2000 Sport Rear Diff

Rayz2000Sport · August 17, 2008

I have some questions about the rear diff on my 2000 sport.

I recently had some problems with my truck, Possible Transmission Problem, which has brought the diffs on my truck into my attenion.

They (front, back, and the transfer case) seem to have been somewhat neglected by a previous owner and admititedly overlooked by myself.

When I had my issue, I flushed and filled my transfer case, and this seemed to fix the problem. Now I want to due the same with my diffs. My questions are.....

Is my rear diff limited slip?
How easy is it to change my rear gearing/is it something I could easily do while changing the fluid? What kind of benefit would changing the gearing give me?

The rear diff is supposed to be heavy duty synthetic(and be lifetime haha) 90W145? something like that and the front is 80W90 I believe.

Main reason I am trying to make sure I have everything right is that I am going to go with Amsoil gear oil, and at 13.99 per quart I want to make sure I have everything right before I buy anything.

I thank everyone in advance for any advice offered. Thank you and have a great day.

Kyle

gavin · August 17, 2008

re-gearing is spendy... and you would have to re-gear the front and rear.
I think around $500 per axle is about normal? I could be wrong. But I know it's a few hundred. I hope that's what you were asking...
as for benefits to re-gearing? It all depends on how you drive, and what you want. Going to lower gearing will provide for more torque, but you will get a loss in gas mileage.
The main reason people re-gear, is when they go to a larger tire size. By re-gearing, you can get back to being close to the final gear that the OEM offered with original gearing and original tire size.

as for it being limited slip? Can't know for sure. There should be a metal tag on the rear diff. If it has a limited-slip, you will have the code 3L73. L for limited slip, 373 for 3.73:1 gears.

I used mostly 80w90 Royal Purple synthetic gear lube in my diffs. I think I have 1 quart of 75w140, and the rest was 80w90.

Rayz2000Sport · August 17, 2008

gavin said:
re-gearing is spendy... and you would have to re-gear the front and rear.
I think around $500 per axle is about normal? I could be wrong. But I know it's a few hundred. I hope that's what you were asking...
as for benefits to re-gearing? It all depends on how you drive, and what you want. Going to lower gearing will provide for more torque, but you will get a loss in gas mileage.
The main reason people re-gear, is when they go to a larger tire size. By re-gearing, you can get back to being close to the final gear that the OEM offered with original gearing and original tire size.

as for it being limited slip? Can't know for sure. There should be a metal tag on the rear diff. If it has a limited-slip, you will have the code 3L73. L for limited slip, 373 for 3.73:1 gears.

I used mostly 80w90 Royal Purple synthetic gear lube in my diffs. I think I have 1 quart of 75w140, and the rest was 80w90.

Thanks for the info. I really dont have much need to re gear but figured I would ask incase it would be something beneficial.

I will check the tab on my diff and see whats up. Since I still have my spare on since the tire place screwed me over it will make it pretty easy. Thanks for the info once again and have a great day man.

Rayz2000Sport · August 18, 2008

gavin said:
I used mostly 80w90 Royal Purple synthetic gear lube in my diffs. I think I have 1 quart of 75w140, and the rest was 80w90.

Is it OK to mix oil's like that? Having 80W90 and 75W140 in the same diff?

gavin · August 18, 2008

Rayz2000Sport said:
Is it OK to mix oil's like that? Having 80W90 and 75W140 in the same diff?

yup. Just like motor oil... won't hurt anything if you add different weights, as long as the oils are compatible.

Rayz2000Sport · August 19, 2008

S616E is the code I see on the tag on my diff, what is that supposed to signify?

gavin · August 19, 2008

Rayz2000Sport said:
S616E is the code I see on the tag on my diff, what is that supposed to signify?

good question.
there should be other numbers on the tag though, too. Usually includes OEM part, "axle code," and somewhere in there is the build date of some sorts I believe.

You may also check the door tag and see if it states the axle code there.

aldive · August 19, 2008

Rayz2000Sport said:
IIs my rear diff limited slip?

What is the code on the drivers door sticker?

Rayz2000Sport · August 19, 2008

I checked another thread and found the key that tells what all the codes signify.

Rayz2000Sport said:
Checked my door and this thread Transmission and Transfer Case Specs by year and it says that I have 42..... Open 8.8"..... 3200..... 4.10

I am taking this as I dont not have a limited slip diff, is that correct?

Rayz2000Sport · August 19, 2008

Hey Al, while I have your attenion haha.

Would you recommend taking my rear diff cover off to change the fluid if I am planning on switching to Amsoil? To my knowledge the diff has never been changed.

aldive · August 19, 2008

Rayz2000Sport said:
Would you recommend taking my rear diff cover off to change the fluid if I am planning on switching to Amsoil? To my knowledge the diff has never been changed.

By all means pull the cover to change the fluid, however, be sure you can remove the fill plug prior to the cover removal.

Good luck ....

Rayz2000Sport · August 19, 2008

aldive said:
By all means pull the cover to change the fluid, however, be sure you can remove the fill plug prior to the cover removal.

Good luck ....

Is there some sort of gasket I will need to replace/silcone?

Rayz2000Sport · August 19, 2008

haha And I forgot the dumb question, My diff is not limited slip correct?

aldive · August 19, 2008

Rayz2000Sport said:
haha And I forgot the dumb question, My diff is not limited slip correct?

What is the code?

aldive · August 19, 2008

Rayz2000Sport said:
Is there some sort of gasket I will need to replace/silcone?

No, just use RTV.

Rayz2000Sport · August 19, 2008

Cant find it on the tag, but I found 42 in the door panel.

Rayz2000Sport · August 19, 2008

RTV? Sorry I have no clue what that is, haha. I really appreciate all the help though. Thank you again. I have to step out for awhile, when I return I plan on running to get any supplies and get this fluid changed!

aldive · August 19, 2008

RTV - http://www.acehardware.com/product/index.jsp?productId=1419007

aldive · August 19, 2008

Rayz2000Sport said:
Cant find it on the tag, but I found 42 in the door panel.

42 = Open 4.10 gears

Rayz2000Sport · August 19, 2008

So I dont have limited slip?

2000 Sport Rear Diff

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