I swapped rear axle in my 95 4x4 3.0 automatic a few months back.I was unsure of the gearing so I asked yotatech how to find out without removing the axles and counting teeth.Today I rotated the rear tire 10 revolutions and got 21 and a third revolutions of the driveshaft and spun the front tire 10 revolutions and got 24 and a half revolutions of the front drive shaft.Im confused on the formula to figure the gearing.Also I wheeled it once for about twenty minutes in soft sand and gravel.I didnt hear any clunking or grinding or other telltale signs of damage.What are the chances I damaged my transfer case?

 

Count how many tire revolutions it takes to rotate the driveshaft 1
revolution.

This is backwards - ignore it, I had a brain cramp.

 

Well Im getting a little more than 2 revolutions of the driveshaft for every tire revolution.I know theyre not the same as stated above.Front tire 10 revolutions to front driveshaft 24 and a half revolutions.Rear tire 10 revolutions to rear driveshaft 21 and a third revolutions.I need to know the gearing so I can pick one or the other to find a match.Also wondering if I damaged the transfer case from the one wheeling episode.I have another transfer case on an extra standard tranny I have,would that bolt up to my automatic tranny if I did damage it?

 

You rotate the tire once around, and count the number of driveshaft revolutions.

 

Hammockman is right, you just rotate the tire once and count the driveshaft's,
if you have 4.10 gears the driveshaft will rotate 4 and a tad revolutions

(that's what the gears mean 4.10:1, 4.10 revolutions of the driveshaft to one revolution of the wheels)

maybe mark the driveshaft flange and the carrier with chalck to get a more accurate read

and the front and rear should be identical

 

personally i would rather take 45-60 minutes and pull a third to confirm gears...take the subjectivity out of the equation..

 

On an open diff, with one tire on the stopped and one tire free, don't you have to make the tire go around twice to get an accurate count? There are some videos on the Tube to verify this.

So, if that's the case, and your revolution count is accurate, you have 4.1 turns of the driveshaft for two revolutions of the tire. I would venture to say you have 4.10s. But I don't know how much "a little more than 2 revolutions per one revolution of the tire" is exactly. Possible that you have 4.56s if its 2 & 1/4 revolutions of the driveshaft per one revolution of the tire.

And according to your last count of the front and rear driveshafts, you have 4.56s or 4.88s in the front, and 4.10s in the rear.....

Also, on your door jamb sticker sometimes it will tell you an axle code. There are links (do a search) to deciphering this if you have it.

 

Ok I just watched a youtube video.With my results from yesterday the front axle has 4.88s and the rear axle has 4.30.So now my question would be could I havs damaged my transfer case from 4 wheeling with this setup one time in soft sand gravel for twenty minutes?If so how can I tell?And will the transfer case from a standard transmission fit on an automatic?

 

Hey Dropzone you can pull two axles drop a driveshaft and pull a third in 45 to 60 minutes?Wow your good.

 

hey man , if you look at the codes on the inside of the drivers door it should tell you stock for your truck.
from what i have personally gathered most of the 3.0 auto's came with 4.30 gearing stock

 

On my way back outside to work on her.I'll check door codes.Spent all thanksgiving day under,in and on my yota.Great way to avoid annoying relatives and in laws.Why is being obsessed with my truck a bad thing?Cant understand it.

 

4 bolts, 20 nuts, 2 brake lines and two e-brake pins
12 lug nuts

 

Technically you don't HAVE to pull the 12 lugs....

 

Dropzone,I wasnt trying to be sarcastic by the way.I was being sincere.Your good.It will probably take me two hours.

 

and technically its 8 bolts

But ive never had a problem with count and spin method not being accurate. Especially if you can get a second person to spin the tire 2 exact times with one wheel stopped and one free. While you count the driveline revs. Helps to mark the DL and the housing with something. Pretty hard to mess it up. Not into dismantling anything if I dont need to.

And no you wont destroy your T-case instantly if you have the wrong gearing, its just not good long term. If they were that weak you wouldnt be able to do a burnout without blowing it up.

 

Ok let's see if this come across right, it shouldn't have hurt the tcase because the soft sand give the front tires enough slip that it wouldn't cause binding, correct me if I'm wrong..

 

ThatGuy1295 and 9594runner that makes me feel a little better about not damaging my t-case.I literally wheeled it for like 20 minutes.What about the t-case from the standard tranny, will that in the future be a good backup?

 

No I don't think the tcase will move over cuz the auto uses a hydro to engage the 4 wheel drive and the manual is a lever engagement

 

Ok thanks bro.

 

Either way, but even on dry concrete it wont just break your t-case. Your t-case isnt any weaker then your axles, or drive lines, or transmission. And they dont just snap in 2 when you bark them off by dumping the clutch. Not to mention that even with the same gearing front and rear you still bind when turning, cause the front and rear are moving at different speeds. Unless your running big tires you dont have to worry about that.


Worded strangely but no I dont believe the auto t-case is swappable with the manual t-case. And im not positive on that either. But its worth more to sell it to someone with a manual trans.