06 K24a2/5 speed into 06 Element questions

[mac the yankee]

Thank you for creating this site- y'all came highly recommended!!!

Just a bit of background- I'm 56, have grown up wrenching on all of my cars over the years (and worked in a restoration shop for a bit) and am comfortable with most mechanical jobs, but electrical has always been my kryptonite

I have an '06 Element with almost 300,000 miles and am hoping to replace my K24a4/4 speed auto with an '06 TSX K24a2/5 speed auto- here are my questions:

- Is it possible to transplant the TSX 5 speed auto if I use the TSX ECU and TSX engine/trans harness, or do I need to use the stock 4 speed auto and reflash the stock ECU?
- If I do need to use the stock 4 speed auto, are there any kits you recommend to rebuild/improve its' performance?... I do tow a light trailer occasionally and don't have a lead foot, but REALLY enjoy engaging the VTEC solenoids

[mac the yankee]

I found a thread on the Element owner's club site about a Facebook thread from 2019 where someone did a K24a2/2007-later Element 5 speed auto swap and used an RSX tune? Anyone have any info on that???

I would really love to do this swap, but don't want to make any mistakes- I'm a middle school band director on a limited budget

[KTuner]

The two transmissions aren't compatible with each other and we don't support the TSX AT on the older TSX, so I unfortunately have no suggestions for you. If someone managed to get something compatible using Element AT you'd have to rely solely on any information they posted about it.

[mac the yankee]

Thank you for your response!

So am I okay if I use my stock 4 speed with your KTune for the '06 TSX?

[KTuner]

Unfortunately what you're asking about isn't something I can recommend or offer advice for. Best case scenario you have a vehicle that shifts earlier than the engine normally would, so you're not taking full advantage of it.

[tesujin]

find steven crump on the facebook element mod forums for more information. He has transplanted a 5speed auto 2008 or above into his 2006 element. WITH a 2008 k24a2. he used the RSX mapping. I plan on doing this as well.