communication VORTEC & Allison

do u know how can i connect a vortec 5.7 corvette with an Alission automatic gearbox?

Im assuming you mean an LT1?

You'll probably need an adapter plate.

no,
i need to find a solution to put together an engine - 5.7 corvette with an Alisson automatic gearbox.
have an idea?

well, assuming the bolt patterns don't match, you'll need an adapter plate. there's no other way. if the bolt pattern don't match, you need something in between to connect them.

what engine is it? (i know, it's a 5.7/350, but is it an LT1? LT5? other?)

what tranny is it? (model number)

why specifically an Allison transmission? would you settle for another GM one?

well, assuming the bolt patterns don't match, you'll need an adapter plate. there's no other way. if the bolt pattern don't match, you need something in between to connect them.

what engine is it? (i know, it's a 5.7/350, but is it an LT1? LT5? other?)

what tranny is it? (model number)

why specifically an Allison transmission? would you settle for another GM one?
i was injured in a car accident during my service - www.drorqe.com
so i have to use an automatic gear box. my sponsors are GM and we r building the car so it will look like a silverado. so from the opptions we have, we r going 4 an vortec 5.7 - it goes on the corvette has about 400hp, i need a heavy duty gearbox that can withhold the dakar race and thats why we chose the Allison.
now the problem is i need an after marketing solution so that the computer of the gear and engine will be able to communicate.

have an idea?

well, there's no doubt you can make the two work in harmony. it's just a decent amount of work involved. i believe the Silverado 2500HDs came with an Allison 5-speed auto mated to the Duramax.

definitely want a gas engine over a diesel?

an adapter plate can be custom made to bolt the two up, i just don't know about the splines and input shaft for the gearbox, that may be an issue.

the electrics shouldn't be a problem, you just need someone who knows their stuff when it comes to wiring looms, because i think you're going to need a custom one.

if you have the fund, you can build a chevy auto gearbox to mate to the engine and it'll hold up find. built road-going gearboxes are often built for drag racing and are put through a lot.

The guys in the Chevy F-Body (Camaro/FireBird) forums can probably help better than i can, they know their Chevy stuff inside-out:

http://www.automotiveforums.com/vbulletin/forumdisplay.php?f=2129

am a little lost in all these sites

do u know someone i can email to get a solution,
we are using a petrol car becuase of the regulations
a disel car would have to have a very big minimum weight

i know the engine and the gearbox each have a computer for themselves,
the problem ia to connect between them both

i've copied this thread to the Camaro forum, so those guys can see it too.

i'm sure they can help better than i can, i know more about Japanese/European engines.

i think using a heavy-built GM transmission would be better than an Allison unit. you can build them up to handle mroe power and to withstand harsh conditions (just make sure you have a couple of coolers for it) and it'll weigh less.

thx very much :)

which ones do u mean?


"i think using a heavy-built GM transmission "

I don't know the model number off-hand, but will look.

basically a road-going transmission with new internal parts that are stronger and more robust so they can withstand the race. i think that's easier than using an Allison, because they're small and lighter.

as much as i know
the allison is a heavy duty tranmission

if u remember tell me, would be happy to learn

A GM 4L60E transmission should bolt right up to the engine (Which i assume is an LS6)

(someone correct me if i'm wrong)

The 4L60E came in the '03-'04 corvette with the LS1 engine.

as much as i know
the allison is a heavy duty tranmission

they're definitely heavy-duty, but they're designed for big diesel engines, and you may run into problems with connecting one to a small-block engine because of the splines/input shaft/bolt patterns.

using something like a 4L60E transmission, with uprated internal parts would do the same job, take the same power and last just as long. but it would be phyiscally smaller and lights.

of course, it's you're truck and your decision, i just think it's overkill and a lot of weight you don't neccessairly need. since you can take a smaller lighter gearbox and make it handle the same.

by the way - nice 2 meet
my name is dror and i live in tel aviv, israel :)

i know the GM 4L60E transmission is on the Hummer H2 but the mecanicks here think the allison is much better and stronger

we thought of putting the 4LS80E but we know of a lot of electrical problems
and it fits perfectly but
the main issue in the dakar is realibilty

That will get tricky. If you are using the corvette's induction system and ECM it won't be economically feasible. You'd probably need some kind of computer between them that can read what the Vette's ECM is saying, interpret it and then out put it to the transmission's ECM so it can understand what the engine is doing. The old Corvette ECM's were 8 bit and "spoke" in assembly language in one direction only. The newer ECM's are 16 bit (don't know what language they use) and are bi-directional in their communication.
It could probably be done but after solving the physical mating problems, you'd need a computer programmer that knows vehicle ECM's and possibly someone that builds custom ECM's. You'd be talking big money there.

