Grinding in third gear, how much time do I have left

**Mr-Rock** · 05-23-2009, 05:06 PM

My AX-15 started grind when shifting into third gear, I assume the synro's arre going. how much time to I have before ther rest start going?? Is there any thing I can do to "save" it for a while??

Thanks

Krochus · 05-23-2009, 05:19 PM

try replacing the existing fluid with SYNCROMESH

giggityjeeper · 05-23-2009, 07:08 PM

time for a fluid change, maybe your clutch is needing some fluid to...or maybe its the clutch not hte trans...mine grinds in 2nd and third and downshifting to 2nd and 1st or over 3 years now....still going storong change the oil 2 times per year

tippmann243 · 05-23-2009, 08:06 PM

my trans ground going into 3rd for a bit.

it was my daily at the time and my other vehicle was down for the winter. i drove it for most of the winter i would sya 2-3 months. did fine, i just couldnt use 3rd gear at all.

93jeepyj · 05-23-2009, 09:13 PM

I would try the syncromesh if your not already running it. If so double clutching takes the stress of the syncros and should keep it from grinding.

mrclean · 05-23-2009, 09:42 PM

Quote:

Originally Posted by Mr-Rock

how much time to I have before ther rest start going?? Is there any thing I can do to "save" it for a while??

Thanks

It may work for a week, it may never fail, no way to tell. As others have said, change out the fluid. Synchromesh is a good substitute for the factory fill(cheaper too). You also may want to add a bottle of that Lucas Oil additive. Looks like a bottle of snot, but it may help a bit(quieted mine down, although a couple of bearings were going bad in mine, not synchros).

**Mr-Rock** · 05-23-2009, 10:50 PM

Quote:

Originally Posted by Krochus

try replacing the existing fluid with SYNCROMESH

Do I use 75-90w gear lube? i thought I read somewhere that now you are supposed to use 10w30, Is this true???

mrclean · 05-23-2009, 11:08 PM

Quote:

Originally Posted by Mr-Rock

Do I use 75-90w gear lube? i thought I read somewhere that now you are supposed to use 10w30, Is this true???

Don't use either of those, you will accelerate the demise of your trans.
The stuff you want is called Synchromesh, Autozone carries it(others may also, but I know for sure AZ has it).
Redline also has a suitable substitute(MTL or MT90, can't remember which). But it is more expensive, and for me, harder to get, as there is no local Redline dealer.

Krochus · 05-23-2009, 11:16 PM

Quote:

Originally Posted by Mr-Rock

Do I use 75-90w gear lube? i thought I read somewhere that now you are supposed to use 10w30, Is this true???

as the poster above mentions use neither of those.

This is the magic bottle you're looking for. This stuff is simply amazing, I need to rebottle this stuff as "liquid ax15 rebuild kit" and sell it for $100 a quart

see this thread

http://www.jeepforum.com/forum/f12/penzoil-synchromesher-read-before-replacing-synchros-747237/?highlight=syncromesh

**Mr-Rock** · 05-23-2009, 11:47 PM

[QUOTE=Krochus;7278687]This is the magic bottle you're looking for. This stuff is simply amazing, I need to rebottle this stuff as "liquid ax15 rebuild kit" and sell it for $100 a quart

Ok, just got done reading thru that thread and in the morning I'm off to find some.
I'll let you know how it works for me.

Thanks to everyone!

uglyoldbob · 05-24-2009, 01:05 AM

Not my thread, but a related question. If double-clutching and a fluid change to the aforementioned syncromesh doesn't solve grinding into third gear, then would the clutch/syncro's be worn? It works great and I plan on pulling the transmission when I have a spare vehicle.
I would say great things about the syncromesh, but just changing the fluid wasn't enough to prevent grinding in my case. I can't quite rule out wear of other components yet though.