Ok, so i recently starting getting a slight grind when shifting into 3rd at a high rpm. I bought some gm synchromesh friction modified and changed the tranny oil with it. Its now been atleast 500 miles since than and i still have the slight grind. I'm now starting to think that the slight grind is not due to my synchros being worn, since synchromesh didn't help. I'm thinking its possible that my motor mounts or shifter bushings could be extremely worn/possibly torn, so i just bought es motor mount inserts and shifter stabalizer bushings. They only cost me about 50 bucks for both, so all in all really not a bad buy. Hopefully after i install these parts it will fix my problem, but if it doesn't i didn't really waste my money anyways since the inserts should help eliminate my wheel hop and the bushings should make my shifting much smoother. Also i will know that the source of the 3rd gear grind is most likely the tranny. What do you guys think?

 

i had the exact problem you had. tranny was grinding in 3rd, and was pretty notchy in 5th. I put in syncromesh and it really did not help. So I bought some motor mounts, and the grinding stopped. Hopefully it will work out for you like it did for me!

 

ive got the same problem with my car, i just take my time going into third and it doesnt grind, if i go just as fast as i go from 1st to 2nd, it will grind, i have to go much slower into third or i grind.

 

I am having the Exact same problem. It started a couple of months ago and has proceeded to get much worse. Somtimes it shifts fine but others especially high speeds, I almost have to pull it into gear and usually get a grind. I thought it might be the cluch fluid, but i re-bled it with new fluid and the same problems still there.

I never thought about the motor mounts bein a cause ill have to check out mine.

 

mines used to do it turns out the rear mount went loose and was causing it.

 

gm synchromesh isnt gonna work right away. gotta ride with it for awhile

 

so your saying at 70mph when im about to shift to third i put the clutch in put it in second then go to reverse? hmm intresting

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ekdreamer &raquo;</TD></TR><TR><TD CLASS="quote">pretty common... hold the clutch in, put it in second, then put it in reverse.... the grinding should stop</TD></TR></TABLE>

huh? i would see how this would stop the common reverse grind, but how the hell would it prevent a grind into 3rd gear when shifting at a high rpm?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LS95eg &raquo;</TD></TR><TR><TD CLASS="quote">gm synchromesh isnt gonna work right away. gotta ride with it for awhile</TD></TR></TABLE>

how long? like i said, ive had it for about 500 miles or more. does it really need longer to take affect than that? like 1000 miles?

 

damn mine does this too, i should look into replacing my worn mounts.

 

good topic my **** is doing hte smae thing. I have stock shifter bushings and some window filler in my mounts, "forgot the real name of it but it stiffens it up." I need to put more in though and I never did the rear mount. I thought my sycros were shot but I'll fill em in better and get shifter bushings along with the sycromesh.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dan_w_82 &raquo;</TD></TR><TR><TD CLASS="quote"> I have stock shifter bushings and some window filler in my mounts, "forgot the real name of it but it stiffens it up." . </TD></TR></TABLE>
3m window weld i used the same stuff

 

^^^ Yeah that stuff LOL I was trying to think of the exact name of it but it's late.

Thanks

 

sorry if this was said but just dbl clutch it put it in nutral then let the clutch out then put it back in then into 3rd. forget periods i dont like them hahahahaha anyways if the helps then its the syncros and a new grear

 

possibly a clutch problem.

Too many people think synchros when their car grinds, and they end up finiding roken hub springs or something similar

 

Why are using syncromesh? That is not the correct fluid for Honda transmissions. If you have a grinding problem, get it fixed or live with it. Dont try to cover the problem up with the wrong fluid and damage your transmission further.

 

Syncromesh won't damage the transmission... it's gear oil.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CycloneBlue_1.6EL &raquo;</TD></TR><TR><TD CLASS="quote">Syncromesh won't damage the transmission... it's gear oil.</TD></TR></TABLE>

Oh ok. *rolls eyes* You do know that synchromesh is a semi-synthetic fluid that is not the correct weight for honda transmissions? Maybe Honda engineers are too dum to know what is best for their own transmissions right? Id be willing to listen to the argument that Honda doesnt want you buying competitor's products, except that on all bottles ive ever seen it says recommended for GM/Chrysler vehicles only. Wouldnt they want to sell as much as they can by saying good for ALL vehicles including imports?

