[Jackpine]

Originally Posted by fisherman

I've had my gryphon for a couple of weeks now, enjoying it with no problems........ Until this morning. Now the truck makes a weird whining noise and will not shift into 3rd gear. 1-2 is fine, then when its time for third, the tranny slips bigtime. Like it goes into neutral, if you give it gas it just revs up, and sometimes it pounds into a gear with a harsh thud.

Did running my shift firmness at 14 destroy my transmission?? I havent been real hard on it. Just having fun with the new shifting patterns. Btw, I set 1-2 at 5700, 2-3 at 5500, and 3-4 at 5400 all with shift firmness at 14.

First, are you serious with these numbers?

Your torque converter is going to start ballooning at 5400 rpm, according to everything I've read on the subject. To make your transmission shift properly at WOT, you'd need to have your max RPM set to no less than 6100 RPM. This sounds like a recipe for disaster.

And, what engine do you have in your truck? If it's the 5.4L, you are already on the downside of the torque and HP curve at 5000 rpm, why go higher?

Bill has commented on setting the shift firmness too high. The canned tunes in the Gryphon have already firmed up the shifts quite a bit. If you add more to that, you can put serious stress on the drivetrain. Bill has also said that the 3-4 upshift firmness should be quite a bit less than the settings for the other two shifts.

Did you notice the big red warning in the Gryphon manual about making adjustments to these settings in the Custom Options menu?

If I were you, I'd return the tune to stock, immediately! Find out what the truck is doing now. I'd also have a dealer do a thorough inspection and probably a flush of your transmission. You may be in for a rebuild.

If so, it was NOT the fault of the Gryphon!

And, if you're just winding me up to see my reaction, you've seen it!

- Jack