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Old 01-03-2011, 01:06 AM #16
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To Flexus

Quote:
Originally Posted by Flexus View Post
Driven properly, locking diffs will prevent damage that will occur without them. I'd be happy to offer tips.
I have found this statement to be true in my limited experience (1 year) with an ARB front locker complementing the factory rear e-locker on my IFS 2000 4Runner with 32's. One of my best wheeling buddies doesn't believe it. Many posters on the IFS forums don't believe it. (See Thai's post above.) I did read your 2003 article. Very impressive. If you could develop the quote above with a summary of "tips" in this thread, I and a bunch of other IFS wheelers could really benefit. Thanks.
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Old 01-13-2011, 03:38 PM #17
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Old 01-14-2011, 03:10 AM #18
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Quote:
Originally Posted by Flexus View Post
I was the first person to put an ARB RD90 in a 3rd Gen 4Runner IFS. That truck is still running today with no breakage on 33"s and a Supercharger. That is a 7.5". The spiders were the weak point in the 7.5".

Here is an article I did years ago. ARB Air Locker for Toyota IFS

It is also running an RD23 in the rear which is no longer made. I was the one who figured out it would fit in the third Gen back in 2000.

I also helped ARB figure out RD111 for the 4th Gens.

Driven properly, locking diffs will prevent damage that will occur without them. I'd be happy to offer tips. Retrofitting a 4th Gen 8" into a 3rd Gen 7.5" truck isn't worth the effort. Better to SAS at that point but the 7.5 is strong enough if cared for. The 8" also had some mount breakage issues. Not sure if Toyota fixed that. Guess I'll find out now that I have a 120.

The tie rods on the 4th Gen are thinner thann the 3rd Gen ones.
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Old 01-15-2011, 02:05 AM #19
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Quote:
Originally Posted by troyboy162 View Post
i dont know what flexus had in mind but its going to be the same rules of normal IFS

basicaly anything that causes the joints to be at extreme angles and/or stressed:

1.wheel turned drasticly
2.suspention drooped
3.wheel hop or bounce
4.excessive wheel spin

any one of those alone is ushualy ok but when 2-3 of them are present, you should be carrying spare CV's

lockers help in that they nearly eliminate 3 and 4 in most situations. also while your locked you can take alternate lines that help prevent 1 and 2.
You are absolutely right. If you hang out on pirate you'll see plenty of straight axle trucks breaking birfs under mild conditions. Many of those people don't have the steering stops adjusted properly, go beyond the safe angle and, wham, instant oatmeal. The birfs on an IFS truck like a 3rd Gen are bigger than a SA truck but they were designed for four angles of motion instead of two and they had to hold up to a V6. The weak links were typically the two spider pinions in the 7.5" IFS diff or, believe it or not, the trucks with manual hubs (Tacos) which had smaller output shafts. Early automatic hubs were pretty weak too. 4th Gen 4Rs have even bigger birfs (with live hubs as most do) to cope with the V8. They have a large IFS carrier that is as big as the full size LC one. The weak part on the 8" IFS is the mounting arm. Break that and everything goes south. Toyota has a thicker one but early FJC folks took to welding theirs.

My previous 4Runner has an ARB locker up front. camburg arms, TRD Tundra springs with a 1" top out spacer, long travel shock and a 1" diff drop. It has 11" of front wheel travel. The wheel wells were heavily clearanced to allow full stuff of 33" tires. It got use on some pretty good trails. This is Golden Crack in Moab. No breakage for 12 years and still going; so many things are possible.

