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Old 05-28-2013, 02:06 PM   #1
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Transmission(5-speed to 6-speed)

I lost second gear in my 2001 Mustang GT today. The door sticker is not on the car anymore, so I don't know how to identify what transmission I have. Anyone know how else I can tell? It is a 5-speed manual though.
What all would it take to upgrade to a t-56 6-speed transmission? I'm assuming I'll need a new driveshaft, and clutch. Trying to get a rough estimate on:
what it would cost to do this(6-speed conversion) versus
what it would cost to fix it the cheapest way possible???
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Old 05-28-2013, 06:51 PM   #2
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Look at the Vehicle Certification plate on the drivers door jam:



If the TR code is a 6 it's a T-45, if it is a K then it is a 3650.

A T-56 conversion will cost $2000 to $3500 depending on how much you have to pay for the transmission, bellhousing, etc.--unless you get very lucky and find one from a wreck cheap.

You can get a rebuilt 3650 from here for $800.
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Old 05-28-2013, 06:52 PM   #3
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Quote:
Originally Posted by cliffyk View Post
Look at the Vehicle Certification plate on the drivers door jam:

If the TR code is a 6 it's a T-45, if it is a K then it is a 3650.

A T-56 conversion will cost $2000 to $5000 depending on how much you have to pay for the transmission, bellhousing, etc.; you can get a rebuilt 3650 from here for $800.
He said the door sticker isn't on the side anymore.. You can run the vin..
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Old 05-28-2013, 07:03 PM   #4
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Whoops, missed that...

Just look at it then, the T-45 looks like this:



The 3650 like this:

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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-28-2013, 07:26 PM   #5
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I am also interested in doing this. Subscribed
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Old 05-28-2013, 07:49 PM   #6
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If you tranny is out you can measure the clutch if it is a 11" it's the 3650 and if it's a 10.5 inch it's a t-45
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Old 05-28-2013, 07:59 PM   #7
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Quote:
Originally Posted by cliffyk View Post
Whoops, missed that...

Just look at it then, the T-45 looks like this:

The 3650 like this:
Don't mean to high jack but which is better i just found out I had the t-45
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Old 05-28-2013, 08:02 PM   #8
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Quote:
Originally Posted by sixpac View Post

Don't mean to high jack but which is better i just found out I had the t-45
The 3650 is supposed to be stronger the weak link is the input shaft and it's rated at 360lbs of tourque
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Old 05-28-2013, 08:31 PM   #9
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It is the low (3.38:1) first gear that creates the input shaft "weak point" for the 3650, not that it qualifies as a "weak" transmission in any respect. It uses the same 85 mm shaft centerline as the T-56, and with a higher 1st gear (say 2.97:1) would likely be rated at 450 lb-ft or better. The 360 lb-ft is also a very conservative rating, there are many running 500 and even 600 lb-ft into the 3650.

As an example of how the 1st gear ratio affects torque ratings, consider that the TKO-500 and -600 are the same transmissions; however the 500 has a 3.27:1 1st gear vs. the 600's 2.87 gear. The lower 3.27:1 gear creates higher side forces when loaded, which derates the tranny's maximum input specification, as compared to the 600 with the 2.87:1 1st gear.

Here are the transmissions used over the years in the 4.6L Mustangs:

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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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Old 05-28-2013, 08:36 PM   #10
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Quote:
Originally Posted by cliffyk View Post
It is the low (3.38:1) first gear that creates the input shaft "weak point" for the 3650, not that it qualifies as a "weak" transmission in any respect. It uses the same 85 mm shaft centerline as the T-56, and with a higher 1st gear (say 2.97:1) would likely be rated at 450 lb-ft or better. The 360 lb-ft is also a very conservative rating, there are many running 500 and even 600 lb-ft into the 3650.

As an example of how the 1st gear ratio affects torque ratings, consider that the TKO-500 and -600 are the same transmissions; however the 500 has a 3.27:1 1st gear vs. the 600's 2.87 gear. The lower 3.27:1 gear creates higher side forces when loaded, which derates the tranny's maximum input specification, as compared to the 600 with the 2.87:1 1st gear.

Here are the transmissions used over the years in the 4.6L Mustangs:
Thank you I actually learned a lot
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Old 05-28-2013, 08:54 PM   #11
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T45 and 3650 can both hold a pretty good amount of power, these are not the glass jaw T-5s.

T45 is getting hard to get parts for but you can still get them done by t45source and hanlon. Hanlon does the 3650 too. Honestly both gearsets are very stout. New forks and a 26 spline input shaft on either trans will make them pretty rock solid through 600whp. Although somewhere the t45 designer is rolling over in his grave with the 3 rail shifter setups on the 3650 vs the single rail on the t45.
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Old 05-29-2013, 05:59 PM   #12
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I got under the car and checked the tag...I have a 3650
It'll go into second when I'm not moving but not when I am moving. Dies this mean its a synchro problem?
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Old 05-29-2013, 06:58 PM   #13
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That probably is a syncrho issue. Just make sure your clutch is engaging all the way before you tear the trans out. At any rate a new used 3650 is going to run around $400 in good shape and if you have a buddy who has done it before and a lift a trans swap takes around 3 hours. Maybe a little longer if your exhaust has never been off.
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