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dewyboy
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| Posted: Mar 07 2010 at 7:58am | IP Logged
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I have two questions I was hoping someone could answer for me. 1.) What is the model/manufacturer of the 6 speed used in 2009 4.0 4x4 frontiers. 2.) My six speed is a little rough shifting especially from 1st to 2nd. Does anyone have wisdom on changing out the transmission oil to another brand? Is this a possible solution for improving the shift quality? When shifting from 1st to 2nd it seems to help a little bit if I let the shifter move to center before shifting into 2nd. Does this sound like the problem could be related to the shifter linkage or whatever it has and not the transmission/oil itself?
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frontierguy
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| Posted: Mar 07 2010 at 5:10pm | IP Logged
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My 08 is the same during the first shift of the day. With 3K miles on it, I changed the trans fluid with the recommended Nissan synthetic fluid(it's listed in your owners manual). I did take some of the free-play out of the clutch adjustment and make sure I have the pedal to the floor on that first shift. My truck is parked in a garage that is heated most times and it still does not shift correctly the first shift. Also getting the speed up for that first shift helps it slide in, but I don't like to rev a cold engine.
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dewyboy
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| Posted: Mar 21 2010 at 7:33pm | IP Logged
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I changed the transmission fluid to redline 50/50 mix of MTL and MT-90. May have helped the transmission slide into the higher gears a little better but shifting 1st to 2nd and 2nd to 3rd was still harsh with lots of feedback through the shifter if I didn’t time the shifts very good. I adjusted the clutch to take out some the free play and get more stoke (turned the clutch rod out 2 full turns). Seemed to make shifting better. I still get a little bit of feedback through the shifter when shifting 1st to 2nd and 2nd to 3rd but I think it has improved it. I may turn the adjustment out another half turn but I’m almost out of adjustment.
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frontierguy
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| Posted: Mar 21 2010 at 8:43pm | IP Logged
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Check your owners manual for the proper GL rating and viscosity. MT 90 may be a little too heavy even 50/50 with the MTL.
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'10 Altima SL
Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.
Nissan Technician 25 + years
2011 John Deere X720SE
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dewyboy
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| Posted: Mar 28 2010 at 9:04pm | IP Logged
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The book calls for 75W-85. It also states that 75W-90 can be used. Do you think a thinner fluid could help with the problem? A little update since last time, when cold 2nd gear is sometimes a no go (won’t shift into the gear) unless I rev match the engine and transmission (engagement is a little harsh but has not ground the gears at all). Once the transmission is warmed up I can shift from 1st to 2nd easier but it is still finicky and will shift with a harsh engagement if the rpms are not matched well during the shift. Strange enough (I guess) there really isn’t much of a problem when downshifting. Love the truck but the transmission seems like a POS IMO.
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frontierguy
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| Posted: Mar 30 2010 at 8:34pm | IP Logged
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I agree with the trouble free down shifting and the POS trans. Haven't had the time to dig into this concern or come up with a solution. Have you talked to your dealer? I would stick to the 75w-85 and be sure of the correct GL rating.
__________________
'10 Altima SL
Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.
Nissan Technician 25 + years
2011 John Deere X720SE
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dewyboy
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| Posted: Mar 31 2010 at 7:48pm | IP Logged
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I’m gonna drive it for a little while before I visit the dealer. Maybe it’s partially me but I doubt it. Maybe it’ll smooth itself out (I hope). Sometimes the way it shifts makes me think there is an interaction with the engine flexing on its mounts and how it shifts into gear (is there shifter linkage that could be moving with the movement of the engine?). For instance, during up-shifting the truck will seem to shift better if I push the clutch in with a little throttle left in the pedal so it revs up a tiny bit. If I kill the gas so the truck is engine breaking and then push in the clutch and up-shift it is usually rougher. Maybe I’m wrong but it seems to me that the movement of the engine plays a part in this. Thanks for the feedback frontierguy.
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frontierguy
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| Posted: Mar 31 2010 at 8:20pm | IP Logged
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It's not you, I just worked on an '01 Pathfinder with 128K and it shifted smooth as silk!!!! I don't know if the disc is hanging up on the input shaft, blocker rings in the trans not performing correctly???? Just haven't had the time to worry about it or dive into it, may need to call the Tech line guys and see if they have any reports of this concern from other techs, I'm sure that there is.
__________________
'10 Altima SL
Traded 08 Frontier for 16 Frontier SV CC Long box, quite an upgrade. I do miss the 6 speed and Dynomax ex.
Nissan Technician 25 + years
2011 John Deere X720SE
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dewyboy
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| Posted: Apr 25 2010 at 7:32pm | IP Logged
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Got a bug today to drive around in 4-wheel high. I didn’t try it for long but I think all the issues with rough shifts, shifter feedback, difficulty going into gear and all other irritating stuff no longer existed in 4-wheel. Went back to normal roughness once I kicked it out of 4-wheel. I’m going to try it again tomorrow morning when I have my normal cold and rough 1st shift of the day into second gear. Are there any known potential issues with the transfer case or transmission based on this observation?
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dewyboy
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| Posted: Apr 27 2010 at 7:19pm | IP Logged
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Well it wasn’t quite as dramatic of a change as I initially thought. 1st to 2nd shifts are definitely better but 2nd to 3rd is about the same. How long can a tranny go with non-audible but still able to be felt through the shifter grinding?
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Nissan Frontier Forums : Problems / Technical
Topic: 2009 6 speed rough shifting
