4t65e transmissions
10-30-2008, 04:14 PM
#26
actualy, it is very much still 4t65e. the planetaries are stock units from a gxp grand prix (5.3l), the case, valve body, diff cover, ect. yes there are a lot of aftermarket parts in it. a powerglide you find in a race car is less like the original than a 4t65e race tranny is to the oem unit.
10-30-2008, 06:12 PM
#27
actualy, it is very much still 4t65e. the planetaries are stock units from a gxp grand prix (5.3l), the case, valve body, diff cover, ect. yes there are a lot of aftermarket parts in it. a powerglide you find in a race car is less like the original than a 4t65e race tranny is to the oem unit.
10-30-2008, 07:48 PM
#28
Exactly, the planetary gear, the 2nd gear clutch/plates and I think two of the sprag clutches are the only stock parts, everything else is either removed, rendered inoperative, replaced with race only stuff or modified to the point where it no longer interchanges with stock.
Lets not forget you cant really just go ahead and build one of these on your own, GMR hasnt even released the full build procedure and specs to my knowledge. You need to deal with Hydramatic and GMR to get your hands on one.
Lets not forget you cant really just go ahead and build one of these on your own, GMR hasnt even released the full build procedure and specs to my knowledge. You need to deal with Hydramatic and GMR to get your hands on one.
11-04-2008, 06:04 PM
#29
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Last time we went to the track together he was spinning his way to 12.7's and couldnt catch traction on only 9 psi.
11-05-2008, 02:51 AM
#30
^^ while at the end of the day, the 4t65 will take more power than the 4t45, its still probably cheaper to build your 4t45 to take 600hp than it is to swap to a 4t65. if you plan on more than 700hp or so, then i guess you might wanna look into a tranny swap
11-05-2008, 11:11 AM
#31
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me and my friend who is helping me do my turbo build, talked to the GM certification class teacher/ professor and he said the 4t45e will be able to take whatever punishment I dish out at it.
11-05-2008, 02:50 PM
#32
well...i say this. 4t45 rated at 325 ft lbs is a pretty nice rating. Also when you consider the F35 is rated at what it is when theres still several DD 400+ WHP cobalts using stock tranny/clutch. This means GM probably left a lot of cushioning between the rated power level and the power level point of failure. Hwever...i personally dont like to use the though process of "they probably left a safety margin" with my only car...
11-24-2011, 11:46 PM
#34
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I was just looking into this because of fuel mileage and a shorter first and 2nd gear would be nice for take offs.... im looking to push 200-205 at the crank (170 180 whp) with my boltons and future tune so no need for my trans to be good for 500 hp just looking for better fuel economy.... but sounds like it would be waaayyy more involved and un cost effective than what would be worth it.... btw im getting like 24.2 combined mileage which seems pretty shitty imo.... anybody else getting similar fuel mileage or could there be something wrong.... i dont have that heavy of a foot.... and cruise 75-80 on freeway
06-19-2012, 05:12 AM
#35
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Holy thread revival batman!
Just thought i would see if there is anything more that anyone has done with the 4t65 in the cobalt...
The 4t45e will not hold CLOSE to 400WTQ... Just thought I would update that at least.
Just thought i would see if there is anything more that anyone has done with the 4t65 in the cobalt...
The 4t45e will not hold CLOSE to 400WTQ... Just thought I would update that at least.
06-20-2012, 06:20 PM
#46
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Clutch plates keep getting welded together leaving me with only 3rd 4th and lock up. Always the 2 to 3 shift that it happens on... IPT told me that it would support up to 500WTQ and they said that I must be way over 500WTQ if I'm breaking them in one run.
I sent my trans for them to build and they did just that... Now they won't warranty it, bunch of ******** over at IPT.
4T40E | 4T45E | Performance Transmission
I've also got a trans cooler on it too.
Trans tune is good, all done by SCcobaltSS.
I sent my trans for them to build and they did just that... Now they won't warranty it, bunch of ******** over at IPT.
4T40E | 4T45E | Performance Transmission
I've also got a trans cooler on it too.
Trans tune is good, all done by SCcobaltSS.
06-20-2012, 06:39 PM
#48
Senior Member
I used dex 6 in my first 3 trans (not built by IPT) Then in my 4th one I had synthetic Mobil one.
IPT wouldn't recommend me anything as far as tuning it... I believe the quote Tyler from IPT said was 'tuning it is fine, it will take whatever you can throw at it because we've never had one of these come back before." Fluid level was good on them, pretty easy to check.
I'd have to get the tune in order to see what exactly line pressure and shift times are...
IPT wouldn't recommend me anything as far as tuning it... I believe the quote Tyler from IPT said was 'tuning it is fine, it will take whatever you can throw at it because we've never had one of these come back before." Fluid level was good on them, pretty easy to check.
I'd have to get the tune in order to see what exactly line pressure and shift times are...