LMM tranny limits

DieselWrencher

DieselWrencher

6cyl Vette
Joined
Dec 4, 2006
Messages
2,886
How much power can these new transmissions hold? I hear up to 600hp. Is there any truth to that, or is that just bs? I have a friend wanting to mod the engine and just try to do minor mods to the trans. Anyone have any tips and advice so I can try to help him not destroy his new truck? Thanks Ryan.
 
I know of a guy that wasted his at the stock power level. Too many burnouts, dounuts & boosted launches. If you're easy on 'em I heard 400.
 
JQmile said:
I know of a guy that wasted his at the stock power level. Too many burnouts, dounuts & boosted launches. If you're easy on 'em I heard 400.
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Sounds like he wasted the C1 clutches, the tranny can't protect it self(limp mode) at the 1-3 gears like it does in 4-5.

Min. tranny mods should be Transgo & TC, then just make sure it stays cool probably need a cooler in the summer.
 
I just dyno'ed 455 HP yesterday on stock tranny. It's holding up for now.
 
I got a buddy that has a PPE race and exhaust and his is unhappy to say the least. Oh, I guess he does have an Airdog 150 too.
 
i dynoed 505 on a stock trans. depends on how you drive it, i went 6 months then did a full tranny build, none of the clutches were burnt but the tc was shot.... i would say with a trans go jr. your good for 400 hp, any huge hp gain should consider a trans build.....
 
they dyno around 290-310 i went 483 on stock trans went in limp mode a few times no i have a transgo and hadent had a problem
 
Do transmissions and tc's that can handle 750 hp drive like stock or are there drawbacks to driveability.
 
Ridgerunner said:
Do transmissions and tc's that can handle 750 hp drive like stock or are there drawbacks to driveability.
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It all depends on who does the build. At that HP level there will be plenty of trade offs. After the trans/converter build you will find the next weakest link.
 
I drove a friends 2003 Duramax/Allison and he claimed it has around 750 hp and 1100+ ftlb. I have to agree that it had way more power than the rear tires could handle, but the transmission seemed to hunt and was very clunky. It resembled driving a cammed up muscle car from the late 60's. Lots of fun, but not much of a daily driver. Definitely not a tow vehicle. He bought his transmission from suncoast but I do not know any of the details.
 
DieselWrencher said:
How much power can these new transmissions hold? I hear up to 600hp. Is there any truth to that, or is that just bs? I have a friend wanting to mod the engine and just try to do minor mods to the trans. Anyone have any tips and advice so I can try to help him not destroy his new truck? Thanks Ryan.
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I put a tune in my dad's stock LMM and it was running mid 13s at around 97 MPH in a 7900 lb dually. According to the HP calculator on here that puts it at around 480 to 500 HP at the wheels. The shifts seemed to be fine, but I could feel the converter clutch starting to chatter at the top of 5th gear as I was going through the traps. It definitely didn't seem too happy with the power.
Ridgerunner said:
I drove a friends 2003 Duramax/Allison and he claimed it has around 750 hp and 1100+ ftlb. I have to agree that it had way more power than the rear tires could handle, but the transmission seemed to hunt and was very clunky. It resembled driving a cammed up muscle car from the late 60's. Lots of fun, but not much of a daily driver. Definitely not a tow vehicle. He bought his transmission from suncoast but I do not know any of the details.
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A lot of times shifting/driving issues are more tuning related than trans/hard parts related. The right tuning can make all the difference in the world.
 
mine dynoed 479 hp and 830 lb ft to the wheels...and i drive the sh*t out of it everyday...been doin it for around 8 months with no problems


07.5 LMM 7" lift ,37x13.50x20 mud grapplers ,20x10 rockstars,turbo-back mbrp,intake,PPE hot+2 ,ported fuel rail fitting
 
its not really the horsepower that kills the trans... its the torque

i dynoed mine about a month ago at 475/1038 and u can tell the tranny is on its way.. only limped it once

do a suncoast IV kit w/ 1056 and they are damn near bulletproof
 
JAGlmm said:
its not really the horsepower that kills the trans... its the torque

i dynoed mine about a month ago at 475/1038 and u can tell the tranny is on its way.. only limped it once

do a suncoast IV kit w/ 1056 and they are damn near bulletproof
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X2, just do a stage IV suncoast and you will be golden. If your only doing small mods and not racing, pulling, etc. then do a transgo jr.
 
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