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If this is what I’m going with in my 96 with the OEM performance axle, do I need to add more friction modifier or what’s in the bottle is enough?
I swapped the very dirty original fluid a few weeks back to Royal Purple, and since then, I get a clunk once in a while. I’m switching back to the OEM AC Delco stuff I have, just curious if I should add more friction modifier even though the bottle says it’s already added.
thanks
If this is what I’m going with in my 96 with the OEM performance axle, do I need to add more friction modifier or what’s in the bottle is enough?
I swapped the very dirty original fluid a few weeks back to Royal Purple, and since then, I get a clunk once in a while. I’m switching back to the OEM AC Delco stuff I have, just curious if I should add more friction modifier even though the bottle says it’s already added.
thanks
On my '96 since the car sits in the garage for months during the winter, I always seemed to have to change out the rear differential fluid. I would get the chattering noise from the clutches.
On my last change three years ago I used Amsoil severe duty fluid and two of the small GM bottles of Posi additive. It has been quiet for three years!
I found that without adding the small bottles of additive to the main differential oil (no matter if it is GM, Mobil 1, Royal purple I tried them all) the clutches will be noisey.
I don't know that the product you included in the 'snapshot' is correct for your C4. Lubricants are often disputed or suggestion by OEMS changes because of more recent features/additives etc. Might very well be acceptable. Is there a label on the back-side?
Original product GM# 1052271 (long gone) with the use of appropriate additive was considered the desired. These days I'm not sure but I believe the more recent product replacing the 1052271 was/is 89021671 - that's GL4 product and were I you depending on what you used for Royal Purple I'd suggest just adding additive.
What did you use for Royal Purple product? You mention 'clunk' - there's generally a limited slip condition considered 'chatter' - I'd suggest 'first' the additive and spend some time in the parking lot as suggested.
Take the original 1052271 to a dealer and ask for what they currently use. A long time ago a friend ended up with a preferred (he said) 89000401 that's a synthetic.
I'd do additive first for sure. I think the GM stuff originally desired was/is 1052358 - that may not be available. I have a friend who buys nothing but Mopar products. I believe Mopar product might be 4318060AD - He just TEXTED that to me. Take the 1052358 to a GM dealer and ask for it or a current replacing product OR visit maybe 'THE DODGE BOYS'!!!
I used a current Royal Purple 'on-line' lubricant guide and they actually don't display a product for C4 rear differentials!!! What you bought I'd think would be considered appropriate. Who knows!! Your product looks to be their GL-4 equivalent!!
***Maybe before doing a thing you get a 2d opinion. Maybe it actually isn't a 'clutch issue'! How many miles? A parking lot drive NOW might actually confirm for you if it's a 'clutch' issue OR maybe 'fix it'!!! Wouldn't that be wonderful???
Thanks. I'm finally done with work for the evening, I'll search for the additive tonight and see what the interweb has to offer before I talk to the clueless dealer parts counter guy
Thanks. I'm finally done with work for the evening, I'll search for the additive tonight and see what the interweb has to offer before I talk to the clueless dealer parts counter guy
Just remember 1 thing I believe is important!! Additive WILL NOT fix a 'CLUNK'!!! Get the 2d opinion regarding the issue with the rear if there's anything more than a 'clutch' issue. You never did mention miles. Does it matter? Likely not!
Just remember 1 thing I believe is important!! Additive WILL NOT fix a 'CLUNK'!!! Get the 2d opinion regarding the issue with the rear if there's anything more than a 'clutch' issue. You never did mention miles. Does it matter? Likely not!
It's a chatter, I didn't use the correct term. The car is a 96 with 46,600 miles. I was very careful with listening for noises when I first bought the car. This diff chatter off and on, only started immediately after my fluid swap.
did a burnout on a slick road where 1 half was tar patch (slick), the orher was tar and chip (high traction).
the clutches stuck, causing the rear end to clatter and vibrate around corners.
also a loud ‘clunk’ (out of the rear) could be heard at extreme steering angles (backing out of a parking space).
i thought i needed a new d44 rear.
took car to a trusted trans shop. The old man drained the fluid (i had installed a drain plug long ago), and refilled it, using 2x the amount of posi additive.
he did a bunch of circles around the shop but it didnt fix it.he told me to drive cul de sacs round and round. Slow, them go the other direction
after about 20 min of doing this, the vibrating clatter stopped and i heard a squeak like a squegee.
in another 5 min (of circles) the squeak wAs gone and no problems since
Last edited by dizwiz24; Jun 10, 2020 at 09:20 PM.
After an exhaustive search, here's what I'm coming up with:
AC Delco gear oil 88863089
AC Delco additive 88900330
Both Zip and Amazon have these in stock.
After an exhaustive search, here's what I'm coming up with:
AC Delco gear oil 88863089
AC Delco additive 88900330
Both Zip and Amazon have these in stock.
Just buy additive 'local' and add to the RoyalPurple. GM or Mopar I'd think makes no difference. If there's an ACD Jobber local they would likely accommodate you also with those numbers. I always buy local.
Just buy additive 'local' and add to the RoyalPurple. GM or Mopar I'd think makes no difference. If there's an ACD Jobber local they would likely accommodate you also with those numbers. I always buy local.
Funny you mention to keep the Royal Purple and just add the additive. Exactly what I decided yesterday. I did try a couple local places, no luck. Made ******* Bazos richer by 11.95. Will be here tomorrow.
To answer the original question, the GM 88862624 shown in the photo is good to go all by itself. It already has the friction modifier in it.
So did the RoyalPurple that the OP used the first time!!! He's an issue that most might consider somewhat common regardless of product!!! Why dump new stuff for more 'NEW STUFF' that might maybe do the same? It's hard to believe that there was no 'additive' local but ...........
OP - What product did you buy?
The stuff in your original post was for your Z06 correct/ I ordered some parts today and my parts guy mentioned it used there frequently and some '07+ manual trans and manual transfer cases, never for earlier differentials. he mentioned most use the 88863089 you posted for cars and lighter SUV, different product for trucks. He laughed and said 5 guys doing the same/similar service might all ask for different product!!!
To answer the original question, the GM 88862624 shown in the photo is good to go all by itself. It already has the friction modifier in it.
That was exactly my thought too, but for some reason, these older cars need extra additive to stay happy and quiet. I've had that AC Delco fluid I posted in both of my Camaros (one was my road course car), my 16 z51 and just swapped my Z06 diff fluid after the car hit 2k miles (I like doing it once on a new car, after all the brand new gears have meshed together for a couple thousand miles). The additive premixed in the bottle was good enough for all those cars, but the c4 is special I guess
Just to update you guys, pulled out about 1/2 qt of fluid tonight, pumped in the additive and some fresh Royal Purple to top it off. Went to the church parking lot across the street and did some dizzying figure 8s. All chatter is now gone.
Thank you all for your help
If this is what I’m going with in my 96 with the OEM performance axle, do I need to add more friction modifier or what’s in the bottle is enough?
I swapped the very dirty original fluid a few weeks back to Royal Purple, and since then, I get a clunk once in a while. I’m switching back to the OEM AC Delco stuff I have, just curious if I should add more friction modifier even though the bottle says it’s already added.
thanks
I have the same year and differential as you, and it's an auto trans. I was nervous pumping out the old fluid and adding the new fluid due to stories like yours. I used Mobil 1 gear oil (below) with no other additives. Everything ran smoothly to this day.
I used two bottles, wasting some, to overflow past the diff fill hole and create a flushing effect. Let it drain and settle to the correct level and installed plug.
Dif Fluid in 96
