G56 TRANSMISSION - WHICH FLUID TO RUN?

Swapped out the ATF for a thicker fluid to reduce the sound of gear rollover.

[@davidanderson8469]

I've used Amsoil 75-90 MTG for 70K now. It's the slickest I've found. Simply elevate the passenger side tire and the 7th qt goes in. No need to pull the shifter.

[@TeezleySPT]

Check out the “TDS g56 side cover” on Ebay. It has a fill plug that lets you to add 8 quarts so no need to pull the shifter

[@TheWeeklyStruggle]

Wait really?! I need this! I hate putting my shifter off. I have the cv boot mod as you probably saw in the video but once I get the factory seal I hope to never pull the shifter off again if I have that plate you’re talking about.

[@AquaticLogic]

Buddy im no expert, but putting GL-5 oil in there I think is super bad on the brass synchros. GL-5 is designed for higher pressure situations and can be corrosive on softer metals. You need to use GL-4! Thats what my Amsoil guy said at least.

[@bobmcalister2131]

After 2 years how is the G56 doing with the heavy oil ?

[@dtrust68]

has it acted up during the winter? as in heavier weight = harder shift? where i live it gets to around 0 in the winter and a heavier weight might suck for me. also Amsoil calls for ATF.

[@TheWeeklyStruggle]

Oh yeah most definitely! It was pretty cold out around the time I made this video. No matter if you use this thick stuff I put in, or the mobile delvac 50w, they do not like to shift right away. If I time it right with the rpms I can get it to shift before it’s warmed up, it just doesn’t like down shifting when it’s cold. But once it’s warmed up a bit it shifts great. Stuffs probably thicker than honey when it’s 10 degrees out lol

[@kyles234]

I have the Amsoil 75w90 syncro oil and it shifts fine at -44C. I live in northern BC Chinandia.

[@varmint223]

I did the TDS plate and filled with Valvoline synchromesh and it was nice shifted good but after a month it’s back to sounding the same as old atf and shifts hard when cold think I’ll go back to atf4

[@corneliodyck2276]

I put that oil in my transmission and after 2 months it was a mess do not use this oil

[@kyles234]

I have the Amsoil 75w90 syncromesh oil in my g56 416hp and 950ftlbs. Tows a tow hauler with 28000 GCVW. It's been in there for the last 103000kms. No issues.