Manual Transmission Fluid Type???
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Freshman User
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Manual Transmission Fluid Type???
I went down to my local Oriley auto parts today get some transmission fluid and they tell me that for my '93 f350 7.3L diesel manual 5 speed I should use dexron mercon. I did the fluid swap and now she shifts like hell! Does anyone have a prefrence or expierence with this???
Posting Guru
Joined: Jan 2001
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From: Poway, CA
I just checked the Chilton to make sure. It says Dexron II (Mercon) for all 5-speeds and 85w-90 gear oil for 4-speeds. Of course, being a manual tranny, it's probably not all that picky.
I've used the Royal Purple stuff before in several vehicles and always liked the results.
Mike
I've used the Royal Purple stuff before in several vehicles and always liked the results.
Mike
Lead Driver
Joined: Apr 2008
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I put type F in mine with some Slick 50. When i bought it i just knew it needed some type of atf, wonder how much it really matters. Any idea what was in there? synchros could be bad and the PO may have put some 10-30 or sae30 in there to help em out.
Cargo Master
Joined: Mar 2010
Posts: 2,227
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From: Higginsville, MO
i went to ford before i changed mine when i was told by some guys to use ATF in a manual trans. was told by ford to use Mercron 5 in the ZF-5 so i got valvoline mercron 5 and havent had a single shifting problem
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Thanks all may be some issues with trans then looks like I will be putting 10-30 back in her if it will help improve shifting
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Logistics Pro
Joined: Sep 2010
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From: Victor, MT
Dont fill it completely with 10-30.....it will make it really hard to do anything lol...that oil is a little thick to be used in a transmission that doesnt build a tremendous amount of heat like an engine does.
Logistics Pro
Joined: Sep 2007
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From: Western Mass
Old manual transmissions take thicker oils, newer ones take ATF.
hardwaterfreak, describe shifts like hell??
Aune163rd, does 1st work fine? Is reverse grinding the problem you're having? This could be the clutch not completely releasing or the pilot bearing dragging. The latter was the problem with my truck.
Lead Driver
Joined: Apr 2008
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If the trans has problems its clearences are obviously not as tight as they should be thus the use of heavier oil. 5-20 is about the same viscosity as atf, 10-30 would be a step up. The lighter oil is to help the trans stay cool due to it being aluminum case, same thing for alum. t-cases. Obviously if you put to thick of oil in, you go to the other extreme and you wont be able to get it into gear when its cold.