Last post on Sep 28, 2009 at 9:52 AM
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Oldsmobile Silhouette, Pontiac Montana, Chevrolet Venture, Auto Repair, Van
#1 of 1 Growling on hills in 3rd and 4th gear
Sep 28, 2009 (9:52 am)
2000 Olds Silo, 121k miles. Interesting problem from our summer vacation. Pulling hills under 50mph in either 3rd or 4th gear, I hear a systematic pulsating growling/grinding noise, very similar to driving over evenly spaced out rumble strips on the road or intermittent dozer tracks on the road. In fact, I dismissed it at first thinking we were in fact driving over dozer tracks (we were on a backroad when I first noticed it).
It feels like I'm driving of those things too, I can feel it in the floor thru my feet, not really noticeable in the steering wheel though. RPM needle rises slightly (250rpm or so) when the noise occurs, then drops back down when the noise goes away. Seems like a drag is being created on the engine and the engine revs slightly to compensate. Tranny's not slipping tho, or at least not what I would think of as slipping. Goes away completely if I downshift into 2nd or if the RPM is really high. Not there at all over 55mph or so. It also doesn't seem to want to shift properly between 3rd and 4th on hills, mostly at highway speeds but sometimes at lower speeds too. I guess it's what they call fish bite or something like that, just a slight tug that shouldn't be there and wasn't there before. Now that I'm back in FL on flat roads, there are no symptoms, everything seems fine and normal.
4th gear spline replaced with tranny rebuild around 85k miles. Called the tranny guy, he had no clue, told me 1st and 2nd gears are usually problems on the Silo. Only thing I can figure is problem in the tranny. Could it be electrical unrelated to the tranny? Tranny guy just told me to take it easy and keep an eye on it.
Anyone have any thoughts or experience with this problem?