Rear Differentail Fluid Change Questions

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Mar 19, 2013 | 08:52 PM

KJL

Thread Starter

Melting Slicks

Joined: Nov 2000

Posts: 2,738

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From: Bogart GA

Rear Differentail Fluid Change Questions

I actually did this a few years ago to my 96 and now want to to do it for my 95 ZR1. Funny thing is I forgot how I did it. What side is the plug on? What size is hex wrench does it take? What is best way to access plug? If I recall I had the car up on ramps and jacked the rear of the car up and placed on stands. If I recall if was a real pain to get to.

I have a vacuum pump and all the tools at least.

Mar 19, 2013 | 09:10 PM

LT4 F45

Burning Brakes

Joined: Apr 2007

Posts: 1,178

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From: Montreal Quebec

It is on the passenger side and not that bad to get to...

Mar 19, 2013 | 09:35 PM

Glenno

Racer

Joined: Dec 2012

Posts: 301

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From: NY

Quote:

Originally Posted by LT4 F45

It is on the passenger side and not that bad to get to...

What is the correct limit slip fluid to use? Brand, weight, additives, etc?

Mar 19, 2013 | 09:46 PM

WVZR-1

Team Owner

Joined: Sep 2003

Posts: 25,394

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Quote:

Originally Posted by Glenno

What is the correct limit slip fluid to use? Brand, weight, additives, etc?

That debate happens pretty frequently and is a "personal choice"!

FSM specifies I believe 80W-90 GL5 and GM additive. Lubricants have improved through the years and you can consider the FSM as I guess a "minimum" spec. The debate can be likely a couple pages. I've always used the GM fluids. Habit!

The original I still have is 1052271 and 1052358 for additive. Both I believe have recently changed part numbers.

KJL - you asked fill plug size - 3/8 hex I believe if original. You asked how? It will all come back to you!

Mar 19, 2013 | 09:47 PM

Glenno

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Joined: Dec 2012

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From: NY

Quote:

Originally Posted by WVZR-1

Thanks for the info.

Mar 19, 2013 | 10:02 PM

Kevin Woods

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Joined: Dec 2007

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From: San Antonio Texas

Quote:

Originally Posted by Glenno

What is the correct limit slip fluid to use? Brand, weight, additives, etc?

Quote:

Originally Posted by WVZR-1

That debate happens pretty frequently and is a "personal choice"........I've always used the GM fluids........

Yep.....matter of personal choice......and I also use the GM fluid

.

Takes all the 'guesswork' out of the equation

.

KW

Mar 19, 2013 | 11:47 PM

383vett

Race Director

Joined: Apr 2003

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From: moraga ca

The size for mine was one big vicegrip.

Mar 20, 2013 | 06:22 AM

Glenno

Racer

Joined: Dec 2012

Posts: 301

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From: NY

Quote:

Originally Posted by Kevin Woods

Yep.....matter of personal choice......and I also use the GM fluid

.

Takes all the 'guesswork' out of the equation

.

KW

Does the GM type fluid come with the slip additive already in it or do you purchase two products and mix them? Thanks

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Mar 20, 2013 | 06:53 AM

WVZR-1

Team Owner

Joined: Sep 2003

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Quote:

Originally Posted by Glenno

Does the GM type fluid come with the slip additive already in it or do you purchase two products and mix them? Thanks

Use the part #'s in my post -- additive is a seperate purchase (*you need just 1)

*people mention using 2 if they have problems - I don't know that actually helps.

Mar 20, 2013 | 07:26 AM

#10

ex-x-fire

Melting Slicks

Joined: Dec 2009

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Get yourself a long 3/8 wrench & a 3/8 allen wrench, cut the allen wrench to make a bit about 1.5" long. The have the bit welded to the 3/8 wrench.

Mar 20, 2013 | 07:48 AM

#11

KJL

Thread Starter

Melting Slicks

Joined: Nov 2000

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From: Bogart GA

Thanks for the feed back, I believe I have an allen 3/8" socket already, I guess I will need to remove the passenger side rear wheel and jack the car up access.

Mar 20, 2013 | 02:23 PM

#12

KJL

Thread Starter

Melting Slicks

Joined: Nov 2000

Posts: 2,738

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From: Bogart GA

I have Mobil 1 75W90 Synthetic, will this work? I think I read in a thread that this was ok to use.

Mar 20, 2013 | 04:14 PM

#13

LT4 F45

Burning Brakes

Joined: Apr 2007

Posts: 1,178

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From: Montreal Quebec

I use Amsoil 75W90 no additive
Work great but right after the change i had to make 8's figure in a empty parking lot to get the fluid to the clutch in the diff...

Mar 20, 2013 | 04:50 PM

#14

DAVECAD2.0

Instructor

Joined: Feb 2007

Posts: 132

Likes: 3

From: CRYSTAL RIVER FL.

Quote:

Originally Posted by KJL

Thanks for the feed back, I believe I have an allen 3/8" socket already, I guess I will need to remove the passenger side rear wheel and jack the car up access.

Or, or, you could just buy one. They come in long and short hex lenghts. About $10.00 for a cheapo and about $25.00 for Snap-On.

MTCW