Like the topic says:

Would it be possible to bolt up a 4th gen tranny to a 97 SH (h22a4)?

It is an SH, so does anyone know If it would interfere w/ATTS??

The reason I'm doing this, is because I'm setting my car up for autox.
I have a feeling, if I get serious into this Im going to ruin a tranny.

Also the 4th gen Vtec is geared lower, this would give me better acceleration out of the corners. I love my top end, but honestly when am I going to be doing 150 in an autox course.

I know you can bolt up 5th gen tranny to a 4th gen, but unsure about this swap. Especially when my car is an SH.

Thanks for any info

 

bump..

 

anyone?? any clue?

 

The 4th gen transmission will not work on an SH. The TypeSH block is unique. Neither a 4th or 5th gen Base transmission will mate to it.

Andrew

 

thanks man...damn down w/tranny too.

 

thats what i hear, but i find it hard to beleave, it would cost honda too much extra money to have to have to different h22's being produced at the same time, it doesn't make sense...but that doent mean they didn't do it...if u want to see if it works take a sh tranny and put it next to a base model or 4th gen and see the mount pattern...you will lose atts, its part of the tranny system

 

Dude, it does NOT work. People have already tried this. The bell housing is different between the Base and SH tranny. And the intermediate shaft is the wrong length and will not line up correctly with the block.

Andrew

 

Also, the tranny swap would put your car in DSP or Street Mod - both classes where the Prelude would require A LOT of money in it to be competitive. On top of that, the gearing would not really help you on an autoX course. Basically, the only gear you use in autoX is 2nd. If anything, I'd say the marginally taller gearing of the 5th gen is better for most autoX courses. The 4th gen tops out at like 60mph in 2nd gear, while the 5th gen is good for about 65 in 2nd.

If you want shorter gearing for autoX, run a smaller diameter wheel/tire combo to increase your final drive ratio. That way, you can still be eligable for STX or even D stock. I run 215/45/16s and the difference in gearing is noticable.

Andrew

 

Well, it has been done, so saying it's impossible is a little misleading, but it does require a good amount of custom fabrication. It's not something you would do at home and it's all up to you whether it's "worth it" or not.

 

A 4th gen tranny WILL bolt up to an SH block! Where you're going to run into trouble is with the intermediate shaft.....ATTS has 2 holes on the SH block, normal has 3 for the intermediate shaft, so you need to custom make a bracket for the shaft to bolt up to the SH block.....we just ran into this problem while swapping an H22 into an accord....it was a built motor with an A4 block from an SH and the rest of the stuff (head/intake manifold) from an A1.....
Brian

 

exactly what he said. the tranny will bolt up, but you will have trouble with the int. shaft. if this was impossible my car wouldn't be driving right now.

 

Actually, you're wrong. I know for a fact that the base model tranny bolts up, cause thats how my car is now. I have an SH motor with my base model tranny bolted up. I hydrolocked my first motor, but the tranny was still good, so I used it. Base models and SH's have the same exact motor block. The only thing different is how the oil filter sits. The SH's sit upward, the base model sits flat

 

NO! Base and SH models have DIFFERENT holes in the block where the intermediate shaft (base) or atts (SH) bolts up. The base tranny WILL bolt up to the SH block no problem, but you will need to custom make an intermediate shaft bracket and use the base model intermediate shaft, and it is a pain in the a$$
Brian

 

I already know that. Luckly I have a friend whos dad knows how to weld pretty good, so he made me a bracket for my intermediate shaft to stay in place. I just wasn't talking about the axle itself, I was just talking about the motor itself. Both are H22a4 motors, thats why I said both cars have the same kinda block


[Modified by prelude1897, 9:24 PM 11/3/2002]

 

Ok, so I kinda get the feeling, it's sort of a hit and miss subject. You either need a custome bracket "of sorts" or it won't work. So what would keep you from putting the gears from a 4th gen tranny into the 5th gen SH tranny. Then I believe you could keep the ATTS, since it will be great for Auto Xing. Don't know if it would work, but don't see why it wouldn't.

 

I don't see why the 4th Gen. Prelude tranny won't fit properly. I mean, you probably need to change a few things since you're be using an OBDI tranny on an OBDII motor. Its never hurts to try new things, cause thats part of racing, just by finding new a different things to work together. You may discover a pretty bad *** setup when you do this.

 

What? OBD has nothing to do with trannies! What are you talking about?

You would have the same problem you described above, it would have to be modified for the intermediate shaft, The 4th gen tranny bolts right up to a base block no problems

 

I just figured since the gearing is different between both trannies, that would somehow have an affect with it. I know that the tranny would bolt up, just didn't know if the OBD would effect it's performance and have it work properly. Thats what this board is for though, just to correct and help others.

 

Yeah there are no issues with emissions control and swapping trannies

For reference, the 96 VTEC is an OBDII car with a 4th gen tranny.

 

Any conflicts with the VSS between generations?

 

YES

I don't believe it's generation specific but from what I know there is a VSS with a big gear, and a VSS with a small gear within the M2F4 trannies.

I figured that out after spending an hour trying to ram a VSS into a hole that was too small! These were both 4th gen M2F4 trannies too which is why we were dumbfounded. Then we walked over to the other car and looked at the VSS and noticed the gear was super small. It was bizarre.