Go Back   MustangForums.com > Ford Mustang Tech > 4.6L (1996-2004 Modular) Mustang > 4.6L General Discussion
Sign in using an external account
Register Forgot Password?
Search


4.6L General Discussion This section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.

Welcome to Mustang Forums!
Welcome to Mustang Forums.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join our community today!


T-45 to T-56

Reply
 
 
 
 
Thread Tools Search this Thread
Old 04-07-2012, 01:10 AM   #1
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default T-45 to T-56

So I did a search and didn't find much info on this so here it is. I just did 4.10's and now that I'm turning more RPM's and my clutch will probably be taking a crap soon (car has 84k on the factory clutch/TOB) I was thinking T-56.

I like the gear ratios from the 97+ Camaro/Firebird (I think it was those years... whatever years had the following ratios... 2.66, 1.78, 1.30, 1.00, .74, .50 ) and I was wondering what it takes to do a swap like this if it's even possible from one of those cars.

I know shorter drive shaft and a different clutch due to 26 spline with a cobra cross member, but will the bell housing have to be changed or will it bolt to a mod motor or can it not even be changed? What else would have to be changed an or does anyone have a list as to what has to be done? Will all electronics plug in and will it fit right etc. Any info will help as I pretty much know nothing about what really has to be done. I saw Jazzers thread, but I'm wondering if anyone has a list and if/how the GM trans is different.

TIA
This ad is not displayed to registered or logged-in members.
Register your free account today and become a member on Mustang Forums!
69MustangCoupe393cid is offline   Reply With Quote
Old 04-07-2012, 06:56 AM   #2
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

The trans should be the same, but the BH differs on a GM.

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-07-2012, 11:33 AM   #3
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default

Quote:
Originally Posted by Jazzer The Cat View Post
The trans should be the same, but the BH differs on a GM.

Jazzer
Thanks jazzer. Do you have a list of all the parts needed to swap over to the t56?
69MustangCoupe393cid is offline   Reply With Quote
Old 04-07-2012, 12:39 PM   #4
Jazzer The Cat
Retired Moderator
 
Jazzer The Cat's Avatar
 
Join Date: Jun 2006
Vehicle: '02 s281 #0014
Location: SF Bay Area
Posts: 9,233
Default

I purchased my trans new, along with the BH and cross-member from Modern Driveline. You already saw my swap thread and everything I had to do, is all written up in there

Jazzer
Jazzer The Cat is offline   Reply With Quote
Old 04-07-2012, 01:47 PM   #5
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default

Reading your thread Jazzer I think you made the right choice in the gear ratios for sure. The GM trans is going to almost completely ruin the point in me having 4.10's because of how high the gearing is. Yeah OD is nice, but the rest of the gearing makes the car act almost as if it had only 3.55's with my stock trans.

Bang for the buck it's looking like swapping to a 3650 with a .62 OD gear is going to make more sense for me. The T-56 you have will certainly be better, but for the money it's probably not worth it for me for the little extra speed I'll get out of it. I don't mind the jump from 4th to 5th and it's going to save me a bunch of money. Guess I'll wait for the day I buy a terminator to have a t-56.
69MustangCoupe393cid is offline   Reply With Quote
Old 04-13-2012, 12:37 AM   #6
Bman2000
4th Gear Member
 
Join Date: Apr 2009
Vehicle: 2000 mustang gt
Location: oregon
Posts: 1,498
Default

my 2 cents. first off im not sure the gm tranny can swap....i mean without changing almost everything on it. bh and tail shaft housing are different, and plugs may be too. In any case, i swapped to one out of a cobra i believe. The swap is simple, and i did it for the close ratio gears, i have 3.90s. so i run almost factory rpm at speed .62od? i cant remember. Either way i just want to say this, i put it in cuz i thought it would make a difference in accel due to better gear spacing. Well my car isnt modified enough i guess, it actually slowed me down due to the extra weight and drag. might be worth it for road racing but drag racing, its a loss over a 5 speed. i have a turbo fox friend that swapped and he lost a few tenths in the quarter.
__________________
1000s forged 5.0 teksid build
Melling hp oil pump 7 qt pan
Stage 3 mhs ported heads oversized manley beadlock valves
Stage 3 sc cams (degreed)
Victor jr intake hand blended, sheet metal upper, 75mm tb eddy fuel rails deka 60#injectors
BBK lt headers
Vortech si trim 3.25 upper innovators west 10%od crank pullie
Tread stone Fmic, custom discharge/intake tubes with tial q 50mm bov. Hpx slot style maf.
Lethal performance budget return system with twin aeromotive stealth 340 pumps.
Bman2000 is offline   Reply With Quote
Old 04-14-2012, 11:55 PM   #7
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default

