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Old 10-11-2017, 07:17 PM   #1
dcaven
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Default Detroits

After switing to a CDL transfer case in my 03 Discovery, I am looking at a Detroit locker rear and a Detroit truetrac front. I'm building an expedition type vehicle which has a 2" OME lift and larger than stock but not huge tires. What I'm looking for is for someone to share with me what to expect in terms of performance improvement. They are an expensive upgrade and I'm eager to hear the improvement is dramatic. I've looked online but haven't seen anyone describe the difference on say a scale of 1-10 between Detroit's and stock. Subjective, I know, but would like to get a better sense of people's feelings about them. Thanks.
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Old 10-11-2017, 07:22 PM   #2
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Default Re: Detroits

There's lots of threads going into pros/cons of Detroits, ARB, Ashcroft lockers.
Detroit is nice because its simple and just plain works. Downside is you can't turn it off in sideslope and slippery situations.

Theoretically you'd have a source of on board air on an expedition truck so that shouldn't be a reason for not getting an air locker.
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Old 10-11-2017, 07:38 PM   #3
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Default Re: Detroits

Thank you. I think I understand the pros and cons from a technical perspective. My question really is am I going to be blown away by the performance improvement versus what I have now? Maybe no way to get a good answer as people's use for their vehicles differ dramatically and experiences vary quite a bit. I'm choking a little on the cost and am trying to decide if the performance gains justify it.
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Old 10-11-2017, 07:59 PM   #4
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Default Re: Detroits

Quote:
Originally Posted by dcaven View Post
Thank you. I think I understand the pros and cons from a technical perspective. My question really is am I going to be blown away by the performance improvement versus what I have now? Maybe no way to get a good answer as people's use for their vehicles differ dramatically and experiences vary quite a bit. I'm choking a little on the cost and am trying to decide if the performance gains justify it.
I badly regretted not using up that 3rd member with a Detroit on Rubicon. Especially when the CV joint blew.
That said... I might have badly regretted using this Detroit on the way to and from Rubicon.
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Old 10-11-2017, 08:18 PM   #5
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Default Re: Detroits

Sorry to hear about your bad Rubicon experience.
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Old 10-11-2017, 09:34 PM   #6
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Default Re: Detroits

It all depends the kind of trails you're going to travel - forest roads or off road parks or somewhere in between? Sliders and diff guards should be on the to-do list well ahead of lockers regardless of the terrain
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Old 10-11-2017, 10:15 PM   #7
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Default Re: Detroits

I drove my D1 with Detroit rear / TT front 3000 miles from IL to and through Colorado, then back. Never knew they were there except the lack of wheel spin on the trails.
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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 10-11-2017, 10:33 PM   #8
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Default Re: Detroits

Thanks. That is the kind of information I am looking for. I hope to see a big difference off road but very little on.
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Old 10-12-2017, 07:13 AM   #9
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Default Re: Detroits

On road, the steering wheel returns to center much quicker with the TT up front which takes a little getting used to. Heard the clicking from the Detroit in the rear once in a blue moon only when backing up and turning sharply
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Old 10-12-2017, 09:27 AM   #10
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Default Re: Detroits

I just recently installed F+R air lockers and regeared to 4.11's.. Its a game changer for sure off road! The gearing is what is really noticeable, both on and off highway.

Remember that the TT is a limited slip and not a true "locker" such as a Detroit or air locker. So performance offroad is slightly better, but not as good as true locker.
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Old 10-12-2017, 09:33 AM   #11
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Default Re: Detroits

Have the 4.11's crushed your gas mileage? I understand that is a relative question as Discoveries really like gas anyway. Just curious.
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Old 10-12-2017, 10:21 AM   #12
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Default Re: Detroits

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Have the 4.11's crushed your gas mileage? I understand that is a relative question as Discoveries really like gas anyway. Just curious.
I'm running 34's going to 35's so the gearing was needed. I'm currently running at 2200-2400 rpm at 65ish mph where as on stock gearing I was at 1800 rpm at the same speeds. So yeah gas mileage has suffered a bit, but I only really drive the truck to and from the trails. Its not my daily driver.
The biggest thing with the gearing on the highway is the trans isn't searching for gears while climbing hills. Off road 1st gear low range is truly a crawl gear now.
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Old 10-12-2017, 12:10 PM   #13
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Default Re: Detroits

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Originally Posted by dcaven View Post
Sorry to hear about your bad Rubicon experience.
Why bad? It was awesome! With the rear Detroit it might have been way too easy.
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Old 10-12-2017, 01:58 PM   #14
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Default Re: Detroits

