New GM 4L75E Transmission
11-01-2016, 10:07 PM
#11
When I read the hotrod article it seemed like it had all the buzzword parts of a good 60e build. With it not being a new production transmission I doubt much r&d went into it.They are probably just trying to fill a niche market with their "new" built 60e for all the ls swaps going into older vehicles. I guess we'll have to wait for more info on it.
11-01-2016, 10:22 PM
#12
My point is are they using a sonnax input drum or a new designed gm unit, i mean hell if all it takes to build one is 5 pinion planetaries a vette servo and a sonnax drum...then hell half of us already have one! I am curious as to whether or not it has the input shaft sensor on the back of the pump, or if it is an older pump....
11-03-2016, 07:47 AM
#17
Not 100% positive but he asked what my HP goals were, I said my combo would probably make 700 on kill but realistically mid 6s is a good goal for me. He laughed and said no prob, hes got dozens of guys with tbss and full size trucks with 200-300 more hp than I was hoping for. Ive talked to them, some are turbo 4.8/5.3/6.0, some are 400+" strokers with huge kits on them. Either way, they weigh the same, have way more torque and HP and most of them have slicks or radials that would bite a lot more than my all terrains. Transbuilder guy even said his level 4 or 4.5 unit would be fine for my goals but i didnt wanna chance it and went all out with his level 5 plus every option he offered.
11-15-2016, 08:44 PM
#18
I'm definitely interested to hear what differences that 75e has over a well built 60e from any of the known builders. The GM crate motor/ trans segment is huge business, so their transmission marketing must evolve with the motors so GM can keep building "connect and cruise" packages for hot rods. Sounds vaguely like a marketing gimmick but their durability testing sounds pretty gnarly:
"The car weighed about 3900 lbs with driver during the drag strip portion of the test. We had previously run the same car with this same exact engine and transmission at the Milford Proving Ground at a weight of 4200 lbs on a very brutal clutch energy test cycle. That cycle consisted of a wide open throttle run from a dead stop up through all gears to 4th gear, then braking to 30 mph, going wide open throttle again forcing a 4-2 downshift running into 3rd gear, let off throttle and after it shifts to 4th, manually shifting the trans down to 3rd (at about 70 mph), allow the engine to brake the car down to 40 mph, then manually downshifting to 2nd gear. Slow to a stop. That is one cycle. We would then do it again and again for over 2,000 cycles. This was done using the same engine and transmission for all testing. The same transmission fluid was used from the start of testing until the transmission was removed for teardown analysis."
"The car weighed about 3900 lbs with driver during the drag strip portion of the test. We had previously run the same car with this same exact engine and transmission at the Milford Proving Ground at a weight of 4200 lbs on a very brutal clutch energy test cycle. That cycle consisted of a wide open throttle run from a dead stop up through all gears to 4th gear, then braking to 30 mph, going wide open throttle again forcing a 4-2 downshift running into 3rd gear, let off throttle and after it shifts to 4th, manually shifting the trans down to 3rd (at about 70 mph), allow the engine to brake the car down to 40 mph, then manually downshifting to 2nd gear. Slow to a stop. That is one cycle. We would then do it again and again for over 2,000 cycles. This was done using the same engine and transmission for all testing. The same transmission fluid was used from the start of testing until the transmission was removed for teardown analysis."
