all im gonna ask is why?

 

Why not run the 4L80E?

I had a 700R4 (basically a 4L60E) in my 85 Corvette and kept munching those bitches. Threw in the 4L80E and love it. The gear split is much better between 1st and 2nd

 

That's a major step backwards. The 4l60 is a junk trans

 

wtf? why in the hell would you go so far backwards? a 6L80 is a major upgrade over a 4l65. SMH

 

lol as much as I hate 6L80's they are better then 4L6anythings.

If you start in 2nd with the 6L80 its close to a 4L80. 2.48, 1.48,1 ratios vs 2.36, 1.53, 1.15

 

Yeah, that's definitely a step backwards.... Why?

 

What ever happened to this build? I'm considering doing this to my 08 C6 manual trans.

 

it can be done but if for pure drag racing purposes than just go with the th400 otherwise the built 4l60e is NOT going to hold anymore power than the 6l80 ive done tons of research on this and there is Nothing that says the 4l60 is going to be any better its 2 less gears and breaks faster than the 6l80 even built what is factual is the 6l80 has held up to many and i mean alot of 700-850hp cars factory stock the thing is the tuning with the 6l80 thats the key! the 4l60 is just way more common and easier to rebuild the fastest 6l80 factory stock has gone 8 sec 1/4 several outings, the fastest 4l60 high 9s then immediately broke but again im NO expert nor am i a vendor or rep so take this info and do your own research and see for yourself good luck

 

yea you mention that tuning is the key with the 6l80. That’s the same case with the 4l60. Early on people realized with the 6l80 if you cut the tq management off, it would die a very quick death. Cut the tq management off on a 4l60 and it’ll die too, but not as quick. So think about that for a second. I disable the tq management on my turbo car with a 4l60. Broke it on the second pass after doing that. Coincidence? Fixed the trans, turned tq management back on, 2 years later it’ll still going and with ALOT more power in front of it. It’s not the trans fault most of the time. It’s the tuner and builder.

 

yes i agree for years and years ive been told the 4l60 was junk and that no matter what its better to scrap it and go turbo 400 but nope in my 02 WS6 with the yank converter is lasted over 10 years as my daily and tons of track and street abuse

 

Old thread, BUT.....My tuner said this many years ago. Do NOT eliminate TM!! Do adjust it upward. I can't remember what the break away TM was in my 2000 C5 with a stock 4L60E. IIRC, it was like 450ft/lbs. Tuner set it at 1,000ft/lbs. I'm NOT a tuner. But I'm on my 2nd 427 engine, a built LS7. 1st motor was a Darton sleeved 427, because the LS7 didn't exist back then (early 2005). But what did exist back then was the same, stock 4L60E. Only thing that isn't stock is the Yank 3,200 stall converter. I've NEVER had any issues with it. I don't beat the living Hell out of it, but it's made at least 40 dragstrip runs. Trans currently has almost 118,000 miles on it. The last 60,000 plus miles has seen it handle 2 different 427s, the Yank converter, and 500+whp from each engine. Only maintenance has been a fluid and filter change at 100,000 miles. Fluid looked good, no metal shavings, nothing. The computer controlled TM, and the eliminated TV cable are probably the 2 main differences between it, and the 700R4, that make it live.