Do I have LSD? - Toyota Nation Forum : Toyota Car and Truck Forums

ABTRD · 02-17-2005, 07:21 PM

I have a 2005 D-Cab Prerunner with a locker, do I have LSD? I know the other truck I was looking at did, but not too sure about mine.

2tacomas · 02-17-2005, 09:15 PM

If you have a locker, you don't have limited slip. It is one or the other w/ the TRD packages. TRD Sport comes w/ the limited slip diff. and TRD Offroad comes w/ the locking rear diff.

ABTRD · 02-17-2005, 10:36 PM

What would you rather have?

2tacomas · 02-17-2005, 11:11 PM

It depends on your offroad/ driving habits. Since you have a PreRunner, you do not have 4wd so it is doubtful that you will be doing a whole lot of serious offroading. I personally prefer (and have) the locking rear- it is very useful when you get really stuck....I am sure that you will use it at one time or another: if you ever drive on soft sand, get stuck in mud, or even in deep snow, the locking rear should help you if your back wheels become stuck/bogged down. It is no substitute for 4wd, but it is a useful feature that can help you get out of a sticky situation.

brad l · 02-18-2005, 01:01 PM

I'm still trying to figure this out too. Toyota has an electric locker and LS. The Tundra has no locker on the TRD package.

I've got a new 05 Tundra 4x4 with the TRD and a LS option. I assume this is a standard LS that is basically a clutch pack in the diff? Lockers aren't really needed for my anyway. I won't be taking the double-cab where it needs lockers. That's what my 1970 Bronco is for!

2tacomas · 02-18-2005, 01:08 PM

I am not 100% sure, but I think that non-TRD model Tundra's do not come standard with a limited slip diff. Everyone I know with Tundra's have the TRD package....so they all have the limited slip diff.

brad l · 02-18-2005, 01:17 PM

Quote:

Originally Posted by 2tacomas

I am not 100% sure, but I think that non-TRD model Tundra's do not come standard with a limited slip diff. Everyone I know with Tundra's have the TRD package....so they all have the limited slip diff.

From what I can figure and from the Toyota web site the TRD off road option has an open diff. on Tundras. All the Tundras I looked at locally had the LS option, even those without TRD. It doesn't look like there is a Tundra "locker" available. The thing I'm trying to figure out is that the 4x2 says it uses a button on the dash to "engage" the limited slip. That sounds like a locker to me.

My Tundra 4x4 came with the TRD off-road package and a LS option but no button on the dash. Is this just a full time LS and is the 4x2 version actually the elctric locker? Man I'm confused.

2tacomas · 02-18-2005, 01:32 PM

There shouldn't be a button to engage the limited slip.....it kicks in automatically. The button on the dash is probably the ETC button that controls the power/normal feature on the tranny (I am assuming the truck is an auto). Tundra's do not come w/ the rear locker option.

brad l · 02-18-2005, 01:37 PM

Quote:

Originally Posted by 2tacomas

There shouldn't be a button to engage the limited slip.....it kicks in automatically. The button on the dash is probably the ETC button that controls the power/normal feature on the tranny (I am assuming the truck is an auto). Tundra's do not come w/ the rear locker option.

OK that makes some sense

Just reading through the owners manual it shows a button on the dash that you use to engage the LS but it says it's only for 4x2's. It says "limited slip" but I can't figure out how you would engage a LS, a locker yes, I can understand that. Maybe I need to reread that owners manual. This doesn't apply to me anyway, it was just a bit confusing. So, what I have is a standard LS with a TRD package. I'll stop worrying about it.

Thanks.

ABTRD · 02-18-2005, 08:56 PM

Let's say you're stuck in mud...and you hit your gear locker, the truck is making progress out of the mud, and the speedo reads 30 mph, but you're not really going 30 mph but the tires are spinning at 30 mph...is that bad?

