Opinions on running a Truetrac? - JeepForum.com
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post #1 of 31 Old 06-03-2020, 07:44 AM Thread Starter
V8FUN
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Opinions on running a Truetrac?

I've been gathering info on lockers and LSD's, and after discussing it with a local Jeep guy I think I'm leaning toward the truetrac in the Ford 9". My intended purpose for the vehicle is mostly street driven with a 5.2 Magnum/AX15 combo. Wheeling would most likely be trails and such, never done any crawling and mudding has been the funnest so far. Clutch type has been the most recommended, but from hotrod people not jeepers. What are the pitfalls of the Truetrac?

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post #2 of 31 Old 06-03-2020, 07:49 AM
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IMO the helical-gear TrueTrac is the only Limited Slip worth the cost. The harder you use a clutch type Limited Slip, the faster the clutches wear out.

The benefits are extra traction with none of the odd behaviors automatic lockers have, and a very long service life.

The only minor "pitfalls" are they cannot provide the same traction improvement as a locker, and eventually after many, many years/miles of usage when it wears out it cannot be rebuilt at home.

One of the guys in my local Jeep Club has TrueTracs front and rear and he has no problems keeping up with the other automatic locker equipped Jeeps.

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post #3 of 31 Old 06-03-2020, 09:19 AM
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LSDs are good in mud and gravel, loose dirt.

Not good in rocks where you have lots of traction. Anywhere you are in a high-traction area where only one wheel is able to spin, the LSD won't help you much.

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post #4 of 31 Old 06-03-2020, 11:34 AM
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They will be infinitely better than an open diff in any offroad scenario and you likely won't even know it's there when on the road. That said, they will let definitely let you down if you start trying to do any real rock crawling. They will limit slip and help turn the other wheel but if you're bound up hard on one wheel like you typically experience when rock crawling, it might as well be an open diff.

Best advice I can give is to know your purpose now and plan for your purpose later. If you're happy doing beginner trails with smaller tires and don't plan on rolling over rocks much larger than a basketball, a limited slip will be perfect. If you start experimenting with that now and are gaining confidence, you're better off with a real locker because you'll outgrow the limited slip.
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post #5 of 31 Old 06-03-2020, 02:18 PM
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Waternut covered the TT pretty well. Had one but found it not applicable to the type of wheeling I do.


Are you planning on a stretch at all ?


Ask because while the Ford 9" can be made into a very robust center it has a very low pinion. This low pinion increases the hypoid angle where the much of the strength comes from. Bad thing in a short wheelbase vehicle is a driveshaft angle that is pretty severe. Tilting the pinion up also compromises the front pinion bearing from being lubed properly.


Personally I`d be a bit uncomfortable running down the highway for any length of time. That pinion bearing isn't going to be happy and trying to eliminate DS vibration might be a task.


YMMV
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post #6 of 31 Old 06-03-2020, 02:24 PM
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For a street/trail combo rig at a reasonable price, the TruTrac is unbeatable. I used them for years until I went full lockers and the guy who bought them from me is still using them. They have over 100k miles on them combined. You will be very happy with TruTracs.

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post #7 of 31 Old 06-03-2020, 04:28 PM Thread Starter
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Right on, sounds like they're a good choice. The local Jeep guy I mentioned has them front and rear in a V8 YJ, and he's pretty happy with them.
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post #8 of 31 Old 06-03-2020, 04:41 PM
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Quote:
Originally Posted by V8FUN View Post
Right on, sounds like they're a good choice. The local Jeep guy I mentioned has them front and rear in a V8 YJ, and he's pretty happy with them.
Sorry going to have to get more information on this.
Is this a daily driver or a toy?
Your profile does not show where you live. Do you have snow?
Not sure of the Truetracs, are they a drop in that you do not have to set anything else up afterword?

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post #9 of 31 Old 06-03-2020, 07:11 PM Thread Starter
V8FUN
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Quote:
Originally Posted by TSEJEEPERS View Post
Sorry going to have to get more information on this.
Is this a daily driver or a toy?
Your profile does not show where you live. Do you have snow?
Not sure of the Truetracs, are they a drop in that you do not have to set anything else up afterword?
It's a toy, but I was driving it almost everyday too. Not sure what you're asking with your last question about afterward, but I'm doing a V8 swap and I'm building the 9" to replace the D35 because of the engine swap. I don't have a plan yet for the front axle, but this will be mostly street driven. We do get snow.
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post #10 of 31 Old 06-04-2020, 04:10 PM
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What "California Foothills"? I'm assuming somewhere down south since you mentioned mud.

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post #11 of 31 Old 06-04-2020, 05:31 PM
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I went with a Locker in the front axle and a Detroit LSD in the rear. My application is most around town driving for fun. 4-6 times a year I drive it up to 10,500 ft where I hunt big game. I need to get there in all weather conditions (Snow, Rain, Mud) and the LSD has better on road characteristics than the locker. I have a CJ so when I get off road I lock the hubs and get the benefit of the locker.

I never rock crawl... Not my cup of tea.


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post #12 of 31 Old 06-04-2020, 08:37 PM Thread Starter
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Originally Posted by timatoe View Post
What "California Foothills"? I'm assuming somewhere down south since you mentioned mud.
Sonora
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post #13 of 31 Old 06-05-2020, 06:40 AM
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Youre building a toy with some HP to play with.


Limited slips suck. There I said it. Some suck more than others. Want fun ? Install a selectable locker.


My comments on using a 9 inch and obviously no stretch isn't what you want to hear. Good luck keeping pinion bearings in it and controlling DS angles/vibrations.
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post #14 of 31 Old 06-05-2020, 09:18 AM
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Quote:
Originally Posted by jsawduste View Post
Youre building a toy with some HP to play with.


Limited slips suck. There I said it. Some suck more than others. Want fun ? Install a selectable locker.


My comments on using a 9 inch and obviously no stretch isn't what you want to hear. Good luck keeping pinion bearings in it and controlling DS angles/vibrations.
This.

I had a ls in my 8.8 and off road it felt open.
Went with selectables and am very satisfied. Even tried automatic lockers for a while, but I live with a snow season and autos and snow are bad.
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post #15 of 31 Old 06-05-2020, 11:43 AM
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Originally Posted by jeepster93 View Post
This.

I had a ls in my 8.8 and off road it felt open.
Went with selectables and am very satisfied. Even tried automatic lockers for a while, but I live with a snow season and autos and snow are bad.
Yeah the only time I ever even know I have an LSD when off-road is when I'm climbing rocks with a gravel layer on top. Both wheels will spin until the gravel is cleared.

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