LSD for F23 trans- worth it ? (Page 1/1) cam-a-lot SEP 22, 08:37 AM Hello I was out having fun with my Fiero, and snapped a driver's side axle unfortunately. Hoping to "tap" out the broken part from the other side, as it snapped right at the end of the spline I don't know much about how transmissions actualy work, but my understanding is that without an LSD, most or all of the power is actually going to one axle. If this is correct, would it make sense for me to add an LSD to my transmission so that the torque is split more evenly, thus making it less likely that I will break an axle in the future? I don't have any problems with traction, and don't really do any autocross/ racing type driving. Just trying to avoid this issue from happening again Thoughts? fieroguru SEP 22, 09:03 AM In an open differential, the power flows to the tire with the least amount of traction. In a limited slip, more power flows to the tire with the most traction, so a limited slip won't help with the axle breakage issue. I assume it broke in 1st gear. Take the 1st gear ratio x final drive ratio x RWTQ (or engine torque x 0.9). It will likely be 3.58 x 3.63 (assuming rear cobalt final drive = best case) x 300 lb-ft = 3,898 lb-ft split between the two axles... assuming you can get traction. Axles and engine/transmission mounts have a hard life! 1985 Fiero GT SEP 22, 09:06 AM quote Originally posted by cam-a-lot: Hello I was out having fun with my Fiero, and snapped a driver's side axle unfortunately. Hoping to "tap" out the broken part from the other side, as it snapped right at the end of the spline I don't know much about how transmissions actualy work, but my understanding is that without an LSD, most or all of the power is actually going to one axle. If this is correct, would it make sense for me to add an LSD to my transmission so that the torque is split more evenly, thus making it less likely that I will break an axle in the future? I don't have any problems with traction, and don't really do any autocross/ racing type driving. Just trying to avoid this issue from happening again Thoughts? The exact opposite, without LSD, generally speaking, torque is always applied evenly between the axles (but not wheel speed), when one wheel loses traction and can only put a tiny force on the ground, it spins, and that tiny force will also be applied to the other side with traction(applies equal torque to both wheels, if one is spinning and only putting a little bit of torque to the ground, that exact amount is also being applied to the other wheel) with LSD, they are "locked" together, so if one tire is low traction, most torque goes to the other tire, snapping that axle, equal wheel speed, unequal torque applications (but more torque to the ground). fieroguru SEP 22, 09:07 AM The other concern with a street car and Limited slip is that when the tires spin, both will spin and if the road isn't level or you are going around a turn, the Fiero will swap ends in an instant. Less of an issue for a track car on a dry track, but rain/snow on city streets with some oil shean makes for some excitement. cam-a-lot SEP 22, 09:19 AM Ok, great advice, thanks. Will look into getting someone to make me some stronger axles then. Much appreciated