Yea, mine did the same thing about 7 or 8 years and I was lucky to find an article showing the same test. Not sure why I didn't check the manual but,,,, I replaced the TCU and it worked fine,,,,until now. Trying to figure out why I can't get it to downshift when traveling at cruising speed. Problem happens when trying to go from OD to 4th and sometimes from 4th to 3rd. It changes from 1st to 4th then OD with no issues but if I try to speed up (floor it), the engine will rev up but it won't downshift. It passed all the tests so far and I'm dreading replacing it but I know that's what is coming.
informative for sure my trans is doing kinda the same thing as i travel down the road so i pull over shut down and im good to go for a few miles sometimes it totally goes away and returns
Hey, did you use the same exact part # tcu? Having the same issue, but can’t find a tcu with the same part number available. Was trying to see if they were interchangeable. Thanks
And that worked for you 91??... I have the same car 91 n.a and can't find 44900 can another work? 40901 or 54p05 or 45p20.. I found those models online..
My 300zx is auto as well (1991) but instead my problem is it will only shift when I let off the gas. I’ll get up to about 3.1k rpm’s let off the gas and that’s when it’ll shift. Any idea if this could be the TCU ?
@@RevampMotorsno I’ve tried that. It only shifts when I let off the gas. No matter if I’m in Drive, 1 or 2. If I don’t let off the gas it won’t shift and that goes for every gear
@@RevampMotors I will have to check it here in a hour or so . Getting an alternator put on at a local shop. Just didn’t know if a different part number worked fin place of another before I order one from Z1 or eBay
@@RevampMotors yes theyre all fine currently the car wont shift unless i push the shiftlock button but then when i put it in drive or reverse it wont move like the reverse lights come on but nothing and i can put it in neutral and roll it ive been trying to figure out whats wrong for the past 2 months and im clueless
Yea, mine did the same thing about 7 or 8 years and I was lucky to find an article showing the same test. Not sure why I didn't check the manual but,,,, I replaced the TCU and it worked fine,,,,until now. Trying to figure out why I can't get it to downshift when traveling at cruising speed. Problem happens when trying to go from OD to 4th and sometimes from 4th to 3rd. It changes from 1st to 4th then OD with no issues but if I try to speed up (floor it), the engine will rev up but it won't downshift. It passed all the tests so far and I'm dreading replacing it but I know that's what is coming.
Sounds like a torque converter issue
My z32 wont shift to reverse, could this be a possible fix? Or an internal transmission problem? Drive works fine.
Sounds like an internal problem with the transmission
Did you ever find out the problem I have the same issue
@@luisadame5942 yeah i ended up replacing the whole transmission, maybe it was the torque converter but im not sure
informative for sure my trans is doing kinda the same thing as i travel down the road so i pull over shut down and im good to go for a few miles sometimes it totally goes away and returns
Might be a connection issue, or it's losing power somehow
Having a similar issue. This video helps !
That's great! I am glad it helped
Thank you, that fix my car and another guy that posted that he had a similar problem. I gave him your video link and problem solved.
That's awesome, glad I could help!
Hey, did you use the same exact part # tcu? Having the same issue, but can’t find a tcu with the same part number available. Was trying to see if they were interchangeable. Thanks
I will look, but I don't think it is the same. The TCU I put in was from a 91 2+2
@@RevampMotors awesome thanks for the reply. What year was the 300zx you put the 91 2+2 tcu into?
@@lisahunter5675 1990
@@RevampMotors thank you!
I'm looking at a 300zx with trans problem from what the owner is saying. might take a chance and buy it and replace the tcu and hopefully it works out
Part number for the TCU?
31036-44p00
And that worked for you 91??... I have the same car 91 n.a and can't find 44900 can another work? 40901 or 54p05 or 45p20.. I found those models online..
@@arronreynolds3170 I can't imagine them being much different as long as they are from the same model year.
My 300zx is auto as well (1991) but instead my problem is it will only shift when I let off the gas. I’ll get up to about 3.1k rpm’s let off the gas and that’s when it’ll shift. Any idea if this could be the TCU ?
Will it shift normally if you put it in low, 2 then Drive?
@@RevampMotorsno I’ve tried that. It only shifts when I let off the gas. No matter if I’m in Drive, 1 or 2. If I don’t let off the gas it won’t shift and that goes for every gear
@@DC5JOSH does it pass the tests I showed in the video?
Are the part numbers interchangeable or only the ones that have the same part number for your car will only will work?
Which part do you have and what is it from?
@@RevampMotors I will have to check it here in a hour or so . Getting an alternator put on at a local shop. Just didn’t know if a different part number worked fin place of another before I order one from Z1 or eBay
@@RevampMotors my oem has part number 31036-33P10 on it
@@jeremythompson6822 let me check tonight
@@RevampMotors ok thank you so much
My 93 Z32 NA Auto shifts hard between first and second wonder if this would fix it!!
Worth a try, it's easier to replace the module than to pull the trans and rebuild it
Nice one rj...❤
Great Video ! Nice thumbNAIL !
I'm glad you like it
@@RevampMotors hell ya
1990 nissan 300zx na a/t can't find any for sale. Part number 31036 33p11
A64-000 m48
9x07
Are any interchangeable
90-95 should work
Somebody help, my 1990 z32 doesn’t engage in drive, but will move in 1st and 2nd
Did you go through the diagnostic steps?
im not getting any voltage out of 9 any clue why that could be
Let me check on this tonight and get back with you
did you check the fuses?
@@RevampMotors yes theyre all fine currently the car wont shift unless i push the shiftlock button but then when i put it in drive or reverse it wont move like the reverse lights come on but nothing and i can put it in neutral and roll it ive been trying to figure out whats wrong for the past 2 months and im clueless
You're going to have to trace the wiring down and see if there is a break somewhere.
@@RevampMotors a break? like a cut in the wire kr smt?
No board in front of the electronics equals weight saving :)