GM Drivetrain & Suspension Chassis | Transmission| Driveshaft | Gears/Rear End/Differential | Traction Aids

gears and rear end question

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Old Mar 10, 2013 | 03:49 PM
  #11  
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Tru Trac is not a locker....... it's a Torque biasing limited slip. It doesn't "lock up" and it can't "lock up".
yeah, sorry. I was reading the intentions wrong. I saw the "light to light get up" comment and was assuming that you are experiencing one wheel peel, hence the reason I mentioned trutrac to prevent this. If you want a locker for offroading, the Detroit it is. Or you could spend serious money on an ARB setup if you want to go with air actuated.

As for 4.56's, it depends how much you drive the truck on the highway IMO. You will be turning some serious RPM's at highway speeds with 4.56's. However, from a dig at a stop light you will like it...
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Old Mar 10, 2013 | 04:01 PM
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Again... my truck is not an extreme off roader... unless maybe you consider about 5% gravel roads and the rest highway extreme. Its a stock height stocks tire size pickup with wrangler silent armors on it... yep pretty hardcore. Have you ever owned a detroit? Probably not.... There is nothing hardcore or extreme about a detroit locker other than the b.s. I read on these forums.

You do realize that even with 4.56s and a 34 " tall tire that his cruise at 70 mph will be around the 2200 rpm on the highway.... 2208 to be exact. That seems pretty reasonable to me.
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Old Mar 10, 2013 | 04:28 PM
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Ahhh, wow. I'm not sure at what point I said any of your statements were hardcore and that you had or were referring to an extreme off roading machine. so, let's start with you backing off my *** a bit. I'm trying to help the OP, and giving him my real world advice. I've had detroit lockers and ARB lockers on my rigs before as well as trutrac. So settle down a bit Francis.

Having said that, running 2200 rpms at 70 on the highway is a lot of rpm's for a V8 if you want decent gas mileage. Depending on where the op lives, 70 might be the speed limit, so 75 would be average on the highway. My point was that this will eat gas for sure if they drive a decent amount each and every day to work, period. That's all, nothing more nothing less than that.

I'm not here to argue with you. I'm here to help out the OP.
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Old Mar 10, 2013 | 06:32 PM
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Don't think improving gas mileage is top priority here...... But then a lifted larger tire truck with a cam and convertor in it's future are not mileage conscience either. Maintaining would be a better statement. Going to 4.56 from 3.73 will improve it by allowing it to not work so hard...... That and it really will just bring his rpm back closer to what it would have been rocking the stock 245's.

I don't care much to argue but your opinion on a Detroit seems a little skewed, like most of the internet forums I visit. But it is your opinion and if you actually have real world experience and don't just say it as a rebuttle so be it. Agree to disagree.
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Old Mar 10, 2013 | 07:02 PM
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No worries man. Like I said, I'm not here to argue with you, just trying to help the OP. Not sure what's skewed by my opinion. There are many types of "Detroit lockers" out there, so I'm just trying to help them understand a bit. Just throwing around the word locker may confuse some folks as you are eluding to that you have seen elsewhere. Again, I was thinking he wanted more of a LSD by his stoplight comment. For offroading more than not, I would choose a full locker.

there are detroit lockers that lock fully and there is a Detroit Locker trutrac. All use the same nomenclature in the title so that's probably why you see so much misinformation out there. Here's a link that may help the OP:

Detroit Locker - Lockers, Spools And Limited Slips

As for the gears, again, I think we need to know what kind of driving they are going to do "Most" of the time. yes, the gears will help move the weight of the tires and not burden the engine as much, but 4.11's is no slouch for a gear choice. Hell, every lifted Titan out there running 35's+ are almost all running the big tow gears from the factory which are 3.36. granted, Titans are torque monsters, but still. Cheers mate, it's all in the name of knowledge.
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Old Mar 10, 2013 | 07:20 PM
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Originally Posted by tights24
No worries man. Like I said, I'm not here to argue with you, just trying to help the OP. Not sure what's skewed by my opinion. There are many types of "Detroit lockers" out there, so I'm just trying to help them understand a bit. Just throwing around the word locker may confuse some folks as you are eluding to that you have seen elsewhere. Again, I was thinking he wanted more of a LSD by his stoplight comment. For offroading more than not, I would choose a full locker.

