RX-8 Driveshaft compared to RX-7 FD Driveshaft
#1
Newbie
Thread Starter
RX-8 Driveshaft compared to RX-7 FD Driveshaft
This is my first post on a forum so I hope I did not mess something up.
I am currently planning to fit a 5-Speed transmission from an RX-8 with the 192hp into my FD because it is a lot cheaper to get here in Austria than a good used RX-7 transmission.
The facts that I have already found is that you can use the bell housing and the tail shaft housing of the FD transmission and bolt it right onto the RX-8 transmission.
This way, you maintain the pull type clutch and the original shifter location of the FD. Also the gearing is very similar to the original FD transmission.
Now to my question: Before I buy the used RX-8 Transmission I want to make sure that the output shaft of the transmission fits onto the FDs Driveshaft.
I found this picture of the RX-8 driveshaft where I can count 25 valleys and 23 splines. But i did not find the outer diameter or other dimensions of the yoke.
RX-8 Driveshaft Splines
If anyone that has a RX-8 and a RX-7 FD driveshaft/propellorshaft lying around and could measure me the outer diameter and confirm the number of splines I would be very thankful.
Thanks to everyone!
I am currently planning to fit a 5-Speed transmission from an RX-8 with the 192hp into my FD because it is a lot cheaper to get here in Austria than a good used RX-7 transmission.
The facts that I have already found is that you can use the bell housing and the tail shaft housing of the FD transmission and bolt it right onto the RX-8 transmission.
This way, you maintain the pull type clutch and the original shifter location of the FD. Also the gearing is very similar to the original FD transmission.
Now to my question: Before I buy the used RX-8 Transmission I want to make sure that the output shaft of the transmission fits onto the FDs Driveshaft.
I found this picture of the RX-8 driveshaft where I can count 25 valleys and 23 splines. But i did not find the outer diameter or other dimensions of the yoke.
RX-8 Driveshaft Splines
If anyone that has a RX-8 and a RX-7 FD driveshaft/propellorshaft lying around and could measure me the outer diameter and confirm the number of splines I would be very thankful.
Thanks to everyone!
#2
Rotary Freak
Only 6 speed rx8s were sold here. Measured the OD and spline count on both for someone on here in the last year or two and they were identical.
Import rx8 5 speeds have been sold here for a few years as FD boxes once the extension housing and bellhousing were swapped....so I think you're safe. If really paranoid, I'd just get the part number for the 5 and 6 speed tailshaft and see if there's any difference?
Import rx8 5 speeds have been sold here for a few years as FD boxes once the extension housing and bellhousing were swapped....so I think you're safe. If really paranoid, I'd just get the part number for the 5 and 6 speed tailshaft and see if there's any difference?
#4
RX-7 Bad Ass
iTrader: (55)
^Yep, I personally know 2 people who have done the swap with a JDM 5-speed and it was just change the bell housing and tail housing and bolt up from what I understand.
Dale
Dale
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Lukri112 (04-14-22)
#5
Junior Member
Yup also common for rx8 REW swap builders to buy an rx7 trans and swap the tail end and bell housing for it to work.
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Lukri112 (04-14-22)
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#9
Newbie
Thread Starter
And because that is the case, I can use the RX-8 5 Speed Manual Transmission in an FD with the bellhousing and tail of the original FD Transmission.
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Neo (04-24-22)
#10
10000 RPM Lane
iTrader: (2)
the only thing to be aware of is that while the RX8 5-spd has additional cone synchros it’s been reported that they made the gears narrower width to accommodate them.
in theory those gears might be weaker, the particular Rx8 Renesis engine used with it was only rated 192 bhp.
.
in theory those gears might be weaker, the particular Rx8 Renesis engine used with it was only rated 192 bhp.
.
#11
RX-7 Bad Ass
iTrader: (55)
I think for any car seeing less than 400hp the RX-8 5-speed will be fine. The FD gearbox holds a LOT of power, I've seen 500+ on it. The fact the RX-8 gearbox is newer and most likely built with better materials than the original gearbox from the earlier 90's probably helps too.
Dale
Dale
#12
Senior Member
iTrader: (1)
I think for any car seeing less than 400hp the RX-8 5-speed will be fine. The FD gearbox holds a LOT of power, I've seen 500+ on it. The fact the RX-8 gearbox is newer and most likely built with better materials than the original gearbox from the earlier 90's probably helps too.
Dale
Dale
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