I am in the process of having my tranny rebuilt, I am having it beefed up a little and putting in a shift kit. Is anyone here running a gryphon/edge or other programmer in a vehicle with a shift kit installed? Currently I run canned tow/haul(level 2) 99% of the time, this increases line pressure for firmer shifts but with kit installed I am thinking I may need to back off of this. Any advice other than getting custom tunes on what I may want to set shift firmness values to on canned tunes? Also do the values for shift firmness have any correlation to factory values starting from 0, where 0 is stock and - is a decrease in pressure and + and increase or are those values not relative to any factory parameters?

I am sure I will know more once I actually start driving it, but hopefully this gets me some good advice and/or a starting point.

 

I would start off by returning the tune to stock and see how it shifts, go from there. Otherwise, I'd call Bill and ask him.

 

Bill once said, several years ago, that the "shift firmness" in the Edge/Gryphon did NOT do anything with the shift PRESSURE. What it does, is decrease or increase the time between clutch band release and lockup. And the percentages are related to time. So, if you were to increase the shift firmness by 10%, it decreases the time from unlock to lock by 10%. If the stock time is 500 msec (1/2 sec), increasing the firmness by 10% would decrease that time to 450 msec.

Hope this helps - personally, I'd follow glc's advice and try things out with the stock tune first. Then, if you load a tune, I'd reset the shift firmness to stock (0%) at all shift points and see how it feels.

Calling Bill is always a good idea - you MAY need a custom tune with a shift kit.

Also, I think 88racing once installed a shift kit while he had PHP tunes. You might want to PM him.

- Jack

 

Thanks glc and JackandJanet

Appreciate for the info, this is pretty much exactly what I was looking for. I returned the truck to stock programming prior to taking it to the shop where the work was being done. When I pick it up it will remain stock until I get a feel of how it is after the work. From there I will do just like you said and go back to tow/haul and set shift firmness back to 0 between all gears and drive it there, ideally it should feel/shift the same as it does at stock with the shift kit and the added benefit of the other modified parameters that come with the tune (i.e shift rpm, timing advance, etc). If I feel like it should be a little firmer I can then tweak it or give Bill a call, I will probably PM 88 as well.

I will make sure to post back what my findings are.