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

[BigMeatVX]

Thats right 5.12s....

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

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...
there are alot of Isuzu owners that would be interested in these...

[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.

[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

[JoFotoz]

And if you do....

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

[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
The rear 12 bolt will be coming soon....

Oh and Im selling them....

Figure 2-4 weeks for delivery....

[Ldub]

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
The rear 12 bolt will be coming soon....

Oh and Im selling them....

Figure 2-4 weeks for delivery....

[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.

[BigMeatVX]

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...

[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

[Ldub]

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...

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



http://www.dodgetalk.com/forums/showthread.php?t=154941

[vt_maverick]

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

[Ldub]

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...

Sorry Zubraz...consider yourself "the chosen"...

[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.

[ZubrAZ]

^^^ but I liked the link too (http://lmgtfy.com/?q=explain+gear+ratios)

[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.