http://www.downeyoff-road.com/Chassi...ents/index.htm the 8" is 200 bux cheaper than the 7.5 "

 

so in conclusion the best way to determine if you have an 8" diff is to pull both axel shafts and remove the diff and then measure the ring gear diameter. unless you know the vin # but ive found that the info kyle gave is accurate .

 

best way to figure is to count the splines, 8" will have 30, 7.5 will have 27. i think the actual ring gear diameter is like 7.8" on the 8", but i can't remember for certain.

 

yea its just barely under 8" the spline trick actually does work too

 

poops a giggles i found this to be very helpfull.

Differentials – Gearing

Gearing..... with a 4 banger and single case
stock 3.96 or 4.10= 31 or smaller tire
4.88=33 inch tire
5.29= 35 to 38 inch tire.
5.71= NOT RECOMMENDED FOR REAL OFFROAD USE

Originally posted by DSI
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83-older 4.11 diff's are 37/9 and are 8in 4cyl style diff's, in 84 they switched th the 41/10 ratio, any time you have more teeth to a pinion the stronger the diff will be, reason being: more tooth contact/more teeth contacting the ring gear at one time.
This is the same reason 5.71's are very weak, 6 teeth, 5.29's have 7, 4.88's and 4.38's have 8, 4.56's have 9 and 411's have 9, 410's have 10, and 390's have 10
----------------------------------------------------

Originally posted by TNToy
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If you have the axle code of your vehicle, it is easy to find out what size differential, what ratio, and what pinion set-up you have. This will also help if you are hunting for a particular unit off another vehicle. The axle code is in the vehicle ID plate under the hood or drivers door. The axle code is 4 digits: a letter followed by 3 numbers.

Example: F372 = 7.5" 3.58 final ratio 2 pinion
Code:

1ST DIGIT R&P SIZE 2nd/3rd Digit R&P RATIO 4th DIGIT PINION SET-UP A 138mm O1 3.30 2 2 pinion B 145mm O2 3.36 3 2 pinion LSD C 6.25" O3 3.55 4 4 pinion D 6.62" O4 3.56 5 4 pinion LSD E 7.1" O5 3.70 F 7.5" O6 3.89 G 8.0" O7 3.90 H 9.0" O8 4.11 J 9.25" O9 4.22 K 9.5" 10 4.38 L 10.5" 11 4.44 M 12.5" 12 4.63 N 13.5" 13 4.79 P 14" 14 4.88 R 162mm 15 5.13 S 6.38" 16 5.29 T 6.7" 17 5.60 U 6" 18 5.71 V 10.6" 19 5.83 W 15.5" 20 6.17 X 142mm 21 6.67 Y 158mm 22 6.78 23 6.83 24 7.64 25 4.56 26 5.57 27 3.36 28 4.30 29 4.10 30 3.73 31 3.91 32 6.59 33 7.50 34 6.78 35 7.64 36 4.78 37 3.58 38 3.42





Differentials – Info

General Toy diff info including identification with pictures.
http://home.off-road.com/~bibelheime...diff_info.html


Differential picture identification by 4RnrRick

Toyota 2 pinoin 4 cylinder 7 1/2" diff (27 spline) used on 2wd and some celicas
http://tellico.off-road.com/wwwthrea...750_driver.jpg


Toyota 2 pinoin 4 cylinder 8" diff (30 spline)
http://www.4crawler.com/4x4/Images/Diff4Cyl.jpg


Toyota 4 pinoin 6 cylinder 8" diff (30 spline)
http://www.4crawler.com/4x4/Images/Diff6cyl.jpg


Toyota Land cruiser high pinion 8" diff (30 spline)
http://www.4crawler.com/4x4/Images/DiffHP.jpg


Toyota 4 pinion 6 cylinder 8" 3rd from a '96-00? 4Runner (30 spline)
http://www.pirate4x4.com/forum/attac...&postid=436184


Toyota 8.25 or 8.4 diff Taco / T-100 / Tundra (30 spline)
http://tellico.off-road.com/wwwthrea...100_tundra.jpg

 

Damnit! All that tells me is my 98 SR5 has a 7.5" 2 pinion with 4.10's in it...could that be real?

 

you have the 7.5 front and the 8 back, he is talking about an earlier 2wd truck than ours.

 

so what would it be if my code reads B05A? Does that tell me what size 3rd member I have? Its off of a 97 v6 mini taco 5 lug pattern.

 

I know this is resurrecting an old thread but I have a third member that I was given along with a coiled rear end out of a ifs 4runner. I am trying to identify it, it has 3 ribs and casting that indicates it is a 4cylinder 3rd. But it also has 4 pinion carrier with threaded preload adjusters as supposed to shims, which seems to indicate it might be a v-6 3rd? I have read a bunch of information on identifying them but they all seem to contradict the one I'm looking at. Any info helps, thanks...

 

All toy 8" diffs use threaded adjusters. Some later model housings are supposed to have a different casting with different ribbing.

If it's got a 4 pinion carrier, it's certainly a 'v-6 type 3rd

Here's some good info: http://home.4x4wire.com/erik/diffs/

 

I've checked out eriks4x4 and that's where my question stemmed from. Half way down the page on the rear end section he has a picture of the 3 styles side by side and my casting according to that is a 4 cylinder. But if you say the 4 pinion dictates that and not the casting then I guess that picture is incorrect? I appreciate the info,

 

Did you see this on Erics page???

'96-up 4runner V6 diffs:
- new improved housing that looks the same as the T100/Tundra/Tacoma diff on the outside, internals are all the same as the regular V6 diff
- 30 spline pinion on OEM gears, swap pinion flange to 27 spline to use aftermarket gears

 

I did see that, but they have a picture of the t100 housing also that looks nothing like the other two. Not trying to argue, just confused on the different info out there. Here's the link for the picture from eriks4x4 I'm talking about. I have pics of my third member but I don't know how to post it.
http://home.4x4wire.com/erik/diffs/3rds.jpg

 

It is possible that a a V-6 carrier was put into a 4 cyl type housing using 'conversion' bearings.

 

Does anyone happen to know the specs on the different bearings? Maybe I could just measure the race or bearings and figure it out that way...

 

There are two different inner pinion bearing thicknesses for 'long' and 'short' pinion gears and 45mm and 50mm carrier journals. (inside diameter of the carrier bearings)

V-6 carriers have 50mm journals while 4 cyl carriers have 45mm journals.

As far as I know, all toy 8" pinion bearings are the same outside and inside diameter between 4 and 6 cyl types, just different thicknesses between types.

Carrier bearings inside either 45mm, or 50mm. Think outside diameters all the same, but can;t lay hands on some to check right now.

Here's a bunch of bearing info from ZUK:: http://www.gearinstalls.com/bearing.htm