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Old 03-08-2007, 09:33 PM   #1
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T-56 Conversion

I can't figure out if there is a special t-56 that is needed for a swap or what is needed to complete a t-56 for a t-5 swap.

If there is anybody out there that has successfully completed this conversion, let me know what I can do to make it happen.

BTW, I have a 1991 GT with a stock t-5.
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Old 03-08-2007, 09:38 PM   #2
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Re: T-56 Conversion

I'm pretty sure that all you need is to have the correct bellhousing. As a big auto advocate, however, I'm not absolutely sure.
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Old 03-08-2007, 09:43 PM   #3
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Question Re: T-56 Conversion

I know the transmission that I buy will have to be from a ford, more than likely.

Can I use a t-56 from a 2003-04 cobra?
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Old 03-10-2007, 11:08 PM   #4
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Re: T-56 Conversion

yes, I however don't know what all it takes, nose around on some of the other v8 sites and find out.

it'll be much cheaper to go TKO
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Old 03-11-2007, 12:17 PM   #5
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Re: T-56 Conversion

It just takes the tranny, shorter drive shaft, and then to fab the tranny supports. It's not a ton of work really once you have the parts. Being a fox though, you MIGHT have to make some room in the tranny tunnel....but other than that, it shouldn't be too bad.
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Old 03-11-2007, 06:58 PM   #6
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Re: T-56 Conversion

you also have to ask yourself the question as to why you want a 6 speed. It really doesnt make the car faster in a straight line and its heavier and the ford version is not geared as good as the GM version etc etc.
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Old 03-11-2007, 09:13 PM   #7
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Re: T-56 Conversion

I'd even consider using the Viper spec T56.....but thats alot more price wise
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Old 03-11-2007, 09:31 PM   #8
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Re: T-56 Conversion

The gearing really isnt super amazing or anything on the ford spec ... they moved the 1 to 1 ratio to 5th and 4th is like .86 then 6th is .63 or something... just imagine if 6th was .50 I would probably pick up 3mpg.
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Old 03-11-2007, 09:46 PM   #9
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Re: T-56 Conversion

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Originally Posted by SpectorV View Post
The gearing really isnt super amazing or anything on the ford spec ... they moved the 1 to 1 ratio to 5th and 4th is like .86 then 6th is .63 or something... just imagine if 6th was .50 I would probably pick up 3mpg.
Who put 1:1 to 5th?

I think you have your numbers backwards though.

4 = .86
5 = 1.0
6 = .63

That would make no sense at all.

Ford is 1.0 in 4th gear...don't know the viper spec off the top of my head, but I am 99% sure 4th is 1.0 there as well just with a .5 6th instead of a .63.
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Old 03-11-2007, 09:50 PM   #10
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Re: T-56 Conversion

sorry thats what I ment 1.0 in 4th for a T-5 etc vs 1.0 in a 5th

BTW did you hit 500rwhp/tq as your avatar suggests or a future goal for your next dyno now that you have your new mods?
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Old 03-11-2007, 10:00 PM   #11
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Re: T-56 Conversion

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Originally Posted by SpectorV View Post
sorry thats what I ment 1.0 in 4th for a T-5 etc vs 1.0 in a 5th

BTW did you hit 500rwhp/tq as your avatar suggests or a future goal for your next dyno now that you have your new mods?
At 500 rwhp now...just not quite the 520 I wanted. TQ is 487 I think...I don't remember, dude hasn't sent my damn graph yet.

And, T5 and T56 are both 1.0 in 4th...your car, my car, my buddies car with a cobra spec T56....are all 1.0 in 4th.
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Old 03-11-2007, 10:32 PM   #12
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Re: T-56 Conversion

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Originally Posted by SpectorV View Post
you also have to ask yourself the question as to why you want a 6 speed. It really doesnt make the car faster in a straight line and its heavier and the ford version is not geared as good as the GM version etc etc.
I plan to do head/cam/intake swap on the car and a few other things like fuel pump and injectors. Its my daily driver so I would like to get the best gas mileage possible.

