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02-11-2006, 05:45 AM
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#1
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Registered Member
Join Date: Oct 2005
Posts: 1,460
Country: United States
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What if I switch to Royal purple Synthetic ATF for my tranny?
What if I switch my tranny fluid to Royal purple Synthetic ATF. I have an auto. You guys know I've been experiencing problems with the tranny. Where the shifts are too soft and that my cousin messed it up. I've been told if the tranny has problems and switching fluids might make it worse.
Right now I'm using oem fluid called Matic D from nissan.
Also my mpg dropped from 28 and some change to low 27. That is per tank mpg.
What do you guys think?
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02-11-2006, 06:18 AM
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#2
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Registered Member
Join Date: Jan 2006
Posts: 19
Country: United States
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It's difficult to say if
It's difficult to say if changing fluids would fix the problem without knowing what it is. I've had transmissions I've switched to synthetics that shifted and performed better but they where working well to start with. Temps drop and they shifted smoother. Draining and filling with RP or another synthetic is expensive gamble to maybe fix the problem. You might want to solicite advice from a local transmission shop,or dealer? I'm not sure if it would apply to Nissans, but with old th350's and c6's and the like (old std us autos) we'd run racing transmission fluid from B&M or simular. It firmed up the shifts and cut down/eliminated slipping. We did it for performance and racing but I would think less slipping would aid mileage as well.
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02-11-2006, 06:50 AM
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#3
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Registered Member
Join Date: Oct 2005
Posts: 1,460
Country: United States
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I had the unit that controls
I had the unit that controls the transmission checked and there was no codes and it said everything is working, it's not the ecu, that is different.
I really feel the transmission slipping, I even have to press the gas more to get it to move. When I put the pedal to the metal the car accelarates significantly slower. My mpg went down by like 1.5mpg. I checked the tranny fluid and it still looks new. I had a tranny cooler on this car since 2004. The problem started last year when my cousin downshifted while driving on the freeway and put it in N while on the freeway then back to D. Last time fluid was changed was 12000 miles ago.
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02-14-2006, 02:58 PM
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#4
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Registered Member
Join Date: Jan 2006
Posts: 2,444
Country: United States
Location: Tiverton, RI
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slipping
Keep in mind that the filter in the tranny is probably doing its job and removing all the stuff that would dirty the oil. I think the automatics use hydralic pressure to release the clutches and springs to make them grab. That is how it gets locked up in park - no pressure all the clutches grab. If your clutches and bands are worn then they need to be adjusted tighter to properly grab - I think it is a simple adjustment once you take the bottom pan off. Changing the oil in a transmission that does not work properly is not going to help it any. Checking the filter may show some debre and it should be cleaned.
Check this site out.
http://www.familycar.com/transmission.htm
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02-14-2006, 08:14 PM
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#5
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Registered Member
Join Date: Oct 2005
Posts: 1,460
Country: United States
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We will see how taking out
We will see how taking out the fluid helped or not in the next tank. If I'm back in the 28mpg range then it's all good. If it's 27mpg then I got problems.
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02-14-2006, 08:25 PM
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#6
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*shrug*
Join Date: Sep 2005
Posts: 6,195
Country: United States
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Give it at least a few
Give it at least a few tanks. My mpg fluxuates 2-3 mpg every tank not changing anything.
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02-15-2006, 05:47 AM
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#7
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Registered Member
Join Date: Nov 2005
Posts: 331
Country: United States
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JanGeo
Front Wheel Drive Automatics use a separate lock-pin/gear that stabilizes the vehicle in park. Nothing engages when the vehicle is in park as all the fluid valve bodys are depresurized. The drive axles & Diffential gears simply rest upon the lock-pin/gear assembly that the valve body engages as it gets shifted into park.
Also, the clutches grab ONLY under pressure. Clutches and Bands CANNOT be adjusted on a front wheel drive. Only on the old school rear wheel drives. And, Never simply clean a transmission filter. Always replace. (make sure you get a rubber gasket too, stay far away from them corks :P)
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"You have to know the truth, and seek the truth, and the truth will set you free."
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02-15-2006, 06:05 AM
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#8
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Registered Member
Join Date: Jan 2006
Posts: 2,444
Country: United States
Location: Tiverton, RI
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tranny
Seems my knowledge is dated - I stand corrected - thanks! After reading the article it also says everything is operated by oil pressure - clutches seem more complicated than I imagined also.
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02-15-2006, 07:28 AM
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#9
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Registered Member
Join Date: Oct 2005
Posts: 1,460
Country: United States
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ok, I'll see it over a
ok, I'll see it over a couple of tanks.
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02-15-2006, 02:14 PM
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#10
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Registered Member
Join Date: Jan 2006
Posts: 2,444
Country: United States
Location: Tiverton, RI
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shifting at highway speed
I asked my brother about shifting into neutral at highway speeds and then back into drive - he frowned for a few seconds and then said that should not bother the transmission as long as the engine was still running.
Maybe your cousin got a little reverse? before he found neutral...he said the changing of the oil might help but not likely.
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