Manual Transmission T56 | T5 | MN12 | Clutches | Hydraulics | Shifters

What fluid are you running in your T-56 ?

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Old 03-08-2011, 11:06 PM
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Default What fluid are you running in your T-56 ?

I put some Dex IV Valvoline ATF in my old worn T-56 last year and it shifted so crappy I drained it after a few miles and switched to Pennsoil syncromesh which had such great reviews on here a year ago. I really liked the sycromesh allot better than the regular ATF Dex IV (since you can't get Dex III anymore)

Now I just got a stage 2 built T-56 from Jason in Texas and he as well as everyone on here is now recommending regular ATF again.

I may try to get some amzoil ATF but I am sure I will have to order it online since we don't have any stocking dealers.

Anyway what fluid have you had the best luck with? There are NO wrong answerers here just curious what works for YOU.

Last edited by adrynalinjunkie; 03-09-2011 at 07:31 AM.
Old 03-08-2011, 11:28 PM
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I used Mobil 1 atf last time I changed it out, and it worked great for me. I think I might of read a while back that people were having issues running Royal Purple.
Old 03-08-2011, 11:34 PM
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Still running Torco ATF in mine.
Old 03-09-2011, 02:05 AM
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i had royal purple syncromesh in mine when i first broke it in and then i switched to valvoline dex 4 too and i must say it shifts like **** now soo im looking for something else to switch to also
Old 03-09-2011, 02:44 AM
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Mobil 1 ATF, for stock or rebuild, aftermarket, wat ever, just using mobil 1, and if some one say running mobil 1 atf will destroy their paper type blocker ring thing on their stock tranny, tell them fk off.
Old 03-09-2011, 02:45 AM
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This question is asked almost daily.

Pennzoil Synchromesh. The same Synchromesh GM uses. Made the trans noticeably smoother. Stock trans though.

Originally Posted by Egg1456
i had royal purple syncromesh in mine when i first broke it in and then i switched to valvoline dex 4 too and i must say it shifts like **** now soo im looking for something else to switch to also
Probably because of the RP you used... :/
Old 03-09-2011, 03:44 AM
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I've been using Amsoil since I rebuilt the transmission with carbon kevlar blocker rings. No complaints.
Old 03-09-2011, 04:10 PM
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Are you Amsoil guys using the ATF or the 5w-30 manual tranny syncromesh?
Old 03-09-2011, 04:26 PM
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I run 2 quarts of Mobil 1 ATF and 2 quarts of Synergyn Syngear II Manual Transmission fluid.
Old 03-09-2011, 04:37 PM
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I have the t56 mag and it says on the side to use that "Dex" whatever - i have not filled it because it's not installed but most likely run Amsoil or Mobile - not even close to a stock application.
Old 03-09-2011, 07:53 PM
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Any Dexron III equivalent will work fine. I've also used Pennzoil Syncromesh, it worked fine, but there was no difference between that and the Advance Auto DexIII I have in it now.

Smooth shifting is all about having a Tick master cylinder and keeping the clutch fluid refreshed often. It takes very little brake fluid to refill, and it's cheap, so do it. I don't bleed it very often, I just regularly change the fluid in the reservoir and that keeps it clean and shifting good.
Old 03-10-2011, 01:42 AM
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I've been using just the regular castrol or valvoline DEX III ATF. I tried the Mobil 1 synthetic ATF and thought it felt rough. Maybe it was just me though, a lot of guys have had good luck with the M1 synthetic ATF...
Old 03-11-2011, 01:35 PM
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cheap ATF, whatevers on sale, change it every year. SYCmess was to thick and notchy, sucked in the fall when it gets cold out.
Old 03-11-2011, 02:23 PM
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Dexron III from Advance auto is what I use. I like it better than Pennzoil syncromesh
Old 03-11-2011, 04:28 PM
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Dexron III is what we always suggest!
Old 03-11-2011, 04:32 PM
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Valvoline dino oil
Old 03-11-2011, 06:18 PM
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GM never made Dexron IV (4), neither did valvoline. They skipped IV and went to V and now VI.

I use what GM recommends.
Old 03-11-2011, 09:56 PM
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People always complain or say they've heard complaints about royal purple and I just don't get it. I use there atf, rear end, and engine oil. I don't have a single complaint about anything and it's all i've ever used in any car i've ever owned...
Old 03-12-2011, 01:36 PM
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i run royal purple ATF
Old 03-12-2011, 01:45 PM
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why do you have to run atf in gm and ford manual trannys ? Honda transmissions use 10/30 motor oil and ive ran atf also ,, gm synchromesh ruined my honda trans ,,now i run 5/20 in my honda trans and it shifts like a dogbox !! im just curious to why you have to use atf ? i mean atf isnt a very good lubricator,, i even use a mix of non-detergent 30wt in my automatics with atf,, just dont understand the whole atf and hard parts .. anyone?


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