hexel Posted February 17, 2007 Share Posted February 17, 2007 Going to change both frotn and rear differential fluids in LGT 2006 automatic with limited slip rear end. Looking at best quality fluids- what do you think of Amsoil series gear lube synthetic 75-90W? Do I need to add limited slip additive to rear differential? Appreciate any input- thanks. Link to comment Share on other sites More sharing options...
Xenonk Posted February 17, 2007 Share Posted February 17, 2007 no need for the addative. Most people here either run Redline (me) or Royal Purple. A few have used Mobil1, not how many uses Amsoil. Keefe Link to comment Share on other sites More sharing options...
rao Posted February 17, 2007 Share Posted February 17, 2007 The limited slip itself is sealed so you can't change the fluid in it - you are only changing the fluid for the ring and pinion. Rob IF YOU CARE ABOUT YOUR CAR YOU SHOULD NEVER DRIVE IT Link to comment Share on other sites More sharing options...
edmundu Posted February 18, 2007 Share Posted February 18, 2007 I have run the Amsoil severe duty 75w90, and it performed very well:). Link to comment Share on other sites More sharing options...
Soobie-do Posted May 7, 2008 Share Posted May 7, 2008 Can research some gear oil info here; http://www.amsoil.com/products/gearlubes/WhitePaper.aspx Link to comment Share on other sites More sharing options...
pillboy Posted May 8, 2008 Share Posted May 8, 2008 The limited slip itself is sealed so you can't change the fluid in it - you are only changing the fluid for the ring and pinion. My new thing I learned for the day today. Thanks rao. It is still ugly. Link to comment Share on other sites More sharing options...
lilbrudder Posted May 8, 2008 Share Posted May 8, 2008 extra-s, ssshhhhh! it's our secret weapon. Link to comment Share on other sites More sharing options...
scooby600 Posted May 9, 2008 Share Posted May 9, 2008 I was looking to do this also, how many quarts would I need to buy to do this and transmission fluid? Link to comment Share on other sites More sharing options...
scooby600 Posted May 9, 2008 Share Posted May 9, 2008 nm found it Link to comment Share on other sites More sharing options...
D_J Posted June 7, 2008 Share Posted June 7, 2008 How much is your odometer? Only a 2006 and already doing a fluid change? I thought that was done at 100K. Link to comment Share on other sites More sharing options...
TNPaparazzi Posted June 7, 2008 Share Posted June 7, 2008 I thought it was done at 60k? Link to comment Share on other sites More sharing options...
Supra333 Posted June 10, 2008 Share Posted June 10, 2008 Its done in 30k intervals starting at 30k Link to comment Share on other sites More sharing options...
TNPaparazzi Posted June 10, 2008 Share Posted June 10, 2008 I thought the big one was at 60 k though and then at 100 or 120? Link to comment Share on other sites More sharing options...
Supra333 Posted June 10, 2008 Share Posted June 10, 2008 Yes but diff fluid is changed every 30k Link to comment Share on other sites More sharing options...
fishbone Posted June 17, 2008 Share Posted June 17, 2008 My dealer is freakin' clueless and has managed to instil some lack of confidence in me. I had called today to ask how much they would charge for a diff oil and what they had on stock. They said plain 90-weight oil. I asked about 75w90 and I quote the guy on the phone "Well, that's synthetic and it's not recommended, but it's your car I guess" Wtf is he talking about? I thought the Extra-S stuff was synthetic also? Link to comment Share on other sites More sharing options...
jarrod Posted June 17, 2008 Share Posted June 17, 2008 My dealer is freakin' clueless and has managed to instil some lack of confidence in me. I had called today to ask how much they would charge for a diff oil and what they had on stock. They said plain 90-weight oil. I asked about 75w90 and I quote the guy on the phone "Well, that's synthetic and it's not recommended, but it's your car I guess" Wtf is he talking about? I thought the Extra-S stuff was synthetic also? Yea I wouldn't let them change it Link to comment Share on other sites More sharing options...
Metal2You Posted June 17, 2008 Share Posted June 17, 2008 I asked about 75w90 and I quote the guy on the phone "Well, that's synthetic and it's not recommended, but it's your car I guess" He has no clue what he's talking about. 75w90 is the only fluid for our rear diffs and you can get it synthetic or natural. Link to comment Share on other sites More sharing options...
fishbone Posted June 17, 2008 Share Posted June 17, 2008 Front for 5EAT is the same, yes? Link to comment Share on other sites More sharing options...
Metal2You Posted June 17, 2008 Share Posted June 17, 2008 Hmmm. I'm not positive on the auto trans. Link to comment Share on other sites More sharing options...
fishbone Posted June 17, 2008 Share Posted June 17, 2008 No, what I meant was, the front and rear diffs use the same fluid? Or does the 5EAT share the fluid with the front diff like on the manual, from what I gather? Link to comment Share on other sites More sharing options...
Metal2You Posted June 17, 2008 Share Posted June 17, 2008 I know in the manual the front and rear use different fluids. They may be the same weight, but the front has an additive that the rear doesn't? I can't recall right now. Link to comment Share on other sites More sharing options...
fishbone Posted June 17, 2008 Share Posted June 17, 2008 You are correct, the front is 75W90NS, the rear is 75W90 IIRC. The front doesn't have friction modifiers as those interfere with the transmission. Link to comment Share on other sites More sharing options...
SBT Posted June 17, 2008 Share Posted June 17, 2008 You are correct, the front is 75W90NS, the rear is 75W90 IIRC. The front doesn't have friction modifiers as those interfere with the transmission. For MTs the tranny (which includes the front diff) and the rear diff all use the same 75W90W fluids. For ATs, the front and rear diffs use the same 75W90W fluid that the MTs use. See the attached for recommended materials and drain/fill locations for the diffs. SBT14 - Front & Rear Differential Gear Oil Replacement.pdfRecommended Materials.pdf - Pro amore Dei et patriam et populum - Link to comment Share on other sites More sharing options...
trailblaze Posted July 7, 2008 Share Posted July 7, 2008 those last PDF's helped a little... i take it i need (for a 05'GT 5EAT) about 3 QTS of any normal 75w90w differential oil, a new gasket for both diffs, and that liquid gasket for the rear? does this sound about right... Link to comment Share on other sites More sharing options...
spatuality Posted August 3, 2008 Share Posted August 3, 2008 For MTs the tranny (which includes the front diff) and the rear diff all use the same 75W90W fluids. For ATs, the front and rear diffs use the same 75W90W fluid that the MTs use. See the attached for recommended materials and drain/fill locations for the diffs. SBT Can someone provide more information about changing the transmission and rear differential oil on 5MT's? The PDF's from the russian site show the same 4at and 5at's as these pdf's. ie.: -is there a gasket on the transmission drain bolt or rear diff that needs to be changed? Is it liquid gasket and what kind have you used? -any pictures of the drain bolt locations and tips / walkthrough on changing the fluids on 5mt's? -what are the torque specifications on the transmission and rear diff 5mt drain bolts? Brian Link to comment Share on other sites More sharing options...
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