ls1plus Posted August 8, 2010 Report Share Posted August 8, 2010 anyone offer an upgrade for the input shaft of a ls1 t56? i have only found them for ford Quote Link to comment Share on other sites More sharing options...
blue99fbody Posted August 9, 2010 Report Share Posted August 9, 2010 input shaft doesnt need upgraded on fbody t56, ive been told its plenty strong, its the output side (mainshaft) they upgrade to a 30 spline viper one from the 27 spline stock one. did you break the input side? Quote Link to comment Share on other sites More sharing options...
ls1plus Posted August 9, 2010 Author Report Share Posted August 9, 2010 no, i broke everything else... the guy thats helping me go through mine said in his opinion the input shaft is the main thing holding back the torque capacity.i have to replace it anyways since 4th gear is bad but couldnt find the upgrade anywhere Quote Link to comment Share on other sites More sharing options...
twistedfocus1647545489 Posted August 9, 2010 Report Share Posted August 9, 2010 Needs more Ford Quote Link to comment Share on other sites More sharing options...
ls1plus Posted August 9, 2010 Author Report Share Posted August 9, 2010 Needs more Ford That may be. Then it would have more stuff to match the 9" that i haven't broken... yet Quote Link to comment Share on other sites More sharing options...
DKilbourne Posted August 10, 2010 Report Share Posted August 10, 2010 anyone offer an upgrade for the input shaft of a ls1 t56? i have only found them for ford The T-56 that Ford used in the 03/04 Cobra had a 10-spline input shaft and the 26-spline input shaft is an upgrade for that. The GM T-56 has a 26-spline shaft already, so as far as spline count it doesn't need an upgrade. I don't know if they make a better shaft for the GM trannies or not. Quote Link to comment Share on other sites More sharing options...
blue99fbody Posted August 10, 2010 Report Share Posted August 10, 2010 no, i broke everything else... the guy thats helping me go through mine said in his opinion the input shaft is the main thing holding back the torque capacity.i have to replace it anyways since 4th gear is bad but couldnt find the upgrade anywhere id reconsider who you have do your trans then, bc the input shaft is not the week point that holds back the tq capacity. its the output shaft, which you can upgrade to the 30 spline viper one. how much tq are you making anyway that your worried about it. im making 743rwtq on a stock input and output shaft with no issues so far Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted August 10, 2010 Report Share Posted August 10, 2010 Just buy a magnum and be done with it. Quote Link to comment Share on other sites More sharing options...
1slow-z Posted August 10, 2010 Report Share Posted August 10, 2010 Last year I bent the input on mine and I couldn't find anything other than a stock one. Quote Link to comment Share on other sites More sharing options...
ls1plus Posted August 11, 2010 Author Report Share Posted August 11, 2010 The T-56 that Ford used in the 03/04 Cobra had a 10-spline input shaft and the 26-spline input shaft is an upgrade for that. The GM T-56 has a 26-spline shaft already, so as far as spline count it doesn't need an upgrade. I don't know if they make a better shaft for the GM trannies or not. the concern was where it was necked down after the spline, i bought a factory replacement after talking to everyone Quote Link to comment Share on other sites More sharing options...
ls1plus Posted August 11, 2010 Author Report Share Posted August 11, 2010 Last year I bent the input on mine and I couldn't find anything other than a stock one. the only thing i have been told is to buy a viper input shaft and have it machined down to the correct length Quote Link to comment Share on other sites More sharing options...
ls1plus Posted August 11, 2010 Author Report Share Posted August 11, 2010 id reconsider who you have do your trans then, bc the input shaft is not the week point that holds back the tq capacity. its the output shaft, which you can upgrade to the 30 spline viper one. how much tq are you making anyway that your worried about it. im making 743rwtq on a stock input and output shaft with no issues so far he mentioned it once that i should consider upgrading it, i dont think thats reason for finding someone else. thanks for clarifying the weak point though. im hearing now from everyone that the input is good for ~ 1000 ft lbs, im not near that level Quote Link to comment Share on other sites More sharing options...
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