How much suspension lift before I have to do stuff?

[Beej]

Hey folks,

I think this is my first post on GX470. Im coming over from the 80 forum. I'm seeking to build something less aggressive/involved than the my 80.

One of the things I got right on my 80 build was that I got 3 inches of lift and only had to do caster correction.

My question becomes, how much lift can I get without having to do too too much stuff. The GX has a better departure angle than the 80 so Im not planning to do bumpers on this build. Ive got the truck on 255 / 75 / r17 on stock rims. The new build will have drawers and carry tools and equipment for recovery/camping/etc., which can get quite heavy in the rear.

Even though it seems like I might be trying to keep cost down, Im actually not. I do my own work; Im trying to keep effort managable. I have Dobinson progressive coils and King Shocks on the 80 and I like that set up quite a lot.

I do WANT lift because I feel like the fuel tank hangs low on the GX and I know the breakover angle is not as good as the 80.

I understand lift is a common topic but im specifically interest in what stuff needs doing as you go up, not the lift brands or ride quality.

I know diff drop comes at just 2". Is that right? What about brake lines? UCAs?

Thanks in advance for any replies!

Happy trails

-- Beej

 

[OG Zuninja]

I'm no expert by any stretch but I have been doing a lot of researching. Take what I say with a grain of salt but I'm sure the more experienced folks will chime in and either beat me over the head (well deserved) and/or offer better advice.

I understand lift is a common topic but im specifically interest in what stuff needs doing as you go up, not the lift brands or ride quality.

With IFS, depending on the mileage of the CV axles, there's a decent chance of tearing the boots after lifting. You can replace the boots or upgrade to GX460/5th gen 4Runner front axles. The latter is generally recommended. Not trying to scare you but giving something to keep in mind.

I know diff drop comes at just 2". Is that right?

Diff drop is not recommended. All it will do is create clearance issues with skid plates and such. This video has some good info: More Harm Than Good? Toyota Diff Drop Truth vs Myth.
In fact, that channel is loaded with good info.

What about brake lines? UCAs?

For a 2" lift, the OE brake lines are sufficient. Same thing goes for UCAs. 2" lift is generally the limit before you need to consider new brake lines, UCAs, sway bar links, etc.

Hopefully that helps.

 

[Jstawgn]

Above 2" lift, you need to start adding
1. Upper control arm. A must in my opinion.
2. Panhard correction.
3. Upgraded bump stop if you run longer rear shocks.

The Dobinsons variable rate rear spring is really nice. You can get their normal 12.7" rear long travel shocks if you don't have KDSS. Driveshaft would rub on gas tank skids with this long trsvel rear shocks. Most people get away by trimming the skid and flipping the driveshaft.

 

[Beej]

With IFS, depending on the mileage of the CV axles, there's a decent chance of tearing the boots after lifting. You can replace the boots or upgrade to GX460/5th gen 4Runner front axles. The latter is generally recommended.

Hey, thats a good heads up! I do have one torn boot already. Ill see about the upgrade since Ill be in there.

And Ill check out the video. Already something that doesnt need doing. Ha! Thanks.

Above 2" lift, you need to start adding
1. Upper control arm. A must in my opinion.

But not a must AT 2"? This one was making good sense to me for ease of alignment and such but if its not going to help, I will happily do without Thanks!

 

[Rednexus]

UCAs aren't terribly expensive if you get a bundled lift kit. And, your OEM UCA bushings are probably pretty worn out anyway. So, IMO it's worth spending the extra $300-600 to take care of them.

However I would recommend extended rear brake lines. They might not rip at 2" but they are awfully taught when you flex the rig out. MUSA Metal Tech rear lines are only $75. On the flip side, my front lines feel just fine despite being at nearly 3" of lift.

For CVs, I've had good luck with All-Pro high-angle boots, re-booted on my OEM GX axles with 197K on them. I've gotten around 3 years between re-boots, which is not bad for a lifted Toyota. But, you'll never have the boots last 6-7+ years like they do on a stock-height rig with OEM Toyota boots on it.

 

[Beej]

Thanks for replies.

Sounds like, if Im staying under 3" of lift, I wouldnt be facing too much additional support work...

1) UCAs
2) Axle boots (poss upgrade 5th gen 4r/gx460)
3) Extended rear brake lines
4) Bump stop drop
5) Panhard correction

Anything else?