T-56 viscosity adder?

[Robert Lone]

What stringy stuff can you put in a T-56 trans that won't hurt it?

Something like STP or Lucas...

...I hear noises...:rotf:

 

[midnightbluS10]

I used Moreys in the 4-speed portion of my 85. (Not the overdrive). It had synchros that were a little too loose and grindy to pass Performance Verification. I used 50/50 gear oil and Moreys. It worked pretty well.

I'm not positive, but doesn't the T56 use ATF? IIRC, some transmissions use paper cone clutches, rather that the old-school brass synchros (like the T-10 in my 85). I believe the T56 may be one of these. If this is the case, maybe try the red-bottle Lubeguard that's for use in automatics. I'd only put about a 1/4 bottle in it.

If you hear noises, no additive is likely to help. I don't think there's a way to thicken the lube, and not harm the paper clutches, if this is indeed the case. You need to determine the type of lube it uses. If it's ATF, you don't have many options. If any.

Tremec recommends Dexron III for the T56.

 

[Robert Lone]

Re: T-56 viscosity adder?

It does use Dex III, and what I was told is true, the sycronizers are carbon.

4th gear at low rpm (below 1400) makes a racket when I roll into the trottle.

It sounds just like a bad throw-out bearing.

I just want some more viscosity to see if it helps but don't want to f'up the syncronizers....

 

[Robert Lone]

Re: T-56 viscosity adder?

I wonder if this is just gear rattle, like the 6-speed ZF makes? In Corvette, they use the dual-mass flywheel (it has rubber dampers between the engine and clutch mounting points on the flywheel) to mitigate it. It's caused by the torque-pulses of the engine power strokes overcoming the springs in the clutch disc, and the two elements of the disc bang back-and-forth. I could see where this might occur in 4th, at low RPW, with a high-torque engine. (Yours qualifies).

There might not be anything wrong. Perhaps a clutch disc with stronger springs could help.

Good point...

...however, it didn't do this before it sat up for 4 1/2 yrs...

...unless the new build makes that much on the bottom end causing said problem...:roll:

EDIT: 1 ton pressure plate is in the truck...my left leg is feeling it...limp

 

[Robert Lone]

Re: T-56 viscosity adder?

NOT the pressure plate. The clutch DISC. Those damper springs in the middle of it.

My clutch disc is solid from Kentucky Clutch.

No springs...

 

[sy#2716]

Re: T-56 viscosity adder?

in my 95 z28, my brothers 94 ta , and also his 00 ta with the t-56 did the same thing at low rpms

 

[Robert Lone]

Re: T-56 viscosity adder?

in my 95 z28, my brothers 94 ta , and also his 00 ta with the t-56 did the same thing at low rpms

Now that you mention that, I never asked to old motor to grunt like this off the bottom. I always kept the rev's up more than I am now.

Trans was prolly like this the whole time just never got the chance to make this noise because of how I used to drive it.

Good to know:tup:

 

[TYHOGG]

Re: T-56 viscosity adder?

A lot of the race car guys use light weight motor oil.