TR3650 Transmission Overview
Designed and manufactured by Tremec, the TR-3650 is a 5-speed manual transmission that was first introduced in the SN95 2001 Ford Mustang GT and 2001 Ford Mustang Cobra. They were installed halfway through the 2001 model year, and carried the transmission code K. Earlier models were equipped with the T-45 transmission, and had the transmission code 6. FoMoCo needed a stronger gearbox that could withstand additional torque output, so they turn to Tremec for a design. It would see service in the 2001 – 2004 Mustang GT, Ford Mustang Cobra, Ford Mustang Bullitt, 2003 – 2004 Ford Mustang Mach I, the S197 2005 – 2010 Ford Mustang GT and the S197 2008 – 2009 Ford Mustang Bullitt. The TR 3650 transmission was also used the Australian built Ford Falcon BA.
What Transmission Do I Have?
The Tremec TR3650 transmission featured a more robust 11-inch clutch disc, compared to the 10.5” plate found in the old T45 transmission. There is a difference between the 2001 – 2004 TR3650 transmission and the 2005 – 2010 TR3650 transmission; first-gen versions had a conventional throwout bearing and cable operated clutch fork. The second-gen versions got a hydraulically operated throwout bearing situated along the input shaft. It also got a revised design, where the shifter mounts to the body, instead of the transmission. The tail shaft design also changed from a slip-yoke to a fixed flange.
OE TR-3650 5-speed Manual Transmission Applications
SN95 2001-2004 Ford Mustang GT
SN95 2001 Ford Mustang Cobra
SN95 2001 Ford Mustang Bullitt
SN95 2003-2004 Ford Mustang Mach I
S197 2005-2010 Ford Mustang GT
S197 2008-2009 Ford Mustang Bullitt
Ford Falcon BA.
TR-3650 Technical Specs
Input shaft: 10 spline
Output shaft: 31 spline
Torque capacity: 360 lb-ft
Weight: 119 lbs
Fluid capacity: 7.5 pt | 3.6L
Fluid type: Mercon XT2 QDX
TR3650 Transmission Gear Ratios
1st = 3.38
2nd = 2.00
3rd = 1.32
4th = 1.00
5th = 0.67 (2001) | 0.62 (2002-2004)
R = 3.38
Common TR-3650 Transmission Problems
TSB 08-2-10 – Separator plate buzzing sound
2005 – 2008 Ford Mustang 4.6L
Problem – A buzzing sound may be heard before the vehicle warms up
Solution – Replace separator plate
TSB 04-26-13 – Grinding noise during or difficulty making the 1-2 shift
2004 Ford Mustang 4.6L (this transmission problem can affect other models equipped with the Tremec TR3560)
Problem – A grinding sound may be experienced during the 1-2 shift. It may also be difficult to make this gear change.
Solution – Replace the 1-2 synchronizer assembly, 1-2 shift fork and rail, synchro rings and cones.
What Transmission Do I Have?
TSB 09-9-6 – Clash feeling or difficulty shifting
2007 – 2008 Ford Mustang 4.6L
Problem – Driver may experience difficulty making the 1-2 or 2-3 upshift
Solution – Install new 1-2 synchronizer assembly, 3-4 synchronizer assembly, 1-2 blocking ring, 3, 4, 5 and reverse blocking ring