Quote:
Originally Posted by Bman2000 View Post
my 2 cents. first off im not sure the gm tranny can swap....i mean without changing almost everything on it. bh and tail shaft housing are different, and plugs may be too. In any case, i swapped to one out of a cobra i believe. The swap is simple, and i did it for the close ratio gears, i have 3.90s. so i run almost factory rpm at speed .62od? i cant remember. Either way i just want to say this, i put it in cuz i thought it would make a difference in accel due to better gear spacing. Well my car isnt modified enough i guess, it actually slowed me down due to the extra weight and drag. might be worth it for road racing but drag racing, its a loss over a 5 speed. i have a turbo fox friend that swapped and he lost a few tenths in the quarter.
That's why I'm sticking with the 3650. The T-56 ratios need at least 4.10's. Basically your car is acting as though it has almost stock gears because you lost the tall gears down low. The t-56 is ok in a higher HP car because it can make use of the longer gears. My car doesn't have enough power to rip tires off like crazy so I need the gearing to help out.
69MustangCoupe393cid is offline   Reply With Quote
Old 04-15-2012, 02:11 AM   #8
Bpohlman13
3rd Gear Member
 
Bpohlman13's Avatar
 
Join Date: Mar 2010
Vehicle: 2003, Ford, Mustang Gt
Location: California
Posts: 611
Default

Hmm why did my posts get deleted? Thats weird. Oh well. The 3650 is probably best for you if you dont plan on making high power levels. Only reason I got the t56 magnum is because I wanted a 6 speed and needed to handle the power when i put my new engine in my car.
__________________

Mods: Built Cobra IRS, Tremec T-56 Magnum

Future Mods: My version of an Aluminator Engine with a M122 supercharger
Bpohlman13 is offline   Reply With Quote
Old 04-15-2012, 11:04 AM   #9
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default

Quote:
Originally Posted by Bpohlman13 View Post
Hmm why did my posts get deleted? Thats weird. Oh well. The 3650 is probably best for you if you dont plan on making high power levels. Only reason I got the t56 magnum is because I wanted a 6 speed and needed to handle the power when i put my new engine in my car.
ah. Ok didn't notice the build. That should be a nice setup. The stock trans would rip through the gears too fast and make it pointless to use first and second gear as they would result in tire smoke.
69MustangCoupe393cid is offline   Reply With Quote
Old 04-15-2012, 03:46 PM   #10
Bman2000
4th Gear Member
 
Join Date: Apr 2009
Vehicle: 2000 mustang gt
Location: oregon
Posts: 1,498
Default

actually it doesnt act like a stock tranny, the gear spacing was much better to keep this motor in the power band thats why i went with 3.90s and the t-56 because now when i shift at 5800 its drops right on peak tq around 4k-4200 so the hope was that i would keep the car moving better because when i shifted i wouldnt be going all the way down to 3500or so which is what the factory stuff does. the problem was just the weight and parasitic loss. so for a road track car, it probebly would pick up time, but as a drag car it lost some.
__________________
1000s forged 5.0 teksid build
Melling hp oil pump 7 qt pan
Stage 3 mhs ported heads oversized manley beadlock valves
Stage 3 sc cams (degreed)
Victor jr intake hand blended, sheet metal upper, 75mm tb eddy fuel rails deka 60#injectors
BBK lt headers
Vortech si trim 3.25 upper innovators west 10%od crank pullie
Tread stone Fmic, custom discharge/intake tubes with tial q 50mm bov. Hpx slot style maf.
Lethal performance budget return system with twin aeromotive stealth 340 pumps.
Bman2000 is offline   Reply With Quote
Old 04-15-2012, 06:39 PM   #11
LilRoush
6th Gear Member
 
LilRoush's Avatar
 
Join Date: Feb 2007
Vehicle: Roush
Location: South FL
Posts: 8,528
Send a message via AIM to LilRoush
Default

Quote:
Originally Posted by 69MustangCoupe393cid View Post
That's why I'm sticking with the 3650. The T-56 ratios need at least 4.10's. Basically your car is acting as though it has almost stock gears because you lost the tall gears down low. The t-56 is ok in a higher HP car because it can make use of the longer gears. My car doesn't have enough power to rip tires off like crazy so I need the gearing to help out.
I run 3.55's with my T56. Works great for my needs.
__________________
~Matt
1998 Roush: M112'd Aluminum block 4.6L 2V 6 speed track car
1999 SVT: Mostly stockish
1970 Mach 1: Resto-modded monster

2000 Roush #5004 - World's FIRST M112'd V6 Mustang. Sold, but not forgotten.
LilRoush is offline   Reply With Quote
Old 04-15-2012, 11:34 PM   #12
teej281
4.6L Section Moderator
 
teej281's Avatar
 
Join Date: Nov 2007
Vehicle: 2002 Mustang GT Convertible
Location: South Central PA
Posts: 10,280
TJ Brillhart
Default

Quote:
Originally Posted by 69MustangCoupe393cid View Post
So I did a search and didn't find much info on this so here it is. I just did 4.10's and now that I'm turning more RPM's and my clutch will probably be taking a crap soon (car has 84k on the factory clutch/TOB) I was thinking T-56.

