Transmission Slipping

[Clyons0203]

Ive been working on the car a little bit. NO ECU codes. No transmission codes.According to previous owner, the car has been dealer maintained since he bought it back in 1993. Every service item has been done. The car is very very very clean for a 93 with 193k miles. He said the transmission started to slip so he drove it on home and let it sit.

Car will not shift because it cant build up enough speed to shift out of 1rst gear.

Start car up, move shifter to drive (rpms rev for like 2 seconds around 1500rpm then drop down to idle (car is now in gear), press on gas car barely moves and revs up.

Either the first gear clutch is completely shot, or the torque converter is shot, or its not building up enough pressure.

My money is on the torque converter. No codes, clean transmission fluid, dealer maintained, I think the torque converter just wore out.

What you guys think. I used the pedal and shifter sequence to make it spit out the codes. And used a nissandata cable to check the ecu for codes.

I wish i bought conzult instead so I could make the transmission do a self test.

I also did a torque break test. Put car in drive, foot on break, give car gas.......rpms just climb and climb

[Clyons0203]

1993 j30t by the way

[SteveTheTech]

With a 93 you are not likely to throw a code unless something like a sensor is open or shorted. They use very simple diagnostic logic and only have a few DTCS. If you performed the stall test and the rpms continued to increase that could indicate many things. I would highly suspect either low pump output pressure (there by not having enough pressure to hold the brake/band assemblies). Check your line pressure and perform the proper diagnosis. The AT section of the ESM read from page AT-13. This will give you all the information you will need to correctly condemn a specific component.

Are you planning on replacing the entire unit or tearing into it?

[Clyons0203]

I have a spare J30 transmission with about 80k on it. If the transmission is shot, I will just swap the other over.

If a certain component is shot and can be replaced without taking the transmission out I will do that.

Can the pump be replaced without taking the transmission out?

[Infinitiguy19]

Nope the transmission pump is inside the transmission, have you seen any with the pump some where else besides the bell housing?

[NJ 666]

Does it buzz or whine? If so prabably a pump. If your planning on keeping the car might as well do a T/C and lock-up solenoid. Some of the pump failures(more common on Qs) were caused by the T/C clutch material flaking off and contaminating the cooler lines and pump.

[maxnix]

Hence the twin heat exchanger tanks after the inline external ATF filter in 1994-1996.

Nissan remanufactured one includes TC and rebuilt solenoids. Installing a used transmission is just asking for repeat labor very soon again.

[Clyons0203]

It does make a whinning noise upon first start up. it goes away after the car is warm. its not the belts either, i checked those.

The car is in excellent condition. I went to dealer and they printed out the service history. 8 pages long, all common problems have been fixed such as, head light relay, antenna mast, 02 sensor, sunroof.... all common to the j30

Engine runs real smooth. If i planned on keeping the car i might would get a remanufacture transmission, but I only paid $600 for the car and a reman transmission is about $2500-$3000 I guess. More than the value of the car.

[NJ 666]

Hence the twin heat exchanger tanks after the inline external ATF filter in 1994-1996.

Nissan remanufactured one includes TC and rebuilt solenoids. Installing a used transmission is just asking for repeat labor very soon again.

Did that start sooner than 94? Or the ole P2200 campaign. Even added a cooler?

[maxnix]

Did that start sooner than 94? Or the ole P2200 campaign. Even added a cooler?

Yes, from 1991 on, different software, entire transmissions and cooler configurations were retrofitted or added at the factory. The 1994 configuration was the final solution for OEM.

Those of us who recognize the twin tanks as heat exchangers and not ATF coolers add B&M 70268 or 70264 or like, usually by passing the twin heat exchange fi present, but not always if one lives up north.

[Q45tech]

16 years is extremely long life for a RE4R01A transmission, are you sure it has not already been replaced. Usual life is 8-12 years max.

[Infinitiguy19]

Does it buzz or whine? If so prabably a pump. If your planning on keeping the car might as well do a T/C and lock-up solenoid. Some of the pump failures(more common on Qs) were caused by the T/C clutch material flaking off and contaminating the cooler lines and pump.

When you say whine do you mean like a turbo whine or something else?

[windowlikker]

I have a 1993 J30, 141k, with the same non-engaging, whiny transmission. It ran great, gave no warnings, no slippage, then I pulled into a driveway one day last week and it would no longer go into any gear. No load up, nothing.. At idle I can hear a whining coming from the bell housing area. The fluid is a little brown, could it be an internal pump? I'm just trying to find out the best solution, as the car is really nice, like the other guy's.. It'd be a shame to scrap it. Anyone with experience on the subject?? THANKS!!! -kyle

[Infinitiguy19]

If the fluid is a little brown the damage MAY be already irreversible.

You can go easy on the transmission if it has a lot of miles and your short on money: do 6 drain and refills.

Or get the transmission flushed at the dealer or someone who uses a BG machine.

[whistles]

same problem with my j30 na i got the transmission flushed and refilled at chevron tech center and right when i drove it home turned it off went to go to the movies and the transmission just kept slipping it will rev to 5k than go to second then just stay in second gear the whole time.... since this it has ben sitting in my front yard for about half a year.

[Q45tech]

My 3rd transmission on 1990 Q already has 100k since 2003. Just a common thing to change them as they fail.I have a oem rebuilt spare sitting and waiting for the funeral of #3.

[goody90q45]

same problem with my j30 na i got the transmission flushed and refilled at chevron tech center and right when i drove it home turned it off went to go to the movies and the transmission just kept slipping it will rev to 5k than go to second then just stay in second gear the whole time....

Were you having no transmission problems until the flush was done? Did you get the filter changed when the transmission flush was done?

Go to the AT section of your FSM and do the self-diagnosis procedure. It won't take more than a couple of minutes. If it points to a bad sensor follow the self-diagnosis test using a volt meter. If it all checks out try a quart of Lucas Transmission Treatment or Lubeguard Red. I've used both with great success on a few of my vehicles.http://www.nicoclub.com/FSM/J30/