A quick search reveals Im not alone.

https://honda-tech.com/zerothread?id=1133693

 

So, basically, you're telling me that GM syncromesh is bad for our transmissions just because some people "say" it is? Those transmissions that were taken apart that had the syncromesh in them were likely worn pretty bad before the syncromesh was added in. Despite some of what I read in there, most people put it in as a last resort to aid a problem which has already developed. Therefore, worn transmissions.

Don't try and tell me that syncromesh is bad because you read it in another post, give me some PROOF... and I may change my mind. Oh, and linking me to yet another thread where people argue what they think would be a waste of time.

 

Synchromesh will not fix broken teeth on a synchro gear. That is most likely why you are grinding when you shift into 3rd gear.

 

3rd gear grind is common.

This is the reason, don't let anyone tell you different. DRIVER ERROR!!!!!!

Synchromesh may help slight grinds but come on people this isn't magic sauce, it can't fix every problem....did NOT fix mine.

If the grind is too severe, the GM stuff won't help, you NEED A TRANNY REBUILD.

Don't let these guys who don't really know **** about their car telll you that it might be something else.

Just drive it till it doesn't work anymore at all, then buy new tranny!!!!!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CycloneBlue_1.6EL &raquo;</TD></TR><TR><TD CLASS="quote">So, basically, you're telling me that GM syncromesh is bad for our transmissions just because some people "say" it is? Those transmissions that were taken apart that had the syncromesh in them were likely worn pretty bad before the syncromesh was added in. Despite some of what I read in there, most people put it in as a last resort to aid a problem which has already developed. Therefore, worn transmissions.

Don't try and tell me that syncromesh is bad because you read it in another post, give me some PROOF... and I may change my mind. Oh, and linking me to yet another thread where people argue what they think would be a waste of time. </TD></TR></TABLE>


Lol, the proof is in the manufacturer recommendations and on the bottle of the syncromesh itself. THe facts are that this type of fluid is NOT recommended for Honda transmissions. This is the equivalent to putting a way different type and viscosity motor oil that was designed for a different engine into yours and saying proove to me it doenst damage my engine. But according to you, its all oil so it theres nothing to worry about. Thats genious man.

Quoted from Penzoil:

APPLICATION
PENNZOIL® SYNCHROMESH FLUID is specifically formulated for synchromesh transmissions used by General Motors
requiring General Motors Part No. 12345349 (Specification No. 9985648) Synchromesh Transmission Fluid or Chrysler
transmissions requiring Part No. 4874464 (Specification MS-9224). It is also recommended for use in General Motor
transmissions requiring General Motors Part No. 12345577. It is listed in the Pennzoil Lubrication Recommendation And
Capacities Guide as “GLS.” PENNZOIL® SYNCHROMESH FLUID is NOT intended for all GLS applications. You
must verify the manufacturer’s part number, indicated by a superscript number and found at the end of the vehicle
application listing.



Now why wouldnt Penzoil recommend this great product for all vehicles? No where do I see them even hint that you should use this is in a non-GM transmission. In fact they go so far as to say they only reason they made it is for GM transmissions.

This is not unprecedented. As you may know, Honda uses a special type of power steering fluid designed only for Hondas.


Modified by KSE at 5:24 PM 2/10/2005

 

I like this guy

Synchromesh at best is a bandaid for a transmission/clutch in need of work.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KSE &raquo;</TD></TR><TR><TD CLASS="quote">Now why wouldnt Penzoil recommend this great product for all vehicles? No where do I see them even hint that you should use this is in a non-GM transmission. In fact they go so far as to say they only reason they made it is for GM transmissions.

This is not unprecedented. As you may know, Honda uses a special type of power steering fluid designed only for Hondas.</TD></TR></TABLE>

I'm quite aware that they don't recommend using their products in anything else other then they're intended for... it's not a big surprise. Quoting a label and even going so far as to take a picture of it proves nothing. My arguement was that syncromesh will not RUIN the transmission. The only way to prove that syncromesh actually does ruin Honda transmissions is long term, controlled testing. Test two of the same brand new transmissions, one with Honda MTF, one with Syncromesh for a long term, with the same driving conditions and take them apart to compare measurements of everything. Because nobody is actually going to do this, you can't prove to me that syncromesh will cause direct harm to a Honda transmission.

However, you are right about the fact that it is not recommended... and for this reason alone, I wouldn't use anything other than Honda MTF in my car.

 

Synchromesh is not going to allow the wear characteristics designed to be allowed by the MTF....period. Synchro rings are specifically made to wear so that other parts do not wear , and they wear into fine particles. Certains parts need to wear whenever contact ocurrs.