[Biglambo0123]

I have an 03 s10 that makes a slight knocking noise under acceleration, this only happens when I “hard” start around 1.6k rpms we recently took the rear end apart and replaced the axle bearings and the carrier bearings. And just recently we replaced the hangar bearing for the driveshaft. I know it’s not the engine cause I put it in park and neutral and got it to 3k rpms and no noise. What else could be making this noise? It didn’t start until around 240k miles everything is bone stock. I read on another forum where another guy had the same problem and it ended up being the exhaust knocking somewhere when he accelerated but I just got under my truck and shook the exhaust and it didn’t hit anything. Any help is appreciated. Thank you

 

[Biglambo0123]

I have an 03 s10 that makes a slight knocking noise under acceleration, this only happens when I “hard” start around 1.6k rpms we recently took the rear end apart and replaced the axle bearings and the carrier bearings. And just recently we replaced the hangar bearing for the driveshaft. I know it’s not the engine cause I put it in park and neutral and got it to 3k rpms and no noise. What else could be making this noise? It didn’t start until around 240k miles everything is bone stock. I read on another forum where another guy had the same problem and it ended up being the exhaust knocking somewhere when he accelerated but I just got under my truck and shook the exhaust and it didn’t hit anything. Any help is appreciated. Thank you

P.S it is a 2wd not a 4wd

 

[Rebel n Dirt]

Try higher grade of fuel.

 

[Biglambo0123]

Try higher grade of fuel.

If you don’t mind me asking, how does a higher fuel grade make something in the rear end stop knocking?

 

[Rhotpursuit]

If you don’t mind me asking, how does a higher fuel grade make something in the rear end stop knocking?

It may not be the rear end at all. Putting a vehicle in neutral and roving to 3K, is different than an engine under a load.

 

[Rebel n Dirt]

If you don’t mind me asking, how does a higher fuel grade make something in the rear end stop knocking?

It's my dyslexia I could not see the "not" when you were referring to the engine. To me the statement said "I know it’s the engine cause I put it in park and neutral and got it to 3k rpms and no noise." Which said to me the engine doesn't do it when not under load, and detonation is really common under load. My bad on that one.

So on to the rear end making noise. A couple things can do it. If it is a G80, then it could be coming apart. If it is not a G80 then pinion bearings could be worn. The U-Joints can also cause this, you didn't mention if they were replaced. Lastly did you get the pattern right on the ring gear, and also the lash correct? Those will also cause noise.

 

[Biglambo0123]

It's my dyslexia I could not see the "not" when you were referring to the engine. To me the statement said "I know it’s the engine cause I put it in park and neutral and got it to 3k rpms and no noise." Which said to me the engine doesn't do it when not under load, and detonation is really common under load. My bad on that one.

So on to the rear end making noise. A couple things can do it. If it is a G80, then it could be coming apart. If it is not a G80 then pinion bearings could be worn. The U-Joints can also cause this, you didn't mention if they were replaced. Lastly did you get the pattern right on the ring gear, and also the lash correct? Those will also cause noise.

its not a g80 and we didnt replace the u joints because when we had the driveshaft off a couple days ago they didnt look bad and when we took the rear end apart we just took the carrier out and when we put it back in we spun the driveshafy around a couple times and all the teeth looked good

 

[Rebel n Dirt]

OK so now I think I see the problem. With replacing the bearings on the carrier, any time the carrier is removed, it should be tested for the wear pattern on the gears and also for lash. New bearings usually means new shims, and if you replace the pinion bearings then the pinion depth and preload need to be adjusted and set properly too.

 

[oldeerslayer]

At 240K might be easier to find a 125K rear end to swap into it.

 

[Biglambo0123]

At 240K might be easier to find a 125K rear end to swap into it.

It only has 142k on it, that was a mistake on my part

 

[Sprocketrocket55]

U-joint noise?

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