bsteff Posted November 30, 2005 Report Share Posted November 30, 2005 I changed the fluid in both my front and rear diffferentails last weekend. As I was pouring the last quart into the rear I noticed that quart seemed much darker. Sure enough a bottle of 75W-140 was mixed in with the 75W-90 I had bought. Since I had already started to pour it in and needed to used the truck I just finished. Question is will mixing these oils cause any problems? I have noticed a drop in fluel mileage, which I think may be due to the higher viscocity oil. Any thoughts? Link to comment Share on other sites More sharing options...
misterp Posted November 30, 2005 Report Share Posted November 30, 2005 As long as it's synthetic GL-5 hypoid gear lube it will not hurt anything. I wouldn't think it would affect your mileage enough to notice but it could be... Mr. P. Link to comment Share on other sites More sharing options...
detjoe Posted November 30, 2005 Report Share Posted November 30, 2005 when should these fluids get checked/changed? Did it help your front end noise? Link to comment Share on other sites More sharing options...
bsteff Posted November 30, 2005 Author Report Share Posted November 30, 2005 when should these fluids get checked/changed? Did it help your front end noise? <{POST_SNAPBACK}> I really wanted to do this to see if the sound from the front end would go away and it definietly did not. Guess I will be making it to the dealer before my warranty runs out. My gas mileage issue could be unrelated (bad tank of gas or something). Or maybe I am just being paranoid. Link to comment Share on other sites More sharing options...
misterp Posted November 30, 2005 Report Share Posted November 30, 2005 In my case changing fluids quieted everything down, especially the transfer case and the rear end - but with the poor quality control on these drivetrains I think everyone's experience here is going to be different. Mr. P. Link to comment Share on other sites More sharing options...
BenKey Posted December 2, 2005 Report Share Posted December 2, 2005 when should these fluids get checked/changed? Did it help your front end noise? <{POST_SNAPBACK}> Refer to your maint. book. If that is not often enough for you, do it more often. Link to comment Share on other sites More sharing options...
bsteff Posted December 8, 2005 Author Report Share Posted December 8, 2005 I had my truck into the dealer yesterday. They replaced the bearings and seals in the front differential under warranty. My gas mileage is back up where it used to be but the damn thing still howls when going around corners Should they have replaced more than just the bearings and seals. The invoice says "Bearing Failure - Recondition Front Differential." If a bearing failed and debris was in the differential shouldn't all the gears be replaced as well. Looks like they will be getting another phone call shortly Link to comment Share on other sites More sharing options...
CoolBlueSS Posted December 10, 2005 Report Share Posted December 10, 2005 I had my truck into the dealer yesterday. They replaced the bearings and seals in the front differential under warranty. My gas mileage is back up where it used to be but the damn thing still howls when going around corners Should they have replaced more than just the bearings and seals. The invoice says "Bearing Failure - Recondition Front Differential." If a bearing failed and debris was in the differential shouldn't all the gears be replaced as well. Looks like they will be getting another phone call shortly <{POST_SNAPBACK}> It all depends on how bad it was, or how many miles it has. Mine were replaced at 31K miles, bearings, seals, and gears. Even then it still made noise around corners. Changed fluid in the t-case using AutotrakII fluid, noise was better but still there. After some miles were put on the new gears I changed front and rear fluids. Seemed to run smoother, but still a little noisey around corners. Everything seems to be in good working order, so I'm just going to live with it. Maybe when I get exhaust that'll drownd it out. Link to comment Share on other sites More sharing options...
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