my max is up to 125k miles now. the transmission is jerking noticeably on the 1-2 shift, but its not slipping like other people are complaining about. other than the jerky shift the transmission feels pretty decent. what do you guys think the issue is? and at mileage is everyone getting their auto's rebuilt?

 

i got 112000 miles my car and the tranny jerks too, i found out its normal and not a problem.

 

Check your Throttle Positioning Sensor. A few years back, resident DIY mechanic Daniel B. Martin came to the conclusion that this was the cuplrit for a jerky 1-2 upshift over time.

 

mine has about 133K on it and i jsut got a tranny with 30K on it. when i floored mine the RPM would redline and the mph wouldnt go up at all

 

mine has 87k and jerks first to second and second to third. calmed down a little with screen and fluid change. i have a code 1205 line preesure solenoid , could this be it and how do i fix?

 

possible coil pack issue? When was the spark plugs changed ? Are you using plugs with the correct gap? Hopefully their not bosch. I know that i have coil packs that are intermittent and do the same exact thing sometimes i would floor it the car would stutter, then proceed but go up very slowly.

 

this is more of a bang when it shifts not a lack of acceleration. i let up on the throttle thinking ill do less damage. maybe my mounts are bad,why are they so expensive

 

check the flex section on your y pipe stock or aftermarket if its ripped, its your motor mounts. Also i had a huge banging noise in my car to on my old engine they replaced the water pump and forgot to put the passenger side front motor mount bolt in and it was banging real hard.

 

i would just swap out the solenoids......they cost about 150 for all of them and a tranny shop could probably throw them in, in about 30 min

 

it doesn't feel like motor mounts or coil packs. it definitely feels like the transmission is just shifting hard. would this cause more damage to the transmission than it slipping? i was thinking its almost like a strengthened valve body with no delay between shifts, so maybe it'll last longer than it slightly slipping for smoothness. or not.

 

I paid $350 so my car could shift hard from 1st to 2nd to 3rd! Valvebody mod, of course. Can be a little annoying at times (like when you are driving slowly in normal traffic and the car jerks a little with the 1-2 shift, especially when carrying passengers who think my tranny is doing wierd things).

Hard shifts won't hurt the tranny. Slipping will. Of course, if the hard shifts are a new thing, that sounds kind of fishy...

How much different is it from before? Does it really BANG into gear or just shift a little bit hard?

 

ive had the vb mod on my car for over a year now and have about 160k miles. tranny still shifts strong with it. before the vb mod my 1-2 was hard and annoying 3-4 was so so. i only really did the vb mod to improve life of the tranny and so far it has worked. my mechanic who works at nissan says as these cars get older they shift much harder but he said he hasnt seen many come in blown

 

Check the drop resistor, its located on the front of the drivers side strut housing. Check resistance, should be approx 12 ohms, also check wiring and connector.

If this resistor is not working it causes the transmission to shift at full line pressure, its ok for WOT but shifts really hard at part throttle. Over time it will probably cause damage.

 

i would still check the dropping resistor, line pressure solenoid, fluid level or tps also check your tranny codes for anything. not much else can cause hard shifts other than a tranny that is on its way out

 

i have the hard jerking shift from 1 to 2 too. what i do is drive very slow and let the auto transimission shift like a stick shift for a couple of miles. just let the gas go and let is shift smoothly into 2nd gear. after couple of miles, mine starts to shift normally.

 

If it is slamming on the 1-2, I would also suspect the resistor. If you have a volt meter, it's easy to check. I have had two of them go out in 8 years. Last time was last fall (at 150,000 now have 180,000). It's like $55.00 at a local Nissan dealer. The change over takes about 5 minutes or less once you have the part in hand. Mine is acting up (the slippng syndrome)and I suspect the coil pack(s) too. Should know later this week

 

I also have harsh shifts from 1 - 2. Ive ruled out the resistor with mine cause I unplug it and the shifts are harsher from 1 - 2 and somewhat hard from 2 - 3. It is a similar feeling but harsher. It also feels smoother the higher the rpms are. Another weird thing is one time I did not plug in the tps properly, left it a little loose, the shifts became so much harsher!! Same exact feeling but so much worse.

 

this is interesting. so what exactly did Daniel do, change the throttle positioning sensor.

 

The trans temp sensor will also make it shift harder, same as the drop resistor. Pin 33 on the TCM green wire. You can also check at the trans, 2 wire plug one black wire one green wire.

When ATF temperature is 20°C(68°F).Approximately1.5V
When ATF temperature is 80°C(176°F).Approximately0.5V

 

so what would make harder shifts...hotter tranny or colder tranny?

 

when the tranny is cold it will shift hard, or if u have alot of ppl in the car