October 22nd, 2001, 15:30
I am planning on putting a locker in my 9" and I was curious as to what types of lockers people might recommend and also why they recommend them? Thanks
October 22nd, 2001 15:30
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October 22nd, 2001, 15:36
I have a Detroit Locker in my ford 9" on my suburban. Works great but on the street its gets kind of tricky around corners. You have to coast around corners or else the locker will engage and your tires will start chirping.
October 22nd, 2001, 17:04
I don't know what you know about lockers, so I'll be basic. A locker will lock both axles in the differential, and keep them locked, except around corners where the centrifical force pulls them out. The force of the outer wheel pulls it out. I prefer a posi, which is based on clutches. When it senses a load, it hooks up, otherwise it stays open. I have a Eaton Posi in my GM 14 bolt SF on my Z71, and I love it. I would think the offroad racing guys would all like lockers, for street use, and some dirt, stick with a posi, less noise, less hassle, less CLANK, CLANK, CLANK. I think Eaton makes one for a Ford 9", I would also look into Auburn. For a locker, Detroit is my fav.
October 22nd, 2001, 18:25
In my humble opinion... a POSI is worthless in many off-road scenarios. It's better than nothing and has excellent street manners, I'll give the POSI that. I've put over 100,000 miles on locker equipped 2wd trucks and wouldn't trade a locker for a posi in any condition, including snow and ice. A posi doesn't do any good when one tire has traction and the other doesn't - it'll still let the tire with the least amount of traction spin... a locker will always (unless it grenades) distribute torque to both wheels when you need it. You'll never have to worry about clutches, friction modifiers, or the quirkiness of a POSI. I say the POSI is quirky because you never know just how it's going to react when the wheels start to spin or slip, with a locker you can bet your butt it'll behave the same way every time. If you plan on driving the vehicle off-road at all, even once a year, I'd say go with a locker. I've decided my Bronco project needs a full-spool in the rear - it's cheaper than a Detroit and stupid reliable. I'd even argue that spools make fine additions to street driven vehicles - if you like that "I don't wanna turn" feeling.
Go for the locker, it'll let a 2wd vehicle keep up with most wussy 4wd guys. I agree, the Detroit is the way to go. ARB lockers leak and are expensive, the new OX Trax cable activated dealy-whomper is a great idea but hasn't really been proven yet - and I don't think they have a 9" version yet.
October 22nd, 2001, 18:56
In this months issue of 5.0 mustang mag they discuss all the different posi's and lockers. I know its not a truck mag but the info is current and still applies to what we do.
October 22nd, 2001, 21:33
For street manners you can not beat the Tru-Trac. It is a gear based, as opposed to clutch based posi. It works on the principle that a worm gear can easily drive a spur gear, but a spur gear can not easily turn a worm gear. The gear arrangment is such that it actually senses which tire has more traction (up to a point anyway) and gives that tire more power. This was all worked out by a very smart fellow by the name of Weisman in the late 60's. He built Can-Am transaxles that lived when all of the other so-called experts couldn't build a part to take the 1000 HP they were making even back then. The closest diff to his design out there is the Quaiffe. Bring cubic dollars for one of those. The Tru-Trac gives up some of the inate ability to make it economic to produce.
They will spin a tire if you get one totally in the air. The simple cure is to tap the brakes, that will lock the unit up. They are not as strong as a spool or a Detroit so if you're talking a lot of HP or weight, I wouldn't consider it.
My Xcab Yota (112" WB) came to me with a Detroit in the rear. It does take some getting used to it to drive, but it's not intolerable or spooky. The biggest thing about Detroits is that they do not like to have different tire diameters on each end. I can tell when rear tire pressures differ by 2-3 pounds. I put air chucks on each end of a self coiling hose to equalize air pressure. A Detroit's bad manners will really show up in a short WB like a CJ. Yuck.
"Teach you all I know and you're still stupid"
-- Howdy Lee
October 22nd, 2001, 23:11
I, too, am considering a locker on my 2wd, daily driven, prerunner wannabe. However, I've heard rumours that driving on ice or snow with a rear locker can be dangerous. Is this true? I live in the Dallas, Texas area where it doesn't snow much at all. However, we get ice storms on occasion during the winter, which leave the roads dangerously icy at times. I would like the simplicity and affordability of a full-time locker like a Detroit, but am wondering whether a part-time locker like an ARB would be more prudent for the winter driving. Any advice?
October 22nd, 2001, 23:44
go with a tru trac. i am in the mountains with my prerunner often, and the tru trac has never been anything but predictable. and in the sand, its just like a locker.
October 23rd, 2001, 08:59
I lived in South Lake Tahoe for almost two years. The first week I moved up there all the "locals" laughed when they saw my SO CAL S-10. They laughed that I lifted my 2wd truck, ahahahahah they said. When I told the local parts house guy that I had a locker he laughed, "you put a Ford 9" in a Chevy? ahahahaha he said, "you'll never be able to go ANYWHERE in 2wd, and a locker'll just make it worse... ahahahhahah - I tried to explain that I grew up in Arrowhead in Southern California, a mini-Tahoe in my mind, and that I had driven in snow before... I kept getting the same reaction - ahahahah a 2wd lifted truck and the owners from SO CAL... ahahahah --- Even people at the grocery store laughed at me.
Well I chained up twice in Tahoe in two years, once because I had to, the other because CHP said he'd ticket me if I didn't. I drove through all sorts of chain checkpoints, the CHP dudes thought my S-10 was 4wd... cuz it looked like a 4wd. I plowed through feet of snow in my locked up 2wd truck. I'd shovel a pickup beds worth of snow for weight and be done with it. I ran 31" BFG muds, another thing people laughed at, "BFG MUD TIRES ARE TERRIBLE IN SNOW AND ICE" Well I hauled ass around Tahoe and motored up and down the mountains without fuss. Yeah, if you want to do doughnuts or pitch the truck around the locker will definitely make that easier. Sure, if you don't know what your doing behind the wheel it'll make you more likely to park it in the berm. Once you "learn the ways of the locker" you'll be fine. I pulled taxi cabs out of the snow, all of them amazed that my truck was 2wd. The parts house guys? I showed up there one day getting parts for my girlfriends car in two feet of snow... no chains, studs, cables, spike spiders... just some weight and a locker. The look on their faces made the trip worth it.
Everyone knocks lockers and spools in snow and ice - few have ever tried it for themselves. Screw them. Oh yeah, when it's time to chain up - you only have to chain one wheel if you're lazy.
I'll add this for the 4wd guys... yes, 4wd is better in the snow than 2wd.
October 23rd, 2001, 09:33
Thanks for the info, Erik. I don't know if Tru Trac offers a posi for my Tacoma prerunner, but it's something I could look into as I consider what to do.