2nd to 3rd "crunch".....

[MetalSpikeRacing]

Hey guys, I have reading for a bit on this and seem to be very common.

The car is at the shop and we will be dropping the engine to fixx leaks and probably replace clutch, so we may open the tranny to see what the problem is.

I was wondering if the "fix" they had on Modified would anything, they were saying that by replacing the Syncronizer Ring Spring what do you guys thing?



I will not be putting short gears at all, All I want is the grind gone.

Here a pic of the whole assy.

and the link to the article:
http://www.modified.com/tech/modp-0911-project-acura-nsx-final-drive-install/photo_09.html

-MSR

 

[FXMDBilly]

If you're going through the trouble to open the box, just suck it up and replace the synchros. Better yet, have them WPC treated (www.wpctreatment.com) before installing.

But synchros are 1/2 of the equation (but wear more than the corresponding teeth on the gears that the synchro engages). I still would say go with new synchros, it will be a worth while investment.


Billy

 

[MetalSpikeRacing]

Thanks Billy,

I was told I cant get the syncros by them self, that I have to buy the corresponding gear?


-MSR

 

[bikenut]

Yes you have to get the gear too I just replace mine when I did my short gears

Matt

 

[nsxtasy]

There's some misinformation in the posts above.

I had the same problem. It can be due to wear on the gear itself, on the synchro, or on the hub selector. These are all pieces inside the transmission, with teeth that are nicely squared off when new, but which can wear down, especially if the driver is not good at matching revs when shifting. The hub selector engages first, then the synchro, then the gear itself, and the parts tend to wear in the same order. Once the transmission is opened up, your mechanic can inspect the various gears, synchros, and hub selectors, and replace whichever one(s) are worn. You DON'T need to replace parts if they're not worn; for example, you can replace just the hub selector, or just the hub selector and synchro, without replacing the gear itself if it's not worn.

For more details, see this topic.

The gears, synchros, and hub selectors are all sold separately, although some of them are used for more than one gear (for example, the same hub selector is used for third and fourth gear). Below is the parts diagram for gears for a '91; you can click on it to view the part numbers and prices on the Delray Acura website. I believe that these are the items we're discussing, using the numbers in the parts diagram below:

2 - third gear

7 - third gear synchro ring ("synchro")

9 - third gear synchro spring

5 (two pieces) - third/fourth gear synchro hub ("hub selector") on the right, third/fourth gear synchro sleeve on the left

9 - fourth gear synchro spring - I assume this has the same diagram number as that for third gear because it is the same part number

7 - fourth gear synchro ring ("synchro") - I assume this, too, has the same diagram number as that for third gear because it is the same part number

3 - fourth gear

Also check out page 13-23 in the '91 service manual, which has the names of all these parts.

 

[MetalSpikeRacing]

Thank you very much for the info.

I think I am going to ahead and just replace all gears and syncros now that I will be in there with he case open.

I am not going to shove short gears in there , I feel like I would be rowing trought gears to often with 470 or so HP, plus I think that taller gears would give me better trottle control at the track.

It would be cheaper to buy too!!

-MSR

Is there a DIY for rebuilding the tranny? I have found one but the pictures are missing!!!

 

[dablackgoku1234]

Who's doing the rebuild for you? I am trying to price out how much short gears is going to cost.

 

[MetalSpikeRacing]

We arent sure yet, you should drop by the shop tomorrow and we can talk about it.

-MSR

 

[FXMDBilly]

We offer full transmission rebuilds from street to race, WPC treatments, hand-deburred gears, LSD upgrades, etc...

http://www.nsxprime.com/forums/showthread.php?t=124424

For your needs, a basic rebuild with new synchros/gears that are out of spec or worn with WPC treated synchros sounds like all you need.

Email me at [email protected] for pricing.


Billy