Vibration at the top of 3rd gear??

Digsj7 · March 13th, 2011, 06:53 PM

No vibration in 1st or 2nd but when the rpm's start to climb (over 4000 to redline) in 3rd gear the shifter starts to vibrate like crazy and continues to vibrate even after I shift to 4th and 5th until I slow the car down. It shifts fine and very rarely grinds when going into any gear. Could this be worn tranny crossmember mounts causing vibration at higher speeds or something internal? I was going to order new urethane crossmember bushings and a urethane tranny mount and see if that helps my problem. Whatcha think?

FastStang91Lx · March 13th, 2011, 06:56 PM

Could be driveshaft, u-joints, or anything else that is mph related. Those rpm's are just getting you to higher and higher mph's.

Before the transmission is rpm, after is mph, and the trans can be some of each.

Digsj7 · March 13th, 2011, 07:09 PM

Never even thought of the driveshaft...Maybe I'll start with u-joints. There is absolutely no vibration until you get the r's up there in third. If you shift at 3 grand all the way through fifth..there is hardly any vibration in fifth gear at 60mph.

Dap1991 · March 13th, 2011, 07:21 PM

I have the same problem about 90mph up but i can feel it in the steering wheel, i had it realigned after i added the suspension and it is still there, since i feel it in the steering would that basically mean its in the front suspension somewhere?

FastStang91Lx · March 13th, 2011, 07:21 PM

hmmmmmm.... Hopefully it's not in the trans.

FastStang91Lx · March 13th, 2011, 07:22 PM

Originally Posted by Dap1991

I have the same problem about 90mph up but i can feel it in the steering wheel, i had it realigned after i added the suspension and it is still there, since i feel it in the steering would that basically mean its in the front suspension somewhere?

Yours could be as simple as a wheel out of balance.

Dap1991 · March 13th, 2011, 07:24 PM

alright that was another thing I was thinking, sorry OP didnt mean to thread jack

Digsj7 · March 13th, 2011, 07:43 PM

Originally Posted by Dap1991

alright that was another thing I was thinking, sorry OP didnt mean to thread jack

THREAD JACKING SON OF A BITCH!!!!!!!!!!!

just kidding, I don't care.

I just ordered a u-joint so we'll see if that helps it. Also ordered UPR uppers and lowers, new door handles with hinge kit and strikers...just kinda got on a order kick for a minute there.

FastStang91Lx · March 13th, 2011, 07:56 PM

You have 2 u-joints. Hope you didn't finish that order.

Digsj7 · March 13th, 2011, 08:02 PM

Originally Posted by FastStang91Lx

You have 2 u-joints. Hope you didn't finish that order.

whoops, better get back on LMR. Had the doors on my mind. Tired of those fucking poppers! LOL, thanks for the reminder! haha

March 13th, 2011, 06:53 PM	#1
Digsj7 Enthusiast 1993 Mustang LX my dog runs faster... Join Date: Jun 2010 Location: Columbus NE Posts: 626 iTrader: 0 reviews	Vibration at the top of 3rd gear?? No vibration in 1st or 2nd but when the rpm's start to climb (over 4000 to redline) in 3rd gear the shifter starts to vibrate like crazy and continues to vibrate even after I shift to 4th and 5th until I slow the car down. It shifts fine and very rarely grinds when going into any gear. Could this be worn tranny crossmember mounts causing vibration at higher speeds or something internal? I was going to order new urethane crossmember bushings and a urethane tranny mount and see if that helps my problem. Whatcha think? __________________ CAI, GT40 Intake, GT40P heads, 1.72 RR, 70mm Accufab, UPR Control arms, Hedman Headers, Mac H-Pipe, Flows, Pro-5.0, 3.73 Gears, BBK caster/camber kit, Eibach springs, Subframe Connectors, 5 lug conversion, MM+Cleavage Club Member #19

March 13th, 2011, 06:56 PM	#2
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	Could be driveshaft, u-joints, or anything else that is mph related. Those rpm's are just getting you to higher and higher mph's. Before the transmission is rpm, after is mph, and the trans can be some of each. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

March 13th, 2011, 07:09 PM	#3
Digsj7 Enthusiast 1993 Mustang LX my dog runs faster... Join Date: Jun 2010 Location: Columbus NE Posts: 626 iTrader: 0 reviews	Never even thought of the driveshaft...Maybe I'll start with u-joints. There is absolutely no vibration until you get the r's up there in third. If you shift at 3 grand all the way through fifth..there is hardly any vibration in fifth gear at 60mph. __________________ CAI, GT40 Intake, GT40P heads, 1.72 RR, 70mm Accufab, UPR Control arms, Hedman Headers, Mac H-Pipe, Flows, Pro-5.0, 3.73 Gears, BBK caster/camber kit, Eibach springs, Subframe Connectors, 5 lug conversion, MM+Cleavage Club Member #19

March 13th, 2011, 07:21 PM	#4
Dap1991 Hardcore Enthusiast 91 GT 90 LX 5.0 Join Date: Aug 2009 Location: youngstown, ohio Posts: 1,025 iTrader: 0 reviews	I have the same problem about 90mph up but i can feel it in the steering wheel, i had it realigned after i added the suspension and it is still there, since i feel it in the steering would that basically mean its in the front suspension somewhere? __________________ 1991 GT- All Stock 1990 LX 5.0- CAI, Shorty headers, flowmaster, Tubular Upper and Lower Control arms, Tokico HP series, Eibach Springs

March 13th, 2011, 07:21 PM	#5
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	hmmmmmm.... Hopefully it's not in the trans. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

March 13th, 2011, 07:24 PM	#7
Dap1991 Hardcore Enthusiast 91 GT 90 LX 5.0 Join Date: Aug 2009 Location: youngstown, ohio Posts: 1,025 iTrader: 0 reviews	alright that was another thing I was thinking, sorry OP didnt mean to thread jack __________________ 1991 GT- All Stock 1990 LX 5.0- CAI, Shorty headers, flowmaster, Tubular Upper and Lower Control arms, Tokico HP series, Eibach Springs

March 13th, 2011, 07:56 PM	#9
FastStang91Lx I Post Entirely Way Too Much 1991 Mustang LX 5.0 Join Date: Jan 2010 Location: Minnesota Posts: 5,572 iTrader: 2 reviews	You have 2 u-joints. Hope you didn't finish that order. __________________ Point made in less than a few hours with minimal response. http://www.moddedmustangs.com/forums...ml#post4465184

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