Grinding in 4th gear... Bad synchros?

96SNAKE · February 17th, 2011, 07:37 PM

Today, my car started grinding in 4th gear, I can't even put it in gear without it scratching so bad at me. Wondering what could be the problem? All the other gears and reverse work just fine. Was thinking that it might be a bad synchro. About how much will that cost to replace?

Any advice?

4valvegt · February 17th, 2011, 07:41 PM

If its not popping out of gear you can most likely get away with just replacing the blocker ring on the input shaft, if it pops out the entire syncro assembly and the input shaft will probably need to be replaced.

96SNAKE · February 17th, 2011, 07:45 PM

Roger it doesn't pop out, but it grinds so bad.. So I just go straight to 5th gear or back to 3rd. How much to replace the blocker ring on the input shaft?

4valvegt · February 17th, 2011, 07:53 PM

I have never had a t-45 apart which is what im assuming ur working with. Some transmissions you have to completely disassemble to get at the input shaft and some are a 10 min job just taking the front bearing cap off. A blocker ring usually ranges 10-100 bucks depending what its made out of. They are around 70 a piece in the 3650 but have a fiber insert so should be cheaper for yours. For now keep avoiding 4th like your doing so you dont chew up the teeth on the syncro sleeve and the input shaft.

96SNAKE · February 17th, 2011, 08:02 PM

OK, how much to replace the synchro?

4valvegt · February 17th, 2011, 08:08 PM

The blocker ring is part of the syncronizer assembly and is usually all you have to replace unless the surface it grabs is worn on the gear. I would say a couple hundred for the whole syncronizer assembly but i have no experience with this transmission. Your fluid is ok and full? clutch adjusted correctly?

DickH · February 18th, 2011, 01:06 AM

I could be wrong, but dont T45s have weak shift forks that bend easily? you could just have a bent shift fork that doesn't put it in 4th all the way. I am probably wrong though...

96SNAKE · February 18th, 2011, 09:24 AM

Okay thanks, guys.

Lefty · February 18th, 2011, 08:09 PM

Yes, T-45's are known for bent shift forks.

4valvegt · February 19th, 2011, 12:56 AM

More than likely not a shift fork if its not popping out of gear, if the shift fork is bent most of the time the sleeve wont slide all the way over the gear and they pop out.

February 17th, 2011, 07:37 PM	#1
96SNAKE Regular 96 Mystic SVT Cobra Join Date: Nov 2009 Location: Columbus, GA / Fayetteville, NC Posts: 327 iTrader: 0 reviews	Grinding in 4th gear... Bad synchros? Today, my car started grinding in 4th gear, I can't even put it in gear without it scratching so bad at me. Wondering what could be the problem? All the other gears and reverse work just fine. Was thinking that it might be a bad synchro. About how much will that cost to replace? Any advice? __________________ I have a 2.1L Kenne Bell for sale, polished. Pm me if interested.

February 17th, 2011, 07:41 PM	#2
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	If its not popping out of gear you can most likely get away with just replacing the blocker ring on the input shaft, if it pops out the entire syncro assembly and the input shaft will probably need to be replaced. __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

February 17th, 2011, 07:45 PM	#3
96SNAKE Regular 96 Mystic SVT Cobra Join Date: Nov 2009 Location: Columbus, GA / Fayetteville, NC Posts: 327 iTrader: 0 reviews	Roger it doesn't pop out, but it grinds so bad.. So I just go straight to 5th gear or back to 3rd. How much to replace the blocker ring on the input shaft? __________________ I have a 2.1L Kenne Bell for sale, polished. Pm me if interested.

February 17th, 2011, 07:53 PM	#4
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	I have never had a t-45 apart which is what im assuming ur working with. Some transmissions you have to completely disassemble to get at the input shaft and some are a 10 min job just taking the front bearing cap off. A blocker ring usually ranges 10-100 bucks depending what its made out of. They are around 70 a piece in the 3650 but have a fiber insert so should be cheaper for yours. For now keep avoiding 4th like your doing so you dont chew up the teeth on the syncro sleeve and the input shaft. __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

February 17th, 2011, 08:02 PM	#5
96SNAKE Regular 96 Mystic SVT Cobra Join Date: Nov 2009 Location: Columbus, GA / Fayetteville, NC Posts: 327 iTrader: 0 reviews	OK, how much to replace the synchro? __________________ I have a 2.1L Kenne Bell for sale, polished. Pm me if interested.

February 17th, 2011, 08:08 PM	#6
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	The blocker ring is part of the syncronizer assembly and is usually all you have to replace unless the surface it grabs is worn on the gear. I would say a couple hundred for the whole syncronizer assembly but i have no experience with this transmission. Your fluid is ok and full? clutch adjusted correctly? __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

February 18th, 2011, 01:06 AM	#7
DickH MM Fanatic 2003 gt 5.4 32v on the way Join Date: May 2007 Location: Omaha Posts: 4,188 iTrader: 2 reviews	I could be wrong, but dont T45s have weak shift forks that bend easily? you could just have a bent shift fork that doesn't put it in 4th all the way. I am probably wrong though... __________________ 2003 Mustang gt - usual mods - slowly working on 5.4 swap 2004 srt4 - Stock DD/winter beater Click here for your tuning needs Before asking a gearing related question click THIS link and enjoy all your saved time.

February 18th, 2011, 09:24 AM	#8
96SNAKE Regular 96 Mystic SVT Cobra Join Date: Nov 2009 Location: Columbus, GA / Fayetteville, NC Posts: 327 iTrader: 0 reviews	Okay thanks, guys. __________________ I have a 2.1L Kenne Bell for sale, polished. Pm me if interested.

February 18th, 2011, 08:09 PM	#9
Lefty Resident DJ '01 Cobra Vert. Join Date: Jun 2007 Location: Mechanicsburg, PA Posts: 28,699 iTrader: 12 reviews	Yes, T-45's are known for bent shift forks. __________________ 2008 Acura TL Type-S (the daily) 2006 Yamaha R6 50th Anniversary Edition (the other toy)

February 19th, 2011, 12:56 AM	#10
4valvegt Enthusiast 03 Cobra Join Date: Oct 2009 Location: Nebraska Posts: 809 iTrader: 1 reviews	More than likely not a shift fork if its not popping out of gear, if the shift fork is bent most of the time the sleeve wont slide all the way over the gear and they pop out. __________________ MM Cobra Club #86 2003 Mineral Grey Cobra 2004 True Blue F-150 FX4

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