# Make Your Auto 240 fly **URL:** \ **Category:** SON240sx Automotive\ **Created:** [June 30, 2004, 8:26am UTC](https://forums.speedlife.net/t/make-your-auto-240-fly/81215 "2004-06-30T08:26:31Z")\ **Posts on this page:** 1\ **Showing post:** 36
**Author:** ![Mr.K](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr.k/32/5670_2.png) [@Mr.K](https://forums.speedlife.net/u/Mr.K)\ **Post date:** [December 12, 2007, 8:25am UTC](https://forums.speedlife.net/t/make-your-auto-240-fly/81215/36 "2007-12-12T08:25:29Z")
> [@Should i sell the ///M?](https://forums.speedlife.net/t/should-i-sell-the-m/15208/11): > > gts- no problem dude , > > and mr.k , whats the difference if u do the shift kit your self or u pay a company to do the same thing, give u a pre modified one and pay like 500bucks? There are a few different kinds of shift kits. I’m speaking from my experience with F-bodies, but most of this stuff should carry over. There are 2 different kinds of shift kits that I’ve seen: -1 is a simple line pressure booster that can be had for about $45-50. This runs a switch into your interior that you can change to set how firm you want the shifts to be. These are pretty effective for truck/towing usage. These up line pressure. > **[Amazon.com: B&M 70380 ShiftPlus Electronic Shift Improver : Automotive](https://www.amazon.com/70380-ShiftPlus-Electronic-Shift-Improver/dp/B000CIMH1A)** > > B&M 70380 ShiftPlus Electronic Shift Improver -2 is an actual shift kit, and it has a bunch of springs and different stuff that you actually have to install inside of the transmission. These extend the life of the transmission under heavy use and can make the shifts pretty brutal. if you’re pumping out a bunch of horsepower you’re going to need to upgrade the transmission itself still, but this helps improve the shifts quite a bit for some serious 1-2 shifts. [http://rides.webshots.com/album/228146776wFWLqX](http://rides.webshots.com/album/228146776wFWLqX) Neither one of these cost $500. --- _[View the full topic](https://forums.speedlife.net/t/make-your-auto-240-fly/81215)._