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Unread 01-10-2015, 11:28 AM   #1
870
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True trac

Here is another question I have gotten different answers on. I currently have 3:73 gears can I use the same carrier in a 3:73 and 4:56?
Will I have to drill out the ring bolt holes. If I have to drill out the ring bolt holes wouldn't it harder than the back of my brothers head?

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Unread 01-10-2015, 11:56 AM   #2
jwmbishop
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4.56:1 will fit a d30 with stock carrier with out drilling the holes (limit is 4.88:1 - drilling for a higher numerical is possible BUT: ).

I would never recommend drilling a ring carrier for most applications. Some folks do - but as you already understand it is hardened - hardening is done AFTER the oem holes are drilled and tapped. Hardening effects the surface - so as you drill through - you stress that hardening depth - later you will have spider cracks at the bolt holes at that first thread. They spread from there... and the new threads are all in unhardened material. About the only use I would say go ahead and drill - is a racer or other project where overall reliability has a MUCH lower priority than immediate capability...

Cant answer about your brothers head - but NOTHING is as hard as MY brothers head...(we're business partners lol)
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Unread 01-10-2015, 02:43 PM   #3
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I went from 3.73 to 4.56, same carrier....but you do have to drill for the TrueTrac, you'll want to take it to a machine shop or off-road shop to get drilled, it's a pain in the ***.
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Unread 01-10-2015, 03:24 PM   #4
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Quote:
Originally Posted by LVCapo View Post
I went from 3.73 to 4.56, same carrier....but you do have to drill for the TrueTrac, you'll want to take it to a machine shop or off-road shop to get drilled, it's a pain in the ***.
Now I am curious - http://www.quadratec.com/products/16100_602.htm shows the same carrier for 3.73 and numerically higher (which would include 4.56 and uses the stock diameter gear set) - I understand you would need to drill the 3.54 and lower to use IT with any 3.73 and up set (and my opinion on drilling remains the same)... what is the issue with using a carrier that claims to use the gear set he wants to run?
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Unread 01-10-2015, 04:13 PM   #5
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If I remember correctly, the holes are 7/16" and the TrueTracs are 1/2". I had Adams Driveshaft drill mine out.
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Unread 01-10-2015, 04:23 PM   #6
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If I remember correctly, the holes are 7/16" and the TrueTracs are 1/2". I had Adams Driveshaft drill mine out.
Oh that makes more sense - drilling is done to the ring - not the carrier.

I would think inserting the carrier down to 7/16 would be a better option... drilling the ring weakens the shoulder of the bolt hole...
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Unread 01-10-2015, 04:31 PM   #7
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From what I've researched, If you're using the stock 3.73 ring gear, it has 1/2" ring gear bolts. The Detroit Truetrac has 7/16" bolt holes. Therefore, the holes on the Truetrac need to be enlarged to 1/2" in order to properly fit with stock 3.73 gear set.

Assuming that is correct, if you upgrade to an aftermarket gear set such as 4.56, will you be able to reuse the same Truetrac?
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Unread 01-10-2015, 04:35 PM   #8
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If I remember correctly, the holes are 7/16" and the TrueTracs are 1/2". I had Adams Driveshaft drill mine out.
My bad, other way around, the TrueTrac is 7/16", the holes are 1/2"....the True Trac needs to be drilled out. The problem is the metal is 56-58 on the Rockwell scale.
Reading back over this he may not need to drill if it's the front, I think the D30 is 7/16"....
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Unread 01-10-2015, 04:38 PM   #9
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Quote:
Originally Posted by 98tjsahara View Post
From what I've researched, If you're using the stock 3.73 ring gear, it has 1/2" ring gear bolts. The Detroit Truetrac has 7/16" bolt holes. Therefore, the holes on the Truetrac need to be enlarged to 1/2" in order to properly fit with stock 3.73 gear set.

Assuming that is correct, if you upgrade to an aftermarket gear set such as 4.56, will you be able to reuse the same Truetrac?
Correct on the first part....

On the aftermarket gears, yes... I went from stock 3.73 to Yukon 4.56, no problems at all.
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Unread 01-10-2015, 04:38 PM   #10
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Oh great.

Now MY head just went to mush...

lol
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Unread 01-10-2015, 04:40 PM   #11
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Oh great.

Now MY head just went to mush...

lol
Yeah yeah, cut me some slack, I'm still on a good Vicodin diet.....
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Unread 01-10-2015, 04:57 PM   #12
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Re-gear when the True Trac is first installed and don't worry about it. No reason to pay labor for the same job twice plus you don't have to worry about drilling.

I'm Running True Tracs front and rear in my 13 JK with Yukon 4.88's (with 35x12.50R17 Goodyear MTR/K) and no drilling was needed front or rear.
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Unread 01-10-2015, 04:59 PM   #13
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Good price on Yukon Gears and install kits...

http://www.4ws.com/jeep-wrangler-jk-...ront-rear.html
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Unread 01-11-2015, 12:33 PM   #14
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If you stick with factory gears, the install can be done at home with basic tools and a dial indicator to check backlash. The pinion depth does not change, you just have to make sure backlash is in spec by adding/subtracting shims to move the ring gear side to side. Which is not always needed, sometimes it is a direct swap.
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Unread 01-11-2015, 05:13 PM   #15
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I would like to thank everyone for their help. I should have specified this is for a rear d44. I would like to put it in now with the 3:73 and then regear later to 4:88 and use the same carrier. This is going to be a DIY project. But I don't want to drill out the holes not because I can't but I would imagine it is hardened. It seems like maybe a grizzly locker may be the way to go.
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