Both of these have better gearing than 94-97 transmissions. Now, if you run an M28 or M29 with a 3.73, you can put 4.10s in a 94-97 and get the same results, and at highway speeds, 6th gear will run at a lower RPM (0.50 ratio) than with a M28/M29. Suppose you go with a 4.10 and M28/M29. Why can't you just move up to 4.30s (12 bolt) or 4.56s in a 94-97?
I've done some calculations and I really don't see their real advantage. Can anyone help?

 

OK, but that still doesn't answer my question. Like I already said, you could go with a 4.30 or 4.56 and still achieve the same effect. Is there a good reason why the numerically higher gears in the transmission are better than numerically higher gears in the rear?

 

my bad, brain fart>me ...i will refer to the 94+ tranny as X
are you looking for the advantage of the m28/9 with lower rear gear over the X combo with higher rear gear?
if so, the main advantage i see is the M28/9 has a higher first gear; 2.66 for X, 2.97 for M29, 3.36 for M28, but will have the same crusing speed with a comparable gear in the 94+...the M28/9 has a bigger 4-5 and 5-6 rpm drop than the X which offsets the higher numerically first 3 gears...to sum it up, if the M trannies and X have the same rear gear in the same car the X will cruise at a lower rpm on the highway, but the M's will get to the limit faster ...hope that helped a lil

 

Do a search for jimlab he did a lot of the math for this... i think its gears revisited or something like that.

 

Thanks, that helped. So did you end up buying the Racelogic TCS?

 

Yes i have it...

waiting for my rear end with the 4channel AND 3 channel setup to get here so i can use my factory abs and the racelogic system.

 

How much? Where from? Did you get the launch assist too?
Thanks.

 

Price was 1400 don't remember where.. launch assist yes....

 

Must've been from the US dealer. I thought you got into some GP like jimlab did. Either way, post your impressions when you install it. I'll be getting one too.

 

I will.... i sure hope its worth the money.. yes it was from a US dealer...

 

I've got a friend with a ~780 RWHP Supra who loves it. He says it sounds like a two-step when it kicks in, but it makes it insanely easy to put the power down instead of going up in smoke.

 

I don't know all the ratios inside the M28 / M29, but isn't it something to do with close-ratio vs. wide-ratio as much as anything? Sorta like how the Z06 T-56 has different ratios than the standard T-56 has?

 

Exactly. If they had different ratios but relatively equal drops between each gear there wouldn't be much of a point, any difference between the two would be cancelled by using different differential gear ratios. So, from a performance standpoint, close ratio is generally better, especially with a six speed. It's a little harder to do with a 5 speed because if you get them too close you won't have any gear left for cruising, which is very important for larger engines that don't like screaming down the highway.

 

if i'm not mistaken wasn't one of the m28/m29 trans missions rated to only 350ftlbs and the other 400ftlbs of torque due to the different gears?

whereas the later model t56 trans were 450ft lbs?

 

The real advantage is the following....

everytime you shift, the m29 tranny will be higher in revs than the 94-97.

Which means.. geared correctly you havea faster car... hence why the z06 came with that gear and the c6 z51 has it also...

makes you wonder