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Index > Engine/Drivetrain > Thread: 79 rx7 tranny in a 75 repu?
Thread: 79 rx7 tranny in a 75 repu?
BadAssRX-7


1st Gear
Posts: 49
posted November 15, 2002 07:36 AM

79 rx7 tranny in a 75 repu?

will a 79 rx7 tranny fit in a repu... it will be a 5 speed. im wondering what all i will need to swap... starter? flywheel? change the input part of the driveshaft? is the 79 tranny longer? will the shifter fit and lineup?
____________
83 limited edition rx7...T2 SWAP ON HOLD, 89 vert d.d., 74 rusted repu with 6port & Dellorto, 05 ZZR600

       
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repuguru


Redlining
Posts: 319
posted November 15, 2002 03:53 PM

Like a glove. The 79-80's are the only rx7 tranny that don't require cutting the tunnel or changing the tail shaft to shorten it up.
The only thing you may encounter is the location of the tranny crossmember mount may have to be modified.
Did you get the bumper on yet?

       
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BadAssRX-7


1st Gear
Posts: 49
posted November 15, 2002 07:16 PM

well becuse of the bent i did in the back i cant get the bumper on and its HARD metal ther i already teried to get a wench and pull it out but i didnt even fase it
____________
83 limited edition rx7...T2 SWAP ON HOLD, 89 vert d.d., 74 rusted repu with 6port & Dellorto, 05 ZZR600

       
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roaddancer


Hauling
Posts: 127
posted November 21, 2002 08:23 PM

You can make an offset plate to allow you to bolt the transmission to the stock crossmember. No relocating/drilling of mounting holes. I made one for my '74, and never had any trouble. I have a sketch that I could scan and send to you and/or the web master. Not great art, but useable. Would need a few minutes in a basic machine shop. The original drawing has been tucked into a Racing Beat catalog in my toolbox at work for 18 yrs. Just couldn't part with it!
____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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Jeff20B


Moderator
Posts: 661
posted November 22, 2002 11:33 AM

I've got an unmolested '74 crossmember and another that I've slotted to fit a '79 tranny.

Hey Badass, how's yours going?
____________
'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7

       
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BadAssRX-7


1st Gear
Posts: 49
posted November 22, 2002 10:24 PM

yea shoot me a scan of the plate that would give me a starting point.send it to BadAssRX-7@excite.com
This isnt MY truck its a friends and im using it and REALLY hate the 4 speed.im trying to talk him into letting me do the swap...4 free even i have the 79 tranny already. and its not like the truck is a show winner...its got cancer but its a TRUCK.
____________
83 limited edition rx7...T2 SWAP ON HOLD, 89 vert d.d., 74 rusted repu with 6port & Dellorto, 05 ZZR600

       
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rtrypwr


Hauling
Posts: 115
posted November 22, 2002 10:39 PM

tranny mount

i welded a 1/4 inch think extension on to the stock mount,re drilled the 2 holes for the tranny. then spaced the mount to the body a 1/4 inch .

       
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roaddancer


Hauling
Posts: 127
posted November 25, 2002 08:15 PM

Here's a URL that has the adapter plate sketch.
http://www.yamhillfun.com/rxadaptx.html
Not fine art, but useable.

       
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Peritrochoid


1st Gear
Posts: 44
posted April 11, 2004 12:59 AM

Hey, does anyone still have this "adapter plate sketch?" I need to do this to my '75 REPU as I've temporarily redrilled the stock upper mount to fit but I don't like the way it sits. It's either make this plate, modify the crossmember, or get a new crossmember made.

Anyone have a spare crossmember?

Thanks,
Mike
____________
1971 R-100
1973 RX-2 coupe - too much to list -
1973 RX-2 sedan - project "infestation"
1975 REPU - big port 13B, race header, straight exhaust, RB "flying saucer" intake -
1983 GSL - streetported 12A, race header, dual straight exhaust -
1993 FD - project "crispy"

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brad


Rotorhead
Posts: 1672
posted April 12, 2004 02:00 PM

quote:
Hey, does anyone still have this "adapter plate sketch?" I need to do this to my '75 REPU as I've temporarily redrilled the stock upper mount to fit but I don't like the way it sits. It's either make this plate, modify the crossmember, or get a new crossmember made.

Anyone have a spare crossmember?

Thanks,
Mike


My repu came with a 79-80 5 speed and the aforementioned plate. I'll scan the pics I took, but in a nutshell:

The 5 speed tranny mount sits about 2" forward of the repu trans crossmember. So make a metal plate, about 3/16" to 1/4" thick, about 3" long and a little wider than the trans mount. Drill four holes, two for the trans mount, two for the crossmember.
____________
-brad-
74 REPU Lawn Green
81 Rx-7 racecar. 12a J-
Bridge

       
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roaddancer


Hauling
Posts: 127
posted May 07, 2004 08:36 PM

I still have my original sketch somewhere, and the scan of it is in one of the two computers I have. (probably the non-cooperative one!) The problem I had was that my scanner made the file too large for email. The link I posted is to a website I no longer operate. If I get around to building my free webpage, I will embed it there.
____________
formerly
rx2/3/4/cosmo,repu,94 rx7,

       
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cappella


1st Gear
Posts: 13
posted May 09, 2004 07:12 PM

I uploaded the Adapter Plate sketch to the Gallery... I guess being a pack rat pays off.

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roaddancer


Hauling
Posts: 127
posted August 14, 2004 05:09 PM

In converting my 75 to a manual from an '80 Rx7, I found that the plate I made from my original drawing was not even close. May be some variations out there, or the auto crossmember is different? Not sure. Made it work anyway. If I were to do it over, I would drill as required, rather than slotting. Problem I had included the offset too close to the original mount. I probably could have slotted the crossmember enough on this one. On my 74, no way! I had wondered about others saying they were able to slot the crossmember enough. Perhaps some variations in alignment at the front engine mounts? Not sure why some yes and some no.

Best advise is set it up and measure first.

       
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