Automatic trans tuning with predator

[Blackone51]

Anyone know what should I be changing in a predator tune for an automatic trans with 4.10s. Shift points, line pressure etc... I trying to work out the bugs, think I have an exhaust leak and headlights low beams don't work (including stock gauge lights and running lights as of last week, not sure whats going on there) before I take it to get tuned by DynotuneMP (home of Mike Post). Decided to go with them over Anderson motor sports because they are 2 hours closer (shorter distance to tow if stock block gives out lol).

 

[smythge]

You're going to have to play with the shift points. I have 4.10s and a Vortech blower I have my 1-2 shift set a 4,750 (shifts at 5,900) 2-3 shift at 5,700 3-4 set at 5,300. I have PA valve body so I left the firmness and torque modulation set to stock. You need to play around with the line pressure and adjust it to the way you want it to feel.

With a stock valvebody and 3.27 gears the 1-2 shift takes about 1 sec to happen with 3.27 gears your motor is reving about 1,000 RPMS per second, if you want it to shift at 6,000 set the shift point to 5,000. With 4.10 gears the motor revs up faster if you leave the shift point at 5,000 it might not shift until 6,200 in that case you will hit the rev-limiter between the 1-2 shift, so you need to experiment and find the "sweet spot" if you do some reasearch there are ways to modify the valve body to make the 1-2 shift happen faster.

I am not sure if you have a seperate transmission cooler, if not I would consider adding that as well, heat kills transmission.

 

[Blackone51]

You're going to have to play with the shift points. I have 4.10s and a Vortech blower I have my 1-2 shift set a 4,750 (shifts at 5,900) 2-3 shift at 5,700 3-4 set at 5,300. I have PA valve body so I left the firmness and torque modulation set to stock. You need to play around with the line pressure and adjust it to the way you want it to feel.

With a stock valvebody and 3.27 gears the 1-2 shift takes about 1 sec to happen with 3.27 gears your motor is reving about 1,000 RPMS per second, if you want it to shift at 6,000 set the shift point to 5,000. With 4.10 gears the motor revs up faster if you leave the shift point at 5,000 it might not shift until 6,200 in that case you will hit the rev-limiter between the 1-2 shift, so you need to experiment and find the "sweet spot" if you do some reasearch there are ways to modify the valve body to make the 1-2 shift happen faster.

I am not sure if you have a seperate transmission cooler, if not I would consider adding that as well, heat kills transmission.

Thanks for the great advice I try some stuff tonight.

 

[BurningRubber]

Be careful adjusting the shift firmness with the Predator. It raises line pressure and that accelerates wear on the transmission.

The safest way to get firmer shifts out of these transmissions is to do the "j-mod". Do a search on it and you will find a good bit of info.