Im new at this..SO TREAT ME LIKE A VIRGIN. I was hammering off from a light and when I got to OD tranny slipped like crazy. when I turn off the OD it shifts fine but in od it makes noise and wont do sh** I sure hope someone can point me in right direction. thanks

 

If you have a Diablo Preditor then restore you factory back tune then reinstall your custom tune. Mine you shift fine with overdrive off but with it on and at full throtle it would act like a manual transmission and you were letting off the gas then flooring it over and over. Doing the above steps fixed it I had a corupt file in my tune some how.
jeff

 

I also had the same problem/fix as georgia-SVT.

These trucks can corrupt the program now and then. Mine was fine for the longest time, and from one day to the next it started acting up.

Do what georgia-SVT recommended if you have a Predator.

 

I appreciate the advise more than you know.thanks a million.igot a ftvb in the truck and a antique blue superchip. Does anybody think replacing original chip will help?

 

Then 1st I'd make sure the chip had not worked it's way out. If you are running a 4# pulley or less pull the chip out and see if it acts normal. Do not do this if you are running a 6#er or higher. CHeck the chip and see if it is fully seated in the ecu sometimes they work loose and cause all kinds of wierd problems.
jeff

 

Does that chip have a switch so you can switch from factory program to chip program? If not you could try taking the chip out to see if it will do the same thing. Is the OD light on the shift handle flashing? If it is get a code reader and see what codes it's throwing. You could also try asking Greg Evans (factorytech) in his forum at NLOC.

 

going to try what you guys are telling me tonight and hope for the best.I dont have the light blinking on od or ses light. this stuff is way past my pea brain.THANKS!!!

 

Everyone has a different deifinition for slipping so let me have yours. When you shift into OD does it feel like it is shifting into Nuetral>??? RPMs coming up but the truck isn't going anywhere>??? If so, it sounds like it might be time for an overhaul. I take it you have checked your fluid level>??? -Mat-

 

checked fluid first,slammed hood;got on here,then got drunker than i have been in ten years.It didnt help the truck.the slipping is along with a little noise it feels like it grabbing or jerking.when I shut off the OD shifts fine .OD on it wont even pull out right. thanks again!

 

Sounds like what mine was doing with overdrive on if you drove normal and did n ot got WOT it was fine but as soon as you went WOT wether you were in 1st,2nd or 3rd it would start to jerk like it was a manual transmission and you were flooring it then letting off and flooring it over and over and it would do it until you let off the gas. I'd check the chip and pull it to see if that is it and drive it. If you are running more than 12psi(more than a 4lb pulley) do not go to WOT.
jeff

 

With OD on all the gears act up or just 4th>???

 

just gotta chance to check the chip I was able to nudge it in a little. I wont have a chance to drive it until tomorrow night.You guys are the best love the site and thanks again!

 

Fingers crossed for you bud.
jeff

 

Well got a chance to take computer out. cleaned the contacts and retaped it. put it in and it still acts up.shifted fine until OD then it bogs like you hit a wall man im lost. What do you guys think? Try original chip? or park it. wish I had a bunch of you around.someone would get it. thanks!

 

Try it without the chip as long as you are not running more than a 4# lower pulley.
jeff