ok, when i'm cruising at a constant speed say about 70-75mph on the highway and i go to punch it, my rig will hesitate a bit and then go. if feels like the tranny is slipping or something, but there is no build up then BOOM! into gear. when i'm on a county road and going about 55-60mph and punch it, this doesn't happen at all. i do have it tunned and i've had it with the mds on and off and it still does it. any ideas? thanks in advance.

 

Its a "dead spot" in the transmission there are quite a few of them through out the powerband. Nothing is wrong with your truck though. I have one around the 30mph mark, between the 45 and 50mph mark and another around the 75-80mph mark.

 

thanks man, i'm a worry wart when it comes to the ride.

 

My truck was similar. Then i turned MDS and much better. Then i changed the part throttle upshifts with my Predator and sooo much better. While that doesn't help the downshifting, it will help you stay in gear while going up a hill or just going through the city. i have my partial shift points set so high that my truck will "hang" in 2nd gear cruising 25-30mph instead of shift into 3rd and then my exhaust is silent and then the hesitation of downshift when you romp on it. The partials will allow you to alter those settings.
For shifting at WOT I set shift points to 6k and OMG talk about a kick in the *** when it shifts! BOOM. I love it.

 

You can adjust the shift points with the diablo to narrow that gap where the dead spots occure, but from what have personally experienced, you cannot completely get rid of them. Most of them occure from a light throttle position to going to WOT.

It could also be the damn fly-by-wire throttle we have too. that would also cause that little problem you are describing. Basically it takes a few seconds for the computer to tell the throttle to go. You can try to recalibrate it to see if that helps some. Go out and turn your truck to the ON position (do not start the truck) and push the gas peddle all the way to the floor and wait 5 sec or o with it pushed to the floor, turn the key off and slowly release it. There is another method as well but I cant think of it off the top of my head and I thats the way I always do it and it works out fine.

 

can you explain more about changing the shift points? i've changed mine, but i'm not entirely sure i'm doing it right. if i can remember correctly, on my predator it has 1-2, 3-4 or maybe it's 1-2,2-3. anyway, i've made my shift points higher, but not that high. should i make them higher? there are no percentages, just rpm numbers.

 

You should be able to do the partial shift points. those are what really narrow those shifts down. A lot of it is trail and error til it feels right.

 

ok, thanks again. i'll have to toy with it a bit and see what's up.

 

Take a look at the diablo thread in the stickies on the top of the page and read from post 201-240 that should help clear some things up I hope if not just ask someone on here will know or will help you find out you need to do

 

Is it common to have a dead spot at <10mph? Just seems when I'm at a standstill and start to move it takes quite a bit of throttle before i feel the kick.

Feels like a bad lag, as if I am pulling a trailer. Only no trailer is hooked up.

Sorry for the hi-jack