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2006 V6 RWD SRX | 2005 Red CTS-V
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117 Posts
Discussion Starter #1
Picking up the V after a diff replacement and being told my car doesn't have an RPO for a posi track rear so they are not putting the friction additive in. Don't all Vs have posi and if so, how can I prove it to them without leaving 2 big black streaks in their lot?
 

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'06 Z06, '05 CTS-V 453rwhp/434rwtq (sold)
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4,455 Posts
Tell them to read the owners manual! Under recommended fluids and lubricants! Limited Slip!!!!!


SAE 75W-90 Synthetic Axle
Lubricant (GM Part No. U.S.
12378261, in Canada 10953455)
meeting GM Specification 9986115.
With a complete drain and refill add
4 ounces (118 ml) of Limited-Slip
Axle Lubricant Additive (GM Part
No. U.S. 1052358, in Canada
992694) where required.
See Rear Axle on page 5-48


:nono:
 

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2006 V6 RWD SRX | 2005 Red CTS-V
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117 Posts
Discussion Starter #4
thanks, he's stuck on the "where required" terminology, saying mine does not have a posi rear.
Anyone know a phone number I can call to have these guys believe all Vs have posi?
 

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2006 V6 RWD SRX | 2005 Red CTS-V
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117 Posts
Discussion Starter #5
to be fair, I'm dealing with someone from the shop, as my service writer is on lunch right now. I bought myself some time as they didn't flash the new radio for a V so they just took it back while I wait. It would be great if I could resolve the posi issue before they finish
 

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05 PLATINUM CTS-V
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2,985 Posts
if all else fails just show them!! :burn:


good luck! i would just wait til your advisor gets back.
 

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2006 V6 RWD SRX | 2005 Red CTS-V
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117 Posts
Discussion Starter #7
LOL. The guy I was dealing with just came out and said he checked with another tech (senior guy) who set him straight. They're putting the additive in now.

Thanks guys!
 

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Platinum 2004 CTS-V
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4,914 Posts
The V is a LSD (limited slip diff) , not posi. You NEED the friction modifier for the clutch packs!! Your dealer is a MORON
 

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04 CTS-V with a little hp persuasion device
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3,824 Posts
put a jack under the ass end and put the car in neutral and spin one of the tires. If the other spins the same direction then its a posi. If it spins the opposite direction then its an open diff. It WILL spin the same direction.
 

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Platinum 2004 CTS-V
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For lack of better terms, most people consider them the same thing....but.....
Posi is a locked rear end-both wheels get same amount of power.

Limited Slip has clutch packs that "lock" the axle (or axles) together. This is why you need the friction modifier.
 

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05 CTS-V raven black
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1,131 Posts
For lack of better terms, most people consider them the same thing....but.....
Posi is a locked rear end-both wheels get same amount of power.

Limited Slip has clutch packs that "lock" the axle (or axles) together. This is why you need the friction modifier.
:thumbsup:

i always use the test method....if you turn a sharp corner and the outside tire churps you have Posi...

I heard before that in the "old days" they used to weld Open diffs to make them Posi...????
 

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04 CTS-V with a little hp persuasion device
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I heard before that in the "old days" they used to weld Open diffs to make them Posi...????
Some rednecks still do it to their ol' chevy's! :alchi: They do that in conjunction with the blown out glass packs to get her to launch good!

Kidding aside, I dont remember who I was talking to but he told me he broke the rear end or something. He opened it up and it had broken the spider gears so he just welded it solid and ran it until it broke again, then he bought a salvaged one.
 

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'05 CTS-V, '00 SLS, 98 SLS, 89 Eldo, '80 Eldo
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Get a part number. Make sure they didn't put in a CTS diff. I doubt they're limited slip.
 
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