Rear end makes popong and grinding sound - Pontiac GTO Forum
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post #1 of 9 (permalink) Old 01-09-2016, 05:36 PM Thread Starter
 
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Rear end makes popong and grinding sound

My rear end started making a poping and grinding sound a few months ago while turning slow to the left or right so i changed the fluid with royal purple 75-140 and it said it had the additive mixed in so i used that and the sounds went away for prabably 2 month's then came back so i went to GM and got there additive and put in around 2oz and the sound is still there should i just keep puting the additive in or what
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post #2 of 9 (permalink) Old 01-14-2016, 11:09 AM
 
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I expect your differential is beginning to fail. You should look into rebuilding the limited slip or replacing it with something like the TrueTrak.

Maybe talk to rearend shop.
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post #3 of 9 (permalink) Old 01-16-2016, 12:20 PM Thread Starter
 
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I expect your differential is beginning to fail. You should look into rebuilding the limited slip or replacing it with something like the TrueTrak.

Maybe talk to rearend shop.
Thanks for the response and I just talked to a shop and they said try torco 85w 140 with there type f modifier first. What would be the advantage with the truetrak over the stock lsd I do plan on heads, cam ect in the future.
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post #4 of 9 (permalink) Old 01-17-2016, 12:56 PM
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Thanks for the response and I just talked to a shop and they said try torco 85w 140 with there type f modifier first. What would be the advantage with the truetrak over the stock lsd I do plan on heads, cam ect in the future.
They are right. Try the Torco first. With a TrueTrac you don't need friction modifier as they don't depend on slipping cones but just use regular gear oil. From people's experiences I've read though I'd get a WaveTrac. The TrueTrac seems to have had spotty reliability.

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post #5 of 9 (permalink) Old 01-19-2016, 11:37 AM Thread Starter
 
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Thanks for the response and I just talked to a shop and they said try torco 85w 140 with there type f modifier first. What would be the advantage with the truetrak over the stock lsd I do plan on heads, cam ect in the future.
They are right. Try the Torco first. With a TrueTrac you don't need friction modifier as they don't depend on slipping cones but just use regular gear oil. From people's experiences I've read though I'd get a WaveTrac. The TrueTrac seems to have had spotty reliability.
Thanks but $1,200 might be alittle much for me Lol and the torco should be in Friday if that fixes it im going to try to do something about the wheel hop thinking about drag bags to start out with.
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post #6 of 9 (permalink) Old 01-19-2016, 12:23 PM
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Nothing is cheap about these cars. If it doesn't take care of it and you want to save some money look for a used diff. A TrueTrac is cheaper than a WaveTrac but with installation both are quite a bit of money.

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post #7 of 9 (permalink) Old 01-19-2016, 03:39 PM Thread Starter
 
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That's what i was thinking just get a used 1 if its still acting up
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post #8 of 9 (permalink) Old 01-30-2016, 11:08 PM
 
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Short n sweet rear dif fluid DIY:
https://youtu.be/ZVw-IgDOtZs
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post #9 of 9 (permalink) Old 02-23-2016, 11:23 AM Thread Starter
 
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Short n sweet rear dif fluid DIY:
https://youtu.be/ZVw-IgDOtZs
Cool video and I put the torco in about 3 weeks ago and so far on made the grinding sound 1 time and it was a day or 2 after the oil change and had no weird sounds since
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