Hey guys and gals, I was searching the site but I couldn't find any threads relating to what I am looking for. Is there any aftermarket parts or upgrades available for the automatic transmission in my 93 vert? I am rebuilding the transmission soon and wanted to "beef" it up a bit to make it stronger and better and in turn more fun to play around in. Any help would be greatly appreciated. Thanks in advance.
P.S. I can't swap for the manual because old sports injuries to my legs and ankles especially restrict me from driving a manual
Automatic Transmission Upgrades?
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jamesblonde82
- Posts: 789
- Joined: Mon Mar 20, 2006 7:00 pm
- Car: 1992 Nissan 240SX convertible RIP 5/10/07
1993 Nissan 240SX convertible
Re: Automatic Transmission Upgrades? (1sikvert)
when i redid my auto in my 92' i used pathfinder clutches. they are thicker. however doing this means nothing if your valves arent working correctly. if it was slipping a whole lot you should also replace them.
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ebalita
- Posts: 126
- Joined: Mon Oct 01, 2007 3:13 am
- Car: 1993 Nissan 240sx Limited Edition. 2018 BMW 440i GC, 2016 Subaru Forester
- Location: Burbank, California
Re: Automatic Transmission Upgrades? (jamesblonde82)
maybe a transmission cooler?
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jamesblonde82
- Posts: 789
- Joined: Mon Mar 20, 2006 7:00 pm
- Car: 1992 Nissan 240SX convertible RIP 5/10/07
1993 Nissan 240SX convertible
Re: Automatic Transmission Upgrades? (ebalita)
the autos have that from factory. but maybe a nicer one would be cool.ebalita wrote:maybe a transmission cooler?
Re: Automatic Transmission Upgrades? (jamesblonde82)
Thanks for the info guys. Have you heard of anyone perhaps putting 350Z cervos or anything of that sort in their transmissions? I'm just trying to think of some way to keep it automatic but give it that extra kick at the same time.
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DirftKing102
- Posts: 469
- Joined: Wed Dec 27, 2006 8:16 pm
- Car: Nissan 240sx 1993 convertable
Re: Automatic Transmission Upgrades? (1sikvert)
Sorry for stealing the thread. But so you can upgrade the auto transmission to a nicer transmission? Like what do you mean? So I could take out the old auto transmission and put in a new auto transmission and have it from a different vehicle to make it look cooler? An example: A infinite G35 auto transmission stick into a 240sx convertible. Would that work? I don't think it would, but i am just asking.
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slip69
- Posts: 1107
- Joined: Fri Nov 04, 2005 2:38 pm
- Car: 94 Nissan 240SX convertible
07 Dodge Charger
Re: Automatic Transmission Upgrades? (DirftKing102)
yeah know im curious about this too. and would it be cheaper than a 5 speed swap??DirftKing102 wrote:Sorry for stealing the thread. But so you can upgrade the auto transmission to a nicer transmission? Like what do you mean? So I could take out the old auto transmission and put in a new auto transmission and have it from a different vehicle to make it look cooler? An example: A infinite G35 auto transmission stick into a 240sx convertible. Would that work? I don't think it would, but i am just asking.
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guyaverage
- Posts: 224
- Joined: Thu Feb 19, 2004 9:48 am
- Car: Nissan 240SX Convertible
Re: Automatic Transmission Upgrades? (1sikvert)
I had a problem with my overdrive solenoid going out in my auto, so I picked up a used 240 transmission from a guy up north. When I pulled the pan and valve body it was obvious from the gaskets and innards this transmission had been rebuilt at least once (making the $40 price tag a bargain).
What was more obvious after dropping the valve body down was that the accumulator springs were either not stock, or were for some application other than a 240sx. Maybe a Pathfinder, or 300zx, or a pickup truck...? All of the springs were thicker than what came out of my 240, and the 1 gear accumulator actually had 2 springs (a smaller one within the larger).
I ended up swapping the entire valve body over, rather than just swapping the solenoid that I needed. I used the 'new' springs, and the double-springs for the first gear accumulator made the 1-2 shift much firmer. Not harsh like a shift kit, but definitely more firm than stock. The 2-3 and 3-4 shifts were more noticeably more firm too with the thicker springs, but not nearly as much as the 1-2.
Like I said, I dont know what application these springs were originally intended for. The RE4RO1A automatic is used in several different cars, Mazdas, Subarus, various Nissans, etc. so whoever rebuilt this one may not have intended it to go back into a 240. But if you can find out which application uses 2 first-gear accumulator springs, and thicker 2nd and 3rd gear springs, you can use those to firm up the shifts.
You can also replace the stock dropping resistor (which is used to limit line pressure) with one or two 100 ohm wire-wound power resistors you can get from Radio Shack (they look like this : http://www.radioshack.com/prod...earch) . This will increase the line pressure above stock and firm up the shifts. I did this for about 2 years with no ill effects before I went back to the stock resistor when I installed the thicker accumulator springs. (Using even a single 100 ohm resistor with the the thicker accumulator springs made 1-2 shift way too harsh).
Whatever you do, dont just unplug the dropping resistor and call it a day the way someone will inevitably suggest. It will firm up the shifts alright, to the point of being abusive to you, the transmission, driveshaft, rear end, and everything else.
What was more obvious after dropping the valve body down was that the accumulator springs were either not stock, or were for some application other than a 240sx. Maybe a Pathfinder, or 300zx, or a pickup truck...? All of the springs were thicker than what came out of my 240, and the 1 gear accumulator actually had 2 springs (a smaller one within the larger).
I ended up swapping the entire valve body over, rather than just swapping the solenoid that I needed. I used the 'new' springs, and the double-springs for the first gear accumulator made the 1-2 shift much firmer. Not harsh like a shift kit, but definitely more firm than stock. The 2-3 and 3-4 shifts were more noticeably more firm too with the thicker springs, but not nearly as much as the 1-2.
Like I said, I dont know what application these springs were originally intended for. The RE4RO1A automatic is used in several different cars, Mazdas, Subarus, various Nissans, etc. so whoever rebuilt this one may not have intended it to go back into a 240. But if you can find out which application uses 2 first-gear accumulator springs, and thicker 2nd and 3rd gear springs, you can use those to firm up the shifts.
You can also replace the stock dropping resistor (which is used to limit line pressure) with one or two 100 ohm wire-wound power resistors you can get from Radio Shack (they look like this : http://www.radioshack.com/prod...earch) . This will increase the line pressure above stock and firm up the shifts. I did this for about 2 years with no ill effects before I went back to the stock resistor when I installed the thicker accumulator springs. (Using even a single 100 ohm resistor with the the thicker accumulator springs made 1-2 shift way too harsh).
Whatever you do, dont just unplug the dropping resistor and call it a day the way someone will inevitably suggest. It will firm up the shifts alright, to the point of being abusive to you, the transmission, driveshaft, rear end, and everything else.
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bakgwailo
- Posts: 60
- Joined: Wed Oct 10, 2007 8:32 pm
- Car: '93 Nissan 240sx SE hatch, '93 Nissan 240sx SE LE Convertible, 94 Nissan 240sx SE LE Convertible
Re: Automatic Transmission Upgrades? (slip69)
Well, if its anything like the 300zx manual transmission swap, then, all you need is the transmission and the conversion plate. I would also assume that a 300zx auto transmission is like a 240sx auto transmission, in that most people throw them away/they are not worth much. But, you would probably want to rebuild it before the swap, new filter, torque converter, maybe valves/etc, so, it would probably end up being more than a 5 speed swap.