6 speed to MkIII swap

[Athena]

I was hoping to get some info on how feasible it would be to swap a w58 to the mkIV's six speed.
I've searched around and it seems the shifter won't be in the right place?
What would need to be done to fix that, and what other mods that need to be done. Any info would be great.

Thanks,

Christopher

 

[closetnerd]

Why in the world would you want the 6 speed??

 

[Sawbladz]

Hope you have deep pockets. Go price the getrag and then come back to this question.

 

[Moy]

you can buy 2-3 MK3's for the price of one V160.

If you can afford it, then you'll need an adapter plate made to mate it to the 7M block, you'll need a custom flywheel to mate to the 7M crank pattern. You'll have to convert from mechanical speedometer to an electronic one. You'll have to bang out the trans tunnel, reposition the shifter hole, get a custom driveshaft.

There's more obviously, but that's the big stuff.

Ask Sound Performance what would be needed, they've done a 2JZ-GTE with Getrag V160 swap into a MK3 IIRC

 

[Poodles]

Tranny is what, $3K by itself used? Better off with one of the other 6 speeds (TKO, T56...)

 

[Athena]

I've seen the prices, and though I don't have cash out the ass, depending on what mods would need to be done, and weighing the pros and cons of simply changing to the 154, I'd buy it.

Edit: A lot of posts I didn't get to read, my bad.
It's late and I feel retarded since I thought I had this in my first post, but I've already swapped out my 7m.
I'm running a stock 2jzgte on a w58 right now.
and Yes, I figured I'd be looking at 2-3k.

 

[Sawbladz]

I'm fairly certain you also need a diff with a much lower ratio to make the 6 speed work properly. Something like a 3.27.

 

[Keros]

I'm fairly certain you also need a diff with a much lower ratio to make the 6 speed work properly. Something like a 3.27.

Absalutely the #1 reason why I laugh at all these "ZOMG V160 in mah MkIII yoz!" posts.

If you do some research about the gear ratios in the V160/V161, you'll see that they are only suitable for a really low ratio diff, in the land of 3.2X, as Sawbladz mentioned. Any higher... like say, 3.73, like what is the lowest ratio, commonly available MkIII diff, and you'll swim gears more than you drive. Ontop of that, your top speed will be significantly lower and your highway milage will suffer. Furthermore, you may as well skip 3rd in the V160 because the ratios between 2nd, 3rd, and 4th are so close anyway... effectively making it a 5 speed.

Jawsgear made a 3.50 (I think) diff for the MkIII ages ago but as far as I know they aren't available anymore... unless you've REALLY got money.

If you want a 6 speed, a T56 is a MUCH better idea. It's geared very similair to an R154, but with an extra gear after 5th, making the T56 "double overdrive". It's ideal for a 7M which can lug around at 1200rpm without issues. The T56 wieghs about 130lbs and has a few weak spots... if you wanted to do it, get a trans out of a Viper or get a rebuilt unit from one of the many trans shops that rebuilds them.

I don't know what you'd do for a clutch and flywheel on a T56, but you'd be just as SOL with a V16X trans anyway, but atleast you'll have more money to spend making custom stuff because the trans isn't 5 grand. A rebuilt T56 is ~2500-3500 depending on the specs, and a used one is probably a grand. Also, there's adaptor plates kicking around for 7M to GM bellhousings, I'm sure success could be found adapting the two. For a 1JZ series motor with a T56, a 4.10 gear set would probably be a neccessity. The T56 also has a funky clutch arrangement, so you'd have to do some research and figure out how to adapt an existing clutch and flywheel onto a 7M, I'd imagine... probably cheaper than making a 7M flywheel and clutch work on a T56.

Just my 2 cents.

Edit: To actually put a T56 in a MkIII would be easy: custom driveshaft, BFH [Big F*cking Hammer] to pound the sh** out of the trans tunnel, a custom bent shifter, custom transmount, and all the adaptors and stuff mentioned previously. Piece of cake really...

The only reason I'd do it is to go over 200MPH and still get good gas milage. But those two concepts next to each other is rediculous anyway.

 

[Athena]

Thanks for all the info, it seems a swap to the r154 will probably be the answer in the end.
One thing I'd like to clarify though, I'm not using the 7m, I've already swapped it out for the 2jzgte.
Not "thinking about it" but have already done it. Thats why I was considering the six speed. Unless its more trouble than its worth, which seems to be the case.

Thanks again for all the info.

 

[Poodles]

A good rebuilt R154 will be fine unless you want to run rediculous power, plus it's a bolt in with the right parts.