Just got word back on my blown "built" Trans...
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Just got word back on my blown "built" Trans...
If you hadn't heard, I blew my 3 day old "built" 4L65 trans.
Just got word back today that it was the stock GM 5-gear planetary (1st gear sprague) that blew up. Evidently, power braking at 4psi of boost is "way too much power for that part". So the Tune will have to be set with basically no timing when brake-stalling. This will of course decrease my power off launch, but Mike (the Tuner at Xtreme) said a 2-step is set up similar. Evidently once I hit 1mph all the timing will be put back in. Sounds a bit goofy to me but if it works and doesn't smoke the trans, great.
It just bugs me that there is NO trans built to launch with gobs of power that will work in my truck. You spend all that money for a beefed up trans then have to adjust the tune to make less power.
Just got word back today that it was the stock GM 5-gear planetary (1st gear sprague) that blew up. Evidently, power braking at 4psi of boost is "way too much power for that part". So the Tune will have to be set with basically no timing when brake-stalling. This will of course decrease my power off launch, but Mike (the Tuner at Xtreme) said a 2-step is set up similar. Evidently once I hit 1mph all the timing will be put back in. Sounds a bit goofy to me but if it works and doesn't smoke the trans, great.
It just bugs me that there is NO trans built to launch with gobs of power that will work in my truck. You spend all that money for a beefed up trans then have to adjust the tune to make less power.
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Originally Posted by Wilde Racing
that doesn't sound right, how much hp should the build trans support?
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Originally Posted by Weedo
If you hadn't heard, I blew my 3 day old "built" 4L65 trans.
Just got word back today that it was the stock GM 5-gear planetary (1st gear sprague) that blew up. Evidently, power braking at 4psi of boost is "way too much power for that part". So the Tune will have to be set with basically no timing when brake-stalling. This will of course decrease my power off launch, but Mike (the Tuner at Xtreme) said a 2-step is set up similar. Evidently once I hit 1mph all the timing will be put back in. Sounds a bit goofy to me but if it works and doesn't smoke the trans, great.
It just bugs me that there is NO trans built to launch with gobs of power that will work in my truck. You spend all that money for a beefed up trans then have to adjust the tune to make less power.
Just got word back today that it was the stock GM 5-gear planetary (1st gear sprague) that blew up. Evidently, power braking at 4psi of boost is "way too much power for that part". So the Tune will have to be set with basically no timing when brake-stalling. This will of course decrease my power off launch, but Mike (the Tuner at Xtreme) said a 2-step is set up similar. Evidently once I hit 1mph all the timing will be put back in. Sounds a bit goofy to me but if it works and doesn't smoke the trans, great.
It just bugs me that there is NO trans built to launch with gobs of power that will work in my truck. You spend all that money for a beefed up trans then have to adjust the tune to make less power.
What kind of 60' times does your truck pull?
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Maybe it was a bad part,chances are the shop wouldnt admit a they did something wrong,time will tell on this next time on how good a job they did.Look how many 12 second SS trucks there are with a shift kit and servos, they are holding up really well.My buddys yukon denali that we H&C headers stall,he's running close to the times you do and his trans has been holding.
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#9
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i've broken one of them before. there is a huge difference in the quality of the bunch though. there are cast steel versions, cast iron, and billet steel. i'd be guessing that your 5 pinioin planetary that broke was an aftermarket replacement for the gm part. there is no reason you can't launch it under the power levels you've put it to so far. look at the 60' time big tex pulled with his 65E. that's alot of stress and a damn heavy truck. i'd be asking to see the part. the 5 pinion in the picture is a factory gm 65E that went in place of the cast 4 pinion i pulled out. the 5 pinion was a much harder machined steel.
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Originally Posted by zippy
i've broken one of them before. there is a huge difference in the quality of the bunch though. there are cast steel versions, cast iron, and billet steel. i'd be guessing that your 5 pinioin planetary that broke was an aftermarket replacement for the gm part. there is no reason you can't launch it under the power levels you've put it to so far. look at the 60' time big tex pulled with his 65E. that's alot of stress and a damn heavy truck. i'd be asking to see the part. the 5 pinion in the picture is a factory gm 65E that went in place of the cast 4 pinion i pulled out. the 5 pinion was a much harder machined steel.