Do we trust Summit's advice?
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Joined: Aug 2005
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Do we trust Summit's advice?
Today I called Summit Racing to further explore specific rack and pinion options. I mentioned to the fella that I had plans to create a 302 good for about 320-350HP and want to stick a T-5z behind it with 4.10 gears in the rearend. He interrupted and broke into a long sermon about how the super-duty T-5 was going to be chewed up and spit out by even 320HP. (T-5's make good boat anchors, he said...) I clarified to him that this was not going to be a race application, but he insisted that what I really need is a Tremec good for about 600 ft lbs. I'm going to have to collect everything between the engine and differential anyway. I have read volumes of posts praising the t-5 and have heard little about tremec's on this site. A little experience and wisdom is called for... was I being sold something I'll never need, or is he enlightening me? Thanks ahead of time.
5th Gear Member
Joined: Feb 2005
Posts: 2,707
From: San Francisco
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Joined: Oct 2004
Posts: 17,565
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RE: Do we trust Summit's advice?
The T-5 is made for street use. The 4650 is a little more durable, but not by much. If you are into racing, then consider other trannies for racing purposes. He is not leading you wrong if you are talking about racing applications.
4th Gear Member
Joined: Mar 2006
Posts: 1,261
From: Concord, NC
RE: Do we trust Summit's advice?
these are the spes form ford racing catalog,
UPGRADED SUPER-DUTY
T-5 TRANSMISSION
M-7003-Z* 1979-93 V-8 only
• Heavy-duty “World Class†T-5 5-speed manual
transmission with short-throw shifter
• Gear ratios: 1st 2.95; 2nd 1.94; 3rd 1.34;
4th 1.00; 5th 0.63
• 330 ft./lbs. torque capacity
• Shaft length: 7.18"
• Input pilot diameter: 0.668"
• Double-moly 2nd speed, 3rd speed and
countershaft cluster gears
• Carbon-fiber 3-4 blocker rings
• Improved synchronizers and bearings
• 1.0625" diameter 10-tooth input spline
• 28-tooth output spline
• 7-tooth speedometer drive gear
• Cobra-style pocket bearing
• Steel input bearing retainer
TREMEC 5-SPEED
EXTRA HD TRANSMISSION
M-7003-R58C* (Close Ratio)
• 600 ft./lbs. torque capacity
• Gear ratios: 1st 2.87; 2nd 1.90; 3rd 1.34; 4th 1.00;
5th 0.82
• Features improved shift forks, one-piece counter
shaft, gears made of 4615 steel which increases
the torque capacity over that of the M-7003-R58
model
• Input shaft is 26 spline and output shaft is 31 spline
• Requires a unique bellhousing M-6392-R58
to install in a 1979-95 Mustang
• To fit in a 1979-93 Mustang use M-5059-A
crossmember
• To fit in a 1994-95 Mustang, modify vehicle
crossmember, lengthen driveshaft .625"
and use clutch fork E6ZZ-7515-A
• 31 spline driveshaft yoke required
• Unique clutch disc designed for 26 spline input
must be used
• Can be used in 4.6L applications with bellhousing
M-6392-M46
UPGRADED SUPER-DUTY
T-5 TRANSMISSION
M-7003-Z* 1979-93 V-8 only
• Heavy-duty “World Class†T-5 5-speed manual
transmission with short-throw shifter
• Gear ratios: 1st 2.95; 2nd 1.94; 3rd 1.34;
4th 1.00; 5th 0.63
• 330 ft./lbs. torque capacity
• Shaft length: 7.18"
• Input pilot diameter: 0.668"
• Double-moly 2nd speed, 3rd speed and
countershaft cluster gears
• Carbon-fiber 3-4 blocker rings
• Improved synchronizers and bearings
• 1.0625" diameter 10-tooth input spline
• 28-tooth output spline
• 7-tooth speedometer drive gear
• Cobra-style pocket bearing
• Steel input bearing retainer
TREMEC 5-SPEED
EXTRA HD TRANSMISSION
M-7003-R58C* (Close Ratio)
• 600 ft./lbs. torque capacity
• Gear ratios: 1st 2.87; 2nd 1.90; 3rd 1.34; 4th 1.00;
5th 0.82
• Features improved shift forks, one-piece counter
shaft, gears made of 4615 steel which increases
the torque capacity over that of the M-7003-R58
model
• Input shaft is 26 spline and output shaft is 31 spline
• Requires a unique bellhousing M-6392-R58
to install in a 1979-95 Mustang
• To fit in a 1979-93 Mustang use M-5059-A
crossmember
• To fit in a 1994-95 Mustang, modify vehicle
crossmember, lengthen driveshaft .625"
and use clutch fork E6ZZ-7515-A
• 31 spline driveshaft yoke required
• Unique clutch disc designed for 26 spline input
must be used
• Can be used in 4.6L applications with bellhousing
M-6392-M46
I ♥ Acer
Joined: Oct 2004
Posts: 17,565
From:
RE: Do we trust Summit's advice?
