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Old 07-02-2018, 02:17 PM
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Default 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.
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Old 07-02-2018, 02:27 PM
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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.
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Old 07-02-2018, 02:51 PM
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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.
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Old 07-02-2018, 03:05 PM
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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...
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Old 07-02-2018, 03:22 PM
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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?
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Old 07-03-2018, 09:20 AM
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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?
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Old 07-03-2018, 09:40 AM
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Originally Posted by darkirish63
Have you lowered it, yet?
That's next on the list.. Probably a 4/6 drop.
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Old 07-05-2018, 08:39 PM
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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/


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Old 07-06-2018, 10:13 AM
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Originally Posted by RedXray
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/


https://www.youtube.com/watch?v=4pz11p238dc

295/55/15 should be just fine then.. Thanks for the help. Your truck looks awesome.
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Old 07-07-2018, 01:05 PM
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I have a 3/5 drop and I have ran a 305 before but there are more options in the 295 range
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