2005 4.7 quad cab auto. A new Jeep grand Cherokee tried to get tough when the light turned green. I got the jump on him, truck floored, pedal to carpet, I backed off the throttle at 6200 rpm's to upshift to second? I was waiting for the upshift and nothing! I've only had the truck for about 3 months, 21k on the odometer. Transmition shifts fine, no problems what so ever. On my previous truck, 2000 durango 4.7, at wot the shift would usually be at about 5300 rmp's. Is anything wrong or out of adjustment? I dont take it up that high normally, but I thought it would upshift much sooner, Thanks

 

Can't say I'd worry about it. Unless there's something jacked with your ECU, it won't let the truck hit red line (even though there's no actual red line marked on our tachs). When I had my 05 with the 6 speed trans, I hit the limiter quite a few times leaving lights and whatnot and, if I remember right, it was somewhere over 7000. So, to me, 6200R's doesn't seem ridiculous or anything for our trucks.

 

not to worry, i pull my 4.7 to 6800 before it will shift, thank god for sct tuning and 125 shot of nitrous. i beleive the factory shift is 5800, but not to sure

 

i am pretty sure your right superdak i have mine set at 6500 i think

 

I am kinda conservative, but I run mine up to 6200 rpms now...

 

sounds like it must have a chip in it, IIRC the stock setup will shift around 5800 and no later

 

And factory tachs are notoriously inaccurate. I had my Dak (2009) on the dyno the other day and my factory tach was reading 5900rpm when my crank pully was only spinning around 5450. Once the needle leaves idle it looses accuracy. The only part of your truck that gets a truly accurate RPM reading is the ECU and it passes that along to the tach that then has to reinterpret the signal and doesn't always keep up. The biggest difference I have ever seen are the Yamaha R6V's, the tach would read 16,500rpm while the ECU was logging ~14,100rpm

 

Great guys, thanks! I wont worry about it. Love the truck, dropped in a K&N filter and changed the front and rear shocks to the sensatracts. Will upgrade to larger tires as soon as the originals wear out. BTW, grand cherokee pulled me by half a car length.

 

ummm... damn it, you caught me!