AX-15 Transmission Flush on 4.0L YJ - Jeep Wrangler Forum
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Old 12-09-2012, 04:16 PM   #1
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Exclamation AX-15 Transmission Flush on 4.0L YJ

Just finished Installing a 4.5in RE Lift, SYE and rear drive shaft. Noticed after i took the Transfer case off how moggy the fluid from the AX-15 transmission was. I paused putting the transfer case on and want to do a Flush. How easy is it to do? Any help is appreciated.

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Old 12-09-2012, 04:29 PM   #2
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idk how you would "flush" a manual transmission, as there are no pumps on the trans, however, it is probably due for a change, mind you that is gear oil in there, not trans fluid, all you do is first make sure you can open the fill plug on the trans, then open the drain and let it drain, there's a walk through somewhere on here on what all you need and the locations of these plugs...also good recomendations for what fluid to use

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Old 12-09-2012, 04:35 PM   #3
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Thanks for the recommendation. time to go hunt for that info.
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Old 12-09-2012, 04:51 PM   #4
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Do I really need a flush manual if the TC is already off and fluid is draining out the rear end of the tranny.
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Old 12-09-2012, 06:22 PM   #5
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Im in the middle of doing all fluids Tranny, Transfer & diffs.I talked to a local tranny builder and explained the jeep being new to me & I didn't get any info from PO on anything.He recommended to drain & fill the tranny & transfer and then run it 5-10 miles and then do another drain & fill.Dont know if this makes sense or not but Im going to do it.Good luck
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Old 12-09-2012, 09:38 PM   #6
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motor oil or gear oil when you refil?
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Old 12-09-2012, 11:37 PM   #7
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I just completed my transmission flush due to mucky gear oil. I also had a rear seal leaking on the trans that was found while doing the clutch. I did some research and found that you can use full synthetic 10w30 motor oil it is the same viscosity as the mt90 gear oil. I did the change and the trans feels much better.
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Old 12-10-2012, 11:28 AM   #8
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Either use 10W-30 motor oil (synthetic or conventional, doesn't matter) or a full synthetic 75W-90 gear oil (Royal Purple, Redline, Amsoil, etc.) when you fill it back up.

The drain plug is on the passenger side (not too big a deal since you're draining it via the rear). The fill hole is on the driver's side. Get one of the those cheap transfer pumps that screw to the top of bottles and filler her up 'til fluid starts leaking back out of the fill hole.
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Old 12-11-2012, 09:07 PM   #9
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Quote:
Originally Posted by Mitchness View Post
Either use 10W-30 motor oil (synthetic or conventional, doesn't matter) or a full synthetic 75W-90 gear oil (Royal Purple, Redline, Amsoil, etc.) when you fill it back up.

The drain plug is on the passenger side (not too big a deal since you're draining it via the rear). The fill hole is on the driver's side. Get one of the those cheap transfer pumps that screw to the top of bottles and filler her up 'til fluid starts leaking back out of the fill hole.
I'm running 10w-30 synthetic past 3yrs, no problems here.
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Old 12-12-2012, 06:57 PM   #10
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Just got my 89yj back after all fluids changed, used10-30syn. in tranny and it shifts much better.

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