RottenSS Posted July 9, 2015 Report Share Posted July 9, 2015 So I'm going to change my front and rear diff fluid and I've done this before and guessing it's strait forward just haven't owned an AWD vehicle so wasn't sure if anything was different besides the normal steps. My SS is a 2003 and I don't have the owners book. Anyone know the fluid amount and weight? And recommendations on brand? Anything I should keep my eyes open for while doing this? Quote Link to comment Share on other sites More sharing options...
1BAD2K Posted July 9, 2015 Report Share Posted July 9, 2015 75w140 and I would use redline or am soil severe gear. Neither of which will need any other additives. Quote Link to comment Share on other sites More sharing options...
RottenSS Posted July 9, 2015 Author Report Share Posted July 9, 2015 75w140 and I would use redline or am soil severe gear. Neither of which will need any other additives. And that's for both front and rear diff? Is that what you use? I've tried to researched it a bit but seeing a handful of different weights. I've seen only use synthetic in the front. Quote Link to comment Share on other sites More sharing options...
MARTYW Posted July 10, 2015 Report Share Posted July 10, 2015 (edited) I put Amsoil in my front and Mobil 1 in the rear. Im pretty sure I used 75W-90 in both. Nothing is different about the process. If you change your transfer case fluid, use the blue stuff from GM. Edited July 10, 2015 by MARTYW (see edit history) Quote Link to comment Share on other sites More sharing options...
levilz Posted July 10, 2015 Report Share Posted July 10, 2015 (edited) 75W90 in the front and rear. I use AMSOIL Severe Gear in all my vehicles. The actual capacities are 4.2pt in the rear and 3pt in the front (7.2pt or 3.6qt), so you would need 4qt total. Also, the transfer case takes 4.4pt, or 2.2qt of ATF Here are links to the products I use. SG 75W90. http://www.amsoil.com/shop/by-product/gear-lube/severe-gear-75w-90/?code=SVGQT-EA Signature Series Multi-Vehicle ATF. http://www.amsoil.com/shop/by-product/transmission-fluid/automatic/signature-series-multi-vehicle-synthetic-automatic-transmission-fluid/?code=ATFQT-EA If you're interested, and don't know a local dealer, shoot me a message and I'll quote you. I've got dealer status and should be able to ship it to you for the same, or a little less than if you would buy it local retail. Edited July 10, 2015 by levilz (see edit history) Quote Link to comment Share on other sites More sharing options...
RottenSS Posted July 10, 2015 Author Report Share Posted July 10, 2015 What about additives? Seems like adding some or not adding some to the rear could be bad and I've seen posts about both. Quote Link to comment Share on other sites More sharing options...
1BAD2K Posted July 10, 2015 Report Share Posted July 10, 2015 And that's for both front and rear diff? Is that what you use? I've tried to researched it a bit but seeing a handful of different weights. I've seen only use synthetic in the front. Yes, that is what I use. I have not used additives, and haven'3t had a problem. I have heard mobil delvac is good stuff, but haven't found it locally to try ever. I wouldn't use Mobil 1 though. Quote Link to comment Share on other sites More sharing options...
levilz Posted July 14, 2015 Report Share Posted July 14, 2015 Sorry, I was away all weekend and just got back today. I sent you a pm. I've heard some people say they used the additive with the AMSOIL, but PERSONALLY, I never have in either of the SS's I've had, or in my Trans AM. Additionally, none of the people I've sold to in the past have come back telling me that they needed it. It's $6-$7 more on an order to ship it along with the fluid, so I give the option and if the individual feels that it's worth it to have it and not need it, I'll order it too. I went ahead and got it when I did my first one, and just never used it. It'll let you know with some minor chatter if it will be needed. Quote Link to comment Share on other sites More sharing options...
Normandy Posted August 23, 2015 Report Share Posted August 23, 2015 Does anyone know if the factory transfer case and rear diff oil are synthetic or conventional? If their conventional, has anyone seen any MPG or performance gains by switching to synthetic? Quote Link to comment Share on other sites More sharing options...
levilz Posted August 28, 2015 Report Share Posted August 28, 2015 Both the diffs and the trans fluid that GM uses in the transfer case are synthetics. Quote Link to comment Share on other sites More sharing options...
someotherguy Posted August 28, 2015 Report Share Posted August 28, 2015 What about additives? Seems like adding some or not adding some to the rear could be bad and I've seen posts about both. The locking unit used in GM fullsize trucks (RPO G80) is the Eaton Gov-Loc and you should not use any kind of additive with the gear oil. There's a TSB out regarding this; friction additives that are typical for posi units can cause the Gov-Loc to not operate properly. I've seen the conflicting information about this but you can rest assured, the Gov-Loc wants regular gear oil, no posi-style additives. Richard Quote Link to comment Share on other sites More sharing options...
Normandy Posted August 29, 2015 Report Share Posted August 29, 2015 Both the diffs and the trans fluid that GM uses in the transfer case are synthetics. Thank you Quote Link to comment Share on other sites More sharing options...
levilz Posted September 1, 2015 Report Share Posted September 1, 2015 Not a problem! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.