stankinlancoln

I'm at the point in my build to where I need to choose transmissions. I have a 2006 4l80e, 2005 4l60e and 199? th400 all sitting in my garage. I search this forum for answers but haven't found exactly what I'm looking for. I've learn the 4l80e can handle more power than the 4l60e and th400 making it stronger. Also know the 4l80e will eat 20hp more than the 4l60e on a dyno. What I'm looking for is a side by side comparison with all three transmission mounted in a vehicle. I want to know which one will be faster street racing, drag racing, highway rolling start racing... If their were three of the same vehicles, same engines(ls3 580hp), same gears, same tires, same weight, SAME DRIVERS, everything the same other than transmissions.

Mystery Bird

iTrader: (7)

Sounds like you need to set the precedence if you have all three and want a comparison. I can tell you when I switched to an 80 from a 60 I did not see any loss. IF you do a search you will see some dyno numbers of a comparison and I don't remember it being much if any of a loss. As long as you don't use the monster stock 80 converter. I will never go back no matter what. I love the way the 80 works and changes the way the car runs on the street and the track. It is easier and cheaper to rebuild and does not need a long list of aftermarket hard parts to make it work.

mrvedit

Here is a good thread on the subject including a dyno comparison showing about a 5HP loss, not a 20HP loss:

https://ls1tech.com/forums/automatic...questions.html

Troy5061

iTrader: (19)

A manual valve body Th400 will be the cheapest and best at drag racing but IMO would suck on the street. I know people did it for years before OD guess im just a bitch. The 400 will also usually dyno the lowest depending on weather the OD units have triple discs and can lock at WOT. I had the same dilemma last year having all three transmissions sitting on the floor. Im glad I went with the 4L80e. I got my used one with unknown origins for $150 bucks and put in a $120 trans go 2 kit, its been great so far with my turbo setup. The shifts just feel so much better vs the 4L60e, I love the gear ratios in the 80e, it doesn't have that huge split between 1st and 2nd gear.

Blackpanther99

iTrader: (8)

People have seen gains from a 60e to a 80e AT THE TRACK.

On the dyno the results will vary alot. Youd be better off going to the strip and find out.

stankinlancoln

Thank for all the info.... 4l80e IT IS!! I just need to find a cross member bar for the trans. I've seen k members for Monte Carlo S.S g-bodies at summit and jegs for 4l60 and 4l65 but none for 4l80's

warriorcustoms

iTrader: (10)

Yeah 80E is the way to go!!! Got one waitin on My 396 LTx nitrous build As far as crossmember I think PATC has em... I think LoL Theres others but My ole brains a LiL fuzzy its been awhile since I researched all that LoL

Troy5061

iTrader: (19)

I believe Midwest chassis sells them, mine is a BMR one from WS6store.

Troy5061

iTrader: (19)

opps just noticed you said Monte haha not sure who makes one for that.

SnIpEz

iTrader: (4)

The crossmember from MWC is also has no torque arm provision so it can't be used in a lot of swaps unfortunately.