4R100 Slushbox Problem

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Nov 17, 2008 | 09:36 AM

#31

brian42

Lead Driver

Joined: Dec 2006

Posts: 7,092

Likes: 145

From: San Diego, CA

Quote:

Originally Posted by dkf

Guys I'm completely aware of valve bodies and etc for the 4R100. I just removed the factory tech accumulator from my truck. The FT unit only firms up shifts at the shift point thats it. Everything else is left stock and the TQ slips like a ***** and unlocks constantly. Tuning should be done in conjuction with a VB or other mechanical mod but its a somewhat long process to tweak everything so it works good. I did like the shift firmness with my FT VB but decided to remove it because getting the VB and tuning perfect was a PITA.

A tuner is very safe for the drivetrain, trans included IF you don't go wild on the shift pressures and torque modulation and pressure is increase at the shift point only. The majority of shops that do custom tuning know where the line is.

I monitor trans line pressure on my Scangauge and there is little difference in line pressure between my FT VB with stock trans settings and the tune I'm running now.

Good to know, thanks for the info.

Nov 17, 2008 | 10:09 AM

#32

ReAX

Post Fiend

Joined: May 2006

Posts: 10,007

Likes: 4

From: Central Florida

I've always been told that running a shift kit and trans options in a tune was bad for the transmission. When I was hearing this, I was working on Chevy Impala SS and Caprices, with transgo kits and Hypertech tuners, but I figured it worked across.

What can our trans handle in tune plus valvebody tweaking?

Nov 17, 2008 | 10:24 AM

#33

dkf

Hotshot

Joined: Mar 2007

Posts: 10,101

Likes: 40

From: Pa

You can't just run a plain old canned tune with a mechanical modification like an accumulator upgrade and etc. You have to get into custom tuning and leave the trans firmness stock or you can even take out some firmness if desired, other parameters need to be tweaked also. Off the shelf tuners just don't have the flexabiltiy espcially tuners from edge, hypertech, superchips and etc. Have to have the software and know how to make the tune and then reflash the truck with the tuner. Its a trial and error kind of thing and you have to know what your doing. I was getting a clunk on throttle transition with the VB and custom tuning and didn't have the time to mess with it nor the software.