MurderedSS Posted May 30, 2014 Report Share Posted May 30, 2014 What fluids you guys running planned on going with all royal purple but is there and better you guys have found out let me know Quote Link to comment Share on other sites More sharing options...
coal miner Posted May 30, 2014 Report Share Posted May 30, 2014 I run royal purple in everything. I could tell a slight difference when I done the transfer case and rear ends. Royal purple is prob the best off the shelf fluids you can buy at the auto parts stores IMO. Quote Link to comment Share on other sites More sharing options...
MurderedSS Posted May 30, 2014 Author Report Share Posted May 30, 2014 It was between rp and amsoil but yeah I think im gonna still with rp Quote Link to comment Share on other sites More sharing options...
jsanders347 Posted May 30, 2014 Report Share Posted May 30, 2014 I have no experience with royal purple but I run amsoil in my 4 wheeler and I noticed a big difference after running it. Sent from my SCH-I545 using Tapatalk Quote Link to comment Share on other sites More sharing options...
f1ss Posted May 30, 2014 Report Share Posted May 30, 2014 Personally, M1 or Amsoil. Then if I ever changed it would be to Amsoil. Just went through this whole service replacing every single fluid and filter. Tranny and T-case liquid was swapped out for the same stuff I ran when I had fluids changed in 07. Quote Link to comment Share on other sites More sharing options...
MARTYW Posted May 30, 2014 Report Share Posted May 30, 2014 I have Amsoil in my front diff, Mobil 1 in my rear diff, and that funky blue stuff from GM on my transfer case. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
coal miner Posted June 3, 2014 Report Share Posted June 3, 2014 I used rp in my t-case. Haven't had a bit of trouble. Quote Link to comment Share on other sites More sharing options...
Aldofashow Posted June 3, 2014 Report Share Posted June 3, 2014 Auto trac blue in the transfer and amsoil in the new transmission and RP in the front & rear dif at 155000 miles all good and no weird sounds Quote Link to comment Share on other sites More sharing options...
JC03SS Posted June 3, 2014 Report Share Posted June 3, 2014 It was between rp and amsoil but yeah I think im gonna still with rp Amsoil Only. I'll never use anything else. I'll never use RP! Quote Link to comment Share on other sites More sharing options...
abss_2003 Posted June 3, 2014 Report Share Posted June 3, 2014 What are the thoughts on synthetic 75w-140 diff fluid Quote Link to comment Share on other sites More sharing options...
Muggs Posted June 4, 2014 Report Share Posted June 4, 2014 I have M1 in front and rear diff and GM auto trak the blue stuff in the trans case. Quote Link to comment Share on other sites More sharing options...
03AWDSS Posted June 4, 2014 Report Share Posted June 4, 2014 I have Royal Purple in everything but my engine (havent gotten to it yet) Quote Link to comment Share on other sites More sharing options...
Zebra Posted June 15, 2014 Report Share Posted June 15, 2014 What are the thoughts on synthetic 75w-140 diff fluid I considered that but went with Amsoil 75w-110 in the front today, also in the rear when my diff cover arrives. Quote Link to comment Share on other sites More sharing options...
zippy Posted June 16, 2014 Report Share Posted June 16, 2014 I recommend 75w90 in front and rear and both to be synthetic for sure. 75w140 is fine if you run in very high temps otherwise stick to 75w90. Royal Purple, Mobil 1, and Amsoil are all very good choices. Make sure to not use any additive in the rear diff as that can cause the clutches to stick together and not allow the diff to unlock. There is an actual bulletin from GM about that specific issue. For the transfercase simply use a Dexron 3 approved fluid either in synthetic or GM form. That is the recommended fluid from GM and the same I'd recommend myself. In GM form Dexron 3 is only sold as manual transmission and transfercase fluid though since Dexron 6 is now the fluid they sell as actual transmission fluid and yet isn't recommended in manual transmissions and transfercases. Don't bother with the Autotrac fluid from GM (blue stuff) either. You will be wasting money on that as it is designed for cases where the fluid contacts the clutch pack. The Silverado SS uses a viscous coupler which is a sealed unit and the transfercase fluid never gets into the viscous coupler unit. If it did that would mean the seal is broken and the unit is failing anyway. The transfercase fluid in the SSS is only there as a lubricant for the bearings and chain as well as there to keep it all cool. Quote Link to comment Share on other sites More sharing options...
MurderedSS Posted August 2, 2014 Author Report Share Posted August 2, 2014 Thanks alot guys haven't been on in awhile and zippy might be getting ahold of ya to tune my truck this winter and again thanks guys Quote Link to comment Share on other sites More sharing options...
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