How to ID if rear diff is limited slip???? - Pirate4x4.Com : 4x4 and Off-Road Forum

BrandonV · 05-26-2003, 08:39 AM

I am going to change the fluid on my 95 YJ 4-cyl. How can I tell if the rear diff is L/S and needs friction modifier?
I dont see any tags on the case, how about the bolt pattern or ??????
Thanks!

TxScout · 05-26-2003, 08:51 AM

LS cases are more "square", while open cases have a slight curve inwards when going away from the ring gear. So if you're looking at your diff, look from the ring gear to the right. Does the case curve or is it straight?

BrandonV · 05-26-2003, 09:16 AM

Thanks for the reply.
I'm having doubts about what I think it is, could you take a look at these pics I took and tell me if you can tell for sure?
I dont want screw this thing up.

http://www.ofoto.com/BrowsePhotos.js...4159803&page=1

click on thumbnail for larger view.

kwrangln · 05-26-2003, 09:37 AM

You have to remove the cover to see the carrier. No real way to tell untill you do. I'm pretty sure that 4 bangers didnt have a limited slip as an option.

kwrangln · 05-26-2003, 09:44 AM

An open differential will look like this.

BrandonV · 05-26-2003, 09:49 AM

Ah crap!
I dont have time to do that, I need to use it today and dont have time to let a silcone gasket cure. There's no way to tell from jacking it up and spinning the tire?
BTW, last winter I noticed that going uphill only one tire would get power and it never transferred power to more than one rear wheel in 2WD.
I dont think it has it either but I dont want to burn the clutches if it does.
Thanks for your help!

kwrangln · 05-26-2003, 09:55 AM

If it has a limited slip, its a tracklock, commonly refered to as a trashlock. It doesnt take many miles to turn this limited slip into an unlimited slip. I wouldnt worry about it. How the hell are ya draining the fluid to change it if your not pulling the cover off? Pumping it out? Its always a good idea to pull the cover to see what kind of crap you have floating around in there, especially with the dana 35 rear end.

If your really worried about it then go ahead and put the modifier in, it wont hurt anything if you do have a standard open diff.

goatman21 · 05-26-2003, 11:11 AM

Even if it is an open diff it will not hurt anything if you put the additive in it. If you're not sure, go ahead and put it in just to be safe.

nathon001 · 05-26-2003, 09:16 PM

I have a factory "Trashlock" in a ff d60. When both tires are off the ground spend the wheels. If the tires spin in that same direction you have a limited slip. If they turn in opposite directions you have an open dif.

SilverZuk · 05-27-2003, 07:34 AM

Quote:

Originally posted by nathon001
I have a factory "Trashlock" in a ff d60. When both tires are off the ground spend the wheels. If the tires spin in that same direction you have a limited slip. If they turn in opposite directions you have an open dif.

This guy has the answer!
You jack up both wheels, and spin one with your hand.
If they both spin the same direction it has some sort of traction aid (limited slip, locker, etc.)
If the tires spin opposite directions, it’s an open dif.

apeters89 · 05-27-2003, 05:36 PM

Quote:

Originally posted by SilverZuk

This guy has the answer!
You jack up both wheels, and spin one with your hand.
If they both spin the same direction it has some sort of traction aid (limited slip, locker, etc.)
If the tires spin opposite directions, it’s an open dif.

Just make sure you leave your tranny in neutral when doing this. Otherwise you won't be able to tell.

NOODLES · 05-27-2003, 10:55 PM

just put 1 side of the axle on a jack stand and try to drive off it in 2wd. if it pulls it's got a ls. god it's hard to type while holding a 6 month old

P&T Jeeps · 05-28-2003, 07:22 AM

BTW, the silcone needs maybe 2 minutes to cure, if that. slap on the goo, bolt it up, and fill away....

nathon001 · 05-28-2003, 07:53 AM

Quote:

just put 1 side of the axle on a jack stand and try to drive off it in 2wd. if it pulls it's got a ls. god it's hard to type while holding a 6 month old

AMEN brother!! Mine is six months old today. Does your six month old start pounding on the keyboard if you blink to long?

NOODLES · 05-28-2003, 03:45 PM

don't get me started.

05-26-2003, 08:39 AM	#1 (permalink)
BrandonV Registered User Join Date: May 2003 Member # 19901 Location: Belmont Shore, CA Posts: 3	How to ID if rear diff is limited slip???? I am going to change the fluid on my 95 YJ 4-cyl. How can I tell if the rear diff is L/S and needs friction modifier? I dont see any tags on the case, how about the bolt pattern or ?????? Thanks!

