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Jul 2, 2018 | 02:17 PM

Burnett03

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Help me out guys

Finally got my turbo kit done and somewhat tuned. First time 1/2 throttle boost pull and it blows the tires off. Well one tire, I'm pretty sure I have the non posi rear end.

2005 2WD 4.8 RCSB
s475 turbo

1. What rear do I have? 10 bolt 8.6?
2. Should I just put a tru trac in it?
3. Anything else that should be done besides better tires obviously?

Thanks guys.

Jul 2, 2018 | 02:27 PM

Atomic

I have a gauge for that

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From: Huntsville, AL

Do you have the G80 code in your glove box? Either way an upgrade POSI is a good idea. I like the eaton LSD but the trutrac is popular also.

Jul 2, 2018 | 02:51 PM

Burnett03

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I'll take a look. I doubt I have the G80 code. I think I just have the regular non posi.

Jul 2, 2018 | 03:05 PM

darkirish63

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From: NC

Quote:

Originally Posted by Burnett03

Finally got my turbo kit done and somewhat tuned. First time 1/2 throttle boost pull and it blows the tires off. Well one tire, I'm pretty sure I have the non posi rear end.

2005 2WD 4.8 RCSB
s475 turbo

1. What rear do I have? 10 bolt 8.6? - YES!!!
2. Should I just put a tru trac in it? - YES!!!
3. Anything else that should be done besides better tires obviously? - Some kind of traction control / Assassins / CalTracs / Something...

Thanks guys.

Short but to the point answers...

Jul 2, 2018 | 03:22 PM

Burnett03

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Quote:

Originally Posted by darkirish63

Short but to the point answers...

That's what I wanted, thanks! What size tires can fit under these trucks without cutting? 295, 305?

Jul 3, 2018 | 09:20 AM

darkirish63

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From: NC

Quote:

Originally Posted by Burnett03

That's what I wanted, thanks! What size tires can fit under these trucks without cutting? 295, 305?

Have you lowered it, yet?

Jul 3, 2018 | 09:40 AM

Burnett03

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Quote:

Originally Posted by darkirish63

Have you lowered it, yet?

That's next on the list.. Probably a 4/6 drop.

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Jul 5, 2018 | 08:39 PM

RedXray

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From: MAGA COUNTRY

Quote:

Originally Posted by Burnett03

That's what I wanted, thanks! What size tires can fit under these trucks without cutting? 295, 305?

With a 4/6 drop using a 20" wheel, a 275/45/20 is maxed out with a little rub on hard dips and bumps. That tire has a diameter of 29.7 so if you are using a different wheel size that will help you dial in a tire size.

https://tiresize.com/calculator/