Need help/ideas for rubbing fender liner

konfidential · Jul 1, 2022

I’m running a 3/5 ihc drop on my quad cab with 22” wheels w/ 285/45/22 tires… running QA1 shocks all around…TS514 up front…ts509 in back

Problem I’m having is I hit the fender liner pretty often on medium and soft dips…I put some bell tech bumpstops to help slow down the suspension travel and also I ordered some shock extensions that I haven’t put on yet to see if that can help.

Anyone have any ideas to help from hitting the liner so often.. any tricks or mods I can do?…at the rate I’m going, I’m going to need a new liner soon

Daw14 · Jul 1, 2022

A heat gun should soften it so you can adjust accordingly.

Bigskyroadglide · Jul 12, 2022

Just installed my ihc 4 inch drop this weekend. Same 285/45/22 tires o factory 22 RT wheels. I rub occasionally probably looking at a smaller tire to cure

konfidential · Jul 12, 2022

Bigskyroadglide said:
Just installed my ihc 4 inch drop this weekend. Same 285/45/22 tires o factory 22 RT wheels. I rub occasionally probably looking at a smaller tire to cure

I rubbed completely through my liners…I’m just gonna deal with it till it’s time to change tires.. I’m going with a 29 in tire next time..45 series are 32” I believe

Bigskyroadglide · Jul 12, 2022

In for alignment today, after installing the ihc 4 inch drop. After alignment, no rubbing even over some large road transition. Only driven about 40 miles since alignment but so far so good

Rakillia · Jul 14, 2022

I have the same problem but not that worried about liner. As it sits the tire is 32" tall and the battery tray is 35" off the ground. 3" of tire travel is a bit tight. 80mph on the highway and I've hit the corner of the tray on a bad dip. Stock spring, viking shock 275/60 R20. What are the 4" drop ppl doing? I looks like I could raise the corner of tray about an inch.

Bigskyroadglide · Jul 15, 2022

I spent a 1/2 hour on the phone with ihc tech support today. Come to find out, if you install according to the you tube video without the bottom rubber spring spacer, it's a 5 inch drop vs a 4. So on 2 wheel drive, you need to use the factory upper and lower rubber spring isolators. I'm at 31.5 inches installed height, on a 285/45/22 tire. His comments were put the lower rubber spring isolator in or get a 40 or 35 series tire. The 45 series will rub.

konfidential · Jul 16, 2022

Bigskyroadglide said:
I spent a 1/2 hour on the phone with ihc tech support today. Come to find out, if you install according to the you tube video without the bottom rubber spring spacer, it's a 5 inch drop vs a 4. So on 2 wheel drive, you need to use the factory upper and lower rubber spring isolators. I'm at 31.5 inches installed height, on a 285/45/22 tire. His comments were put the lower rubber spring isolator in or get a 40 or 35 series tire. The 45 series will rub.

Boy I tell ya…the instructions they gave me said no such thing…I appreciate you actually reaching out to them.. because when I contacted them, all they said was “oh it’s your shocks..gotta use better shocks” I’m like your kit says it’s designed for “stock shocks”…I’m running QA1s up front with shock extenders to keep it from rubbing so dang on much with my 45 series tires.

Rakillia · Jul 19, 2022

I've been researching this a bit. 30" seems like the max height for the tire. 5" of travel should be plenty. I like the stock mopar 5 spoke wheels so I'll stick with the 20x9(plus I hate low-pro tires). You can't just go by the 45 number, you have to use a tire calculator. https://tiresize.com/calculator/
A 285/45/20 tire is 30" tall and 11.2" wide. Only problem is tires in that size are expensive. This truck is more for burnouts than autocross. I don't want $380 each tires. I could go with a 295/40/20 but then I'd need a 20x10 wheel. I'll let y'all know what I end up doing

Bigskyroadglide · Jul 19, 2022

Update, I installed the lower rubber spring isolater, I went from 31.5 ride height in front, (without isolater) measured from the floor to the lower lip of the front wheel well to 32.5, a change of exactly 1 inch.

The amount of distance between the top of the tire to the fender liner is 3.25 inches. So I get a total of 35.75 inches. Which should allow for no rubbing. I drove around last night after getting the truck aligned again.

On a bridge transition where the step up and down is about 2 inches, going up, no rub, coming down a slight rub, speed was about 45 mph. Hard launch, with front dropping no rub, down hill over some rough road, no rub. So, it appears a quick hard drop will produce rubbing to some degree but other situations may not. I'm on 22 x 9 stock RT wheels

konfidential · Jul 19, 2022

Bigskyroadglide said:
Update, I installed the lower rubber spring isolater, I went from 31.5 ride height in front, (without isolater) measured from the floor to the lower lip of the front wheel well to 32.5, a change of exactly 1 inch.

The amount of distance between the top of the tire to the fender liner is 3.25 inches. So I get a total of 35.75 inches. Which should allow for no rubbing. I drove around last night after getting the truck aligned again.

On a bridge transition where the step up and down is about 2 inches, going up, no rub, coming down a slight rub, speed was about 45 mph. Hard launch, with front dropping no rub, down hill over some rough road, no rub. So, it appears a quick hard drop will produce rubbing to some degree but other situations may not. I'm on 22 x 9 stock RT wheels

I’m putting the lower coil isolators back on this weekend. My liners are completely gone to sh*t from all the rubbing. I live in Baytown TX.. east of Houston TX. We have decent freeways with the occasional up and down bounce. I have them all the locations memorized lol.

Rakillia · Jul 19, 2022

I always had both insulators. It made the install harder but metal on metal just didn't sound right to me. I don't rub much around town. Sometimes if I'm taking a corner too hard. Its the highway that concerns me. I've come down hard off overpasses. I am going to break something eventually.

Simpsj2 · Oct 11, 2023

Two wheel drive doesn’t come with top and bottom isolater. What did you use for bottom if you don’t mind me asking.

Simpsj2 · Oct 11, 2023

Rakillia said:
I always had both insulators. It made the install harder but metal on metal just didn't sound right to me. I don't rub much around town. Sometimes if I'm taking a corner too hard. Its the highway that concerns me. I've come down hard off overpasses. I am going to break something eventually.

Yeah. I don’t like the metal on metal either. Especially since they’re not a coil notch to keep it centered. In process right now of fixing. Then hopefully I’ll be able to enjoy the truck more

Racer9 · Oct 14, 2023

This is a timely discussion for me, thanks. I have the IHC 4/6 kit now and am planning to install over the winter. I would like to do the 5/7 but was concerned about fender rub.
I am also switching to 17" wheels because I don't like the appearance of 22's. I am shopping for new tires, and was settled on 265/70R17's which are 31.3" tall, vs the 32" 22's.
Now I'm wondering if I should go a little smaller. There are more "touring" type tires available in smaller sizes.
Any thoughts?

Racer9 · Oct 14, 2023

A quick bit of research tells me that a 255/70/17 is 31.1", 245/70 is 30.5" but loses tread and rim width. A 255/65 is 30.5 tall and keeps my tread and rim width.

Need help/ideas for rubbing fender liner

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