But only tears the grass up when turning in 4x4 correct?
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Gear change and Spartan Locker Install
- Thread starter lonesouth
- Start date
But only tears the grass up when turning in 4x4 correct?
Sorry I was thinking the Spartan was on the front axle.
Okay I don't feel so bad then lol. I don't have any experience with one on the rear, but would assume it would be like a full Detroit, which I have, and it does shred the yard and gravel when I turn.
Nothing Special
Sr. Member
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- Nov 25, 2016
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Both Spartans and Detroits, as well as all other automatic lockers I'm aware of, unlock very easily and will not tear up grass in turns unless you apply too much throttle and spin the inside rear tire. The problem is that it's really hard not to apply too much throttle and spin the inside tire, so people often think it's that the locker didn't unlock correctly.
When you go around a corner and the outside tire tries to turn faster than the inside one. An automatic locker will freely let the outside tire go faster than the ring gear, but it won't let the inside tire go slower, so when it unlocks it stops driving the outside tire and you now have one wheel drive. With all of the power going to the inside tire (that might even be loaded more lightly if you're going fast enough to cause weight transfer to the outside), it's very easy to spin that inside tire. Once it spins fast enough to catch up to the outside tire the locker will relock and you'll have 2 wheel drive again. But it is easy to spin a tire in a turn with a locker, especially if it's slippery.
When you go around a corner and the outside tire tries to turn faster than the inside one. An automatic locker will freely let the outside tire go faster than the ring gear, but it won't let the inside tire go slower, so when it unlocks it stops driving the outside tire and you now have one wheel drive. With all of the power going to the inside tire (that might even be loaded more lightly if you're going fast enough to cause weight transfer to the outside), it's very easy to spin that inside tire. Once it spins fast enough to catch up to the outside tire the locker will relock and you'll have 2 wheel drive again. But it is easy to spin a tire in a turn with a locker, especially if it's slippery.
- Joined
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Friend had 37's on his EB for awhile with a full spool. Man, that thing would scare the women-folk and send the kids running just going around a gentle curve in town.
I think my Detroit in the rear is pretty loose. I can just "feel" it, but never get any of the chirping and other inputs I would expect on the pavement. And I can turn really tight with the 31's and no steering stops!
Might still tear up the lawn though.
I wonder if the smaller tires are less likely to make that an issue? They still wear well on the rear too.
Paul
I think my Detroit in the rear is pretty loose. I can just "feel" it, but never get any of the chirping and other inputs I would expect on the pavement. And I can turn really tight with the 31's and no steering stops!
Might still tear up the lawn though.
I wonder if the smaller tires are less likely to make that an issue? They still wear well on the rear too.
Paul
Nothing Special
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I've put a lot of street miles on automatic lockers, a Detroit in a CJ5, a LockRight in an F-150 and a Detroit in my Bronco. I really don't mind them on the street (and I MUCH prefer them to factory limited slips on snow or ice). But I'm also the first to admit they aren't for everybody and they aren't the greatest on the street.
In the three vehicles I've had rear lockers in I really valued the positive performance off road (rock crawling in the Jeep and Bronco, muddy or snowy forest roads grouse hunting in the F-150). Given that I valued that was willing to put up with the quirks on the street. In the little CJ it was very annoying (even non-car-people passengers would notice and ask what was wrong with it). In the bigger F-150 it was barely noticeable. In the mid-size Bronco I notice it every time I drive it, but passengers usually don't comment.
The biggest issue is the one wheel drive in corners that I mentioned above. You squawk tires a lot. Also the torque steer is pretty noticeable (really bad in a little CJ5). But on the plus side, they unlock freely (yes, even when you're on the gas), so they don't tend to scuff tires like factory limited slips do. An automatic locker will spin you out in a heartbeat if you get on the gas too hard on ice or snow, but a factory limited slip will spin you out even if you aren't on the gas.
A TrueTrac is a much better option for a mostly street-driven vehicle. That's what I'd have put in my F-150 except for the cost. They are said to be almost as good as a locker unless you are lifting tires (a locker is a lot better then). And they have almost no bad manners on the street (although they will spin you out if you get on the gas too hard).
In the three vehicles I've had rear lockers in I really valued the positive performance off road (rock crawling in the Jeep and Bronco, muddy or snowy forest roads grouse hunting in the F-150). Given that I valued that was willing to put up with the quirks on the street. In the little CJ it was very annoying (even non-car-people passengers would notice and ask what was wrong with it). In the bigger F-150 it was barely noticeable. In the mid-size Bronco I notice it every time I drive it, but passengers usually don't comment.
The biggest issue is the one wheel drive in corners that I mentioned above. You squawk tires a lot. Also the torque steer is pretty noticeable (really bad in a little CJ5). But on the plus side, they unlock freely (yes, even when you're on the gas), so they don't tend to scuff tires like factory limited slips do. An automatic locker will spin you out in a heartbeat if you get on the gas too hard on ice or snow, but a factory limited slip will spin you out even if you aren't on the gas.
A TrueTrac is a much better option for a mostly street-driven vehicle. That's what I'd have put in my F-150 except for the cost. They are said to be almost as good as a locker unless you are lifting tires (a locker is a lot better then). And they have almost no bad manners on the street (although they will spin you out if you get on the gas too hard).
metal1
Jr. Member
now that you have a pretty good handle on rebuilding the rear 9" why not rebuild the limited slip that was in one of the diffs you have, I found the clutches and steels with the shim kit on e bay ,I did mine and really like the traction it gives me ,rarely see snow and maybe wet dirt but it gets thru the dirt and sand and rocks out here in the calif desert 
OP
OP
- Joined
- Dec 18, 2003
- Messages
- 5,045
After doing some more reading, specifically the below site, I may take a crack at rebuilding my factory limited slip. Doubtful I will ever put 30k miles on this bronco, so it could be good for the life of the bronco henceforth.
http://www.hotrod.com/articles/ford-9-inch-rebuild-for-pennies-on-the-dollar/
http://www.hotrod.com/articles/ford-9-inch-rebuild-for-pennies-on-the-dollar/
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I used that article to help rebuild my factory posi and it wasn't a bad job. Them old factory posi units were a pretty good setup.Ken Oh yeah. that posi additive that you soak the clutches in sure does stink