ORIGINAL: mustanglover66
these are the spes form ford racing catalog,
UPGRADED SUPER-DUTY
T-5 TRANSMISSION
M-7003-Z* 1979-93 V-8 only
• Heavy-duty “World Class†T-5 5-speed manual
transmission with short-throw shifter
• Gear ratios: 1st 2.95; 2nd 1.94; 3rd 1.34;
4th 1.00; 5th 0.63
• 330 ft./lbs. torque capacity
• Shaft length: 7.18"
• Input pilot diameter: 0.668"
• Double-moly 2nd speed, 3rd speed and
countershaft cluster gears
• Carbon-fiber 3-4 blocker rings
• Improved synchronizers and bearings
• 1.0625" diameter 10-tooth input spline
• 28-tooth output spline
• 7-tooth speedometer drive gear
• Cobra-style pocket bearing
• Steel input bearing retainer
TREMEC 5-SPEED
EXTRA HD TRANSMISSION
M-7003-R58C* (Close Ratio)
• 600 ft./lbs. torque capacity
• Gear ratios: 1st 2.87; 2nd 1.90; 3rd 1.34; 4th 1.00;
5th 0.82
• Features improved shift forks, one-piece counter
shaft, gears made of 4615 steel which increases
the torque capacity over that of the M-7003-R58
model
• Input shaft is 26 spline and output shaft is 31 spline
• Requires a unique bellhousing M-6392-R58
to install in a 1979-95 Mustang
• To fit in a 1979-93 Mustang use M-5059-A
crossmember
• To fit in a 1994-95 Mustang, modify vehicle
crossmember, lengthen driveshaft .625"
and use clutch fork E6ZZ-7515-A
• 31 spline driveshaft yoke required
• Unique clutch disc designed for 26 spline input
must be used
• Can be used in 4.6L applications with bellhousing
M-6392-M46
these are the spes form ford racing catalog,
UPGRADED SUPER-DUTY
T-5 TRANSMISSION
M-7003-Z* 1979-93 V-8 only
• Heavy-duty “World Class†T-5 5-speed manual
transmission with short-throw shifter
• Gear ratios: 1st 2.95; 2nd 1.94; 3rd 1.34;
4th 1.00; 5th 0.63
• 330 ft./lbs. torque capacity
• Shaft length: 7.18"
• Input pilot diameter: 0.668"
• Double-moly 2nd speed, 3rd speed and
countershaft cluster gears
• Carbon-fiber 3-4 blocker rings
• Improved synchronizers and bearings
• 1.0625" diameter 10-tooth input spline
• 28-tooth output spline
• 7-tooth speedometer drive gear
• Cobra-style pocket bearing
• Steel input bearing retainer
TREMEC 5-SPEED
EXTRA HD TRANSMISSION
M-7003-R58C* (Close Ratio)
• 600 ft./lbs. torque capacity
• Gear ratios: 1st 2.87; 2nd 1.90; 3rd 1.34; 4th 1.00;
5th 0.82
• Features improved shift forks, one-piece counter
shaft, gears made of 4615 steel which increases
the torque capacity over that of the M-7003-R58
model
• Input shaft is 26 spline and output shaft is 31 spline
• Requires a unique bellhousing M-6392-R58
to install in a 1979-95 Mustang
• To fit in a 1979-93 Mustang use M-5059-A
crossmember
• To fit in a 1994-95 Mustang, modify vehicle
crossmember, lengthen driveshaft .625"
and use clutch fork E6ZZ-7515-A
• 31 spline driveshaft yoke required
• Unique clutch disc designed for 26 spline input
must be used
• Can be used in 4.6L applications with bellhousing
M-6392-M46
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