Last edited by Flexus; 01-15-2011 at 02:17 AM.
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Old 01-31-2013, 03:52 PM #20
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I have been running an Aussie locker in the front for some time now and never have ran into problems. I do not abuse the crap out of my runner off road however.
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Old 08-03-2013, 03:53 PM #21
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Thumbs up Rd90

I'm very happy with my locked front end.... I baby it a bit, but it's also taken its fare share of abuse. I read the article previously mentioned, did an exhausting amount of research, and chose to go with the rd 90. It's got about 15k miles on it so far with a solid 1k off road( some pretty narly stuff, and i use it as my daily driver) . Works perfectly. (I also chose not to lock the rear end). As was mentioned in another post, you just use common sense, don't lock it and step on the gas when you know it's going to stress the set up. A locked front end will compensate for the fact that we (most 4runer owners), don't have the articulation and traction, of solid axel front end vehicles. I've yet to come to an obstacle that has it hasn't gotten over (except for the one time I got stuck in 2 feet of mud.... But then few vehicles wouldn't).
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Old 09-05-2013, 08:27 PM #22
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My experience

I run a 1991 V6 Pickup with the 7.5" IFS. I have a 3" lift with 33"x12.5" tires. I am very much not nice to it....i do consider myself a good driver.

The truck used to have a Detroit limited slip/aussie locker in front. With this set up it sucessfully snapped a front axle shaft, ruined the limited slip, and setup the manual locking hubs (converted from auto hubs) for the next failure. I felt like the limited slip was a bad idea. I would be in a situation with one tire spinning, then everything would catch really quick, and it caused a lot of bouncing and ultimately i blamed it for snapping the front axle.

I have since put a spartan full locker in the front and repaired everything. I have torn off the manual hubs on both sides twice (sheared off 6 stock bolts and the 2 studs) from the wheel plate. read-V6 has a lot of power. I have since replaced the wheel plates and installed new aisin manual hubs using ARP high-strength bolts and added 4 pins each (6 bolts + 6 pins each). That should solve the problem with 33's. I've also broken my idler arm from the steering while driving quickly over moderately rough hill terrain.

Interesting note... I've broken a lot of stuff, but never a cv joint, never a tie rod.

Advice...
1) Locking the front puts really serious stress on the IFS. It's great traction, but you better be willing to beef up your rig, or fix stuff.
2) When i can afford it i am still planning on installing high strength CV/axles in the front
3) I don't plan on running bigger than 35's
4) Drive slow, smart, and careful. It's a different rig. When you are open diff, you have to keep your momentum and sometimes brute force your way through, or gas it and pray...once your locked, this is a very bad idea. Take everything slow, think about what your truck is doing, and find your way through intelligently. If your locker meets full traction on a big rock and just doesn't move forward, don't keep trying. Don't apply all your power.
5) Get low gearing (crawler or 4.7). Even though it will increase the power you apply to the parts, it will help you drive slower and smoother and therefore break stuff less.

Last edited by beefyjw; 09-05-2013 at 08:29 PM.
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Old 10-07-2015, 10:55 PM #23
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An old thread but I'm bumping it for great info on IFS and lockers.
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Old 03-07-2017, 01:09 PM #24
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Inaccurate info in the first post, IMHO. While IFS does have issues with weak CVs, there is no reason not to run a locker if you have any semblance of knowing how to wheel your rig and keep it together.

In fact. I would argue that most fully locked IFS rigs have half the breakage of those just locked in the rear... The lockers allow you to crawl most obstacles and go much slower and controlled (the fast as necessary ends up being not very fast) . Shock loads break parts, period.... Have you watched the stress that brake activated limited slip (like ATRAC) can put on the CVs...?

Even the old first gen 4runners do pretty good with IFS and lockers. The CVs in those old trucks are weak, but the rest of it holds together pretty good since they are so light. I have friends who beat the heck out of their first gens with lockers. CVs break here and there and are clearly the weak link, but besides that they work. Same with all the other generations.

The 4th and 5th gens have an 8" ring gear that is pretty stout.. It compares well with the high pinion 8" from the 80 series although obviously not in a solid axle housing. I think the carrier barring is actually the same.
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Old 07-13-2017, 12:13 PM #25
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totally agree, a good read
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Old 09-03-2017, 07:25 PM #26
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Quote:
Originally Posted by fourwd1 View Post
There you go, Toyotas are better than your average vehicle.
Hell yes

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Old 09-09-2019, 10:10 AM #27
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Ifs

Great Wright up Jarred!
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