Rear Spring Isolator and other questions...

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08-26-2012, 02:37 PM

#21

Topless Stang

2nd Gear Member

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Join Date: Feb 2009

Location: FL

Posts: 453

Quote:

Originally Posted by 6-Speed

I use 75W140 without friction modifier ... no problems over several years. Some have reported gear/differential noise which was reduced by adding a few ounces of friction modifier to the RP. Does your axle have a factory limited-slip differential?

Yes, my 8.8 takeoff has factory LSD w/ABS & 4.10 gears.

08-26-2012, 04:09 PM

#22

6-Speed

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Join Date: Nov 2009

Location: AZ

Posts: 465

Quote:

Originally Posted by Topless Stang

Yes, my 8.8 takeoff has factory LSD w/ABS & 4.10 gears.

The RP Max Gear 75W140 should work just fine since it's a synthetic with friction modifiers in the formula.

08-26-2012, 09:59 PM

#23

Topless Stang

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Join Date: Feb 2009

Location: FL

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Thanks again everyone....I think I'm squared away on the rear end. The only question. Think that I have left involves the rear springs....does it matter how they sit on the isolator? I know the front upper isolator has a certain way the springs are seated, but how about the rear?

08-27-2012, 12:25 AM

#24

tigercrazy718

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Join Date: Mar 2009

Location: Houston, Texas

Posts: 1,731

Quote:

Originally Posted by Topless Stang

Just looked at it on AM and read the reviews. I think I'm going to go that route also. It looks like with the Royal Purple no friction modifier is needed. Does anyone have a recommended weight? There's three different ones on AM (75w90, 75w140 & 85w140).

i put RP in my new rear end, and it ground like a ****. had to add the friction modifier to make the noise go away. some people do and some people dont when they use RP

08-27-2012, 12:42 AM

#25

Torch_Vert

5th Gear Member

Join Date: Aug 2005

Location: Boston, MA

Posts: 3,213

Quote:

Originally Posted by Topless Stang

As far as how they're rotated, no, it doesn't matter on the rears. The isolators are flat. The don't have pockets the spring ends need to fit into like on the front.

08-27-2012, 08:04 AM

#26

Topless Stang

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Thanks again guys! I think I'll add the modifier just to be sure. I'll probably resurrect this thread when I get to my install lol.

08-27-2012, 10:57 PM

#27

6-Speed

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Join Date: Nov 2009

Location: AZ

Posts: 465

Quote:

Originally Posted by Topless Stang

I just installed my new springs with the lower pigtail positioned the same as the OEM springs I removed. Just make sure both springs are clocked the same. If your lowering springs have tight coils on one end, then the tight coils should be on top.

08-28-2012, 08:53 AM

#28

Topless Stang

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I'll keep that in mind. Thanks 6-Speed.

09-01-2012, 09:45 PM

#29

uin2it

3rd Gear Member

Join Date: Dec 2008

Location: Goldsboro, NC

Posts: 663

Quote:

Originally Posted by 6-Speed

I replaced my lower spring isolators with Energy Suspension Polyurethane isolators. Their model 9.6106 fit like a glove. They are sold in pairs and are inexpensive.

http://www.energysuspensionparts.com...sp?prod=9.6106

Are these isolators any thicker than the stock rubber ones?
I'm trying to get a bit more lift with ought changind the springs......but very slightly. Think I could try stacking the isolators?