05-26-2003, 08:51 AM	#2 (permalink)
TxScout Registered User Join Date: Mar 2002 Member # 10416 Location: Austin, Tx...yall Posts: 432	LS cases are more "square", while open cases have a slight curve inwards when going away from the ring gear. So if you're looking at your diff, look from the ring gear to the right. Does the case curve or is it straight? __________________ [URL=http://www.longhornoffroad.com/]Longhorn Offroad[/URL] 76/79 scout II, one ton axles on the way!!! "Some people spend thousands on psychiatrists, I beat shit with a hammer" --Jesse James' Monster Garage [QUOTE][i]Originally posted by Overbear [/i] [B]2) I think we can all say doug is clearly a darwin award canadate. Let us all hope he gets his place in them soon before he reproduces.[/B][/QUOTE]

05-26-2003, 09:37 AM	#4 (permalink)
kwrangln Doublewide engineer Join Date: Sep 2001 Member # 6971 Location: Gulf coast Posts: 5,904	You have to remove the cover to see the carrier. No real way to tell untill you do. I'm pretty sure that 4 bangers didnt have a limited slip as an option. __________________ I'm the "tack tack tack" welding nazi. http://www.pirate4x4.com/forum/showp...&postcount=218 "I didn't mean to kill nobody ... I just meant to shoot the sonofabitch in the head. Him dying was between him and the Lord." R. L. Burnside

05-26-2003, 09:44 AM	#5 (permalink)
kwrangln Doublewide engineer Join Date: Sep 2001 Member # 6971 Location: Gulf coast Posts: 5,904	An open differential will look like this. __________________ I'm the "tack tack tack" welding nazi. http://www.pirate4x4.com/forum/showp...&postcount=218 "I didn't mean to kill nobody ... I just meant to shoot the sonofabitch in the head. Him dying was between him and the Lord." R. L. Burnside

05-26-2003, 09:55 AM	#7 (permalink)
kwrangln Doublewide engineer Join Date: Sep 2001 Member # 6971 Location: Gulf coast Posts: 5,904	If it has a limited slip, its a tracklock, commonly refered to as a trashlock. It doesnt take many miles to turn this limited slip into an unlimited slip. I wouldnt worry about it. How the hell are ya draining the fluid to change it if your not pulling the cover off? Pumping it out? Its always a good idea to pull the cover to see what kind of crap you have floating around in there, especially with the dana 35 rear end. If your really worried about it then go ahead and put the modifier in, it wont hurt anything if you do have a standard open diff. __________________ I'm the "tack tack tack" welding nazi. http://www.pirate4x4.com/forum/showp...&postcount=218 "I didn't mean to kill nobody ... I just meant to shoot the sonofabitch in the head. Him dying was between him and the Lord." R. L. Burnside

05-26-2003, 09:16 AM	#3 (permalink)
BrandonV Registered User Join Date: May 2003 Member # 19901 Location: Belmont Shore, CA Posts: 3	Thanks for the reply. I'm having doubts about what I think it is, could you take a look at these pics I took and tell me if you can tell for sure? I dont want screw this thing up. http://www.ofoto.com/BrowsePhotos.js...4159803&page=1 click on thumbnail for larger view.

05-26-2003, 09:49 AM	#6 (permalink)
BrandonV Registered User Join Date: May 2003 Member # 19901 Location: Belmont Shore, CA Posts: 3	Ah crap! I dont have time to do that, I need to use it today and dont have time to let a silcone gasket cure. There's no way to tell from jacking it up and spinning the tire? BTW, last winter I noticed that going uphill only one tire would get power and it never transferred power to more than one rear wheel in 2WD. I dont think it has it either but I dont want to burn the clutches if it does. Thanks for your help!

05-26-2003, 11:11 AM	#8 (permalink)
goatman21 Registered User Join Date: May 2003 Member # 19839 Location: Seattle Posts: 66	Even if it is an open diff it will not hurt anything if you put the additive in it. If you're not sure, go ahead and put it in just to be safe.

05-26-2003, 09:16 PM	#9 (permalink)
nathon001 Wheeler Join Date: Mar 2003 Member # 18209 Location: lafayette, louisiana Posts: 285	I have a factory "Trashlock" in a ff d60. When both tires are off the ground spend the wheels. If the tires spin in that same direction you have a limited slip. If they turn in opposite directions you have an open dif.

05-27-2003, 10:55 PM	#12 (permalink)
NOODLES Registered User Join Date: Feb 2001 Member # 3132 Location: I love jews Posts: 4,891	just put 1 side of the axle on a jack stand and try to drive off it in 2wd. if it pulls it's got a ls. god it's hard to type while holding a 6 month old

05-28-2003, 07:22 AM	#13 (permalink)
P&T Jeeps Granite Guru Join Date: Mar 2001 Member # 3916 Location: south Posts: 2,826	BTW, the silcone needs maybe 2 minutes to cure, if that. slap on the goo, bolt it up, and fill away.... __________________ TJ; ARB'd & ChroMo'd 1-tons; 42" IROK's; Atlas 4.3; 4-linked, 106" WB... The Build

05-28-2003, 03:45 PM	#15 (permalink)
NOODLES Registered User Join Date: Feb 2001 Member # 3132 Location: I love jews Posts: 4,891	don't get me started.

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