Transmission shift quickness

Predator support for GM gas vehicles

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Wizeguy28
Posts: 53
Joined: Tue Feb 26, 2008 5:41 pm

Transmission shift quickness

Post by Wizeguy28 »

Ok, so I just got my 4l60e rebuilt for, better sit down for this one, $1,710. The guy rebuilt the thing, and replaced all the weakest parts (that usually cause this particular transmission to fail), with higher strength parts. Sun gear shell(s), bands, couple other things as well. He also included a very mild shift kit to keep the clutches from wearing quicker. My question is, when programming with the predator to make your transmission shift quicker (this is done by raising the transsion mission fluid speed in the transmission if i'm not mistaken), will this damage anything? Would it be recommended to do a valve body upgrade? I've heard of several other guys in here turning up their line pressure a bit and then throwing codes, or blowing solenoids or what not. After paying as much as I did, I'm sure every one of you guys understand my hesitation is making the tranny shift faster, lol. I just want to speed up the shift a little, so it doesnt feel like i'm loosing 3-5 mph between each shift, haha. I may just end up calling that vince dude from finish line transmissions again, but i hate to bother him with such elementary questions. So let me know what you guys think. I know mike and lew admit to not knowing a whole lot about transmissions, but you other guys out there, i'd appreciate your inputs. Thanks.
University of Northwestern Ohio. High Performance Program

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1999 GMC Sierra. 5.3 V8. Regular Cab/Shortbed
-Fram Boost Intake System
-Straight Pipes
-DiabloSport Tuned
Wizeguy28
Posts: 53
Joined: Tue Feb 26, 2008 5:41 pm

RE: Transmission shift quickness

Post by Wizeguy28 »

bump
University of Northwestern Ohio. High Performance Program

Image
1999 GMC Sierra. 5.3 V8. Regular Cab/Shortbed
-Fram Boost Intake System
-Straight Pipes
-DiabloSport Tuned
jsk06c6
Posts: 229
Joined: Wed Jun 20, 2007 7:03 pm

RE: Transmission shift quickness

Post by jsk06c6 »

Don't play with fluid pressures or your going to be re-building again. Get the shift kit and do it right.

BTW, $1700 for the good parts in a rebuild was a pretty good deal...
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mikel
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RE: Transmission shift quickness

Post by mikel »

???????
HUH?
Shift pressure is an auto trannies best friend.
Stock, slow shifts = heat being built in the tranny.
Heat is the NUMBER 1 enemy of an automatic transmission, period.
Increasing line pressure to make shifts firmer (read: not slipping into gear) causes much less heat to be built in the tranny, thus extending tranny life.

Thanks
Mike Litsch
DiabloSport Brand Manager
Diablo Tech support by phone:
561-908-0040
M-F 8:00 AM to 5:00 PM EST

tech@diablosport.com
rickssz
Posts: 90
Joined: Sat Apr 12, 2008 10:42 am

RE: Transmission shift quickness

Post by rickssz »

mikel wrote:???????
HUH?
Shift pressure is an auto trannies best friend.
Stock, slow shifts = heat being built in the tranny.
Heat is the NUMBER 1 enemy of an automatic transmission, period.
Increasing line pressure to make shifts firmer (read: not slipping into gear) causes much less heat to be built in the tranny, thus extending tranny life.

Thanks
Whats the average that the pressure should be increased to and and what does the shift time change or adjust and whats an average setting.
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mikel
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RE: Transmission shift quickness

Post by mikel »

Shift time is already set to the max quickness in the tunes, pressure may be increased by the full amount.

Thanks
Mike Litsch
DiabloSport Brand Manager
Diablo Tech support by phone:
561-908-0040
M-F 8:00 AM to 5:00 PM EST

tech@diablosport.com
rickssz
Posts: 90
Joined: Sat Apr 12, 2008 10:42 am

RE: Transmission shift quickness

Post by rickssz »

Thats no adjustment on shift time and up to additional 25% increase pressure on the performance tune?
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Hotrod2004
Posts: 19
Joined: Thu Feb 14, 2008 1:44 am

RE: Transmission shift quickness

Post by Hotrod2004 »

good question I've been wondering that my self for my truck.
spy0068
Posts: 9
Joined: Fri Feb 15, 2008 4:09 pm

RE: Transmission shift quickness

Post by spy0068 »

Mikel are you saying that on my U7195 adjusting the shift time does nothing then ???????????????????????????????????????
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mikel
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Re: RE: Transmission shift quickness

Post by mikel »

spy0068 wrote:Mikel are you saying that on my U7195 adjusting the shift time does nothing then ???????????????????????????????????????
Increasing it does nothing, you can slow it down if you wanted to...
Mike Litsch
DiabloSport Brand Manager
Diablo Tech support by phone:
561-908-0040
M-F 8:00 AM to 5:00 PM EST

tech@diablosport.com
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