Possible to Repair Synchros?
 

I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
cylinder 5 speed manual. The synchros grind pretty severely when
downshifting. Is there a synchro repair kit out there? I actually have
a transmission for a 6 cylinder that I could trade for a 4 cylinder
transmission, but I really don't know where to start. The only other
problems I seem to have with this jeep is it does blow any hot air (I
purchased a new thermostat for it) and the speedometer light on the
instrument panel does not light up. I would appreciate any advice.
Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

'Usually' that means someone has put the wrong tranny fluid in it. The
'correct' stuff is hard to find. The right stuff has a GL3 rating. All
the crap I could find on the shelves is listed as GL5 compatible which
will make synchros not work.

If you change back to the correct fluid, it might come back to life. My
T-5 did.

You might want to check the routing of the heater hoses. If the top one
is above the level of the coolant in the rad, it can air lock easily
stopping most of the heat. A good flush of the heater core works
wonders too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

'Usually' that means someone has put the wrong tranny fluid in it. The
'correct' stuff is hard to find. The right stuff has a GL3 rating. All
the crap I could find on the shelves is listed as GL5 compatible which
will make synchros not work.

If you change back to the correct fluid, it might come back to life. My
T-5 did.

You might want to check the routing of the heater hoses. If the top one
is above the level of the coolant in the rad, it can air lock easily
stopping most of the heat. A good flush of the heater core works
wonders too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

'Usually' that means someone has put the wrong tranny fluid in it. The
'correct' stuff is hard to find. The right stuff has a GL3 rating. All
the crap I could find on the shelves is listed as GL5 compatible which
will make synchros not work.

If you change back to the correct fluid, it might come back to life. My
T-5 did.

You might want to check the routing of the heater hoses. If the top one
is above the level of the coolant in the rad, it can air lock easily
stopping most of the heat. A good flush of the heater core works
wonders too.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

Hi Mark,
Learn to completely depress the clutch on shifting. It may be too
late for the down side of the sync ring, so for now one learn to double
clutch on the way down. Which is releasing the gear and engaging the
clutch in neutral and speeding the engine (cluster) to match the speed
of the gear being shifted into. The AX-15 will not fit. New
Synchronizers at:
http://www.crownautomotive.net/catal...ion/AX4_5.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

Hi Mark,
Learn to completely depress the clutch on shifting. It may be too
late for the down side of the sync ring, so for now one learn to double
clutch on the way down. Which is releasing the gear and engaging the
clutch in neutral and speeding the engine (cluster) to match the speed
of the gear being shifted into. The AX-15 will not fit. New
Synchronizers at:
http://www.crownautomotive.net/catal...ion/AX4_5.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

Hi Mark,
Learn to completely depress the clutch on shifting. It may be too
late for the down side of the sync ring, so for now one learn to double
clutch on the way down. Which is releasing the gear and engaging the
clutch in neutral and speeding the engine (cluster) to match the speed
of the gear being shifted into. The AX-15 will not fit. New
Synchronizers at:
http://www.crownautomotive.net/catal...ion/AX4_5.html
God Bless America, Bill O|||||||O
mailto:-------------------- http://www.----------.com/

macgraphics wrote:
>
> I recently purchased a 91 YJ Wrangler with 111K. The Jeep is a 4
> cylinder 5 speed manual. The synchros grind pretty severely when
> downshifting. Is there a synchro repair kit out there? I actually have
> a transmission for a 6 cylinder that I could trade for a 4 cylinder
> transmission, but I really don't know where to start. The only other
> problems I seem to have with this jeep is it does blow any hot air (I
> purchased a new thermostat for it) and the speedometer light on the
> instrument panel does not light up. I would appreciate any advice.
> Thanks and enjoy your Holidays. - Mark

Re: Possible to Repair Synchros?
 

Thanks Mike - I will try to locate some GL3 rated transmission fluid.
Should I completely drain what I have currently? If so, (this is going
to sound like a naive question) is this a simple process? I am a Jeep
newbie.

Re: Possible to Repair Synchros?
 

Thanks Mike - I will try to locate some GL3 rated transmission fluid.
Should I completely drain what I have currently? If so, (this is going
to sound like a naive question) is this a simple process? I am a Jeep
newbie.

Re: Possible to Repair Synchros?
 

Thanks Mike - I will try to locate some GL3 rated transmission fluid.
Should I completely drain what I have currently? If so, (this is going
to sound like a naive question) is this a simple process? I am a Jeep
newbie.