010, 02:02 AM
Ldub

Quote:

Originally Posted by BigMeatVX

Dub...did you get your 4.77s installed yet?:p

Not yet, but very soon...:_wrench:...:yesgray:
07/13/2010, 07:04 AM
BigSwede

Playing with my calculator, looks like those 5.12s would be good for very close to stock drive ratio with 35" tires if your stock gears are 4.30.
07/13/2010, 08:48 AM
BigMeatVX

Quote:

Originally Posted by BigSwede

Playing with my calculator, looks like those 5.12s would be good for very close to stock drive ratio with 35" tires if your stock gears are 4.30.

Correct, however I should feel the change even more, since I also am now running a manual tranny...
07/13/2010, 09:46 AM
ZubrAZ

could anybody supply with the link on theoretical side of the gears/pinions. those 4.7 and 5.12 numbers dont make a lot of sense to me, but I would like to know more about physics in this issue. thanks in advance
07/13/2010, 09:58 AM
Ldub

Quote:

Originally Posted by ZubrAZ

could anybody supply with the link on theoretical side of the gears/pinions. those 4.7 and 5.12 numbers dont make a lot of sense to me, but I would like to know more about physics in this issue. thanks in advance

Dood...:rolleyesg

http://lmgtfy.com/?q=explain+gear+ratios :laughing:...:laughing:...:laughing:

http://www.dodgetalk.com/forums/showthread.php?t=154941
07/13/2010, 10:29 AM
vt_maverick

That's awesome Dub! Can't wait to use that on some of the dumb questions I get at work. ;)
07/13/2010, 10:56 AM
Ldub

Quote:

Originally Posted by vt_maverick

That's awesome Dub! Can't wait to use that on some of the dumb questions I get at work. ;)

L0L...one of my co-workers nailed me with it...too good to not use...:laughing:

Sorry Zubraz...consider yourself "the chosen"...:yesgray:
07/13/2010, 10:57 AM
ZubrAZ

hey, i do know how to use google and search. at certain instances, it seems to be easier to ask the question on forum instead of browsing through the first pages of search results, considering the fact that some of the members keep their "finds" organized (like VX Kat) and can access them fast or can read quicker than I do and find the best description using less time.
07/13/2010, 10:59 AM
ZubrAZ

^^^ but I liked the link too (http://lmgtfy.com/?q=explain+gear+ratios) ;)
07/13/2010, 11:39 AM
BigSwede

The short answer is those numbers represent the number of times the driveshaft will turn relative to one turn of the axle and wheel, due to the reduction gearing in the differential.

Putting a numerically larger gear ratio in the differential compensates for putting larger tires on the vehicle, because the larger tires effectively lower the final drive ratio. A simple percentage calculation is all that is needed to find your desired gearing.

In this case:

Desired 35" tires minus stock 29.5" size = 5.5

5.5 divided by stock 29.5" size = .186, or an 18.6% difference in tire size from stock.

Now for the gearing:

5.12 gears minus stock 4.30 = 0.82

0.82 divided by stock 4.3 = 0.19, or a 19% difference from stock gearing to the 5.12 size.

So the 5.12 gears with 35" tires are very close to the same drive ratio as stock 4.30 gears and 29.5" tires. Meaning that your vehicle's git-up-and-go will be about the same.
08/26/2010, 02:43 PM
BigMeatVX

Received my REAR 5.12 gears the other day...for the isuzu 12 bolt ...

However, These gears are 244mm and are made to fit the Trooper 12bolt.
To use them in a VX you will need the axle shafts and 3rd member out of a 98+ Trooper...
It seems isuzu discontinued the smaller 12 bolt (VX style) and all the later ones are the bigger stronger "modified" 12 bolt....the axle shafts are Dana 60 sized and the ring gear is larger also....ARB is availble with these.

I will be installing them very soon...
08/26/2010, 04:29 PM
RamAirZ

Are you positive the shafts just swap over? I would think at LEAST you would need the new bearings for the axle too since the axle shafts are larger. I think it might be easiest to just swap the whole axle. I've debated doing this with the VX because of the Dana 60 similarities. Any word on the front ring and pinion?
08/26/2010, 06:17 PM
Ldub

Quote:

Originally Posted by Ldub

Not yet, but very soon...:_wrench:...:yesgray:

OK, as we all know, things change...:rolleyesg
What with uncooperative weather, heat/humidity induced laziness, & moving, I'll consider myself lucky to get the geerz/locker in before Moab in May...:(

Quote:

Originally Posted by RamAirZ

Any word on the front ring and pinion?

http://www.vehicross.info/forums/sho...24&postcount=5
08/26/2010, 06:53 PM
LittleBeast

Quote:

Originally Posted by RamAirZ

Are you positive the shafts just swap over? I would think at LEAST you would need the new bearings for the axle too since the axle shafts are larger. I think it might be easiest to just swap the whole axle. I've debated doing this with the VX because of the Dana 60 similarities. Any word on the front ring and pinion?

My thoughts exactly.....
08/26/2010, 06:57 PM
RamAirZ

Quote:

Originally Posted by Ldub

OK, as we all know, things change...:rolleyesg
What with uncooperative weather, heat/humidity induced laziness, & moving, I'll consider myself lucky to get the geerz/locker in before Moab in May...:(

http://www.vehicross.info/forums/sho...24&postcount=5

He said something in a PM to me before about getting the wrong ones when they sent them so that's why I was asking
08/27/2010, 07:56 AM
RamAirZ

Got this from Jerry over on Planet:

Quote:

Originally Posted by JLEMOND

AXLE BEARIGNS ARE THE SAME , AXLES ARE LARGER SLIGHTLY FROM THE RETAINER AREA ALL THE WAY TO THE SPLINE END , BUT THE OUT BOARD SEALS AND THE AXLE BEARINGS A RE ALL THE SAME FOR THE 12 BOLT AXLE

Very interesting.
08/27/2010, 01:54 PM
VX1032

BTW, if I rememeber correctly, ARB discontinued the locker for 98+ all that is left is the stock on the shelves.
09/10/2010, 11:00 PM
BigMeatVX

Hmmm...then Id better hurry up and get one...LOL