Popping in low speeds

[Brown Sugar]

My 83 Suburban started making a popping noise at very low speeds on a recent road trip. It only happens sometimes under 10 mph and worse in reverse. There isn't any vibrations or issues at higher speeds, only below 10 mph. Anyone have any ideas?

 

[HotRodPC]

Popping as in what? Backfire in the carb? Backfire in the tailpipe? Suspension? Under the truck?

 

[Driver4r]

Is it a hub sticking?? Ive had a hub go back and pop when turning.

 

[Brown Sugar]

Its in the driveshaft or the rear differential.

 

[Driver4r]

Well, spider gears slipping would happen at all rpm's, In our 91 K20, we wore the Idler Spiders down and it started popping at all the speeds, anywhere from 5-70. And it wasnt constant.

 

[Brown Sugar]

I think it's one of the u joints, but I don't have much experience in this area. I am going to remove the driveshaft anyway as I have a leak at my output seal that I need to replace. While I have it out I will go ahead and replace both of the u joints and see if that fixes it. Any knowledge that I can get beforehand is appreciated.

 

[HotRodPC]

I think it's one of the u joints, but I don't have much experience in this area. I am going to remove the driveshaft anyway as I have a leak at my output seal that I need to replace. While I have it out I will go ahead and replace both of the u joints and see if that fixes it. Any knowledge that I can get beforehand is appreciated.

You can replace U joints yourself if you have a decent bench vise. I've also used Old cheapass sockets for beating the old ones out. If they are original OEM joints and don't have inner or outter clips, then you'll need a torch to burn out the poly injected keeper material. That can be a bitch, but it can be done with patience. I've done with many with basic hand tools and a propane torch.

 

[89Suburban]

I think it's one of the u joints, but I don't have much experience in this area. I am going to remove the driveshaft anyway as I have a leak at my output seal that I need to replace. While I have it out I will go ahead and replace both of the u joints and see if that fixes it. Any knowledge that I can get beforehand is appreciated.

Welcome aboard fellow Burb owner. That is my guess too, and I plan do do mine as well this year.


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