The transmission in my car has always annoyed the hell out of me. One day i was bored and looking through TSBs for my car and came up with this:

"Classification:
AT001-004a

Reference:
ITB00-028a

Date:
December 4, 2000

2000-01 I30 A/T SLIPS FROM FIRST TO SECOND OR SECOND TO THIRD GEAR

If an applied vehicle exhibits slow or delayed shifting from first to second gear or from second to third gear (particularly at one-half throttle or greater application) refer to the Service Procedure listed below to properly diagnose and repair the vehicle."

Now there is this whole write up on All data about first changing the fluid which i've done before then goes into replacing the TCM, then working on the solenoid valve assembly. Now I cant find the other TSB thats similar, but its titled: "Car seems like its searching for gear." My car does this as well. Just wondering how many other people have heard about this or have modified their trannys to drive half way decent. THANKKKKKKKKS

I see the following:

Make: NISSAN Model: MAXIMA Year: 2000
Service Bulletin Number: NTB00039B Bulletin Sequence Number: 199 Date of Bulletin: 03/01
NHTSA Item Number: SB620000
Component: POWER TRAIN
Summary: SOME VEHICLES MAY EXHIBIT DELAYED SHIFTING FROM FIRST TO SECOND GEAR OR FROM SECOND TO THIRD GEAR (PARTICULARLY AT ONE-HALF THROTTLE OR GREATER APPLICATION). *TT

Make: NISSAN Model: MAXIMA Year: 2000
Service Bulletin Number: NTB00039D Bulletin Sequence Number: 625 Date of Bulletin: 09/01
NHTSA Item Number: SB625508
Component: POWER TRAIN:TRANSMISSION:AUTOMATIC
Summary: SOME VEHICLES MAY EXHIBIT SLOW OR DELAYED SHIFTING FROM FIRST TO SECOND GEAR OR FROM SECOND TO THIRD GEAR. *TT

Maybe someone will have the actual TSB's but it seems the first one, NTB00039B, replaced shift solenoid 85X03 with 85X04. Other than that I really could not find more information without a alldata sub.