new 5spd autos

[matty67]

Like the ones outta the Caddy's. Since gm is caught without their pants in almost every market segment they would be quite a pretty penny but how would they fit with a SyTy?

 

[ItsMyTy]

i'd bet they are weaker than the 700

 

[Captain Morgan]

Like the ones outta the Caddy's. Since gm is caught without their pants in almost every market segment they would be quite a pretty penny but how would they fit with a SyTy?

i'd bet they are weaker than the 700

the 5L50E is actually used in an AWD platform, however the 5L50E is nothing more than a 5L40E.

Going by how GM names their transmissions now...

5 = 5 Forward Speeds
L = Longitudaly Mounted
50 = # supposedly relative torque value (80 is better than 60 which is better than 50, ect ect)
E = Electronically Shifted

So if all thats true, then yes, the Caddy 5 speed will be weaker than the current 4L65E or even our stock 700R4's.

 

[supersports10]

how bout the allison 1000 out of a one ton 3500

it has a chevy bolt pattern, and a 5 speed.

but.... would it bolt up to our transfercases??

 

[TurboTony]

how bout the allison 1000 out of a one ton 3500

it has a chevy bolt pattern, and a 5 speed.

but.... would it bolt up to our transfercases??

Well it weighs as much as the whole truck itself and is bigger than the motor physicaly. Maybe with an 8 inch body lift you could squeeze it in.

Tony

 

[ericguy320]

how bout the allison 1000 out of a one ton 3500

it has a chevy bolt pattern, and a 5 speed.

but.... would it bolt up to our transfercases??

Well it weighs as much as the whole truck itself and is bigger than the motor physicaly. Maybe with an 8 inch body lift you could squeeze it in.

Tony

the TC is over 100 lbs

 

['JustDreamin']

I don't think the Allison would be a practical solution.

Its bigger and heavier than the 4L80E. That probably implies that it will "use" more power than the 80E (parasitic losses) but also due to its weight will require more power to run the same et's / mph.

The output shaft is likely to be the same size or bigger than the 4L80E (which doesn't fit the BW4472 either) so maybe that isn't any worse, but its not any better.

They're also pretty expensive. I think you could find a reasonably "cheap" 4L80e but I doubt you'll find inexpensive Allisons (or even inexpensive cores for rebuiliding). Mostly because you will only find them in the 8.1 or 6.6 TD trucks from the last couple years.

All in all, I don't know that its a worthwhile thing to pursue. For the money you'd spend, I think you could jump into a Lenco or Liberty 5speed planetary, and not be any slower or poorer. And it certainly would be high on the cool factor list. Then all you'd have to figure out is how to build boost at the starting line.

'Dreamin'

 

[ghettosled]

you guys dont even want to know how much it costs to build up an allison correctly. Stock they handle about 350 rwhp on the duramaxes, then you need to go through em.

And yes, the converters are about 80 lbs dry. HUGE mother sucker.