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Thread: Transmission Compatability
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sparky
Redlining
Posts: 299
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posted January 26, 2006 07:02 PM |
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Transmission Compatability
My tranny is almost gone. I was wonering....Will any 1st gen rx-7 tranny bolt up and work with the repu engine and flywheel?
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'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition
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Tom93R1
Redlining
Posts: 458
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posted January 27, 2006 08:27 AM |
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Any Mazda rotary tranny just about will bolt up. The difficult part is shifter location and tranny mounts. From what I have heard the 1st Gen rx7 from 79-80 are the easiest to fit with the least custom work.
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'74 lawn-green
4-port 13b
Weber 48DCO
Racing Beat Header
Magnaflow
resonator/amplifier
really loud!
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Brad
Rotorhead
Posts: 1672
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posted January 27, 2006 09:34 AM |
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quote:
Any Mazda rotary tranny just about will bolt up. The difficult part is shifter location and tranny mounts. From what I have heard the 1st Gen rx7 from 79-80 are the easiest to fit with the least custom work.
I had a 79-80 5 speed in mine. All that was needed to fit was a simple adaptor plate for tranny mount to tranny crossmember. Because they do not line up by about 4". 1/4" thick steel with 4 holes did the trick. Besides that no issues with bellhousing, input shaft, trans length, or output shaft. Bolted right up with that plate.
This is the best and simple-ist way to go, plus it's a 5 speed for increased MPG and parts are more readily available than with the ribcase.
If you want a semi-close ratio gearset then you can put 79-82 626 or miata 5 speed internals in a 1st gen case. Love Mazda compatibility.
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-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge
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RotaryRob
Revvin Up
Posts: 53
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posted January 27, 2006 09:54 AM |
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Brad is right-on with his comments. Also, if you can find one, a rib-case 5-speed from an Rx4 or Cosmo will work with the same modification to the cross member. These are the strongest of the older boxes. The Rx4 box will give you the lower 5th gear ratio (It seems like it's .862:1); while the Cosmo box will give you the higher ratio of like .735:1... don't remember exactly. The Cosmo box is ideal if you are still running the 4:62 rear gear and want to get some highway capability. If you are looking for the close ration setup you can use the 626 box he described, but you don't have to change out the entire gear set. You can modify the input shaft (spline shortening is required)and just slap on an Rx7 bell housing and tailshaft housing and shift rods from a '78 to '80 Rx7 and you're good. If you really want some torque, you can do a similar mod as the 626 box to a B2000 box and get a lower first and second gear. Be careful, however, about mixing Rx7, 626, & B2000 and rib-case shift levers and towers. The rib-case units have a taller tower and longer distance between the swivel and actuating balls.
Good luck
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'77 RPU
'75 RPU (V-6)
'76 Courier
Rotary Sprite (3 - 2 project)
'85 IT 7
EP '85 Rx7 (in progress)
'85 GSLSE (4)
C6 Corvette Roadster
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sparky
Redlining
Posts: 299
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posted January 27, 2006 10:18 AM |
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I,m just trying to be cheap right now. I eventually would like to get a T-2 tranny and the 3rd gen RX-7 lsd rear end in the truck. I dont have time or money to upgrade now. I was hoping to make a 81-85 rxy tanny work beacause they are cheap and alot of them around. Has anyony made one work in a REPU before?
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'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition
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mwpayne1
Redlining
Posts: 239
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posted February 28, 2007 03:56 PM |
 Edited By: mwpayne1 on 28 Feb 2007 15:57 |
Bringing back this ol' thread, because I believe my 4 speed is on it's last legs. Third gear is LOUD, sounds like a semi coming down the road.
Love to throw a 84-85 5 speed in there. What do I look out for?
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sparky
Redlining
Posts: 299
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posted February 28, 2007 04:10 PM |
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I ended up installing a 5-spd from a 83 rx-7...Thanks for the tranny Max. I made a modification to the shifter location so I wouldn't have to cut on the cab. I removed the tail housing and shortened the linkage rod for the shifter about and inch. Then I changed the shifter mount...reversed the shifter mounting bracket. The mod worked out great. Later I plan to do the same thing on a T-2 tranny. Make sure you verify spline size on tranny input shaft. I had to go with a different clutch disc. Good luck.
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'77 REPU
Stock 6-port
T-2 tranny
Weber IDA 48
Alum Flywheel
3rd gen Torsen in rear end.
DLDFIS ignition
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Draggin_2600i
Redlining
Posts: 235
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posted April 12, 2007 10:27 PM |
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t2 tranny
I just made a thread about t2 tranny compatibility with a b2600i tranny.. that would definately help with the shifter location..
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