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Part number 124715 is the new blue label hp and they discontinued the older gray label one, it was part number 122210. Amazon or ebay or somewhere like that might try and get rid of some real old stock….i guess the newer stuff was formulated towards fixing issues with gm transmissions a while...

Agree, 2021 zr2 here. Drivability is way better in the tamed down sport mode, the sport mode can tend to be aggressive for winter or loose road conditions but awesomely fun on dry pavement! On sale black fridays only from what I have researched…there is a Canadian supplier and U.S...

Cleaned it on a 2008 tacoma v6 and man it idles and starts so much better….as for anything else…I have not noticed.

People have used amsoil severe gear 75w90 with good results adding amsoil limited slip additives….it is synthetic and a little pricy but it is probably good for the life of the vehicle when you change it…original fluid is usually aweful after 30,000 miles in the most used diff which is usually...

I am going to assume 95% you have limited slip and need a LS GEAR LUBE OF 75w90…for the diffs is most probable. The transmission is totally different of course and depending if you had the shutter issue transmission or even not you may need a total flush with the special Mobil 1 gm specified fluid.

Would it be ok to put the higher quality MOBIL 1 SYNTHETIC LV ATF HP in the transfer case as well? I have a 2021 colorado and it has the awd feature…was going to order the good recommended stuff for my transmission and wondered if its ok to just throw the same stuff in the transfer case?

That makes my day knowing I don’t have to deal with all that time and cost again! Never dealt with changing a differential oil before…be easier if there was a drain plug lol. Thanks for the help!

I changed the oil in my rear differential already, unfortunately I did some research after the oil change and taking advice from the guy at the autoparts store. I put in Amsoil 75w90 long life synthetic gear lube, he basically said it is gl-5 approved and doesn’t contain the limited slip...