3 fins, so I do have a 4cy 3rd on a V6 truck <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

See for yourself:

Diff side

Diff top

And here's my t-case:

T-Case

</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by Adam F:
<strong>3 fins, so I do have a 4cy 3rd on a V6 truck <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

See for yourself:

Diff side

Diff top

And here's my t-case:

T-Case</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Actually, that looks like 4 fins. The top fin counts too. So, it appears that you're diff is a V-6 type 4 pinion type.

The last number in the gear code was originally meant to distinquish between a truck that had LSD or an open diff. LSDs were an option on trucks for overseas markets. A 2 code originally meant open diff. It wasn't until the turbo came out in '86 that Toyota made the stronger V-6 style diff. So, it's possible that all V-6 and turbo diffs for the U.S. market were coded with a 2, signifying an open diff and the 4 code, signifying the larger 4 pinion diff, didn't come about until '89.

Anyone out there with a pre-89 truck have 4 code on a V-6 or turbo truck?

<small>[ September 12, 2002, 07:41 PM: Message edited by: Brian894X4 ]</small>

Adam's looks a lot like my old one from before the E-locker mod.

<img src="http://pics.montypics.com/jx94148/2002-09-12/dscf0004.jpg" alt=" - " />

Here are the guts:

<img src="http://pics.montypics.com/jx94148/2002-09-12/dscf0005-073123.jpg" alt=" - " />

2 pinions.

See the flat "plate" cast right above the pinion input on the diff? That's a V6 carrier. Someone could have put 4cyl gears in though.

Looks like a chain case but the skid plate is in the way. The front drive section can be separated from the reduction unit on a gear driven case. I think the chain case is one piece.

</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by jx94148:
<strong>Adam's looks a lot like my old one from before the E-locker mod.

<img src="http://pics.montypics.com/jx94148/2002-09-12/dscf0004.jpg" alt=" - " />

Here are the guts:

<img src="http://pics.montypics.com/jx94148/2002-09-12/dscf0005-073123.jpg" alt=" - " />

2 pinions.</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Also, count your side fins, though. You'll see three on yours and 4 on Adams. <img border="0" title="" alt="[Wink]" src="images/icons/wink.gif" />

</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by Adam F:
<strong>...
And here's my t-case:

T-Case</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Chain.

Taken/Copied from Marlins web site:

http://www.marlincrawler.com/dual_mc07_intro.html
then click on "How to determine Crawl Ratios."

Here is how to calculate your overall crawl ratio.
It's a simple formula.

Multiply your first gear, times your low range transfer case gear, times your differential gear. For example if you have:
3.93 first gear in your transmission
2.28 low range gear in your transfer case
4.10 gears in your differentials
Your crawl ratio is 3.93 X 2.28 X 4.10 = 37:1

If you have two transfer cases then you also multiply the number by the second case like this:
3.93 first gear in your transmission
2.28 low range gear in your first transfer case
4.70 low range gear in your second transfer case
5.29 gears in your differentials
Your crawl ratio is 3.93 X 2.28 X 4.70 X 2.29 = 223:1

Below is a list of gear ratios in popular Toyota Transmissions and Transfer cases to make it easy for you to figure your exact crawl ratio.

Land Cruiser Transmissions
Type Speeds Years First Gear
J30 3 speed 59 - 9/73 2.75
H41 4 speed 9/73 - 9/90 3.55
H41 Non-US 4 speed 9/73 - 9/90 4.93
H42 4 speed 9/80 - 9/87 3.55

Land Cruiser Transfer Case
2 speed part time case made by Asco
Years Low Range ratio
58 - 63 No low range
64 - 9/73 2.31
9/73 - 4/75 1.99
4/75 - 7/80 1.96
8/80 - 8/87 2.28
9/87+ ? Auto Transmission

Pickup and 4Runner Transmissions
Type Speeds Years First Gear
L43 4 speed 79 - 80 3.67
L45 4 speed 81 - 82 3.93
L50 5 speed 81 - 82 3.93
L52 5 speed 83 3.93
G52 & G54 5 speed 84 - 88 (Carb) 3.93
W56 5 speed 85 - 95 (EFI) 3.95
R151F 5 speed 86 - 87 (turbo only) 4.31
G58 5 speed 89 - 95 3.93
R150F (6 cyl) 5 speed 88+ 3.83

Pickup and 4Runner Transfer Cases
All V6 mini trucks use the chain drive tcase and have a 2.57 low range gear. Most 4 Cylinder mini trucks use a gear drive t/case with a 2.28 low range. However some 4 cyl trucks use the V6 style chain drive case. The best way to find out what type you have is to look under your truck and cound the bolts holding the rear cover in place.

If you have 7 bolts in the rear cover then you have the gear driven unit.
If you have 5 bolts holding the rear cover then you have the chain drive unit.

http://www.marlincrawler.com/java/getratio_tcount.jpg

Gear drive unit with 7 bolts pictured above.
Bolt #7 is behind the drive shaft and can't be seen in this picture.

Curt

How does a 4 pinion work. I don't know much about diffs, but I am really confused with the 4 pinion's.