PerformanceTrucks.net Forums - 4.8 rpm shift points..

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Slowest_1500

Jul 17, 2013 11:03 PM

4.8 rpm shift points..

I was messing around a little with the rpm shift points on my predator, I left the 1-2 points stock at 5700 RPM
the 2-3 points I put to 5500 RPM

anybody got some advice? trying to accelerate a little faster? or maybe extend 2-3 to 90 mph?

BIGDADDY1969

Jul 18, 2013 12:24 AM

Get Custom tuning thru that predator and you'll see more gains at those shift points .. The DiabloTunes are generic moderate tunes to accomodate all 4.8s ... Custom tunes are specific to your trucks data logs .. I personally have DiabLewtuned Custom Tuning .. But there are others i just dont know them .. :sigh:

lycominghunter

Jul 18, 2013 08:36 PM

for reference, I have my WOT shift points at 6400 rpm and I have 170,000 miles on my 4.8. I think ill go up to 6600 too next time at the track. its pretty sweet shifting into 3rd around 100 mph :)

Slowest_1500

Jul 18, 2013 10:18 PM

Quote:

Originally Posted by lycominghunter (Post 5126386)

for reference, I have my WOT shift points at 6400 rpm and I have 170,000 miles on my 4.8. I think ill go up to 6600 too next time at the track. its pretty sweet shifting into 3rd around 100 mph :)

Holy crap! 0.0

RS/SS 4.8

Jul 18, 2013 10:44 PM

Quote:

Originally Posted by lycominghunter (Post 5126386)

for reference, I have my WOT shift points at 6400 rpm and I have 170,000 miles on my 4.8. I think ill go up to 6600 too next time at the track. its pretty sweet shifting into 3rd around 100 mph :)

I remember when mine was doing 112 into third. Now it does it at 84, big difference. Dont know what im shiftin at but im pretty sure its way past 6k.

Slowest_1500

Jul 19, 2013 07:43 AM

Quote:

Originally Posted by RS/SS 4.8 (Post 5126434)

I remember when mine was doing 112 into third. Now it does it at 84, big difference. Dont know what im shiftin at but im pretty sure its way past 6k.

I got it shifting in to 84 now also, it feels good it was doing it at around 79 before so im happier, BUT I WANT 90+! :(

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