99 trans in a 95? With modification? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-24-2008, 12:58 PM   #1
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Default 99 trans in a 95? With modification?

As some of you know, I need a new transmission. I found a 99 5 speed with 60k miles. I was wondering if the 99's will bolt up to a 95' without any problems/ modifications? Bolt up just as easy as a 95 transmission would. Thanks in advance guys.

Doug
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Old 09-24-2008, 01:07 PM   #2
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IF you go with the NB trans (sans shifter), be sure to check your 95 shifter for the rear slot on the fulcrum ball. If it doesn't have one (I don't think it does) you'll want to press out that rear pin in the turret with some channel locks or a c-clamp BEFORE installing.
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Old 09-24-2008, 01:10 PM   #3
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I drove a 93 with an NB tranny. very naws.
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Old 09-24-2008, 07:48 PM   #4
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So I wouldn't have any problems putting in a NB tranny? Also I have an aftermarket ebay short shifter.
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Old 09-24-2008, 09:33 PM   #5
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That pin I mentioned will probably need to be pressed back to work with the short shifter.
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Old 09-24-2008, 11:32 PM   #6
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That pin I mentioned will probably need to be pressed back to work with the short shifter.
Yea? You think that would be the only issue? It would bolt up to it just fine? Speedo cable?
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Old 09-24-2008, 11:41 PM   #7
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Yes- bring over your gear and cover from the NA trans for the speedo cable. AAMOF I'd bring over your switches too since you know (IF) they were working on the other trans. You might test them once installed in the trans with a meter to make sure they're working, rather than find out after the trans is installed like me.
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Old 09-25-2008, 12:12 AM   #8
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Yes- bring over your gear and cover from the NA trans for the speedo cable. AAMOF I'd bring over your switches too since you know (IF) they were working on the other trans. You might test them once installed in the trans with a meter to make sure they're working, rather than find out after the trans is installed like me.
Thanks a lot. I really appreciate your help.
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Old 09-26-2008, 02:24 PM   #9
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Ok. I don't get this, but NA neutral switch won't work in the NB trans. I moved my working switch over from a 91 trans and got no signal. Tried another NA switch and no signal. Plugged in the NB switch and it works fine. Haven't put a meter on it, but I'd say use the NB switch, just verify continuity through the switch when depressed first.
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Old 09-26-2008, 03:18 PM   #10
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It's basically all the same ****... I just put a 1990 5 spd trans into an 01 car that came with a 6 spd. Had to hardwire the nuetral and reverse switches.

Use the shifter that came with that year trans. Makes life easy.
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Old 09-26-2008, 03:25 PM   #11
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I don't have a 99 shifter- it went with the race car and the spare trans Mazda gave us didn't have a shifter. So it was either buy one for $30 or press the pin back to accommodate the NA shifter.

As far as the switches, I hear ya, but I just spent an hour out there screwing around with them and the neutral switch that was working in my 91 would not give a neutral signal in the 99 trans. Neither would the other NA neutral switch I have. The original switch would (didn't want to use it because the wires were chewed up). So it's now patched up and installed- working.

There is a physical difference between the NA and NB neutral switches- the ball in the NB is about half the size of the NA.
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Old 09-26-2008, 03:34 PM   #12
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Rob--I wasn't really directing that at you, sorry if you felt I was gettin' snotty with ya.
I have nothing negative to contridictory to say about your methods and practices. I'm pretty sure there's lots I can learn from you still, and less so the other way around.
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Old 09-26-2008, 04:00 PM   #13
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No- I was just trying to clarify my situation...elaborate on it for the sake of thread. I totally agree with the recommendation to use all the stuff that comes with the trans. Just check the switches prior to installing because the neutral switch is a bitch to get out once the trans is in. I actually made an SST with one of my sockets (a la O2 sensor socket) to get in there over the switch and remove it with a stubby rachet. Yet another "modified" tool.
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Old 10-02-2008, 04:41 PM   #14
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Ok guys, I'm going to pick up the tranny today and most likely won't be able to do the swap until Sunday. Any other last minutes tips? Also, thanks for all the help and advice so far guys!

Doug
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Old 10-02-2008, 04:58 PM   #15
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drain the oil before removal and install ;-) turret has a drain too, if you're not equipped with another means...
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Old 10-03-2008, 01:12 PM   #16
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Thanks ALOT guys for all the help and advice! I won't be able to do anything to the car until this Sunday... or possibly or even later. I'll keep yall posted.

Doug
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