[99blackz]

Seem to be having a little transmission/converter trouble. When i'm cruisin at 60-70mph my truck seems to shudder some, almost like your going across rail road tracks. It does it when the truck starts to lug just before it down shifts. If I give it more gas or slow down the shudder stops.

The guy I use locally for repair (he did not service the transmission last) suggests that they did not put in the correct fluid. He wants me to add some friction modifier (lube guard) to see if that clears it up, and then we could just flush the trans and add the correct fluid.

All the guy that serviced it last can tell me is they used synthetic fluid.

What do you guys think?

 

[SDP-1]

could be the converter.

 

[Durallymax]

Well for one you can't flush the Allison like a normal transmission.

2 shuddering from the tc is possible and happens with power upgrades.

3 I don't know how your service guy would be able to tell which fluid is which

 

[99blackz]

2 shuddering from the tc is possible and happens with power upgrades.


So is that something that can be corrected or do you just live with it?