Allison Transynd, 46k miles, 04 Chevy 2500HD

[TXHunter]

This fill is still in service. This is the Castrol (Allison branded) transmission fluid made to Allison specs.

 

[LargeCarManX2]

Glad to see you are watching your transmission with UOA....wish more could/would! Great report!

 

[MolaKule]

I believe the Transynd starts out with a viscosity of about 7.5 cSt, so it is shearing a bit.

 

[wirelessF]

Taking a look at the vis it would've been DexVI.

 

[TXHunter]

Yeah I think it has a 7.4 or 7.5 cSt, so I was puzzled by the numbers of the first and second sample a bit. The previous fill was Valvoline Maxlife ATF, and we did a flush with 16 quarts of the Allison Transynd (Allison 1000 holds 12.7). The allison fluid is supposed to contain no VI, so shearing especially in that short of miles doesn't seem right to me.

I personally watched them pour in the Allison fluid I brought, so I'm confident it wasn't switched out to DexVI.

 

[MolaKule]

You kinda led us to believe this was always samples of Transynd sampled at 22k and 46k.

So, the first column on the right is VMAX sampled at 22,681 miles??

Or, did you change out the MaxLife before the sampling took place?

 

[TXHunter]

No, everything on the blackstone report is the Allison Transynd. Before I switched over to that fluid, and before I ever did a UOA, I had VMAX in the transmission. Both of the UOA's on the report are from the first fill of Allison Transynd.

 

[MolaKule]

OK, thanks.

Then the only thing I see that may need watching is the viscosity reduction due to shear.

The viscosity differences reported I think is mainly due to instrumention.

 

[dnewton3]

worthy of continued use.