LT1 torque spec differences
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From: Niles, IL
Car: '91 LS6/T56/9"
Engine: LS6
Transmission: T56
Axle/Gears: Currie 9"/4.11, detroit truetrac
LT1 torque spec differences
I remember seeing something about there being torque spec differences between LT1 T56's, and LS1 T56's. Is this true? I searched, but couldn't find.
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: LT1 torque spec differences
On the bolts? Or the warranty ratings?
The '93 M29 T56 were factory rated at 360lb-ft
The '93 M28 T56 were factory rated at 400lb-ft
The '94-'02 MM6 T56 were factory rated at 450lb-ft
The later model years got improvements in parts, but they were mostly reliability/longevity related. Once the common wear/failure parts are replaced in any MM6 unit, the ratings can all go to 700lb-ft. (limit of the mainshaft and gears)
The '93 M29 T56 were factory rated at 360lb-ft
The '93 M28 T56 were factory rated at 400lb-ft
The '94-'02 MM6 T56 were factory rated at 450lb-ft
The later model years got improvements in parts, but they were mostly reliability/longevity related. Once the common wear/failure parts are replaced in any MM6 unit, the ratings can all go to 700lb-ft. (limit of the mainshaft and gears)
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Thread Starter
Senior Member
iTrader: (4)
Joined: Oct 2008
Posts: 857
Likes: 5
From: Niles, IL
Car: '91 LS6/T56/9"
Engine: LS6
Transmission: T56
Axle/Gears: Currie 9"/4.11, detroit truetrac
Re: LT1 torque spec differences
any difference on the pressure plate bolts? I've heard some talk of there being a difference.
Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: LT1 torque spec differences
Yes.. I consider the clutch/FW more engine specific than trans. The stock LS1 is 52#, the stock LT1 is 22#. Aftermarket clutches will have their own specs, so check carefully.
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From: Chester, VA
Car: '88 GTA
Engine: L-98
Transmission: T-56
Re: LT1 torque spec differences
On the bolts? Or the warranty ratings?
The '93 M29 T56 were factory rated at 360lb-ft
The '93 M28 T56 were factory rated at 400lb-ft
The '94-'02 MM6 T56 were factory rated at 450lb-ft
The later model years got improvements in parts, but they were mostly reliability/longevity related. Once the common wear/failure parts are replaced in any MM6 unit, the ratings can all go to 700lb-ft. (limit of the mainshaft and gears)
The '93 M29 T56 were factory rated at 360lb-ft
The '93 M28 T56 were factory rated at 400lb-ft
The '94-'02 MM6 T56 were factory rated at 450lb-ft
The later model years got improvements in parts, but they were mostly reliability/longevity related. Once the common wear/failure parts are replaced in any MM6 unit, the ratings can all go to 700lb-ft. (limit of the mainshaft and gears)
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Joined: Aug 1999
Posts: 858
Likes: 6
From: Elkton MD, USA
Car: 1985 Camaro Z28, VIN F
Engine: 427 sbc, HSR
Transmission: T-56, self rebuilt 700+ hp
Axle/Gears: Moser 12bolt, 3.42 trutrac
Re: LT1 torque spec differences
I probably have the 28,29 mixed up.. But yes, the higher (numerical) 1st gear unit has the lower TQ rating. (More, thus smaller teeth)
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Joined: May 2002
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From: Chester, VA
Car: '88 GTA
Engine: L-98
Transmission: T-56
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