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ORIGINAL: Dave2000GT
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ORIGINAL: 2000GT4.6
T-45 transmissions:
Do NOT powershift a T-45. I would also not recommend speed shifting a T-45 into 3rd gear. I have been thru 2 T-45, with the second one only lasting about a year.
These transmissions have a weak syncroniser, espcially in 3rd. My 2nd one was doomed after one speed shift into 4th that didn't quite make it. It was only a matter of time till I lost both 3rd and 4th.
I guess what I am saying is take it easy on T-45 equipped cars (I believe they are in the 01 and down??)
Also, if you do ruin your T-45, and plan on getting LT headers, just get a more reilable trans like a 3650 or a TKO. You must remove the headers to remove the trans, so you only want to do it once if at all. I learned the hard way!!!!
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Crap... really ?? I've 1-2 powershifted my T45 at least 50 times in the past month. It's still OK.. same as when I bought it.. SLIGHT grind when slow shifting to 2nd.. but I got a warranty with it so I'm not trying to be too careful with it.
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This "slight grind" is the start of a problem that is going to result in the transmission ruining the sync, and then finnally shearing out the entire gear. This is exactly what happened both times to me.
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Maybe if your powershifting with the mods you have below. Normal-Bolt on cars shouldnt have problems powershifting a t-45. They dont seem to have problems until you get in the 350+ Flywheel HP range.
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I ruined trans 1 with only 3.73s, mufflers, and a K&N. Believe me, if you powershift a T-45, espcially into 3rd gear (by powershifting I mean not lifting off the gas while shifting) you WILL eventually ruin the trans, and you would be suprised how little time it takes. 3rd seems to be espcially weak.
The second trans acutally lost the sync in 4th, but a healthy shift into 4th one day (it would still go in, it would just grind a bit) resulted in a loss of both 3rd and 4th gear. This is why I ended up spending this summers supercharger money on a trans/clutch and assorted gear to make it work.