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Old 01-30-2014, 10:27 PM   #1
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Fluid changes

So meant to do this awhile back but I figure this weekend I wanna finally do it. Gonna change the oil and all fluids out. Question is what type of fluid goes in to the Differential and Transmission? Its a 1998 Wrangler 2.5L 4cyl manual.

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Old 01-31-2014, 06:54 AM   #2
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diffs - 80W-90 GL-5 oil (75W-140 for towing, add friction modifier for limited slip diff)
trans - 75W-90 GL-3 oil

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Old 01-31-2014, 09:39 AM   #3
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trans - 75W-90 GL-3 oil
It's gonna be hard to find a GL-3 since the newer updated GL-4 came out years ago. I personally have never seen a GL-3.

A very good GL-4 75W-90 for the OP's transmission would be Redline MT-90 available from www.summitracing.com.
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Old 01-31-2014, 12:03 PM   #4
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It's gonna be hard to find a GL-3 since the newer updated GL-4 came out years ago.

That'll help the OP out. I was just relating what the FSM specified.
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Old 01-31-2014, 12:55 PM   #5
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Yep I had read that GL-4 replaced GL-3. Is most of this stuff available at orielys? I live in Hawaii so not a lot of options on an island
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Old 01-31-2014, 12:56 PM   #6
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And thanks for replies
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Old 01-31-2014, 04:59 PM   #7
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Yep I had read that GL-4 replaced GL-3. Is most of this stuff available at orielys?
Highly unlikely which is why I gave the link to Summit Racing. An approved alternative lube is synthetic 10W -30 engine oil which has a viscosity similar to 75W-90 gear lube. Gear lubes and motor oils are measured on two different viscosity scales so while their viscosities sound miles apart, they really aren't.
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Old 01-31-2014, 05:48 PM   #8
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Yep I had read that GL-4 replaced GL-3. Is most of this stuff available at orielys?
Highly unlikely which is why I gave the link to Summit Racing for the highly recommended Redline MT-90. An approved alternative lube is synthetic 10W -30 engine oil which has a viscosity similar to 75W-90 gear lube. Gear lubes and motor oils are measured on two different viscosity scales so while their viscosities sound miles apart, they really aren't.
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Old 02-01-2014, 02:21 PM   #9
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So looked in my chiltons and it says GL-5
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Old 02-01-2014, 03:39 PM   #10
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So looked in my chiltons and it says GL-5
Gl-5 for what? Axles... yes
Transmission... no

I use the redline linked above in my trans and have no complaints
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Old 02-01-2014, 06:53 PM   #11
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So looked in my chiltons and it says GL-5
That is based on old incorrect manuals which were later quietly corrected by the factory. Neither Chiltons nor Haynes manuals are trustworthy, I'd never waste my $$$ on either.

Using GL5 won't cause immediate damage, its problem is long term accelerated wear on the synchros.

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