jcharron121

i have a 1989 prelude si and was wondering if a 1990 tranny would fit in it.

BergRacing21

Yes, 1988-1991 are all compatible.

jcharron121

are u positive i have this guy at salvage yard saying 88-89 are only ones that would fit. i almost lost out 300$. thank you

BergRacing21

i mean they all came with B20's so pretty much any B-series tranny will fit. Just the gearing will be different.

jcharron121

ok thanks. the guy had it charged to my visa and then called back saying they had the tag wrong and its a 90 prelude tranny and was like i looked in the book only 88-89 fit thats it

BergRacing21

that's weird, maybe cause they hadn't come out with the 90-91 models yet? but even those had B21's which is still a B-series motor. So those trannys work.

98ekb16

If its a 5 speed then the 90/91 tranny will work in the 89, you just need to change out the clutch disc to one from the 90/91 and possibly the intermediate shaft. Also you need to keep the speed sensor from the 89 tranny, it went to an electronic sensor in 90. Some of the 90/91s had better gearing than the 88/89. Keep in mind if you want to get a clutch kit, the pressure plate also changed from 89 to 90, you need to change the flywheel to use a 90 pressure plate. I'd save some money and just buy the clutch disc for a 90 if your pressure plate is good.

The only trannys that will work will be from the 88-91 preludes. No other tranny will fit. These are the bastard b series, there is almost nothing interchangeable between them and the civic/integra b series. The preludes are cable shift trannys and are designed to sit at more of an angle to match the engine.

jcharron121

i need a new clutch anyway . should i just get the whole kit for the 90?

jcharron121

or could i just get the 89 clutch and it still work

gc8dc95

You have to have the corresponding flywheel/clutch combo.

88-89 trans = 88-89 Clutch and Flywheel (Has Mechanical VSS)
90-91 trans = 90-91 Clutch and Flywheel (Has Electronic VSS)

That is why they are not listed as a direct swap.

BergRacing21

WOW! super brain fart...you are absolutely right bro. haha i don't know how i forgot that. I guess im just so use to answering simple questions.

1funryd

What Cory said here.

And please do not confuse the B20a5/B21a1 series motors with anything civic/integra/CRV related because they are not at all.

88-91 Preludes have unique parts. There are some parts that can be made to fit, but very little and you better do your research before buying anything for the 3rd gen Prelude.

And to the OP, please go to www.p r e l u d e p r e l u d e p o w e r.com(no spaces) and register there for complete aftermarket and OEM support for the 3rd gens, because you will not get accurate information for our chassis on honda-tech.

Its the biggest and highly trafficed forum for 3rd gens on the planet, and thats not an exaggeration, see you there.

3gpreludetuner

Lol. Yup What 1funryd said. Lol.

mikechilds13

i have a love/ hate relationship with my 1990 prelude =-) it acts good for a couple weeks then blows up and just like everyone said the b20a5 isnt really compatable to anything

1funryd

Well when you get tired of the B20a5, then come talk to me about swapping the H22 in.

mikechilds13

lol im just looking for a block for mine right now and im gettin a 1997 prelude sh with the h22 in it so im not going to swap that lol but i got a 200 civic id love to put a b16 or b18 in

LagunaGold

1funryd

Does not matter anyways, because the H22 SH version will not fit into the 3rd gen chassis do to the ATTS.

Your best bet will be to hit up prelude power forum in the for sale section to purchase from a member there or hit up the junkyards and try your luck.

mikechilds13

nah i dont plan on swapping the h22 but dude sold it anyways im really lookin into a del sol now but i need a b20a block for my car