T-5 LO3 behind a 350?
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Joined: Apr 2002
Posts: 675
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From: Charleston, SC
Car: 1988 Pontiac Firebird, flat black
Engine: Stock 305 LO3
Transmission: Five speed
T-5 LO3 behind a 350?
Could a stock LO3 T5 hold the power increase? What is the max HP and TQ it is good for? I want to do a motor upgrade once I have the money and I would love to keep my tranny. Do I have to have it rebuilt it and make it stronger? The motor I plan on putting in may end up with about 350-400HP and wind up to around 6000 RPM.
Joined: Jul 1999
Posts: 10,950
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From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
Mine lasted until I started running 12's on ET Streets, then it broke 3rd gear. If you want to make that much power, plan on upgrading to a T56.
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Joined: Jun 2002
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From: Killa Cali
Synthetic oil and don't power shift and traction, shockloading it all that kills T5. Just be nice and only dog her when you need to. Get a new clutch so you have to baby her for 500 - 100 miles and you may learn to save it.
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Joined: Mar 2000
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From: Warsaw, Indiana
Car: 1991 Firebird
Engine: 427 LSX
Transmission: Turbo 400
It'll break, not right away, but be certain, it will. I broke 3rd gear. It actually broke under NA power but I am sure I kinda hurt it going 115 in the 1/4. Good luck
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