Need some quick advise

[Tahoe_96]

So I have had my Tahoe back for a few months now after letting family use over the past 2.5 years. I have been doing small little tune ups on it to make sure it in godd running order. In a couple weeks I have a 14 hour trip and I want to take the hoe. And I dnt believe the that the the oil in the front or rear diff have ever been changed. Has 145,000 original miles. So my question is will changing the diff fluid before this trip be a good idea or will this reveal hidden problems?

 

[purple 'hoe]

It won't hurt anything really, Unless you have an internal problem with your rear differential when you put the cover off and find something out of place. But then at least you can fix it then and there instead of having an issue down the road. That's the only thing I can really think of, which I don't think would be your issue, if your not having problems right now with them

Also, make sure your axle seals are not leaking. If they are, replace them. And use a friction modifier for the rear axle if you have the G80

 

[Tahoe_96]

It won't hurt anything really, Unless you have an internal problem with your rear differential when you put the cover off and find something out of place. But then at least you can fix it then and there instead of having an issue down the road. That's the only thing I can really think of, which I don't think would be your issue, if your not having problems right now with them

Also, make sure your axle seals are not leaking. If they are, replace them. And use a friction modifier for the rear axle if you have the G80

1. How do I check my axle seals and are they hard to replace?
2.What is friction modifier? (I have G80)
3. And what gear oil in recomended?

Thanks for the reply

 

[gpracer1]

It won't hurt anything really, Unless you have an internal problem with your rear differential when you put the cover off and find something out of place. But then at least you can fix it then and there instead of having an issue down the road. That's the only thing I can really think of, which I don't think would be your issue, if your not having problems right now with them

Also, make sure your axle seals are not leaking. If they are, replace them. And use a friction modifier for the rear axle if you have the G80

I think you mean DON'T use friction modifier!

 

[Tahoe_96]

so friction modifier or no friction modifier.....and best synthetic for the price

 

[purple 'hoe]

I think you mean DON'T use friction modifier!

Err, yeah. My bad. I typed that not thinking totally

There's a TSB about it from GM from 2008. The G80 has clutches in it, but does not require a modifier.

 

[SunlitComet]

it won't make things worse but will lengthen it life if it is crappy. SAE 80W-90 GL5. Do not use limited slip additive aka friction modifiers. that will work in both axles. you can go synthetic on the '96 as well. and which seal do you mean. something don't look right?

 

[Tahoe_96]

awesome thanks for the info.....now just gotta decide on what brand...does walmart have any good choices or should i just stick with the parts house

 

[Tahoe_96]

went by walmart to see what they had and all they sell here is the supertech brand....they had a Full synthetic 75w-90 GL5....Is this stuff any good

 

[SunlitComet]

Valvoline or for the best Mobil synthetic 75w-90.