4l60/70 derivative vs 4l80
Thread Starter
Racer
Joined: Mar 2021
Posts: 278
Likes: 43
From: Kansas
4l60/70 derivative vs 4l80
Ok, I have about given up on finding a 4L80 core to rebuild to start moving forward on my LS swap, how well will the 4l60/70 derivative hold up to long term 500-600 hp? Anyone had real luck with these units in a C3 with an LS swap? This is car I plan on driving and don't want to put in a transmission every 30-50k miles.
Le Mans Master
Joined: Jul 2008
Posts: 9,928
Likes: 2,024
From: 200 AGL
St. Jude Donor '15
Massively inferior design with respect to thermal performance. You can upgrade components to handle the torque but it will always be prone to overheating by design. Whether it can me mitigated with a good cooler depends on your use case.
Team Owner
Joined: Apr 1999
Posts: 21,953
Likes: 1,445
From: Reno Nevada
2024 C3 of the Year Finalist- Modified
Have you been online looking for a transmission.
You can have 700r4s built for 850 hp. I had one from art carr. Never had a problem running my 427 with more power than n/a LS7 even with mods.
If I was going to do it over I would be looking at a 8 or 10 speed with some kind of traction control.
Automatic transmissions are TQ multipliers. I had severe wheel hop until I solid mounted my differential , added 500 plus pound rear mono spring, and went to dual adjustable qa1 rear shocks. Then it was just traction problems that even 345 width rear tires couldn't solve.
To make my car work again I went to a manual transmission 5 speed. If you truly have 600 hp you have to go manual unless you have power limiting traction control
You can have 700r4s built for 850 hp. I had one from art carr. Never had a problem running my 427 with more power than n/a LS7 even with mods.
If I was going to do it over I would be looking at a 8 or 10 speed with some kind of traction control.
Automatic transmissions are TQ multipliers. I had severe wheel hop until I solid mounted my differential , added 500 plus pound rear mono spring, and went to dual adjustable qa1 rear shocks. Then it was just traction problems that even 345 width rear tires couldn't solve.
To make my car work again I went to a manual transmission 5 speed. If you truly have 600 hp you have to go manual unless you have power limiting traction control
Drifting
Joined: Aug 2019
Posts: 1,510
Likes: 498
Yes they can, Sonnax Beast Sun Shell, Sonnax Input Shell, Sonnax 6 pinion close ratio low gear set, 300M input shaft and your favorite shift kit will hold more than 550 to 600 , the 70 has a slightly deeper bell housing over a 60 or 65 for stronger multi clutch Lock-up unit inside the Torque Converter
Melting Slicks
Joined: Apr 2021
Posts: 2,723
Likes: 2,168
From: Minnesota
Does the answer change when the question is no more than 500 hp/tq?
The 4L80E has been done and it will fit, but a 4L60/65/70E fits much nicer and allows more clearance for cooling lines.
The 4L80E has been done and it will fit, but a 4L60/65/70E fits much nicer and allows more clearance for cooling lines.
Thread Starter
Racer
Joined: Mar 2021
Posts: 278
Likes: 43
From: Kansas
Have you been online looking for a transmission.
You can have 700r4s built for 850 hp. I had one from art carr. Never had a problem running my 427 with more power than n/a LS7 even with mods.
If I was going to do it over I would be looking at a 8 or 10 speed with some kind of traction control.
Automatic transmissions are TQ multipliers. I had severe wheel hop until I solid mounted my differential , added 500 plus pound rear mono spring, and went to dual adjustable qa1 rear shocks. Then it was just traction problems that even 345 width rear tires couldn't solve.
To make my car work again I went to a manual transmission 5 speed. If you truly have 600 hp you have to go manual unless you have power limiting traction control
You can have 700r4s built for 850 hp. I had one from art carr. Never had a problem running my 427 with more power than n/a LS7 even with mods.
If I was going to do it over I would be looking at a 8 or 10 speed with some kind of traction control.
Automatic transmissions are TQ multipliers. I had severe wheel hop until I solid mounted my differential , added 500 plus pound rear mono spring, and went to dual adjustable qa1 rear shocks. Then it was just traction problems that even 345 width rear tires couldn't solve.
To make my car work again I went to a manual transmission 5 speed. If you truly have 600 hp you have to go manual unless you have power limiting traction control
Thread Starter
Racer
Joined: Mar 2021
Posts: 278
Likes: 43
From: Kansas
Yes they can, Sonnax Beast Sun Shell, Sonnax Input Shell, Sonnax 6 pinion close ratio low gear set, 300M input shaft and your favorite shift kit will hold more than 550 to 600 , the 70 has a slightly deeper bell housing over a 60 or 65 for stronger multi clutch Lock-up unit inside the Torque Converter
Thread Starter
Racer
Joined: Mar 2021
Posts: 278
Likes: 43
From: Kansas
i was going with a LS3 and then adding forced induction down the road. But with the more I look into traction problems I may just stay NA
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Drifting
Joined: Aug 2019
Posts: 1,510
Likes: 498
I have never used the Sonnax input drum myself or the 300M shaft but built many at 450 hp level with a 9 clutch conversion on 3rd clutch that would be fine at a little more power , the input drum and shaft are more turbo 1200 plus applications ...