The M2B4 tranny.. - Honda Prelude Forum

The Oreo · 04-06-2006, 12:48 PM

here's a list of the tranny codes and ratios.

Prelude
M2A4 - JDM 4G
M2B4 - JDM 4G LSD
M2F4 - USDM 4G
M2U4 - JDM 5G Type-S ATTS/USDM Type-SH ATTS
M2Y4 - JDM/USDM 5G Base
M2Z4 - JDM 5G SiR S-Spec/JDM 5G w/ LSD option

Full Gear Ratios

M2A4 - 3.307 - 1.950 - 1.360 - 1.071 - 0.787 - 4.266
M2B4 - 3.307 - 1.950 - 1.360 - 1.071 - 0.787 - 4.266 LSD
M2F4 - 3.307 - 1.950 - 1.360 - 1.071 - 0.870 - 4.266
M2U4 - 3.285 - 1.956 - 1.344 - 1.034 - 0.812 - 4.266 ATTS
M2Y4 - 3.285 - 1.956 - 1.344 - 1.034 - 0.812 - 4.266
M2Z4 - 3.285 - 1.956 - 1.344 - 1.034 - 0.812 - 4.266 LSD

Alright first off if u notice, the gears are slightly shorter in the M2B4, than in the standard M2Y4.. I did notice that the rpms are the same as if i am driving with the M2Y4 all the way up until getting it into 5th gear..

The LSD is amazing in turns and in a straight line there is less wheel-hop (if u know what ur doing), and better acceleration... And not to mention the extra part that I love is I can drive at say 80 mph at a little over 3500 rpms now.. Excellent.. The tranny shifts wonderful also.. I bought it local with low mileage.. A little over 40k I was told.. It made me wish I had of bought the motor that was coupled to it..

But my motor is still good, except I have to get some vital seals replaced close to the timing belt area..

By the way.. No modifications were needed to be made to install this.. Bolts right up..

I wish I had of done this sooner... If I could have afforded it sooner, or knew about a jdm warehouse in my area..

Also.. I wanted to say sorry to a member on PO whom I begged to let me buy his tranny if I couldnt possibly find anything here.. My friend's shop had searched for a tranny (M2Y4), and it seems they are scarce or costly.. 1100 for one from a junkyard WITH NO WARRANTY, 2,000 for a rebuilt one with 3 year warranty.. And then my friend that works at the shop told me about a warehouse that imports right hand drive cars, motors, and trannys.. EVERYTHING just about.. I lucked out.. he had the guy lower the price and i picked it up.. I am sorry I couldnt help out a fellow luder here by buying his tranny.. That would have been the best option if i hadnt of found this one.. 1200 for a M2Y4 with quaife lsd is a great deal.. Thank u for your time none-the-less.. if ANYONE around my area needs a tranny I will send them your way.

Paul H22 · 04-06-2006, 12:59 PM

Awesome, hooray for LSD!

The Oreo · 04-06-2006, 01:07 PM

i love that picture!!

Paul H22 · 04-06-2006, 01:10 PM

Haha. Poor girl has no lower body. Never noticed that.

Daemione · 04-06-2006, 03:53 PM

Sounds pretty sweet, Keith . . . what's the name of the place you got it? They have a site?

And if you don't mind - how much did you pay?

liquidxnitez · 04-06-2006, 03:54 PM

Here's a question

M2B4 - 3.307 - 1.950 - 1.360 - 1.071 - 0.787 - 4.266 LSD
M2Y4 - 3.285 - 1.956 - 1.344 - 1.034 - 0.812 - 4.266

In comparing the ratios for these two transmissions, wouldn't the larger number indicate that the ratio is longer rather than shorter? 1st gear for M2B4 = 3.307 versus the M2Y4 = 3.285.

Shorter ratios should quickly bring your RPMs up versus longer rations should slowly bring your RPMs up. Or am I thinking about this wrong?

On a different note, I drove Keith's new transmission and it feels wonderful. Much better than his old one. Shifts are smoother than my SH tranny. I don't know. It just feels different. Didn't get to test out the LSD wen I drove it though. Maybe next time.

Daemione · 04-06-2006, 03:57 PM

The higher the number, the tighter/shorter the gear.

liquidxnitez · 04-06-2006, 03:59 PM

Quote:

Originally Posted by Daemione

The higher the number, the tighter/shorter the gear.

Oohh....thanks for the clarification Dave.

Daemione · 04-06-2006, 04:04 PM

And if it helps - think of it as a ratio . . . a 3.307 gear is actually a 3.307:1 gear. So the higher the number of the gear, the higher the ratio. So more revolutions needed for each turn of the output shaft, and more mechanical advantage (read: torque).

liquidxnitez · 04-06-2006, 04:08 PM

My MechEng education is hibernating. hhaha

lilredlude · 04-06-2006, 05:55 PM

can't wait to try it out

KENLUDE97 · 04-06-2006, 06:40 PM

I've had a M2B4 for 3 years and i LOVE it. Its hard not to when you pay for a SC Pully for a GTP to a friend and the labor to swap the trannys!

But it does make Auto-x MUCH more fun

Enjoy your LSD. Watch your 5th gear syncros.... I just

replaced mine... FYI the USDM 4th gen parts fit/work.

The Oreo · 04-07-2006, 07:39 AM

Quote:

Originally Posted by Daemione

Sounds pretty sweet, Keith . . . what's the name of the place you got it? They have a site?

And if you don't mind - how much did you pay?

I payed 950 for it.. It was worth 1100 though.. it's only because my mech knows the guy's son that owns the place.. It's a warehouse in patterson NJ.. I have to figure out the name of it..

I just drove out there, drooled over all the engines and parts, sat in an S14 silvia.. And brought my tranny to the shop in the same day

Solid · 04-09-2006, 01:58 PM

My M2Y4 cost me about $750

, but I have no LSD!

2point6 · 04-09-2006, 02:47 PM

I think you have a mistake in the 4th gear ratios listed for the M2A4 and M2B4. It should be 1.034. My information is from teardown.
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ThatPreludeGuy · 05-13-2006, 03:33 PM

Mine is in now as well and coming from my beat clutch SH trans its like butter! I had an Exedy Oraganic Street setup with a Clutchmasters lightened flywheel and braided clutch line installed at the smae time. The combo feels PERFECT for the car!

JaXx4k · 05-23-2006, 12:35 PM

i bought mine before all the hype for $700 n sold it a yr later for 980 shipped

it was no good for boost.. lolz

Kap TypeSH · 05-24-2006, 07:15 AM

Jackie, how is your AP1 free? you mean like free & clear as in no liens, no encumberances? Or as in free since you traded for it and put no $$ out of pocket?