Transmission backwards compatibility

Anyone else completely satisfied with their current 2nd gen but want better mpg? What are the chances that the new 6spd auto would be compatible with our old 4.0l's? Would probably be good for a couple MPG but I doubt it would bolt up.....

 

0% chance. Does a Honda 2006 R-series 5 speed auto work on a 2005 D series 4 speed auto Civic? Same concept here except even more advanced.

Too many threads like this honestly and I see 3 options. Sell your Tacoma and get something else, have a cheap reliable secondary car, become a dentist.

 

How much gas would a brand new transmission and labour buy you?

 

It would be a very expensive venture to say the least. Add on the additional heartache when you put your tranny oil in your coolant, coolant in your brake reservoir, and engine oil in your windshield wiper tank, and finally engine oil in your tranny.

My apologies, Krazie. I could not help myself.

 

I don't see the problem?

 

Go change your transmission out and see.

Disclaimer: I am not responsible for what happens next.

 

Let's do some math. Say your Tacoma gets about 20 mpg and by swapping the transmission it gets you all the way to 23 mpg - I doubt it would be that good, but lets be generous and say the transmission is a miracle worker.

And lets say you run the truck for 200k miles. At 20 mpg you will buy 10,000 gallons of gas. At 23 mpg you will buy 8,700 gallons of gas. So you'll save 1,300 gallons of gas with a miracle transmission over a 200k mile service life.

Lets say gas averages $3/gal over that time. You'll save $4,000 by swapping in that miracle transmission.

Of course those numbers were all extremely generous, the actual savings is probably half that. And you pay for the transmission swap upfront and have to recover the savings over a decade or so. So time value of money means the real savings are even less. You also have to take the risk of various mechanical issues that might arise from the experimental swap. If you get into an accident and total the vehicle you'll never recover the cost of the transmission swap either.

Bottom line it seems like a bad financial move even if it was possible (and I very much doubt it is possible).

Go get one of those magnetic vortex fuel saver things you clip onto your fuel line. Yeah, it doesn't do a thing, but it is probably a better financial decision than the transmission swap simply because it doesn't cost much money.

 

I just did a tranny oil change on mine. No. Do you know how much tang I had to buy to put through the exhaust?

 

How did a simple question of "do you think they'll be compatible" turn into a cost/benefit analysis?

 

Because if it's not financially viable who cares if it's backwards compatible?

 

Who gives a crap about if it is financially viable. The OP asked if a newer transmission would be compatible, not peoples idea on how to spend money. Simple question, not an invite to an economics summit.
OP, I don't know if the bolt patterns and TC designs would be the same. As Rock Lobster said, it would probably require a new/altered wiring harness and ECU/PCM.

 

probably be cheaper and better to trade in the old truck and buy the new one.

 

I would actually be more interested in knowing if the new manual 6 speed would be a simple swap in for the old one. I assume they just made internal modifications.

 

He specifically said he was interested in doing it because he wanted increased MPG. Why on earth would you want more MPG besides to save money, eh?

Go take a chill pill already.

 

^Thankfully someone has logic processing skills here.

 

No shit. There I was.

When I realized.





I was balls deep in a dead prostitute.







BUT














































It was still better than this thread turned out.

I do not believe that is feasible. The electronics will be a bitch. Trans expensive.

IF YOU WANTED TO DO IT ANYWAY!
-likely a GR series for the new engine.
which means that you MAY be able to use a lexus or some other bell idk. Probably figure for custom anyway.
-will have to have custom electronics made. They will be integrated to the new truck, and no plug and play type stuff. If you are an electrical wiz and can figure them out. Then you should be able to afford to pay someone else anyway

Basically it will be in the anything can be done category. There will not be a backward compatibility easy solution, and likely not an aftermarket one for years if ever at all.

 

Don't listen to any of them. If you want to do it, go for it. Just post lots of pictures for reference.

 

Yeah, if you want to and can get it done go for it!

I meant more along the lines of this thread if full of crap instantly not that the original idea is retarded.

The $$$ factor says not a good idea from what we know now.

The likelihood that it is easy is very very small.. And expensive is very very high.

BUT then if say you really love your 2nd gen, and wanted to keep it forever then it doesn't sound that bad.

Look how many of us swap newer Taco drivetrains in old Toyota's even when it is not economical.

Good luck either way!

 

Some things get better with age