You could look into one of these http://www.transmissioncenter.net/700MegaRaptor.htm
They have 700R4 transmissions, 4L60E's and 4L80E's. The 4L80E is what came in a lot of trucks and is basically a 4 speed electronic version of GM's old TH400 transmission, the heaviest duty trans they made back in the day.
The above transmissions are all built for racing/ extreme duty use and basically have no stock factory parts in them any more.

by the way - nice 2 meet
my name is dror and i live in tel aviv, israel :)

Hi, i'm Chris. From London in England.

I looked on your site, you've done some amazing things. it's inspiring.

vortec - allison -morely
we thoght of using this trnsmission but we know of a lot of electrical problems with it
and we the allison has 6 gears and is a heavy duty one.

who can do this after marketing connection between the engine and the gearbox? has anyone done it before?

vortec - allison -morley
we thoght of using this trnsmission but we know of a lot of electrical problems with it
and we the allison has 6 gears and is a heavy duty one.

who can do this after marketing connection between the engine and the gearbox? has anyone done it before?


hi chris - can u pass it to morley
and ya
look at this website
www.dror-dakar.com (http://www.dror-dakar.com)

can u pass this please to morley

ya - i like doing extreme things

check this -www drordakar com

we thoght of using this trnsmission but we know of a lot of electrical problems with it
and we the allison has 6 gears and is a heavy duty one.

who can do this after marketing connection between the engine and the gearbox? has anyone done it before?

i sent it on.

i don't know about that particular work, connecting an Allison to a Vortec, but it's been done in lots of combinations.

it's not cheap, and you'll need to find a machine shop that can do it. there are plenty in the US, i don't know much about the aftermarket auto industry in Isreal though.

although that gearbox has 6 gears, they're all very short gear, as it's designed for a diesel that only revs to 3,000rpm. with such a short rev range, diesels have lots of gears to help acceleration. tall gearing puts a lot of strain on the engine. and although it's heavy-duty, a stock Allison isn't built for Paris-Dakar.

it's fine for towing and road usage, but in stock form it's not designed for that kind of work.

a 4-speed GM with give you the same acceleration and speed as a 6-speed allison becuase of the different gearing. it'll also save you a HUGE amount of time and money because you won't need adapter plates and custom wiring looms. connecting the Allison to anything other than a GM diesel will be a huge headache.

you'd need to talk to a company that specialised in off-roading or fabrication or car electronics for that work. it's not something easy.

can u pass this please to morley

ya - i like doing extreme things

check this -www drordakar com

we thoght of using this trnsmission but we know of a lot of electrical problems with it
and we the allison has 6 gears and is a heavy duty one.

who can do this after marketing connection between the engine and the gearbox? has anyone done it before?
I sent you a PM reply. Other than contacting Allison or GM directly, I have no ideas on the Allison transmission.
Another option would be to contact the makers of the Raptor transmissions and explain what you are wanting to do and where the transmission is going to be used. Ask if they can build you a transmission that will hold up to that treatment. If they say they can, see if you can get a discount if you put their name on your vehicle for the race. If you even finish in the top 10 it would be great publicity for them and they could use in in their advertising. Good for their business and good for you to get a specially built transmission for less than just going out and buying one.

Another rebuilder to try is http://www.700r4l60e.com/

I know both companies have very good customer service and like to hear from their customers. They are both kind of small but very specialized. having their name on a vehicle in an international event like you are entering would be big for them.

chris - thx u so much
appreachate this

thx Morley please also
will call them monday morning

dror

No worries.

Just remember me when you cross the finish line.. :smooch:

chris - thx u so much
appreachate this

thx Morley please also
will call them monday morning

dror
Come back and let us know how things go/went with the transmission. I'm going to follow the Dakar this year to see how you are doing. Best of luck to you.