Stupid question - JeepForum.com
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post #1 of 8 Old 07-09-2020, 07:58 AM Thread Starter
tecumsa
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Stupid question

No doubt this is, but are there front and rear differentials on this vehicle?

I hit 58k so I was preparing to change the fluid, like I do on my Wrangler, got underneath and the front is covered up by a brush guard, so I went to look at the rear and all I can see is the gas tank. Went into the service manual and the only thing it talks about with regards to a differential is with regards to the auto trans.

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post #2 of 8 Old 07-09-2020, 10:00 AM
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Originally Posted by tecumsa View Post
No doubt this is, but are there front and rear differentials on this vehicle?

I hit 58k so I was preparing to change the fluid, like I do on my Wrangler, got underneath and the front is covered up by a brush guard, so I went to look at the rear and all I can see is the gas tank. Went into the service manual and the only thing it talks about with regards to a differential is with regards to the auto trans.
Technically there are no differentials .. Up front it's a PTU Power transfer unit and out back its a RDA Rear drive assembly. Both take regular SAE 80W-90 API GL 5 gear oil . There's no covers to take off, so you'll need a lube pump with a longer hose especially for the back as the fill hole is pretty tight . I use a marine lower unit pump myself just because it's cheap and easy.

The only thing i'm unsure of is if the 2014+ with the Hyundai 6sp auto trans has the same RDA .

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
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post #3 of 8 Old 07-09-2020, 03:17 PM Thread Starter
tecumsa
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Originally Posted by yzjwk View Post
Technically there are no differentials .. Up front it's a PTU Power transfer unit and out back its a RDA Rear drive assembly. Both take regular SAE 80W-90 API GL 5 gear oil . There's no covers to take off, so you'll need a lube pump with a longer hose especially for the back as the fill hole is pretty tight . I use a marine lower unit pump myself just because it's cheap and easy.

The only thing i'm unsure of is if the 2014+ with the Hyundai 6sp auto trans has the same RDA .
For the front do I need to drop the brush cover?

Is there a drain plug, or did you pump it out as well?
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post #4 of 8 Old 07-09-2020, 05:42 PM
skjeep
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Technically - there ARE differentials. Otherwise the wheels would chirp in curves

Front differential is inside transmission. It has a normal ring gear and pinion. With FWD it drives the axleshafts and front wheels directly.
With 4WD there is a power transfer unit (PTU) which takes power from the differential carrier thru splined shaft and sends it to the back.
There is an electric coupling and behind that is just an another standard plain differential

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post #5 of 8 Old 07-09-2020, 07:29 PM
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Quote:
Originally Posted by tecumsa View Post
For the front do I need to drop the brush cover?

Is there a drain plug, or did you pump it out as well?
Both have a drain and a fill plug.. Iirc I had to remove the front skid plate to get at the front PTU . Donít forget to loosen the fill plug first especially on the back cause itís a tight squeeze.

5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
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post #6 of 8 Old 07-09-2020, 07:40 PM Thread Starter
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Originally Posted by yzjwk View Post
Both have a drain and a fill plug.. Iirc I had to remove the front skid plate to get at the front PTU . Donít forget to loosen the fill plug first especially on the back cause itís a tight squeeze.
I was looking at it tonight, where is the fill plug located? I could find the drain plug, but not the fill.
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post #7 of 8 Old 07-09-2020, 08:03 PM
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Originally Posted by tecumsa View Post
I was looking at it tonight, where is the fill plug located? I could find the drain plug, but not the fill.
This thread has the info https://www.jeepforum.com/forum/f98/...hange-1038490/
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5 and counting :05 WK 5.7 HEMI
90 YJ Islander 4.2L
94 ZJ Ltd 5.2 ,00 WJ 4.0
2010 MK Patriot
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post #8 of 8 Old 07-09-2020, 08:07 PM Thread Starter
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Thanks! That's a big help.
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