AMC Eagle Den Forum

The Shop => Transmission Shop => Topic started by: Demigawd on May 01, 2011, 04:18:47 PM

Title: reverse gear grinding?
Post by: Demigawd on May 01, 2011, 04:18:47 PM
when i put it into reverse it seems to grind or growl at me the tranny fluid is now black ish and smells burns may be time for that ax15 swap in once im done rebuilding the motor, unless its an ez fix for the stock transmission
Title: Re: reverse gear grinding?
Post by: amc78concord on May 01, 2011, 05:09:28 PM
My 5 speed Jeep does the same thing...with the clutch pushed in and everything.  Could it be bad gear synchronizers?  I'd like to know why it does this as well...
Title: Re: reverse gear grinding?
Post by: Draekon on May 01, 2011, 05:30:17 PM
Quote from: amc78concord on May 01, 2011, 05:09:28 PM
My 5 speed Jeep does the same thing...with the clutch pushed in and everything.  Could it be bad gear synchronizers?  I'd like to know why it does this as well...
T5 transmissions (at least earlier ones) did not have a reverse synchronizer.  They used a sliding idler gear.


If the input shaft is still spinning from inertia or momentum or anything, it could let out a quick grinding sound.
Otherwise, make sure that the clutch is getting fully disengaged when the pedal is depressed.
Title: Re: reverse gear grinding?
Post by: Sunny on May 01, 2011, 07:21:13 PM
Try putting it into first, then into reverse when you stop, and it almost always stops the grinding.
Don't let up on the clutch though.. Stop.. hold it down.. put it in first..then without taking your foot off the clutch, just put it into reverse.

If it still grinds, you have an adjustment problem, or internal damage.
Title: Re: reverse gear grinding?
Post by: IowaEagle on May 01, 2011, 07:27:51 PM
I forgot about that old trick.  It usually works though.
Title: Re: reverse gear grinding?
Post by: AMCKen on May 01, 2011, 07:38:17 PM
I've had to do that touch-another-gear-first trick for quite a few years in my 80 AMX. The clutch doesn't fully release so touching the sychro in a forward gear stops the tranny for a sec so you can slip it into reverse. This will eventually wear out the sychros so I will have to get it fixed.
Title: Re: reverse gear grinding?
Post by: Sunny on May 01, 2011, 07:45:18 PM
Quote from: IowaEagle on May 01, 2011, 07:27:51 PM
I forgot about that old trick.  It usually works though.

My grandfather was a transmission mechanic, so I learned some neat tricks.
Title: Re: reverse gear grinding?
Post by: IowaEagle on May 01, 2011, 07:48:26 PM
We used to have to shift to second before shifting into first at a stop when many transmission did not have first gear syncrhos.  Those were the days.
Title: Re: reverse gear grinding?
Post by: Demigawd on May 02, 2011, 02:15:09 AM
Mines a 3 speed automatic and it grinds wile moving in reverse not like idleing
Title: Re: reverse gear grinding?
Post by: LaGuardia on May 02, 2011, 11:25:51 AM
Why did we all think "manual" ?

Then I guess something gear related... The AT fluid's color and smell is not enough to diagnose a tranny problem, though. Maybe it's just been sitting there too long. I'd open the pan and check for metal debris or something like that. If you don't find any, replace the filter and try fresh fluid.
Title: Re: reverse gear grinding?
Post by: Demigawd on May 02, 2011, 02:26:53 PM
the fluid was fine and cherry red before it started grinding =P