there are detroit lockers that lock fully and there is a Detroit Locker trutrac. All use the same nomenclature in the title so that's probably why you see so much misinformation out there. Here's a link that may help the OP:

Detroit Locker - Lockers, Spools And Limited Slips

As for the gears, again, I think we need to know what kind of driving they are going to do "Most" of the time. yes, the gears will help move the weight of the tires and not burden the engine as much, but 4.11's is no slouch for a gear choice. Hell, every lifted Titan out there running 35's+ are almost all running the big tow gears from the factory which are 3.36. granted, Titans are torque monsters, but still. Cheers mate, it's all in the name of knowledge.
Funny you mention a Titan...... I had a 2010 Pro4x King cab for a while. The locker only working in 4 lo was to be my first mod but it had something wrong with it. It drove like a boat that wallowed going down the highway and the dealer, although helpful and trying couldn't do diddly about it. So I sold it about 3 months into it ( bought low mile used, sold low mile used, lol). That said even with the stock 275/70/18's I wanted more gear in that truck..... like 3.73 would be ideal as the 3.36's it had did little for me. And like you said, that 5.6 has an abundance of torque which honestly a 5.3 can't touch.

I think that is just 4 wheel parts screwing around the name on the Trutrac. The description is still the same being a torque biasing limited slip but they added the "locker" thing in the name by mistake. This is Eatons factory documentation on what they build.

Differentials

No mention of a locking tru trac lol.

I am sure the OP will be satisfied regardless of which way he goes.
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Old Mar 10, 2013 | 07:37 PM
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Hahaha, I had the 2.94's in mine. Talk about wanting more gear!!! But hey, when I'm doing 75mph down the highway at 1700 rpm's and getting 20mpg on long trips, who am I to argue. yeah, every Titan owner would have loved even a 3.73 option including myself. The link I provided was more for the descriptions/bullets of each they list, not the naming convention, and you're right, the OP will be good with either. Plus, he'll have that "deer in headlight" look we've all had when you get on the feeder at a stop light when making a turn and are now facing the traffic that was behind you on your first day with trutrac.... Teehee.

It stink you had problems with the Titan. not much can beat them for stoplight racing stock for stock. You would need to mod most other trucks pretty good for them to hang with a Titan almost to an 1/8 mile. After that though they fall off quick. Again, cheers, and hopefully the OP gained something from our discussion.
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Old Mar 10, 2013 | 07:46 PM
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Originally Posted by tights24
Again, cheers, and hopefully the OP gained something from our discussion.
Probably not other than mass confusion, lol LOL. I hold nothing against Nissan ( pushed my girlfriend to get a 2012 Maxima and my friends 07 Titan is flawless) but the mod bug hits hard too. Not too many turbo equipped Titans running around and keeping a transmission, lol.
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Old Mar 10, 2013 | 07:58 PM
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Not too many turbo equipped Titans running around and keeping a transmission, lol.
nope, just ask toomnymods. I'm pretty sure he just gave up on his and is potentially going with a 4.8 and boosting it in a different truck. He's the one that sent me here when I wanted to try to get this "new to me" Yukon out of its own way. Lots of info here.

The Maximas are nice rides. My wife had a 2001. I had a 2012 rental the end of last year and took it to the track. The thing was a complete base model rental with skinny tires and it ran a 14.4 just getting up there and mashing it. I was spinning through the 60ft mark too.
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Old Mar 10, 2013 | 09:08 PM
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Originally Posted by tights24
nope, just ask toomnymods. I'm pretty sure he just gave up on his and is potentially going with a 4.8 and boosting it in a different truck. He's the one that sent me here when I wanted to try to get this "new to me" Yukon out of its own way. Lots of info here.

The Maximas are nice rides. My wife had a 2001. I had a 2012 rental the end of last year and took it to the track. The thing was a complete base model rental with skinny tires and it ran a 14.4 just getting up there and mashing it. I was spinning through the 60ft mark too.
Yeah hers is an SV which acts as base model in Canada. It's still sunroof, heated leather, heated steering wheel etc. My GTP runs mid to low 14's, traction dependent and I may be able to pull on that stock Maxima but only slightly. Not bad for what oddly enough, was an ex rental car, lol.
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