I like the gear ratios from the 97+ Camaro/Firebird (I think it was those years... whatever years had the following ratios... 2.66, 1.78, 1.30, 1.00, .74, .50 ) and I was wondering what it takes to do a swap like this if it's even possible from one of those cars.

I know shorter drive shaft and a different clutch due to 26 spline with a cobra cross member, but will the bell housing have to be changed or will it bolt to a mod motor or can it not even be changed? What else would have to be changed an or does anyone have a list as to what has to be done? Will all electronics plug in and will it fit right etc. Any info will help as I pretty much know nothing about what really has to be done. I saw Jazzers thread, but I'm wondering if anyone has a list and if/how the GM trans is different.

TIA
The gear ratios that you're talking about I know are the Viper Spec ratios. Also, unless you are swapping the input shaft, the Ford trans came with a 10 spline input shaft, whether or not it was a T45, T3650, or T56. Also, the clutch should last longer now that you have 4.10's anyways. Its easier on taking off at stoplights as it takes less to get the car moving with the gears multiplying the torque more.

For our cars, if you're talking 1/4 mile times, then you wouldnt want a T56 for a stock power car. They gave the GT's a low 1st gear for a reason...to get you out of the hole quicker. If you have the longer 1st gear ratio, you take that away and lengthen your 60ft time, and if that goes down, chances are that you will lose time at the end as well. Plus its heavier. Now road racing, the gear ratios might benefit. But not for straight line racing unless you have the power that you need the taller 1st gear and closer ratios.
__________________





Member of Team IRS-GT #2

Quote:
Originally Posted by PurpleIcedGT View Post
Saying there is a 1whp difference between the X and H and trying to justify it as a performance difference, is like walking 100 feet to your car and eating a cheeseburger while saying its fine because you just did "cardio".
teej281 is offline   Reply With Quote
Old 04-17-2012, 04:45 PM   #13
69MustangCoupe393cid
4th Gear Member
 
Join Date: Nov 2006
Location:
Posts: 1,157
Default

Quote:
Originally Posted by LilRoush View Post
I run 3.55's with my T56. Works great for my needs.
Not for mine. lol

Quote:
Originally Posted by teej281 View Post
The gear ratios that you're talking about I know are the Viper Spec ratios. Also, unless you are swapping the input shaft, the Ford trans came with a 10 spline input shaft, whether or not it was a T45, T3650, or T56. Also, the clutch should last longer now that you have 4.10's anyways. Its easier on taking off at stoplights as it takes less to get the car moving with the gears multiplying the torque more.

For our cars, if you're talking 1/4 mile times, then you wouldnt want a T56 for a stock power car. They gave the GT's a low 1st gear for a reason...to get you out of the hole quicker. If you have the longer 1st gear ratio, you take that away and lengthen your 60ft time, and if that goes down, chances are that you will lose time at the end as well. Plus its heavier. Now road racing, the gear ratios might benefit. But not for straight line racing unless you have the power that you need the taller 1st gear and closer ratios.
Exactly why I said the t-56 needs 4.10's. Unless you're going to mpg. My 69 is 400+ hp and will be more. Odds are that's getting 4.10's as well. But yes that's viper spec ratios, same as the camaro and firebird.
69MustangCoupe393cid is offline   Reply With Quote
Old 04-17-2012, 05:49 PM   #14
LilRoush
6th Gear Member
 
LilRoush's Avatar
 
Join Date: Feb 2007
Vehicle: Roush
Location: South FL
Posts: 8,528
Send a message via AIM to LilRoush
Default

Quote:
Originally Posted by 69MustangCoupe393cid View Post
Not for mine. lol
True. It's all in setting it up to keep you in the power band. PD blower on top has my power down low in the RPM range. And I put over 100 miles a day on it going to/from work - so it does highway time without sucking down fuel.
__________________
~Matt
1998 Roush: M112'd Aluminum block 4.6L 2V 6 speed track car
1999 SVT: Mostly stockish
1970 Mach 1: Resto-modded monster

2000 Roush #5004 - World's FIRST M112'd V6 Mustang. Sold, but not forgotten.
LilRoush is offline   Reply With Quote
Old 04-17-2012, 05:49 PM
MustangForums
Ford Mustang




Paid Advertisement

 
 
 
Reply

Tags
14, 1998, 26, 355s, 99, clutch, cobra, gear, kit, mile, modular, monster, mustang, ratios, spline, t45, t56, time, virginia

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Advertising

Featured Sponsors
Vendor Directory
New Sponsors
All times are GMT -5. The time now is 12:45 PM.

© Internet Brands, Inc.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford® is a registered trademark of the Ford Motor Company
Emails Backup