Board index (Legacy) Predator Technical Discussion Predator GM Gas Transmission shift quickness

Transmission shift quickness

Predator support for GM gas vehicles

Moderators: mikel, 06MonteSS

Post Fri Mar 21, 2008 11:03 pm

Posts: 53
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

Image
1999 GMC Sierra. 5.3 V8. Regular Cab/Shortbed
-Fram Boost Intake System
-Straight Pipes
-DiabloSport Tuned

Post Sun Mar 23, 2008 11:27 am

Posts: 53
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

Post Sun Mar 23, 2008 11:36 am

Posts: 229
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...

Post Mon Mar 24, 2008 2:05 pm

Posts: 54709
Location: DiabloSport World Headquarters

???????
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
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST

Post Sun May 04, 2008 1:52 pm

Posts: 90
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.

Post Mon May 05, 2008 11:37 am

Posts: 54709
Location: DiabloSport World Headquarters

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

Thanks
Mike Litsch
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST

Post Mon May 05, 2008 6:03 pm

Posts: 90
Thats no adjustment on shift time and up to additional 25% increase pressure on the performance tune?

Post Tue May 06, 2008 11:44 pm

Posts: 19
good question I've been wondering that my self for my truck.

Post Wed May 07, 2008 2:28 am

Posts: 9
Mikel are you saying that on my U7195 adjusting the shift time does nothing then ???????????????????????????????????????

Post Wed May 07, 2008 11:36 am

Posts: 54709
Location: DiabloSport World Headquarters

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
Powerteq Customer Service Manager
Diablo Tech support by phone:
561-908-0040x4
M-F 8:00 AM to 5:00 PM EST

Post Mon Nov 05, 2018 8:24 am

Posts: 1

Nice information, thanks for this thread!
Just some suggestions that I hope will help.
4l60 rebuild kit


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