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Index > Engine/Drivetrain > Thread: Help identifing transmission
Thread: Help identifing transmission
datsunrides


Revvin Up
Posts: 58
posted December 21, 2007 05:03 PM

Help identifing transmission

I just bought a supposed 5 speed trans from a 79' rx7 from the local wreckers. I have a bad feeling this is a 4 speed but since the shifter is missing I am having diffuculty determining which I have. Is there a way to determine what I have without opening it up? I tried shifting with a screwdriver but I am not confident in what I think it is.

Thanks, Mark

       
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Klaus44


Redlining
Posts: 365
posted December 21, 2007 06:29 PM
Edited By: Klaus44 on 21 Dec 2007 18:32

Unless I'm mistaken...

...I don't believe there were any 4-speed manuals offered on the 1st-gen seven... (?) ... so, I think you're probably OK.

Drain it, and see how bad what comes out looks. If it still appears serviceable, fill it with AMsOil full synth gear lube, and put in a new rear seal, and run it... and see what you got. If it's 'iffy', you may actually find that it will improve somewhat after running it with the AmSoil for a while.

       
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Mazdarx605


Redlining
Posts: 314
posted December 21, 2007 09:23 PM

Klaus,

There were indeed 4 -speed trannys in the first gens. I know at least the early 79-80 models had 4 speeds as the base tranny for the S model cars. If you bought a GS(like my 79) then you had the 5 speed,but a base S model got the 4 speed. I am sorry though I am not sure how to tell them apart,aside from putting a shifter into the hole,and rowing through the gears.

Chris
74 REPU
79 RX-7 GS

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Klaus44


Redlining
Posts: 365
posted December 23, 2007 12:46 PM

...So much...

...for my transmission/gear ratio/rearend chart being *complete*. Must mean the 4 speeds were really 'popular'...?

       
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datsunrides


Revvin Up
Posts: 58
posted December 23, 2007 02:32 PM

Are the 79'/80' 5 speeds considered what Datsunfolk call doglegs? That is, reverse is where 1st would normally be and 1st is where 2nd would be? When I go to the left and up (as sitting behind the wheel)that is where reverse is. My confusion stems from the fact the tag on the trans says 5 speed and the trans has 4 speed written on it in paint pen.

Mark

       
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Klaus44


Redlining
Posts: 365
posted December 23, 2007 03:12 PM

Nope, they're not 'doglegs'.

I'd invest in a shifter to attach to that trans., however temporarily, to prove once and for all what it is.

       
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datsunrides


Revvin Up
Posts: 58
posted December 24, 2007 03:35 PM

It's a frickin' 4 speed. Darn! I may still install it if they refund my money and sell it back to me cheap. The guy at the yard said it was sitting on the shelf for over 10 years!

Mark

       
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datsunrides


Revvin Up
Posts: 58
posted March 10, 2008 07:51 PM

Picked up a 80' RX7 5 speed (no question about it!) this weekend and have it swapped in mostly (waiting for the mount adapter) My question is regarding the hole to check the timing that's in the 4 speed but not in the 5 speed. Is this the only way to check the timing? If so, I assume I will need to cut a hole in the new trans. I would have done it prior to the install but the new 5 speed has a 30 warranty and I just want to get it hooked up and make sure it's in good nick. I can pull it out later if needed, pretty easy to remove.

Mark

       
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Rotorranch


Newbie
Rotary Power !!!!
Posts: 8
posted March 10, 2008 08:57 PM
Edited By: Rotorranch on 10 Mar 2008 20:58

quote:
Picked up a 80' RX7 5 speed (no question about it!) this weekend and have it swapped in mostly (waiting for the mount adapter) My question is regarding the hole to check the timing that's in the 4 speed but not in the 5 speed. Is this the only way to check the timing? If so, I assume I will need to cut a hole in the new trans. I would have done it prior to the install but the new 5 speed has a 30 warranty and I just want to get it hooked up and make sure it's in good nick. I can pull it out later if needed, pretty easy to remove.

Mark


You check the timing from the front pulley.

Rotor
____________
Rotor Ranch Racing
Fayetteville, GA

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datsunrides


Revvin Up
Posts: 58
posted March 13, 2008 07:28 PM

So, any importance to the hole? Also, I tried to bolt the REPU shifter into the RX7 trans and it binds up. The REPU shifter seems to be a little longer below the pivot than the RX7 one. Is the 4 speed REPU shifter "tower" a little taller than the RX7 one? If so, I guess I need to swap it out since the RX7 shifter almost hits the seat and is a bit on the low side.

Mark

       
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