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best rear end oil

This is a discussion on best rear end oil within the Drivetrain forums, part of the LSx Technical Help Section category; i will be doing a full spring time fluid change(oil,trans,coolant)etc.but i dont know which gear oil would be best for ...

  1. #1
    **Te@M fBoDy** fbodyNATION's Avatar
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    best rear end oil

    i will be doing a full spring time fluid change(oil,trans,coolant)etc.but i dont know which gear oil would be best for my rear end,what gear oil are you guys using? what do you recommend? i have a 2000 T/A thanks

  2. #2
    Senior Member TLS_Addict's Avatar
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    I am going to try the Mobil 1 75-90.

    Check this out. Gear Lube

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    Electrical Engineer KMdef9's Avatar
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    I have Royal Purple in mine. Mobil 1 would be fine with me as well.

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    Good old Valvoline 80W-90 right now. May switch over to Amsoil this summer.

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    Senior Member JayTA98's Avatar
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    valvoline here as well.

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    Grand Imperial Wizard Sarge's Avatar
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    This is recent (GL-5) and well done by a respected lab utilizing accepted certifiable repeatable testing. Make/draw your own conclusions.....
    Gear Lube Test

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    autoconnectionllc.com 02transamce's Avatar
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    Valvoline 80w90
    Posted via Mobile Device

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    Great info. Looks like the Valvoline is getting drained out next time the car goes in the air.

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    Member iam_dale's Avatar
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    DAMNIT!! All I've seen on base here for gear lube is RP...and it's $20/liter......

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    Senior Member TLS_Addict's Avatar
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    Been 200 miles on the gear change and the gears are doing great with the Mobil 1 I used. No chatter or anything.

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    Senior Member FasstChevys's Avatar
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    Quote Originally Posted by TLS_Addict View Post
    Been 200 miles on the gear change and the gears are doing great with the Mobil 1 I used. No chatter or anything.
    Well - the only way to truly know what's going on in there is to take a sample, and send it off for testing.

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    Senior Member TLS_Addict's Avatar
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    Very true, as its been 200 miless I am going to leave it be for a while.

    I might do that though so that the it can go on record here for others on the site.

  13. #13
    Moderator Cutlass's Avatar
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    Quote Originally Posted by Sarge View Post
    Make/draw your own conclusions.....
    A test sponsored by Amsoil where Amsoil is the clear winner...any reason to be suspicious?

  14. #14
    I don't sell out! blackSS01's Avatar
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    I go with Amsoil.
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    Member bberretta's Avatar
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    It also depends on the posi you have- if you have a clutch pack posi then I was recommended by MidWest Chassis to stay away from synthetic gear oils and stick with conventional 80w90 and use the appropriate posi additive. I've had my 9" running for 6k miles with that and it's the quietest thing on my car!
    2000 Pontiac Firehawk #0041 of 742

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    PCM Designer 99WickedSS's Avatar
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    Quote Originally Posted by bberretta View Post
    It also depends on the posi you have- if you have a clutch pack posi then I was recommended by MidWest Chassis to stay away from synthetic gear oils and stick with conventional 80w90 and use the appropriate posi additive. I've had my 9" running for 6k miles with that and it's the quietest thing on my car!
    You beat me to it...I have a Moser 12 bolt Eaton posi and Moser specifically states all of their testing is conducted using conventional 80w90 and GM friction additive 1052358. This combination has proved reliable and keeps it quiet.

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    Quote Originally Posted by 99WickedSS View Post
    You beat me to it...I have a Moser 12 bolt Eaton posi and Moser specifically states all of their testing is conducted using conventional 80w90 and GM friction additive 1052358. This combination has proved reliable and keeps it quiet.

    CompSyn actually posted up some good info in response to why Moser recommends conventional gear oil. Essentially, it is based on some very outdated testing. I will be switching our Moser over to Amsoil this summer.

  18. #18
    PCM Designer 99WickedSS's Avatar
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    Quote Originally Posted by pajeff02 View Post
    CompSyn actually posted up some good info in response to why Moser recommends conventional gear oil. Essentially, it is based on some very outdated testing. I will be switching our Moser over to Amsoil this summer.
    Let me know how it works out, perhaps next summer I'll change over to synthetic.

  19. #19
    The Bandit Wesman's Avatar
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    Quote Originally Posted by Cutlass View Post
    A test sponsored by Amsoil where Amsoil is the clear winner...any reason to be suspicious?
    I was thinking the same thing.

    The Amsoil did not only win, but it beat the other oils by a huge margin. Just seemsa little too coincidental.

    I'm going to be running Redline Shockproof 75W-250 in my rear as soon as the gears are broken in. The stuff is amazing, its extremely viscous and clings to bearing and gears better than anything I've ever seen, yet it only has the frictional loss of a 75W-90. With all the failures of rears in our cars due to shock loading which results in broken gear teeth and damaged bearings, this product should be excellent. My friend has been running it in his '05 GTO and he's been very satisfied with the performance.

  20. #20
    autoconnectionllc.com 02transamce's Avatar
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    Quote Originally Posted by pajeff02 View Post
    CompSyn actually posted up some good info in response to why Moser recommends conventional gear oil. Essentially, it is based on some very outdated testing. I will be switching our Moser over to Amsoil this summer.
    keep us updated,i would like to run a good syn gear oil in my moser 12 bolt but as you know they strictly said 80w90 conventional,btw mine has eaton clutch disc style posi.
    2007 Corvette...stock...

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