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Old 01-22-2020, 12:17 PM #1
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Exclamation 2004 V6 sport 4wd differential questions. Which model Detroit truetrac to get?

Okay so I have a 2004 4wd v6 sport.

I've decided I want to put truetracs in the front and rear. But I'm having trouble narrowing down which model# is the correct fit for the front and rear?

From what I've determined to far. The 2004 v6 has as 3.91 gear ratio in the front and rear.
But I'm reading conflicting information on other things.

Some sites say 7.5" and 27 spline for the front some says 8" 30 spline.

For the rear some say it's 8.2" 30 spline a some say 8" 30 spline.

?
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Old 01-22-2020, 12:19 PM #2
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Quote:
Originally Posted by V85VV View Post
Okay so I have a 2004 4wd v6 sport.

I've decided I want to put truetracs in the front and rear. But I'm having trouble narrowing down which model# is the correct fit for the front and rear?

From what I've determined to far. The 2004 v6 has as 3.91 gear ratio in the front and rear.
But I'm reading conflicting information on other things.

Some sites say 7.5" and 27 spline for the front some says 8" 30 spline.

For the rear some say it's 8.2" 30 spline a some say 8" 30 spline.

?
Front and rear for our trucks are all nominal 8".
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Old 01-22-2020, 02:03 PM #3
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Quote:
Originally Posted by Inv4drZm View Post
Front and rear for our trucks are all nominal 8".
Cool that solves that question. Still not entirely sure which model # truetrac for the front and rear. Anyone know?
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Old 01-22-2020, 05:43 PM #4
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I bought the 913A610 8" 4 pinion 30 spline for the rear. I have not installed it yet.

Can you use it in the front with an ADD differential?
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Last edited by LT1coupe; 01-23-2020 at 06:48 AM.
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Old 01-23-2020, 02:42 AM #5
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Quote:
Originally Posted by LT1coupe View Post
I bought the 913A619 8" 4 pinion 30 spline for the rear. I have not installed it yet.

Can you use it in the front with an ADD differential?
I'm reading conflicting info. Some said model:
913A610 for front and rear.

Some said 913A541 in the rear and 911A445 for the front.

And now you're saying 913A619.. so I'm pretty lost. Was hoping someone on here had a definitive answer?

I don't want to buy the wrong ones and find out half way into installing it.
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Old 01-23-2020, 06:49 AM #6
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My apologies, I fat fungered it. it is the 610
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Old 01-23-2020, 11:50 AM #7
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Quote:
Originally Posted by LT1coupe View Post
My apologies, I fat fungered it. it is the 610
Update when you install please.

Any here who can confirm the correct model or suggest a resource to figure it out?
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Old 01-23-2020, 11:57 AM #8
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Talk with East Coast Gear Supply or Just Differentials. They can probably give you part #s and they can sell you the gears already setup to install in your truck.

Ask them if they recommend an automatic locker for the front. I bet not.
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Old 01-23-2020, 12:05 PM #9
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If you search "truetrac" in this forum by title you'll find a few that have installed the 610 & you'll also find at least one that didn't like the truetrac in the front.
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Old 01-23-2020, 09:59 PM #10
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Decided to install mine this evening, got the third member on the table and found this


Dropbox - 20200123_172543 (2).jpg - Simplify your life

This thing ran smooth as silk, no idea it was missing a tooth.

Anyway, the 610 carrier is correct for my 2006 V8 Sport. I'm picking up another third member tomorrow and will install it in that one for an outing Saturday.
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Old 01-25-2020, 06:04 PM #11
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I picked up another third member & the Truetrac is installed. The 913A610 is the correct one for our 4runners. I have not driven it yet because the 3rd member I picked up was from a 4wd & uses bolts on the pinion flange & mine was originally a 2wd & had studs. Guess who doesn't have the bolts?
I know I could swap the flange, but I decided not to jack with the pinion nut.
The bolts will be here next week.
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Old 02-04-2020, 04:46 AM #12
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Quote:
Originally Posted by Inv4drZm View Post
Talk with East Coast Gear Supply or Just Differentials. They can probably give you part #s and they can sell you the gears already setup to install in your truck.

Ask them if they recommend an automatic locker for the front. I bet not.
According to both of them their is no truetrac model that fits the front. Only option is ARB.

I'm familiar with how it will operate off/on road I've driven different vehicles with similar setups.

Quote:
Originally Posted by LT1coupe View Post
If you search "truetrac" in this forum by title you'll find a few that have installed the 610 & you'll also find at least one that didn't like the truetrac in the front.
The 610 is indeed correct for the rear I installed it and it works well. I searched and cannot find anyone who installed a tructrac in the front on a 4th gen. Can you advise who it was who did this?

Has anyone here installed a truetrac or LSD in the front on a 4th gen?
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