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05-01-2012, 08:06 AM #1
After talking to my neighbor. who is also my mechanic. I am not one. If I take it off I can put it on but that’s it. Here is what I am planning at this time. It will take a little time, but here it is:
(Keep in mind I have 2008 Silverado WT Ext. Cab V6 4.3)
Cold Air Intake
Cut off Muffler replace with pipe
Thorndale body spacer
Rear axle from 3.23 To 3.73 plus differential
Don’t know where I want to go here- 295/70/17 or 305 or 315 tires
Last edited by Curky; 05-01-2012 at 08:33 AM. Reason: I was wrongTim Walters (Curky)
Wrangler AT/S 265/70R17 - Trail-FX window vents - Husky fitted splash guards - Silver Star zXe - Leveling kit -
05-01-2012, 08:19 AM #2
The 295s are already measuring a bit over 33" diameter for the tires. With a level kit you won't want to go any bigger than that or you'll have rubbing issues. I'm no expert myself, but I've read from several posts on here and elsewhere that the body spacer doesn't actually give you anything. If I'm wrong, someone will correct me.
Out of curiosity, why are you planning to go from 4.23 gears to 3.73? It seems you're trying to get a bit of performance from your other upgrades and particularly if you're looking at bigger tires, that won't give it to you. You'll probably get better mileage, but less low end.
Also, don't forget to get your speedometer calibrated with the bigger tires whether you do that with an aftermarket tune or alone.
To Be Completed (Eventually):
6" BDS Suspension lift | KingShocks Front and Rear Coil Overs | 4.56 Gears | 35" A/Ts (TBD) | Cervinis 07-12 Silverado Ram Air Hood | Fab Fours Front Winch Bumper (CS07-H2051-1) | Fab Fours Full Size Rear Bumper (CS07-W1850-1) | RX-2 Series Main Grille (Black) | Line-x Bed and wheel wells | Skid Plates | Rizor Automated Tonneau Cover | Custom Bed Insert | RBP RX-3 Series Nerf Bars | Kenwood Excelon DNX9990HD | JL Audio Stealthbox (2x500RMS) | JL Audio HD 1200/1 Class D Mono Amp | JL Audio C5-653 Components (Front) | JL Audio C5-650 Components (Rear) | JL Audio Slash v2 300/4v2 Class A/B Amp
05-01-2012, 08:32 AM #3
He said that is as big as I could go w/o rubbing (295)if I went any bigger we could do some cutting but I don't want to do that.
The gears I was wrong it is now 3.23 and I want to go 3.73. My bad…
For the speedometer he said as long as we get the right programmer that will fix that.
05-01-2012, 08:36 AM #4
Yeah, I think you'd be happy with the 295s and then not having to worry about cutting. The gears makes a lot more sense. And yeah, I assumed you'd take care of the speedo with the programmer/tune, but just thought I'd mention it. When I was 18 I got a ticket driving my Dad's truck because the Speedo hadn't been recalibrated, and he failed to tell me. I think that's the one time my dad ever cut a corner with one of his cars. He did pay for the ticket though, so couldn't really be upset.
05-01-2012, 11:28 AM #5
*If you're going to change gears and use 33s (295 70 17s, which I agree is probably the largest you can go without cutting), I'd recommend moving to 4.10 vs 3.83s. Check out this link as it will provide you some guidance on tire size and gear ratio.
*X2 on the Throttle Body Spacer...I've read many posts in which they are NOT recommended.
*Regarding the straight pipe, do you want this strictly for sound?
Last edited by mfleetwood; 05-01-2012 at 02:55 PM. Reason: type o
Mike (Denver, CO) - 2008 Sierra 1500 Z71 SLE 5.3L 4WD
SUSPENSION: Rancho 4" Suspension Lift; Rancho RS9000XL Shocks; Rancho Skid Plates; Rancho MyRide Wireless Shock Controller;
TIRES: BFG All Terrain KO 315/70/17
DRIVE TRAIN: 4.56 Gears; Detroit TrueTrac Differential; True Cool 40k Transmission Cooler
PERFORMANCE: DiableSport Predator Tuner; Custom Tuned by Diablew; Magnaflow Exhaust; AFE Cold Air Intake
ELECTRONICS: Kenwood DNX6180 Touchscreen; Subthump box w/10" Kicker; Driver Information Center (DIC); Rear View Camera
ACCESSORIES: Westin Brush/Grill Gaurd; Westin Nerf Bars; Truxedo Tonneau; 20% Tint; Tow Mirrors w/Heat & Signals
05-01-2012, 12:11 PM #6
See that is why I posted this. I’m not a mechanic; He is and has been his whole life. He has been doing work to all my cars for 12 years. He has built some sweet race cars. He has a sweet Dodge truck and has done a lot of work to it. With that said, don’t mean he is right. This is just what we talked about.
The straight pipe? I don’t mine the sound but I think he is trying to save me money because it has a small rattle inside. I forget what he said it was. He said it is no big deal it is just annoying.
The gears- see it is 2WD and he said we should change the gears. That it will help with what I’m looking for. Then I asked if I could get both back tires to spin. He said it would probably be cheaper to buy the whole axle used. I don’t know why he didn’t say 4.10.
If I say we are going 4.10. It still only cost me a case of beer.
This is why I love it here.
05-01-2012, 12:36 PM #7
Curky, you may have a locking differential already.Look in the glove box and there will be a sticker with a list of codes. If you have the locker it will be listed as G80, and the next G code will be your gear size. Also, check out the thread regarding the G-80 (link pasted below).
-G80=locking rear differential
Lastly, before you fully commit to a straight pipe, you may want to take off your muffler and see how it sounds. It will be very loud, all the time. I think it would be worth it to buy a muffler if you really need one.
Last edited by mfleetwood; 05-01-2012 at 12:41 PM. Reason: added info
05-01-2012, 12:54 PM #8
I 2nd the 4.10 swap. I have a 93 GMC 4.3 5spd. I did a 4.10 swap and I love it! It is a real blast to drive now. You don't have to spend alot of money to get a good sounding muffler. Look at the Thursh Welded series mufflers. Good sound and only about 35.00 dollars.
Its sounds like a good solid plan, can't wait to see it come together. Good Luck!
05-01-2012, 01:49 PM #9
05-01-2012, 01:53 PM #10
Did you see the G-80 as well, in conjunction with your gear RPO code? If so, you already have your limited slip mod taken care of already
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