help me with my daughter's car - roaring from trans area
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Joined: Jul 2006
Posts: 12,204
Likes: 10
From: Gainesville, Ga.
ok, spent the afternoon experimenting and listening to different areas.
as far as fan clutch... with engine running and transmission in park, i rev'ed the motor up to 1000, 2000, 2500, 3000. no unusual noise. its not the engine.
test drive. starts roaring at about 20mph, with slow roar - roar - roar, climbs steadily in pitch as you get faster. gets good and loud at about 40-45. i manually shifted the auto trans. it roars in all gears, all engine rpms. it has a little change in pitch between acceleration vs deceleration, but it roars both ways. i don't think the cause has anything to do with engine, rpm, TC, nor transmission gears. the roaring does not change at all with engine speed nor gear changes. its tied completely to final drive line speed. it sounds like mud grip tires...
next i put it up on jack stands.
checked u-joints, trans in neutral. seals on u-joints all intact. everything good and tight, no wiggle movement. i think they're fine.
still on jack stands. ran it at different speeds and accelerations in both forward and reverse. as best i can tell, the noise is all coming from the rear differential, and sounds to me like its in the pinion area. the sound is loudest and harshest when you accelerate up to speedo=60ish/coast, accelerate/coast. i listened with my ears, a pipe, stethoscope, hands. its really hard to pin it down, because the noise runs up the entire drive shaft all the way to the tranny output, but its definitely louder at the pinion area than anywhere else.
ran it some in reverse. there's some noise, but its not quite as bad.
checked for rear end ratio. i measured it at about 3 3/4 (3.75). looked up the stock offering and its 3.72
so i don't really know exactly what it is, but it seems like its all rear end related. the nice thing is that the toyota rear end is like the ford, where its a 3rd member that bolts in from the front, and that looks reasonable simple. i'm also thinking that although it will probably keep getting louder, it'll probably keeping running, and there's no emergency fix required.
so i've been over on the toyota forums, but since its a 97, i can't figure out whether its a 7.5, 7.8, 8.0, v6/turbo, or what damn rear end it is. it looks like reman's are pretty expensive at 400-900, depending on which model it is. but, i'm guessing that at 200k miles, the gears and the bearings are probably all worn out. i think i'll do a little junk yard shopping for a differential assembly...
suggestions welcome
as far as fan clutch... with engine running and transmission in park, i rev'ed the motor up to 1000, 2000, 2500, 3000. no unusual noise. its not the engine.
test drive. starts roaring at about 20mph, with slow roar - roar - roar, climbs steadily in pitch as you get faster. gets good and loud at about 40-45. i manually shifted the auto trans. it roars in all gears, all engine rpms. it has a little change in pitch between acceleration vs deceleration, but it roars both ways. i don't think the cause has anything to do with engine, rpm, TC, nor transmission gears. the roaring does not change at all with engine speed nor gear changes. its tied completely to final drive line speed. it sounds like mud grip tires...
next i put it up on jack stands.
checked u-joints, trans in neutral. seals on u-joints all intact. everything good and tight, no wiggle movement. i think they're fine.
still on jack stands. ran it at different speeds and accelerations in both forward and reverse. as best i can tell, the noise is all coming from the rear differential, and sounds to me like its in the pinion area. the sound is loudest and harshest when you accelerate up to speedo=60ish/coast, accelerate/coast. i listened with my ears, a pipe, stethoscope, hands. its really hard to pin it down, because the noise runs up the entire drive shaft all the way to the tranny output, but its definitely louder at the pinion area than anywhere else.
ran it some in reverse. there's some noise, but its not quite as bad.
checked for rear end ratio. i measured it at about 3 3/4 (3.75). looked up the stock offering and its 3.72
so i don't really know exactly what it is, but it seems like its all rear end related. the nice thing is that the toyota rear end is like the ford, where its a 3rd member that bolts in from the front, and that looks reasonable simple. i'm also thinking that although it will probably keep getting louder, it'll probably keeping running, and there's no emergency fix required.
so i've been over on the toyota forums, but since its a 97, i can't figure out whether its a 7.5, 7.8, 8.0, v6/turbo, or what damn rear end it is. it looks like reman's are pretty expensive at 400-900, depending on which model it is. but, i'm guessing that at 200k miles, the gears and the bearings are probably all worn out. i think i'll do a little junk yard shopping for a differential assembly...
suggestions welcome
Veteran
Joined: Aug 2007
Posts: 420
Likes: 1
It's most likely a 8", V6 diff...
You can tell by how many "ribs" there are on the side of the 3rd. I can't remember how many are for each... but a google search should yield some results.
You said it was two wheel drive right? So you don't have to worry about matching a set of gears in the front... I would think you would be able to find a used one on craigslist for a pretty decent price...
I would imagine you already checked... but you might want to check the fluid level too. Toy's should have a fill plug at the top so that you can fill/check the fluid level...
Good luck,
Cartman
You can tell by how many "ribs" there are on the side of the 3rd. I can't remember how many are for each... but a google search should yield some results.
You said it was two wheel drive right? So you don't have to worry about matching a set of gears in the front... I would think you would be able to find a used one on craigslist for a pretty decent price...
I would imagine you already checked... but you might want to check the fluid level too. Toy's should have a fill plug at the top so that you can fill/check the fluid level...
Good luck,
Cartman
