Goatman1970

iTrader: (1)

Just out of curiosity, anyone ever heard of anyone doing something like that? A trans that was properly modified to handle the torque of course..

Predator T/A

iTrader: (7)

wont last long

ArkBird96

Not a good idea at all. My guess is that it would last about 3 hours before it

artypyro

iTrader: (4)

what kind of diesel?

artypyro

iTrader: (4)

what i mean is gm put 700r4 behind the ole 6.2

Goatman1970

iTrader: (1)

What if you has, say, a Performabuilt Level III Invincible behind a stock 365 hp Dmax?

They're (trans) rated for 800 rwhp, which has to be somewhere around 600 ftlbs of torque at the wheels.

Something like that should hold up, no?

Predator T/A

iTrader: (7)

there is a big difference in the torque dynamics of a deisel and a gas motor a a gas motor usually peaks somehwere around 3-4 gran wheras a diesel peaks damn near at idle to 2500
with a gas motor you usually have a little more momentum before it peaks with the weight to low end torque ratio of a deisel the trans will be stressed exspecially with a load....get a 4l80e

dieseltech71

use a good converter and sun shell, It will hold up to the 6.2, or the 6.5. Dont even try it behind a duramax. I have done several trany's with the older diesel and they hold fine if you build them right.

Predator T/A

iTrader: (7)

I am lookin at it this way why spend the money on building a good trans, then getting the software in the pcm to shift it "tuning" special built converter would have to be a billet front cover. some kind of conversion kit for mounts and wiring. by the time you get here you are at easily 4 gran or so and you still have a insuffiencient trans for your needs if you have a diesel you tow. get a 4l80e and save some money. hell GM has them for 1800 with a 5yr warranty 100k

Goatman1970

iTrader: (1)

Say someone already had the trans...

Can someone explain how a trans is effected by where a torque peak occurs in the rpm band please? Theoretically, a gas engine could make the same torque at 1800 rpm as a diesel, if geared properly in OD... So I'm not quite sure how that would make a difference. In other words, isn't 500 ftlbs always 500 ftlbs, no matter what gear?

Predator T/A

iTrader: (7)

there is a big difference in 500ftlbs off the line as opposed to 500 ft lbs at 4500 rpm when the vehicle is in motion there is less load and stress on the hard parts as the weight of the vehicle is in motion.

usmc320

iTrader: (3)

I say go for it and post up the results! LOL

It MIGHT be alright if you have a stock 6.2 only because they're dogs as far as power goes. Even those had a th400 behind them though. That should tell you something.

Goatman1970

iTrader: (1)

That tells me technology and hard parts weren't what they were.


If I do it, it would be a Duramax..


Still unclear what the difference is between 500ftlbs at 1800 rpm is in 1st gear vs 4th...

lt1pwr1

iTrader: (1)

Man....would be a disgrace to replace that Allison trans with a 60/65E. Oh, and yeah I'm sure it would grenade in no time with these new Duramax's at around 600-700 ft. lbs of torque.

SPRAYED 01

iTrader: (22)

I'm running 700ftlb using a t brake at 3800lbs. An 80 would def be better but its not crazy to think a 65 built up couldn't last.

Goatman1970

iTrader: (1)

I clearly stated using one with 365 hp/520 ftlbs...

The Allison won't fit in a 70's GM A-body...

Goatman1970

iTrader: (1)

I agree completely. If a transmission is rated for a certain torque or HP, I'm not sure why or how RPM factors into it...


And since no one here can explain it, other than to say "it won't work", I'm guessing they're just guessing as well..

I'll probaby just call Performabuilt and ask to get an actual real answer. Think of how much more efficient the Duramax would be with a 4L65E behind it instead of an Allison or an 80E sucking up power!

buddyholly

The 80e does not suck up any more power than the 60e...With the diesel you will be applying much more torque at a much lower rpm every time and at every shift, not just at higher rpm. The 4l60e will work behind the diesel, but is more prone to failure due to the constant torque. The 4l80e is much beefier internally and designed to take the torque and load of a diesel and hauling big loads. Same as normal, the 4l60e can be made plenty strong but you will have more headroom for the future with the 4l80e.
Either way, good luck with it!

lt1pwr1

iTrader: (1)

Ok, if you are talking about just putting the 65E behind your Dmax and driving it like that then yes I would assume it could handle the power. However, if you plan on using the truck for what it was intended (towing and hauling), I think anyone will tell you that trans won't hold. You say it will be "efficient" but replacing that trans 10 times will eat into the money you save on fuel.

Goatman1970

iTrader: (1)

And I think you should read the posts before you respond anymore....

I have also clearly stated this would be going in a 70' GM A-body...