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  #1  
Old 03-21-2009, 09:41 AM
Trakternut Trakternut is offline
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More Questions Than Answers.

I've got a '94 GMC CK1500 pickup truck. It's got the 5-speed manual trans.
I need to change the gear lube in all the boxes.

What lube do I use in the transmission? It's the aluminum case box. I hear that ATF is used in the transfer case, is that true?

How about the front diff?? What can I put in there so the little motor doesn't have to work so hard in cold weather. It can get down to -30 in winter, and +100 in summer.

OK, 'nuff questions.
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  #2  
Old 03-21-2009, 08:51 PM
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Re: More Questions Than Answers.

I looked but have not found the info for you yet. Give me a little time and I'll come up with it. I expect the dudes at NAPA would also be able to tell you whatever the manufacturer recommends.
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  #3  
Old 03-21-2009, 09:56 PM
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Re: More Questions Than Answers.

Thanks, Doc. I hate asking anybody who sells the stuff because they all want you to believe that their stuff is the only thing you should use.


that's why I'm going for a more independant opinion.
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  #4  
Old 03-21-2009, 09:59 PM
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Re: More Questions Than Answers.

All of the vehicles that I used to do my own maintenance on, I used 80 or 90 gear oil in the trans and diffs. Now that they have all this synthetic stuff requirements, I just let the "pros" do it.
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Old 03-21-2009, 10:55 PM
Trakternut Trakternut is offline
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Re: More Questions Than Answers.

Yeah, Ohio, I know. However, I just hate to pay somebody to do what I can do for myself.

These new fangled compooper brained cars we've got nowdays have to go to the pros enough.
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Old 09-16-2010, 08:52 AM
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Re: More Questions Than Answers.

Yo Tnutz, what did you end up using in your tranny? I'm mainly interested if you went to the synthetic and if you noticed any difference once you changed (smoother shifting etc).
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Old 02-15-2011, 11:42 AM
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Re: More Questions Than Answers.

Owners manual calls for proprietary syncromesh [sp?]in light duty 5 speed transmission. after changing a leaky rear seal i used GL5 85w-90 in mine . i wish i had spent $15/ qt. for the right stuff- it only takes 2qt. It has friction improvers for the syncros, but the problem with GL5 is it has an additive that dissolves the brass derived syncros . That $30 would have saved $1800, my mistake - please don't make it yours.
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Old 02-15-2011, 01:26 PM
Trakternutz Trakternutz is offline
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Re: More Questions Than Answers.

I haven't changed yet. I was talking to an Amzoil rep who can get me the stuff I need. I may go with the GM Syncromesh for the tranny, but the diffs take regular gear lube. I'll get some Amzoil for them. that way they won't be so stiff in the cold.
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  #9  
Old 02-16-2011, 07:18 AM
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Re: More Questions Than Answers.

If you have the G80 locker in the rear axle, there is a special lube you must use with it. Check the RPO sticker on the glove box door to know if you have the G80 or not.
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Old 02-16-2011, 07:24 AM
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Re: More Questions Than Answers.

No, it's not a locker. Just the standard run of the mill rear diff.
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