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Why bad? It was awesome! With the rear Detroit it might have been way too easy.
That's actually a good point. I went selectable lockers on my other truck because I wanted a challenge, along with other reasons. My truck was setup with 35's and long travel suspension so it was more fun to climb obstacles without lockers.
But on the other hand I was very happy to have a Detroit in CO. I was driving a new to me 94 D1 Manual trans. My skills with a manual were a little rusty and I was glad I didn't have to think about turning lockers on/off, or losing traction/momentum on a steep hill or tight turn, then trying to turn the locker on, then restarting.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 10-12-2017, 02:13 PM   #15
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Default Re: Detroits

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But on the other hand I was very happy to have a Detroit in CO. I was driving a new to me 94 D1 Manual trans. My skills with a manual were a little rusty and I was glad I didn't have to think about turning lockers on/off, or losing traction/momentum on a steep hill or tight turn, then trying to turn the locker on, then restarting.
My Rubicon observation of several dozens of jeeps: most of them run super-low gearing, and either a hand throttle on the stick or simply bumped up idle. They practically don't use gas pedal through most "regular" sections.
You know that probably 90% of the time you run the truck close to 1500 rpm - so setting it to about a thousand by that knob on the throttle cable could have saved you some grief with three pedals.
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Old 10-12-2017, 03:04 PM   #16
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Default Re: Detroits

I gave away a hand throttle about 2 years ago, doh!
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

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No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 10-12-2017, 04:16 PM   #17
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Default Re: Detroits

Quote:
Originally Posted by dcaven View Post
Thanks. That is the kind of information I am looking for. I hope to see a big difference off road but very little on.
If this is your primary goal, get air lockers. They do exactly what you're asking for.

I went with Ashcroft lockers front & rear earlier this year, and at this point, the truck is more capable than I am. (not necessarily a good thing) My experience is that the OE traction control on my D2 did a pretty good job, but in a situation where you've got 1 wheel on each axle slipping, you'll still get stuck, end up rocking back and forth, spinning wheels, etc. I found myself encountering this pretty often, due to a combination of trail difficulty and inexperience. Air lockers make these situations a non-issue.

Naturally, the on-road experience is the same as having open diffs.
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Old 10-12-2017, 06:11 PM   #18
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Default Re: Detroits

I just put 4:11 gears with a TT/Detroit combo in my D90. The only noticeable difference, as noted, is it always wants to return to center and more so than with factory steering geometry. The steering is a little stiffer at speed, but I don't think it is at parking lot speeds.
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Old 10-12-2017, 09:58 PM   #19
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Default Re: Detroits

Ashcroft air lockers are your best bet

if $$$ is a question then a TT/Detriot is a very vialbe option
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Old 10-13-2017, 08:08 AM   #20
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Default Re: Detroits

I have a DetroitLocker/TrueTrac combination on my Disco1. Just fit and forget. I often forget the locker(s) are in place, until someone else with a similar truck has difficulties on obstacles i pass with ease.
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Old 10-14-2017, 08:08 PM   #21
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Default Re: Detroits

If it's primarily an overlander, why not consider a TT/TT combo?
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This state is largely retarded.


1996 Disco I 33s, armor, etc (sold, now on 35s, nasty)
1999 Disco II, stock (sold, now a nice mild build)
2001 Disco II, chopped & caged, 37s, locked (Molly)
2008 L322 (DD)
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Old 10-14-2017, 10:35 PM   #22
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Default Re: Detroits

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If it's primarily an overlander, why not consider a TT/TT combo?
All the hassle and cost of setting up a locker without thw benefits of a real locker(in the rear). No thanks.
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'98 D1 Trail Rig. Lockers and whatnot. Retired
'96 D1 Daily Driver. OME lift, 235/85/16 Toyo AT's.
'95 D1 Project Truck.
'94 D1 Too good to pass up. OME lift, 265/75/16 BFG AT's, Detroit/TruTrac, etc

Quote:
Originally Posted by discostew View Post
No matter how hard you stir it you won't make chocolate ice cream out of a bucket of shit
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Old 10-15-2017, 08:50 AM   #23
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Default Re: Detroits

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Originally Posted by SCSL View Post
If it's primarily an overlander, why not consider a TT/TT combo?
Is there any real downside to the Detroit locker in the rear as opposed to the TT?
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Old 10-15-2017, 09:39 AM   #24
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Default Re: Detroits

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Is there any real downside to the Detroit locker in the rear as opposed to the TT?
Dunno, I have ARBs. And frankly, I haven't witnessed any of the issues frequently attributed to Detroit rears when wheeling with those who have them. But DWeb seems rife with stories of unpredictable behavior on side slope and greasy mud / ice conditions, so I just threw it out there as an option for an overlander vs a dedicated trail truck.
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This state is largely retarded.


1996 Disco I 33s, armor, etc (sold, now on 35s, nasty)
1999 Disco II, stock (sold, now a nice mild build)
2001 Disco II, chopped & caged, 37s, locked (Molly)
2008 L322 (DD)
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Old 10-15-2017, 06:19 PM   #25
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Default Re: Detroits

The only thing that came to mind for me was snow, but I could see you having issues with a TT too.
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