Plus it would be cool to have a t-56 in a fox. Nobody around here has one in their's.
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Old 03-12-2007, 07:13 AM   #13
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Re: T-56 Conversion

If you really want better gas mileage, get the Viper Spec with the .50 overdrive. Otherwise, you are pretty much wasting your time.
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Old 03-12-2007, 08:19 AM   #14
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Re: T-56 Conversion

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Originally Posted by bbunt302 View Post
If you really want better gas mileage, get the Viper Spec with the .50 overdrive. Otherwise, you are pretty much wasting your time.
But will that extra .13 really make that much difference? What are we talking, about 50 rpms maybe?
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Old 03-12-2007, 11:45 AM   #15
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Re: T-56 Conversion

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Originally Posted by PureVenom View Post
T5 and T56 are both 1.0 in 4th...your car, my car, my buddies car with a cobra spec T56....are all 1.0 in 4th.
The T-5 has a 1.0 4th the T-56 has a 1.0 5th.
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Old 03-12-2007, 11:48 AM   #16
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Re: T-56 Conversion

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The T-5 has a 1.0 4th the T-56 has a 1.0 5th.
Don't make me prove you wrong again Spec. 4th is 1.0 in our cars. We have 2 overdrive gears.

We had this discussion in another thread a long time ago...and I gave you a link to the site will all the ford tranny gear ratios.

The craparo version of the T56 is also a 1.0 4th. I am quite sure the viper spec is as well since Cody @ Stang Hi has a viper spec T56 is his 95 cobra and his 4th is 1.0.

:beer:
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Old 03-12-2007, 11:49 AM   #17
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Re: T-56 Conversion

All the T56s in the F-Bodies and the 'vettes have a 1:1 4th gear, and two overdrives.
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Old 03-12-2007, 11:49 AM   #18
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Re: T-56 Conversion

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Originally Posted by MarkuzLS1 View Post
All the T56s in the F-Bodies and the 'vettes have a 1:1 4th gear, and two overdrives.
I'm not alone!!!!
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Old 03-12-2007, 11:55 AM   #19
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Re: T-56 Conversion

Here are a couple of sources...more could be found if wanted...but...here you go:

Borg Warner 6sp T-56 Gear Ratios (GM T56 I believe)
1st 2.66:1
2nd 1.78:1
3rd 1.30:1
4th 1.00:1
5th 0.74:1
6th 0.50:1

Source: Borg Warner T-56 Gear Ratios

Ford T-56
T56 Gear Ratios
1 2.97
2 2.07
3 1.43
4 1.00
5 0.80
6 0.62
Reverse 2.90
Source: Tremec T56 Install - StangNet - The Mustang Network
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Old 03-12-2007, 12:46 PM   #20
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Re: T-56 Conversion

damn it I knew all of this and you just got me confused....
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Old 03-12-2007, 04:51 PM   #21
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Re: T-56 Conversion

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Originally Posted by PureVenom View Post
But will that extra .13 really make that much difference? What are we talking, about 50 rpms maybe?
Try about 400 @ 70 mph with 3.73s and a 25.6" tire.
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Old 03-12-2007, 06:22 PM   #22
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Re: T-56 Conversion

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Try about 400 @ 70 mph with 3.73s and a 25.6" tire.
400? I drop about 200 or so from 5th to 6th...and that is about twice that difference. I guess maybe with 3.73 it could be different.
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Old 03-12-2007, 06:35 PM   #23
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Re: T-56 Conversion

Even with 3.27s, it's a drop of 360 RPM.

Engine RPM Calculator
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Old 03-12-2007, 06:36 PM   #24
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Re: T-56 Conversion

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Even with 3.27s, it's a drop of 360 RPM.

Engine RPM Calculator
Well, I am just basing it on my Tach...:dunno:
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Old 03-12-2007, 10:56 PM   #25
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Re: T-56 Conversion

400 RPM is a pretty big drop...i know i'd like that when im crusin on the highway....the least i do on the highway is 70, im usually crusin 80-85...i have 3.73's and at 80 im turnin 2700-2800 RPM
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Old 04-16-2007, 11:21 PM   #26
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Re: T-56 Conversion

there is a tech in muscle mustangs and fast fords on how to install a t56 in a fox it don't look to be to badd i prefur a tko 600
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