how much HP can 3400 handle

[gpse3400]

I heard 4T40/5-E it was somewhat modeled after the 4T80-E. If thats the case then I'll believe it to be a good unit. Not for nothing though the 60 series is rather complex..I'm just happy the oem aftermarket is there to remedy some problems. Overall I think when GM builds a transmission they build it not to last.....When the aftermarket steps in, it lasts...

[Quinky]

The 4T40E was a comepletely redesigned transmission from the ground up.. It shares a lot of its parts from the old 125 3peed.. GM didn't design it for the 3800 because they all ready had the 4T60 they could work with... That transmission had all ready been designed and built to fit behind some of there Caddilac V8's... Why would GM want to put a transmission that is untested behind a motor that big? They designed the transmission to be smaller to fit into there smaller cars...

The GTP 65e's are a special HD version.. To rebuild them you can't use the same parts you would for rebuilding any other 65..

You also have to look at the computer controld aspect of the transmissions and how thats working..

[imported_germ]

show me proof that a 4t40/45 can handle 300 hp DAILY driven on STOCK internals?

i can show you a few 60e's (myself included) and i can show you a LOT of 65's that handle over 300 HP (non HD version).

until i see a single 4t40/4t45 that handled 300 hp all the time, well, you really cant say they handle more power than the 60/65's.

i mean, max hp and max tq #'s mean something, and the 40/45's ARE LOWER than the 60/65's, but i guess #'s dont mean anything in real life and only what you guys see huh?

maybe there is a reason why you see more 60/65's other than the fact that the 60 has been around since.... the 80's. thats what about 20 years the 60 has been on the roads.... and how many makes and models had the very popular 60 tranny? a lot.


either way, you stick to your 40/45's and i will stick with the 60e.

[sharkey]

maybe there is a reason why you see more 60/65's other than the fact that the 60 has been around since.... the 80's. thats what about 20 years the 60 has been on the roads.... and how many makes and models had the very popular 60 tranny? a lot.

sure the 4t60e had been around for 20 years (so to speak) but they were garbage then and they are still no better. the majority of 4t60e/65e's i see are 97+, i rarly see a 440t4 anymore (most are gone, or people dont fix them much anymore).

when you compare these trannies, the best abuse situation is a taxi. they get the living crap beat outa them 24/7. a 4t60e will last 200 k km if they are lucky, and a 4t45e will last 300k+ km. our world of making engines faster isnt the real world.

4t60e/65e- has problems, can be beefed up easily
4t40e/45e- pretty sound tranny, no updates avalible, they arent needed.

basicly i wouldnt buy any gm with an auto in it, imho, they are all garbage. same goes for ford. chrysler rwd is not bad, fwd is garbage. the only car with an auto i would own would be an import, they are pretty sound trannies.

[bszopi]

Once again, how many taxis use 4T40/5Es?!?! The only car I can even think of is the Malibu, and how many of those do you see as taxis. I have seen maybe a couple. Perhaps other citys are going to them more, but still...

I for one will stand behind the ability of the 4T60E. Why? Because I treat mine like absolute crap and its still going. Not, its not like I abuse it by dragging, or neutral drops, etc... I've had a fluid leak for over 3 years now that I just don't have the urge to fix. And I really don't ever check the tranny fluid (yeah, the bad mechanic side of me is showing...). The only time I know to put more fluid in is when going around turns and the tranny comes out of gear cause it has no fluid. So I drive it like that for a few more days usually until I pick up a quart or two of ATF. When I put it in, you can tell the tranny is heating up because the dipstick starts to curl from the heat. And I even have a tranny cooler. Yet, the tranny is pushing 130,000 miles and still running strong. Maybe not as well as it did when I first got it, but it hasn't stranded me anywhere.

[sharkey]

there are lots of malibu cabs around here. in fact, its hard to find a cab thats not a malibu.

[Quinky]

I am speaking from experience.. not numbers I have read... The things I say are things that I see with my own eyes from working in the trade.. I know how tuff a 60/65e can be once built up.. My shop warrentys taxi's for 9months.. in that time they drive on average 120,000 - 150,000km...

[TurboGTU]

SO I wonder if the F7 has the same problems...just thoght I ask.

[imported_germ]

brad, im with you on this one...


ive got the 60e in my car with 200,000 miles on the STOCK tranny, changed the fluid ONCE and i beat the living fuck out of my car.

its probably got over 100 drag strip passes, probably as many street race passes, 20 round trip voyages from Minneapolis to just east of Indianapolis, 60,000 miles on a DHP reprogramed PCM shifting at 6200 rpms, 20,000 miles with a turbo attached (pushing over 300HP).

like i said before, show me proof of ONE 4t40/45 that has handled over 300 hp and lasted more than 20,000 miles.

can you?

[Quinky]

John Lenko.. His old 2000 Cavi... All the bolt ons possible, 85 shot dry kit, slicks, auto trans interceptor with line pressure at 100%... consitant 13.8 passes using the nitrous off the line... Not 300hp.. but he beat the living snot out of his car and the transmission never crapped out in the couple of years he was racing it...

both of you are talking from experience with your own cars.. Thats all fine and dandy you guys are two of how many cars out there? My shop does 60% of the cabs in the lowermain land... I have re-and-re so many 60s/65s I can have them out and back in the car in an hour...

The 4T40/45 was designed to be a lighter duty transmission than the 60/65.. It was build to fit into the smaller cars...It's not met for the higher hp when run off the stock computer controls.. Line pressure is to low, shifting is slimmy and even stock it slips to much when you drive it hard.. GM did this for comfort.. If you boost the line pressure for firmer shifts the transmission can hold higher hp numbers..

You guys like looking at the hp ratings so lets look at it this way... Why is it that when the 60/65 is run AT ITS HP RAITINGS it fails more often then a 4T40/45?? Show me real proof that this isn't true...

[imported_germ]

john lenko huh? kinda easy to hold on to a tranny for a while when your only power adder is a button that is not turned on all the time.

and your comparing a tranny made in 2000, a year in which the 4t60e was no longer available.

so of course a newer tranny will hold "some" power for a "little" while. especially when you dont have the power "turned on" while driving.


N2O doesnt count IMO, just my .02 though.

[imported_germ]

so lets talk about his car now...


00 cavi

2.2 4cyl = ~115 plus the 85 shot that he used, = ~200 CRANK hp + the misc small other power adders, maybe another 20 hp, so thats 220 crank HP

seems to me that he didnt exceep the max HP #'s to me.

http://www.j-body.org/frame.php?url=http://members.shaw.ca/johnZ24

look around his site.

[Quinky]

It wasn't a 2.2.. it was a 2.4... nitrous might not be on all the time but in his car even daily driving he used it... in 2000 the 4T60e was still availible in luminas..

you never answerd my question...

"You guys like looking at the hp ratings so lets look at it this way... Why is it that when the 60/65 is run AT ITS HP RAITINGS it fails more often then a 4T40/45?? Show me real proof that this isn't true..."

[bszopi]

It really doesn't matter because obviously you guys anf your taxis will always be right. Obviously neither of you have gone over to www.grandamgt.com and read any of the complaints about the 40/45. Anyway, that's not what this thread is about, and no one is going to stop the arguement that they are right and the other is wrong, so lets just drop it.

[bszopi]

Not sure why Todd hasn't posted here (maybe because the thread name doesn't bring up trannies), but here are some pictures of your "strong" tranny...

http://groomlakelabs.com/gallery/transmission