Quote:
Originally Posted by DirtyLarry
Yeah, I had 5th gear issues where getting it into 5th was like getting in an arm wrestle with the shift lever. Also had them where 5th gear screamed like crazy. NV4500’s are weird because some make more “normal” noises than others. Curious how many NV4500’s you’ve driven to compare this as a normal characteristic or something out of the ordinary. NV4500’s are finicky!
Funny you should bring this up as I just got a reman NV4500 for the Polar Bear about 3 weeks ago. The new one shifts fine but it makes a huge racket in 5th gear…not under acceleration or coast but a coast with a slight tip in of the throttle. Hard to explain the noise but it sounds like something inside is loose. The closest thing I’ve ever heard to a noise like this is when the idler gear in the NP205 in the K10 was loose and would bounce around under a slight tip on of the throttle on a partial coast when the gears are somewhat relaxed. I’ve been going round and round with the reman company where they said “No problem….ship it back and we’ll take a look”. And I’m like nooooo…..you guys send me another one so I don’t have to have my shop plugged with the Suburban for 3 weeks while this one gets shipped back, they take a look/fix then ship it back. They aren’t willing to send me another unless I pay for it then they will reimburse me once they tear into it and confirm a defect on their part. That leaves me in an awkward position with $1000 on the line hoping they will be honest and own up to an issue rather than pull some shenanigans that reman companies are famous for pulling. I guess they’ve been burned before where they won’t ship anything until they confirm the issue is theirs and not an installation error. There is no error even a moron could do with the installation that would cause this noise other than something went wrong during their rebuild. Very frustrating.
I tell ya, I am done with NV4500’s after this mess gets resolved. The next NV4500 that dies in the K10 or this burb is getting replaced with something else even if it is an automatic. Tremec makes an equivalent transmission to a NV4500 (similar dimensions, same input and output spline size and counts) that is used in Mexican and South American market GM trucks but we never got them in the US. Tempted to see what it would take to get one of those…..or just go 4L80E next go around. I’m in a real bad mood about NV4500’s lately  |
Sorry to hear your having sucl trouble from the transmissions. This is actually the first NV4500 I have driven. The shifts are great. I have no problem grinding during shifts or anything like that. It's a funny noise like a light pinging/rattle. It's not extremely loud. Makes me wonder if it might be normal noise. The last time I drove it I could not get it to duplicate the noise. I'm getting ready to change the oil in it (ouch $$$), lol. I've read somewhere to add an extra quart through the shift tower to properly lubricate the input bearing. After I change the oil I will just drive it and see what happens. I have to admit you have me a little worried about the NV4500. I was excited about it until your last comment, lol.