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Originally Posted by bdtowing  The transmission came out of a 05-06 cts-v LS2. I don't know if that helps. |
That is an awesome transmission but it won't mate up to a 5.0 motor easily. For one, the bolt pattern on the clutch housing is completely different and secondly, the input shaft is waaayyyy too short. GM's use a 6.5" long input shaft. The 5.0 bell housing is 6.925" deep. That means the input shaft would not engage the pilot bearing in the back of the crank and that is bad.
The next thing you have to overcome is the shifter location. On that T56, the shifter is too far rearward to fit a classic mustang. There is an access cover about 7" forward on the top of the transmission that the shifter can be moved to (we sell a relocation for this) but you would need to do some measuring. On a classic mustang, the shifter opening in the floor is 20.260" back from the front face of the transmission and .375"(3/8") offset toward the driver. Compare these measurements to the transmission and see if it will work.
Next up is the cross member mounting location. On a mustang, the cross member mounting pad is roughly 15 -3/8" back from the front face of the transmission, you will need to modify the cross member to have it mate up to the gear box.
Finally is the speedometer. The LS version T56 is electronic output ONLY. They make a converter box called a Cable X box which wires into the transmission and converts the signal from electronic and turns it back to mechanical and you can run a speedo cable from the box up to the gauges. It runs $300 (we have this also).
If you are really serious about making this work, start by contacting Ross at Quick Time. Quick Time makes scatter shield bell housing and they have a bell housing for just about any application you can come up with. I checked and it looks like maybe their RM-6050 might work. It has the correct depth for the GM input of 6.3" and it has the GM bolt pattern on the back of it and the 5.0 pattern on the front of it. It uses the standard 5.0 157 tooth flywheel and clutch fork. You can check it out at
www.quicktimeinc.com
Keep in mind, that LS version T56 has a 2.66 1st, 1.78 2nd, 1.30 3rd, 1:1 4th, .74 5th and a .50 6th..... you will need to run AT LEAST 3.90 or 4.10 rear gear in order to utilize 6th gear....
On paper, a .50 6th gear sounds great but in reality, most engines are not set up to run at that low of an rpm...
If you figure a 3.55 rear gear and a 26" tall tire, you're looking at 1600rpm's at 70 mph in 6th gear. Heck my daily driver, 2000GT won't pull itself at 1600rpm. I'd get run over if I pulled out to pass someone at that low an rpm
. With a 4.11 and a 26" tall tire, you're at 1900 rpm to hit 70mph which is a little better.
We have a speed analyzer at out website here,
ford transmission swaps | tremec | mopar restoration parts | automatic transmission, camaro transmission that you can play with to get the idea.
Good luck and let me know if I can be of further assistance.
Richard
Tech Support
Tremec TKO, T45 & T56 Transmission Systems
T-56 transmission on a 65 mustang fastback with 5.0L motor 
(thanks 2 IhaveadopeGT)
