Thread: trans ??

I know this wasn't the topic of this thread, but I thought I'd help N2Boost out with these pictures.

This is the 5th gear followed by the brass synchro and then the selector ring/collar. (From bottom to top).


Here is the stack again as they sit in the transmission.


Here is what it looks like with the selector ring/collar disengaged. My hand doing the job of the shift fork.


This is what it looks like with 5th gear engaged.


Here's what it looks like with the selector lifted off.


And with the synchro removed.


All three pieces separated.


This is the two main pieces of the selector ring/collar and inner spline assembly. Normally two ring springs and three retainers hold it together and allow them to slide up and down a bit separately.

Here they are together. The three open spots are where the three retainers go.


Here are the dog teeth on the selector ring/collar that have been torn up causing 5th gear pop-out.


Here they are again. Torn up. Chipped teeth.


More carnage.


Here is what the other side looks like that hasn't seen any use in it's life. This is what it should look like more or less.


More pics of the good stuff.


Here are the dog teeth on the 5th gear itself all torn up causing 5th gear pop-out.


Another picture of the beat up dog teeth. You should see now that with all this material gone the teeth don't have much left to hold onto.


Here is my brother's 5th gear that we replaced ahead of time before it could get 5th gear pop-out. It looks a lot better.


Again.


Good one on the left, bad on the right.


Here is the bad one again. You'll notice the distance between the gear teeth and the dog teeth is very small. Maybe 1mm at most.


The redesigned gear will have 2mm or 3mm between the gear teeth and the dog teeth. Basically they sit up higher. This means they penetrate deeper into the selector ring/collar and do not loose contact and slip or grind themselves up. Take a look back at the picture showing both gears next to each other. You'll see neither is the redesigned gear even though they both came out of 1994 transmissions.

If you have the gear with the "taller" dog teeth you're all set. Otherwise it's a time bomb. You'll know when you take it apart.

there is a Nismo lsd that you can buy for the non-LSD transmissions

Brent

Thanks Ben Fenner, I understand, but in the first pic with the case off and all the gears are stil intact, where exactly is 5th gear?



isn't that like $1000? that is way too much to be putting into a $200 to $300 tranny

I guess when I said it was in the top/right corner that wasn't clear enough. Here it is in purple.

Good Stuff BenFenner

Thanks Dre. I'm going to turn all this into a How-To for 5th gear pop-out so a mod can clear up this giant thread jacking. Give me a bit.

Edit: Well I guess the OP asked about spotting 5th gear pop-out by inspecting the inside of the transmission. Not a total thread jack. I'll report my posts when they're ready to be deleted.

sorry, I missed where you said it was at the top right, but the pruple really did help

thanks for all the help.. so if i were to just get new 5th gear stuff it might not fix it..

If the transmission has the redesigned 5th gear and you keep good motor mounts I don't think you should have anything to worry about. If the transmission has the old style 5th gear then you're looking at 5th gear pop-out in your future unless you replace it with the new style part.

Others disagree with me, Shawn B being the most vocal. He's had personal experience with 5th gear pop-out repairs done by shops twice (maybe three times?) and isn't convinced the new part solves the problem.

I'm not convinced he got the new part.

I agree. I don't think he got the new part.