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NA6C 5 speed to 6 speed coversion

2K views 15 replies 12 participants last post by  Brownie 
#1 ·
Just a random thought,Has any one tried a 6 speed gearbox from a NB on a early 1600 5 speed car?

I,ve looked at them at work and reckon they are a damn near straight conversion with minor bits like Clutch and Flywheel etc needing doing,But they are the same length overall.
I have sold NB 1600cc boxes to go onto NA Turbo's and have been told they feel real good and no issues changing them over.
Anybody tried and found any pitfalls?,or is it as easy as it looks?
 
#2 ·
it works. its been done many times you dont have to change the clutch and flywheel. i think you end up only using 2 or the 3 bolts for the starter. you have to change sensors over. the shifter is different as well. maybe someone who has done the swap can chime in on this.
 
#6 ·
If I am not mistaken a 6 speed combined with the ring gear in a 1.6L is going to be the same final gear as a five speed with the ring gear in a 1.6L The cars came with different ring gears as the diff changed and the gears in the transmission were selected around that ring gear, so I would check that out cause you could lose top speed if the gearing gets too out of whack.
 
#10 ·
LOL build a miata that can go almost 400MPH:
-build motor that can rev to 9999RPM
-use 275/75-18 tires
-quaife WIDE ratio trans
-3.23 rear end

LOL Please someone do this
 
#14 ·
Hahahaha Bonneville car much. What about that hartley V8 doesnt it wind out to something stupid like that or even a rotary engine would be able to crank out the revs but will it have enough power to move the car!

A 6 speed with some 3.23 gears would be nice for the highway, I really hate cruising at 120km/h in fifth doing 4K revs (probably not accurate but you 5speed guys know what I am talking about)
 
#12 ·
Someday, I'd like to put a 3.636 rear end with a 6 speed into my Miata. Basically it'd be like having a regular 5 speed, only with a really nice 6-gear overdrive for freeway cruising at ~3000rpm.
 
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