GXP Transmission Question?????

**kbstl77** · 01-24-2011

Recently my 06 GXP trans has been acting up. 1st, 2nd, 3rd are great and perform just fine. Problem is somewhere in 4th at around 65-70mph it will jump in rpm's from 1800 up to abt 2300 and back down again. Just today while accelerating to pass on the highway it stayed in 4th and shuttered pretty bad. Fluid is 5000 miles old. Did complete flush (including converter) and replace filter and gasket. Used DEX 6 Valvoline full Synthetic. Any one else had these problem??

**Vegas_Matt** · 01-24-2011

how much fluid did you put in it? and you check the dipstick to see if you lost any?

and welcome to the forum!

**kbstl77** · 01-24-2011

I unfortunaley didnt do it personally. I have a good friend that runs a shop here in STL and I purchased 14 quarts based on what he told me his machine required. I know if you just drain the fluid and not the converter its only 7.4 quarts. I check the fluids weekly because of the mileage I drive and it is perfect everytime in the last 5000 since the change. I'm clueless...

**QwikGT** · 01-24-2011

my old trans did that when the converter was going bad

**sportred04** · 01-24-2011

i never flush mine. just drop the pan and change the fluid and filter. just me cuz im a cheapo

**kbstl77** · 01-24-2011

Sorry I've got transmission on the brain right now. Thanks for the welcome and I appreciate any advice or info.

**sportred04** · 01-24-2011

does sound like the converter is dropping out of lockup and slipping when in lockup. get ahold of trippleedgeperformance.com and that the man you need to talk to.