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Old 08-26-2009, 05:48 PM   #1
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changing tranny fluid

Ok, so I've got a 2005 six speed and it has been acting a little strange in the last week. It hasn't been shifting right it seems and has been kind of grinding going into the lower gears, so I figured that I should change the fluid. It has alomst 60,000 on it and it doesnt look like it has been changed before. What kind of fluid would you suggest? I am also still trying to figure out how to make it run a little smoother. At idle it runs a little rough. I've cleaned the IAC, but it didn't change anything. Thanks

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Old 08-26-2009, 07:00 PM   #2
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I'm not familiar with the drain and fill plug locations on your particular tranny but Royal Purple Synchromax is a good synthetic gear lube that meets its specs. If the Royal Purpole is a little too spendy, Synchromesh from either GM or Pennzoil is a good mineral-based version gear lube that also fully meets its specs.

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Old 08-26-2009, 07:04 PM   #3
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Thanks, is the royal purple better, or is it just the synthetic vs. dyno arguement?
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Old 08-26-2009, 07:14 PM   #4
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I'm no synthetic fan but in the transmission, it seems to make sense. I only use synthetic in my power steering pump, tranny and transfer case because they don't get their lubes changed that often. I use ONLY mineral-based gear lube (Torco from Currie) in my axles and mineral-based motor oil.
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Old 08-26-2009, 07:23 PM   #5
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Ok, sounds good. Does anyone know how much it takes? Can I but two bottles or do I have to get three?
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Old 08-26-2009, 09:18 PM   #6
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It's less than 2 quarts. 3.17 pints to be exact.

So pick up 2 quarts.
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Old 08-27-2009, 09:06 AM   #7
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Just changed the fluid in my '05 6-speed (NSG370) last night. Refilled with Royal Purple Synchromax, per all the recommendations on this board and JF. Shifted out fine this morning. Not really noticeably better, but now I KNOW it has some good, fresh stuff in it.

The drain plug is just before the skidplate. It is a 17mm Allen head.
The fill plug is near the drainplug on the passenger side side of the tranny. It is a 14mm Allen head. (Harbor Freight has a cheap set of large Allen head sockets.)

Capacity ~1.5 qts as mentioned earlier. Be sure to clean the magnetic drain plug. Very easy job.

Also, new plugs made mine (85k miles) run MUCH better. Champion 7034 or Autolite APP985 (as recommended by Jerry).

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