You are correct in using +4 fluid. The bad news is the trans won't get any better. They are the weakest link on these trucks.
may be a little late for this, but: in some cases if the tranny has not been serviced regularly (every 25000-40000 miles), changing the fluid & filter can do more harm that good.I changed the fluid and filter removing a tone of shavings adhering to the magnet in the pan
Sorry to say, but i have lived by a rule, if ant broke dont fix it. in this case evertime i seen somebody change the fluid the trany craps out.chizzle1 said:may be a little late for this, but: in some cases if the tranny has not been serviced regularly (every 25000-40000 miles), changing the fluid & filter can do more harm that good.
I changed mine once at about 40,000 miles. Used Amsoil and haven't touched it since and it's still fine at 270,000. Fluid looks fine and the truck shifts real nice.MrCrash said:Sorry to say, but i have lived by a rule, if ant broke dont fix it. in this case evertime i seen somebody change the fluid the trany craps out.
What happens is, In some cases your clutches are so worn it's all the crap floating around in there that actually causes the clutches to grab and the trans to shift. Put in all that slippery new fluid and the clutches can't grab and you get the low Rpm slippage you describe.socalrat said:MrCrash, hopefully it is not a total goner but will let everyone know what happens after adding fluid.
Chizzle1, I did a check at operating temp with the truck running in neutral and with it in park and the emergency brake on. Same reading.
Thanks again