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Old 06-06-2013, 07:42 PM   #1
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Transmission Oil?

Getting a used transmission soon! What should be done to the tranny before installation? What is a good oil to use in the transmission and how often should you change it ?

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Old 06-06-2013, 07:46 PM   #2
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Old 06-06-2013, 07:59 PM   #3
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Thanks....
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Old 06-06-2013, 08:11 PM   #4
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Auto? 5 speed? I just used synthetic 10w30 motor oil in my 5 speed
And the forum is your friend ask away regardless of your questions we are all amigos here
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Old 06-06-2013, 08:22 PM   #5
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Its a 5 speed manual. I also heard you could use Pennzoil syncromesh oil, is that true?
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Old 06-06-2013, 08:25 PM   #6
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Yeah some some guys here run it I never have but with the motor oil which the manufacture now recommends shifts so smooth
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Old 06-06-2013, 08:41 PM   #7
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Does the motor oil ruin the syncros?
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Old 06-06-2013, 08:44 PM   #8
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Nope from what I have read the original factory recommended fluid for the 5 speed is the kind that destroys the synchros I think its gl4 or gl5 fluid I'm not sure but now they say synthetic 10w30 is best I think it's cheaper too
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Old 06-06-2013, 09:00 PM   #9
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What is GL mean?
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Old 06-06-2013, 10:49 PM   #10
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Originally Posted by 1993Jeepfun View Post
What is GL mean?
Gear Lubricant
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Old 06-07-2013, 06:02 AM   #11
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My YJ has bad syncros between 3rd and 4th on downshift...I knew this when I bought it. I drained the fluid, flushed with 10w30 and drove 20 miles.....it was rougher shifting, I re filled with Syncromesh and it is now shifting better to where if I am careful there is rarely any gear grinding. I suspect I will be doing a reman tranny replacement at some point.
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Old 06-07-2013, 08:04 AM   #12
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I have bad synchros so I switched to the redline mt-90 smooth as butter now despite all the brass shavings when I drained the 10w-30 out. It's pricey but putting off my tranny swap until I can't run with the top down is priceless

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