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Annoying grinding sound from gearbox around 4000+rpm

2K views 4 replies 3 participants last post by  santoro2020 
#1 ·
2001 Base 4x4 Auto

When I'm accelerating on a cold engine and get up to 60-75 mph, the gearbox makes a really strange and nasty grinding sound, and a humming one, too, they're deep-sounds, not really a whine as much as grind. I was wondering if this is good or bad or what I should do... Thanks.
 
#4 ·
It doesn't seem like it. I only can achieve such high RPM's when the engine is cold and its warming up. I don't know when the tranny fluid has been replaced. It *looked* good but I'm going to be replacing that once this damned Ohio weather warms up. Could that be a nice fix, should I look for anything while replacing the fluid?
 
#5 · (Edited)
To further explain "warmed up", I'm trying to say that when the engine is cold, it takes time shifting from 3rd-4th gear when I first drive it after letting the car sit for a while (2 hours avg. I'd say), I sometimes stick with a high RPM (3000-3500) for a good 30 seconds until the tranny kicks into 4th when I'm driving around 40-45 mph, it normally shifts when I ease up a tad amount on the gas.. And sometimes when I give it an inexessive amount of power due to going 0-70mph on an uphill onramp, it can reach 4000-4500 before it kicks into 4th. I've always thought this is because the components are cold and still need a bit of warm-up until everything works as intended. I hope this elaboration helps, once the car is warmed up, all shifting is fine, but the whine still comes up.

I can provide a video/recording of it tomorrow maybe.
 
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