6 Speed swap

For the money spent and ur mods... dont' do it. It shouldn't hurt ur times although I imagine a t56 would be just a tad heavier than a t45/3650. I'd say if ur going to swap, buy a tko 600 with a 2.95 1st... u can still get a good over drive gear and keep ur mileage respectable.

TKO 600 SUCKS!!!!

my buddy tore his out 4 times before he swapped to a Viper T56.
he's been running it with no issues. my viper T56 is also running strong after 2 years

I dont car for how my viper spec shifts. I could shift way faster with the five speed. But I dont beat on my car anymore so maybe I just havent learned to shift it yet. I was actually thinking of swaping to a tko-600 but it sounds like I should do some research about them first.

My car felt faster with the 5 in it but since it not a track car the 6 makes it so much nicer to tool around town being my daily.

3.90 and a 6 speed...you'll prolly have to do some mad shifting. I saw a 95 Cobra with a 4.10 and a 6speed at the track and he said he was in 5th at the red line when he crossed the 1/4 mile mark. His 1st and 2nd gear were completely useless. I'd step down to a 3.55 or 3.73 gear with a 6speed.

Chances are, your 5 speed will feel faster, as the transmission gear ratios are a little different.

T 56 - 1st - 2.97 2nd - 2.07 3rd - 1.43 4th - 1.00 5th - .80 6th - .62
T 45 - 1st - 3.37 2nd - 1.99 3rd - 1.33 4th - 1.00 5th - .67

In my 98 Cobra, the 1st gear is harder as I have to give it some more revs to get it moving like it used to. If you're going to be dragging it a lot, you may get better times in your T 45. Where the T 56 really shines is in higher speed races (highway) where you're coming out of 4th. In the T 45 it'll fall flat on its face with a huge jump into its overdrive, where the T 56 will actually have a pretty usable 5th and start walking away with it. That really seems to piss off the Foxbody guys where they have an equal car, but lose because of the transmission running out of gear.

The T 56 also allows you to run some higher rear gears and not sacrifice as much street drivability, because you have those extra gears and a deeper overdrive. I'm not saying modular cobra/5 speed guys haven't ever run 3.73, 4.10, or 4.30 before, but they now don't have to cruise the highway at 3k rpm just to do the speed limit. Personally, I think the T 56 is a great transmission and wouldn't ever consider using anything else... unless they make a T 67 7 speed

SVT32VDOHC said:

3.90 and a 6 speed...you'll prolly have to do some mad shifting. I saw a 95 Cobra with a 4.10 and a 6speed at the track and he said he was in 5th at the red line when he crossed the 1/4 mile mark. His 1st and 2nd gear were completely useless. I'd step down to a 3.55 or 3.73 gear with a 6speed.

Click to expand...

thats my setup. 3.90's and a 6 speed.

i'm crossing the traps in 4th at under 6000 rpm at 125 mph. no extra shifting required