Originally Posted by 66fstbk88
I got a 351w pushing way to hard for these T5's that I keep chewin' up.
I'm not sure what kind of car you're running, or what gears or tires (tires are like a replaceable fuse!) you have...but I ran a T5z behind a 500hp+ N/A 347, in a 10.70 2850lb daily driver Mustang for two years without issue. The z spec T5's are rated slightly higher than a standard unit, but not enough to make that much of a difference.
I guess what I'm saying is...rather than blame the 351...possibly you might consider how you're driving/shifting it? That's no insult!! An aftermarket shifter with positive stops (Pro 5.0) is an absolute necessity. Upgraded shift forks are also very much recommended. Additionally, no matter how 'hard' you drive it...you always have to keep in mind what you're shifting. Crisp, 'well aimed' shifts that aren't over powered do more for the life of a T5 than any single internal improvement. I mean, if I could run 10.70's with one behind a 347...it's clear they'll take hard shifts and a good bit of abuse =D.
Hope that helps!!