I have a friend that desperately needs a new trans, but also needs to save money. Anyone know if it is possilbe to use a 4th gen auto in a 5th gen (2002)? Thanks for the help guys!

 

NO!!!
5.5 gen auto tranny 5SPD

 

Thanks thats what I needed to know.

 

are you talking about?

The 5.5g is NOT 5AT, it's still 4 AT.

As far as i know, the only difference is the final drive ratio (3.619 4th gen and 3.7899 in 00+)

 

No. The 3.5 will chew the 4th gen auto and spit it out like whoa.

 

Another good point. Thanks.

 

I am presently in the process of putting a 3.5 in my 4th Gen auto, I believe the 4th Gen auto is superior to the 5.5 Gen. It shifts faster and it will certainly hold a 3.5, it has already stood up to numerous 12 sec 1/4's with the 3.0 in it. I don't see any reason why a 3.5 will chew it up.

 

Well, in retrospect what i should've said it will destroy the 4th gen auto long-term. In the short-term it could work, just not sure for how long since no one has tried it.

 

Torque. I know that the 4G auto saw more torque than stock with the nitrous setup, but keep in mind that the time you spent racing at the track was only a fraction of the time. The 3.5 torque will be full-time, and i don't see the 4th gen auto standing up to abuse on a regular basis. Baby it, and it might last. japmaxse tore his 4th gen auto up with his hybrid 3.5 setup. 3.5 block, 3.5 cams, 3.0 heads, JWT ECU, MEVI.

 

I tried it, but my results are jaded since I treated my auto like a redheaded step child.

 

Is it? sorry though.


Can u tell me what other diff between 5th gen and 5.5 gen trannies?
Not being sarcastic just curious

 

gated shifter and the F/D ... that's all I know, and I don't know much.

 

Well that was kinda what i was getting at. Of course the 4G auto will last with a 3.5 IF you baby it, but who's gonna go through the trouble of a 3.5 swap to be easy on the throttle all the time? Conflict of interests...



2 other points that i wanted to make were these:

1. The 5.5 gen is CONSIDERABLY heavier than the 4G, somewhere in the neighborhood of 300 lbs.

2. The 5.5 gen ECU allows for more ignition timing than the 4g 3.5 guys and the VTC's which make for more torque

Both of these things will make for far more stress than the stock 4g auto was designed to handle on a regular basis.

 

You guys are getting way to technical. It does not work because the electronics are different. Unless you want to rewire the TCU, it is not worth it at ALL.

 

Until someone cracks open the 4 & 5.5g auto and proves that there is anything different we really cant split hairs w/o the facts.


I do agree with Jime though.

When my 4g 4AT was in its prime, it shifted much more crisp than my 5.5g, until i got the VB mod in my 5.5g.

 

If you're going to go through the trouble of wiring it though, just use the 5AT from the 04+.

 

How crisply an auto shifts has nothing to do with it's power handling capalities. Not only that, but both Dubbya and japmaxse have burned through their autos with 3.5 swaps. Only reason there aren't more examples is because people aren't trying it with 4g autos period...guess they know better.

 

Well I am not putting the 3.5 in the 4th Gen to baby it. It is going in for racing. I have put over 200 runs on the 5.5 this year already and next year will be more.

So we will so how long the auto will last.

Maybe my driving habits are much different than most people but I race almost every weekend, the rest of the time I drive like the Grandpa I am. I have no interest in driving hard on the street.

I know lots of guys who have chewed up 5.5 Gen auto's as well but I now have over 400 1/4 mile runs on mine over a 2 year period and its still going strong.

This is not luck, my other 4th Gen auto's have faired just as well.

Also you can put a 3.5 in a 4th gen but very difficult (maybe impossible) to put the 5th Gen auto in a 4th gen because of the TCU as Kev indicated.

 

I never said it had anything to do with its power handling ability.

 

So how is what you said relevant to the discussion?

 

I chewed up 2 gears already with the 5-speed manual so I don't know about trying to put an auto through the same abuse. I'll admit one thing though. I rape the transmission on a daily basis. I drive it like it's rented (Get it Jime? ).

 

The 4G auto is not up to it long-term period. I've already given two examples of ppl that blew their autos and these were in a lighter 4g chassis. In a heavier car the damage would be exponential.

 

It's not, I just don't care for people putting words in my mouth.

And as far as this discussion goes, I stand by what I said ...


but feel free to split as many hairs as you want.

 

I think the question has been answered, thanks guys!

 

Not a good idea. Like everyone said the 3.5L will tax the 4gen tranny and it won't be alive very long.........