Anyone try the TCI 6X 6speed

[68Punishergto]

Was wondering if anyone had tried 6X 6speed by TCI thinking about it for my car....... would love to hear thoughts

[SShep71]

I havent heard anything bad about it, but for what they are asking for one i am not suprised.

[Poorhousenext]

I have 6X in my 64 Vette.

6X is a close ratio automatic transmission. 2nd - 5th gear is similar to manual M20 close ratio tranmission. RPM retension between shifts is unmatched by any A4 automatic. Notice the drive ratio in each gear with 3.55 rear gear and what rear gear a T56 6 sp manual car would need to match the 6X ratio wise in 4th gear as well as come close in 2nd & 3rd. T56's 1st gear is it's only gear with better mechanical advantage than 6X, but it may be a little to much advantage as RPM lost between 1st to 2nd gear is huge even with perfect shift, taking engine out of it's power band. My 64 still has a 3.54 1:1 5th gear for a little more top end.

6X has average lost of 1600 RPM between shifts. Shift at 6500 RPM and engine RPM only falls back to 4900 +/- 100 RPM. Less converter stall needed, that may hurt 60" time when drag racing at strip, but sure doesn't hurt street fun factor...LOL

TCI 6X
2.97
2.23 -- 76.10% (high) RPM Retention -- 23.90% RPM DROP
1.57 -- 70.40% (high) RPM Retention -- 29.60% RPM DROP
1.18 -- 75.16% (high) RPM Retention -- 24.84% RPM DROP
1.00 -- 84.75% (high) RPM Retention -- 15.25% RPM DROP
0.75 -- 75.00% (high) RPM Retention -- 25.00% RPM DROP

TCI 6X, 3.55 rear gear

1st gear	2.97	3.55		10.54
2nd gear	2.23	3.55		7.92
3rd gear	1.57	3.55		5.57
4th gear	1.18	3.55		4.19
5th gear	1.00	3.55		3.55
6th gear	0.75	3.55		2.66

T56 man
1st gear	2.66	4.19		11.15	0.60
2nd gear	1.78	4.19		7.46	-0.46
3rd gear	1.30	4.19		5.45	-0.13
4th gear	1.00	4.19		4.19	0.00
5th gear	0.74	4.19		3.10	-0.45
6th gear	0.50	4.19		2.10	-0.57

Car only has 360 Peak HP at rear wheels, Converter is stalled at 2800 RPM so not much more flash than stock. You can hear engine rpm drop very few RPM between 1st/2nd and 3rd/4th shifts. When car shifted into 5th near top of the hill it was doing 132 MPH per tuners data logger. Use of Old School mechanical advatage to help make up for not having a lot of HP.

https://www.facebook.com/photo.php?v...type=2&theater

Shame 6x doesn't have engine braking. I also have the older 6X package that uses old TCI Red Box controler rather than TCI's EZ-TCU™ Transmission Control Unit currently shifted with trans. I believe the Red Box has more control over shifts than EZ does. Also stores two tunes selectable by use of toggel switch on dash to switch between a street tune or performance tune that has harder/harsher shifts for max RPM retention between shifts.

6X is not a slush box shifting automatic., it's a performance automatic for holding up to 850 HP without mods. More if ordered with mods.

[69cutlassrkt]

hey just wanted to mention PCS has a 6 speed valvebody for the 4l80e and it has engine braking.
https://www.powertraincontrolsolutio...ed-Valve-Body/

[Poorhousenext]

hey just wanted to mention PCS has a 6 speed valvebody for the 4l80e and it has engine braking.
https://www.powertraincontrolsolutio...ed-Valve-Body/

Kyle,

I'll have to look into the valve body. I know PCS made the TCI Red Box control module in my car, an they have worked with me or my builder in past on programing it. If valvebody will work with my 6X and now the big "IF", and :TCI will still honor "Lifetime warrenty agreement if 850 HP or less used, I'ed love to have one.

[68Punishergto]

Thanks for the input