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Old 12-14-2014 Thread Starter
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Post LT to LTZ Rim Swap How To

First off thanks to LazerBlue07SS and RYD SLO for helping me with this swap.

Alright boys and girls. I have a 2008 Impala LT with 2013 LTZ wheels and tires on them. To do the swap, it is not as simple as a wheel and tire change.

LT's and LTZ's came with different suspension options LT being FE1 or FE2, and LTZ with the FE3 suspension packages. The numbers going from softest to firmest FE1-FE4.

The issue with just doing a wheel swap from the LT 16's to the LTZ 18's is the rear strut assembly clearance on the lower spring plate. (See Pics). Thus prompting you to have to change the rear suspension. The fronts have plenty of clearance with stock strut assemblies (for me) but the rears will rub.

In order to have the 18" wheels whether being SS or LTZ wheels work, you NEED to change the rear suspension if you have an LS or LT.

Heres what I ordered and worked. You can see in the pics that the new strut assembly allows for slightly more clearance on the lower spring plate. (Its a tad higher up)

- I used KYB-SR4103 and KYB-SR4104 strut assemblies for the swap to work.


- I used 2013 Impala 18" LTZ wheels but LTZ wheels from 08-13 should work. 18x7, on P235-50-R18.

Pictures:
(Left to Right - Top to Bottom)
1. Old Impala Wheels
2. New Wheels Installed
3. 16" Wheel Front Clearance
4. 18" Wheel Front Clearance (Plenty of Room)
5. 18" Wheel Rear Clearance Before Strut Swap (Rubs)
6. 18" Wheel Rear Clearance After Strut Swap (More room)
7. KYB FE3 Next To Original FE1 Strut (Lower Spring Plate is Higher)

Well, that about does it fella. Hope this helps you guys out if you plan on doing an 18" wheel swap on an LT or LS.
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2008 Impala LT (LTZ Clone)
-2013 LTZ 18" Wheels
-FE3 Rear Suspension
-Rear Trunk Lip Spoiler
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Old 12-14-2014
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Great write-up! The only thing I will mention is that you MAY need to change the rear suspension. For whatever reason, some people don't run into the fitment issues with the FE1 or FE2 suspensions.

~Jeff
*2001 Impala Ls - 134k
Precision 6262 Turbo, ZZP Z3, CXRacing intercooler, ZZP 3" Cat-back, Muffler delete, Bosch 42.5# Injectors, Bosch fuel pump, CTS-V Brembos, Stainless lines, CM GP springs, Dorman solid sway bar, SPEC-D LED headlights, LED heads and fogs, Quad tails, C5 reverse lights, All LED interior, LED 6 gauge cluster retrofit, LED puddle lights, LED underglow, Debadged, Dipped emblems, Color-matched trim, Kenwood DDX271, Polk Audio dxi6500 components, Polk Audio db690, Hifonics GLX100.4, 2x Polk Audio db1240 in custom box, Hifonics ZRX1800.1D, KMC District, Nitto NT555G2, SS tail covers, SS spoiler, SS Lip, 20% tint, Black mesh grille

*1999 Escalade - 150k
Winter daily on 22s

*2005 GTO - 72k
LS2/6SPD FOR SALE

*2014 Impala LT Limited - 35k
"Dad's ride"

*1992 Caprice Wagon - Sold @ 195k
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Old 12-14-2014 Thread Starter
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Ahh alright. I mean my tire did spin even with it mounted with the original suspension but the clearance, as you can see, was so tight. I didnt want to risk it rubbing.
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Old 12-15-2014
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Yes, the clearance is very tight, and upgrading the parts definitely gives you some more wiggle room. My rear tires are extremely close, but not touching. I checked the tires on a lift about a thousand after putting them on, and didn't see any grooves or signs of wear from the strut mount. Definitely better to be safe than sorry though!

~Jeff
*2001 Impala Ls - 134k
Precision 6262 Turbo, ZZP Z3, CXRacing intercooler, ZZP 3" Cat-back, Muffler delete, Bosch 42.5# Injectors, Bosch fuel pump, CTS-V Brembos, Stainless lines, CM GP springs, Dorman solid sway bar, SPEC-D LED headlights, LED heads and fogs, Quad tails, C5 reverse lights, All LED interior, LED 6 gauge cluster retrofit, LED puddle lights, LED underglow, Debadged, Dipped emblems, Color-matched trim, Kenwood DDX271, Polk Audio dxi6500 components, Polk Audio db690, Hifonics GLX100.4, 2x Polk Audio db1240 in custom box, Hifonics ZRX1800.1D, KMC District, Nitto NT555G2, SS tail covers, SS spoiler, SS Lip, 20% tint, Black mesh grille

*1999 Escalade - 150k
Winter daily on 22s

*2005 GTO - 72k
LS2/6SPD FOR SALE

*2014 Impala LT Limited - 35k
"Dad's ride"

*1992 Caprice Wagon - Sold @ 195k
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Old 12-15-2014
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Glad it worked! Looks good.

