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Royal Purple Transfer Case fluid


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#1 5Jake5

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Posted 28 December 2008 - 07:28 PM

I am changing the fluids in my diffs, 5sp tranny and transfer case. Using all Royal Purple products. I have the 75W-90 Max Gear for the diffs and synchromesh for the tranny, but have heard people on this site using synchromesh AND ATF (Royal Purple) in their transfer cases.

Which one is best and why?

Thanks for the help.
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#2 Saturnstyl

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Posted 28 December 2008 - 07:59 PM

QUOTE (5Jake5 @ Dec 28 2008, 07:28 PM) <{POST_SNAPBACK}>
I am changing the fluids in my diffs, 5sp tranny and transfer case. Using all Royal Purple products. I have the 75W-90 Max Gear for the diffs and synchromesh for the tranny, but have heard people on this site using synchromesh AND ATF (Royal Purple) in their transfer cases.

Which one is best and why?

Thanks for the help.



Autotrac requires autotrac fluid. Otherwise, it takes ATF.
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#3 03zr2

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Posted 28 December 2008 - 08:01 PM

I have used Royal Purple Max ATF in my t case for over 127,000 miles with no problems. My truck had 20,000 miles when i got it. Now it has 147,000+ miles and i have used Royal Purple 5w30 in motor, Max Gear 75w90 in diffs, Max ATF in t case and Purple Ice in rad since i got it.

Edited by 03zr2, 28 December 2008 - 08:11 PM.

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#4 Miles

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Posted 29 December 2008 - 12:09 AM

QUOTE (03zr2 @ Dec 28 2008, 07:01 PM) <{POST_SNAPBACK}>
I have used Royal Purple Max ATF in my t case for over 127,000 miles with no problems. My truck had 20,000 miles when i got it. Now it has 147,000+ miles and i have used Royal Purple 5w30 in motor, Max Gear 75w90 in diffs, Max ATF in t case and Purple Ice in rad since i got it.


....and you can use RP ATF because you have a 233 x-case. However....those with the Autotrac 236 MUST use Synchromesh. It's a different animal. Fit for a boat anchor.
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#5 5Jake5

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Posted 30 December 2008 - 10:24 AM

Thanks for the info. I don't have teh autotrac. I have the 233 t-case. Anybody else want to add their $0.02? If not, it looks like I will be going to Napa to get Royal Purple ATF.

Thanks,
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#6 Adamr916

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Posted 30 December 2008 - 01:19 PM

so quick question, is syncromesh the same color as the atf fluid? i know thats a stupid question, but my 236 looks like it has the red atf in it
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#7 HenryJ

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Posted 30 December 2008 - 08:29 PM

NVG 236/246 Autotrac uses Auto-trac fluid which is blue
NVG 233 selectable two speed uses Dextron III ATF which is red

Synchromesh fluid is brownish clear and is used in the manual transmissions. Don't confuse it with Auto-trac fluid.

Edited by HenryJ, 30 December 2008 - 08:30 PM.

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#8 raven2510

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Posted 02 January 2009 - 09:57 AM

if you dont have auto-trac. then get the sycncromesh.
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#9 Adamr916

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Posted 04 January 2009 - 10:44 PM

so lets just say that the fluid in my 236 is red, how bad will it mess up the transfer case? i would've noticed it if i had changed the fluid in it myself, but it came this way from the previous owner, is the t-case messed up then, because i have been having problems with my transfer case lately
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#10 raven2510

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Posted 06 January 2009 - 12:59 PM

if its red that means it had the correct fluid in it. the Royal Purple syncromesh will mix fine with the old fluid. you should have no problems
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#11 killian96ss

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Posted 06 January 2009 - 09:45 PM

If you have a 236/246 autotrac you need to use the blue GM autotrac fluid (do not use the red Dexron or any other fluid in an autotrac transfer case).

If you have a 231/233 you can use regular red Dexron III or if you want to use Royal Purple use their Syncromax manual transmission fluid which is designed for manual transmission and transfer cases.

Steve
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#12 killian96ss

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Posted 06 January 2009 - 09:49 PM

QUOTE (raven2510 @ Jan 6 2009, 09:59 AM) <{POST_SNAPBACK}>
if its red that means it had the correct fluid in it. the Royal Purple syncromesh will mix fine with the old fluid. you should have no problems

If he has an autotrac transfer case then the red fluid is NOT the correct fluid and it should be changed to the blue GM autotrac fluid.

You will damage an autotrac transfer case using regular red Dexron III.

Steve
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#13 raven2510

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Posted 07 January 2009 - 10:50 AM

he already said its a 3 button 4x4....not the 4 button piece of crap 4x4
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#14 killian96ss

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Posted 07 January 2009 - 01:16 PM

QUOTE (raven2510 @ Jan 7 2009, 07:50 AM) <{POST_SNAPBACK}>
he already said its a 3 button 4x4....not the 4 button piece of crap 4x4

Your reply came right after Adamr916's post in which he said he has a 236 (autotrac) with red fluid in it which would be the wrong fluid.

I thought your reply was to him. unsure.gif Sorry for the mistake!

Steve
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#15 Seapahn

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Posted 07 January 2009 - 05:34 PM

Why bother changing t-case fluid to something other than stock? Is there something wrong with the stock one? Are t-cases failing due to shortcomings in the stock fluid? Do t-cases with the royal purple stuff perform better somehow?

I understand transmission and diffs as there is a noticeable difference and you might want to run synthetic in the diffs for towing etc (which is what I do). But I don't think there's much of a reason to mess with the t-case. However, I have autotrac so I've just been using the GM blue stuff ... just wondering.
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#16 killian96ss

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Posted 07 January 2009 - 05:51 PM

The t-case will work fine with either fluid (autotrac should use autotrac fluid only) and I don't think the regular fluid is all that bad, however running synthetic will reduce friction which equals more available power and better gas mileage plus better protection for the wearable parts inside the t-case so it should last longer before a rebuild is needed.

Synthetic fluid also has a longer drain interval which means you don't have to change it nearly as often as regular fluid which breaks down faster, so in the end the extra cost of the synthetic fluid is offset by being able to run it much longer. wink.gif

If the price comes out to be the same in the long run, why not be nice and give you vehicle better protection? idea.gif

Running synthetics in the t-case will not benefit you nearly as important as synthetic engine oil, or synthetic differential gear oil, but every little bit helps. smile.gif

I also have the autotrac so I can only use the blue GM stuff frown.gif , but I do run Royal Purple Syncromax in my recently rebuilt 207 in my 88 S10.

Steve

Edited by killian96ss, 07 January 2009 - 05:53 PM.

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