2tacomas · 02-19-2005, 10:37 AM

The rear locker will only engage when you are at a stop...it takes about 20-30 seconds to actually lock (the rear lock light on your dash will go from blinking to solid when the rear diff. locks). The locker automatically disengages when you hit about 7mph. It will not stay engaged past that....it is a safety feature b/c it would be very hard to controll your truck if the rear was locked and you where doing 30 mph. If you where going that fast (30mph) when you were stuck in deep mud, chances are you would be making the situation worse b/c you would just be bogging down your tires even more....when you really get stuck: stop, put your truck in low, lock the rear diff. and try to crawl out- that should get you out most of the time.

2tacomas · 02-20-2005, 01:28 AM

Quote:

Originally Posted by brad l

From what I can figure and from the Toyota web site the TRD off road option has an open diff. on Tundras. All the Tundras I looked at locally had the LS option, even those without TRD. It doesn't look like there is a Tundra "locker" available. The thing I'm trying to figure out is that the 4x2 says it uses a button on the dash to "engage" the limited slip. That sounds like a locker to me.

My Tundra 4x4 came with the TRD off-road package and a LS option but no button on the dash. Is this just a full time LS and is the 4x2 version actually the elctric locker? Man I'm confused.

I was just looking through my Toyota Owners manual and I did see a section that said some vehicles do have an "AUTO LSD" button on them. The system only works in 2wd and under 62 mph. The manual says "The 'auto lsd' systems aids traction by using the traction control system to control engine performance and braking when one of the rear wheels beigns to spin.
This system is used only when wheel spinning occurs in a ditch or on a slippery or rough surface.
Do not use the 'auto lsd' system in conditions other than above. A much greater steering effort and more careful cornering control will be required." So I guess it is very likely that the 4x2 Tundra you saw did have that button...the system only works in 2wd and I know that you can't get a rear locker on a Tundra-even though that would be nice.

ldivinag · 02-21-2005, 12:38 AM

Quote:

Originally Posted by 2tacomas

I was just looking through my Toyota Owners manual and I did see a section that said some vehicles do have an "AUTO LSD" button on them. The system only works in 2wd and under 62 mph. The manual says "The 'auto lsd' systems aids traction by using the traction control system to control engine performance and braking when one of the rear wheels beigns to spin.
This system is used only when wheel spinning occurs in a ditch or on a slippery or rough surface.
Do not use the 'auto lsd' system in conditions other than above. A much greater steering effort and more careful cornering control will be required." So I guess it is very likely that the 4x2 Tundra you saw did have that button...the system only works in 2wd and I know that you can't get a rear locker on a Tundra-even though that would be nice.

by definition then, that aint an lsD... d=differential

that's just traction control.

ABTRD · 02-21-2005, 02:42 AM

Quote:

Originally Posted by 2tacomas

The rear locker will only engage when you are at a stop...it takes about 20-30 seconds to actually lock (the rear lock light on your dash will go from blinking to solid when the rear diff. locks). The locker automatically disengages when you hit about 7mph. It will not stay engaged past that....it is a safety feature b/c it would be very hard to controll your truck if the rear was locked and you where doing 30 mph. If you where going that fast (30mph) when you were stuck in deep mud, chances are you would be making the situation worse b/c you would just be bogging down your tires even more....when you really get stuck: stop, put your truck in low, lock the rear diff. and try to crawl out- that should get you out most of the time.

I assumed it was still engaged because the light that informs you the locker is engaged was steady and not blinking..

2tacomas · 02-21-2005, 07:43 AM

Quote:

Originally Posted by ldivinag

by definition then, that aint an lsD... d=differential

that's just traction control.

The manual calls it limited slip differential on the caption - I put it in caps in to emphasize it- if you notice the quote I typed out, it is written exactly how the manual has it. I have no idea why it was even in my manual (I have a 2004 Tacoma w/ TRD Offroad- I have a locking rear differential). I just happened to be looking through my manual to see if I could find anything to help out brad l and for whatever reason, it is in the manual for 2004 Tacomas (wierd b/c it wasn't even an option on Tacoma's in the USA during 2004

).