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Old 12-18-2014 Thread Starter
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On a side note; How long does it take for the new strut assemblies to settle? My rear ride height is significantly taller after the install and is a little too tall actually.

2008 Impala LT (LTZ Clone)
-2013 LTZ 18" Wheels
-FE3 Rear Suspension
-Rear Trunk Lip Spoiler
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Old 02-25-2015
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Thanks for the write up. How's the ride with the KYBs? Stiffer ride, better handling?
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Old 05-01-2015
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I know this forum is old but what exactly is it that i need to get to put factory LTZ 18s on my 13 impala LT? just the strut?
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Old 05-02-2015
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Quote:
Originally Posted by ImpKing View Post
I know this forum is old but what exactly is it that i need to get to put factory LTZ 18s on my 13 impala LT? just the strut?
I suggest you try fitting the wheels first before buying any additional parts that you MAY not need.
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Old 05-04-2015
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Quote:
Originally Posted by RYD SLO View Post
Great write-up! The only thing I will mention is that you MAY need to change the rear suspension. For whatever reason, some people don't run into the fitment issues with the FE1 or FE2 suspensions.


He went from 16" to 18" and the tires will rub, but if you go from 16" to 17" then you should be okay. I have the Monroe quick struts and 17" tires and the rear tires are very close to the strut plate, but do not rub. Great write up.

2006 Impala LTZ/SS 3.9 L V6
Magnaflow Catback Exhaust
5 Piece Billet Aluminum Grille, Chrome Side Pillars
General Tire Altimax RT43 Tires
K&N High Flow Air Filter with modified airbox
Monroe Quick Struts, 35% Window Tints
GM Strut Tower Brace Bars and Don Rome Brackets
Leather Steering Wheel Cover, Mud Flaps
Chrome Licence Plate Protectors, SS Badges
Motomaster Eliminator Battery (925 CCA)
Wagner Rotors and Monroe ceramic pads
5" Android Smart Mirror
Overkill Engine Tune!
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Old 05-14-2015
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Ah, I see. Thanks, I'm going from 17s, cant wait! Great write up!
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Old 05-14-2015
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Just another note. Anybody going from 18s to 16s (for the winter) there are zero fitment issues. Only issue exists for SOME going to 18s from non 18s (ie LT).

2009 Impala SS (sold 3/2012)
2014 Impala Limited LTZ 3.6 V6(traded 7/2019

2017 Cadillac XTS Platinum V Sport 3.6TT AWD
2017 Buick Envision Premium AWD 2.0 Turbo
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Old 01-22-2016
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Very interesting. I put LTZ wheels and tires on my '10 LT and had no issues except having the dealer programs the TPMS to my car. Guess I got lucky..
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Old 01-25-2016
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Quote:
Originally Posted by 10ImpalaLT View Post
Very interesting. I put LTZ wheels and tires on my '10 LT and had no issues except having the dealer programs the TPMS to my car. Guess I got lucky..


The old LTZ's like my car had 17" wheels, but the newer LTZ's (2012+) are 18" wheels on the 8th gens.

2006 Impala LTZ/SS 3.9 L V6
Magnaflow Catback Exhaust
5 Piece Billet Aluminum Grille, Chrome Side Pillars
General Tire Altimax RT43 Tires
K&N High Flow Air Filter with modified airbox
Monroe Quick Struts, 35% Window Tints
GM Strut Tower Brace Bars and Don Rome Brackets
Leather Steering Wheel Cover, Mud Flaps
Chrome Licence Plate Protectors, SS Badges
Motomaster Eliminator Battery (925 CCA)
Wagner Rotors and Monroe ceramic pads
5" Android Smart Mirror
Overkill Engine Tune!
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Old 12-05-2018
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So... going from 17" wheels/tires on a '13 LT to 18"wheels/tires would require more than the 18" rims/tires or not???
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