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Old 11-06-2009, 09:15 PM   #1
newpony
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Default diagianose me new 89gt

89 gt 5speed runs strong
myconcers:
when on the freeway 2300rpm and above the shifter starts to shake(more of a vibrate)

the guy said it may need a need a new tranny mount


and the check engoine light it on above 2200rpm when on the freeway

it has cat delete
edlebrock 65mm throttle body
some aftermarket pullys
373 &posi
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89 lx,cobra clutch(adjustable at firewall), 3.73 gears,posi,shortshifter,aftermarket pullys,edlebrock 65mm throttle body,offroad h pipe no cats,flowmasters,aftermarket filter (bolted to maf)
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Old 11-06-2009, 09:45 PM   #2
PRO50SC
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OK so check your codes to see what they are. It's not rocket science.

The shifter thing, could be the mount, driveshaft balance, u-joint, something in the rear end, maybe the tranny itself. the list goes on.
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Old 11-06-2009, 10:10 PM   #3
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thanks i just wanted a idea

my user name is as follows

i hav a 86 but thats a whole nother story
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Old 11-06-2009, 10:58 PM   #4
mjr46
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Quote:
Originally Posted by newpony View Post
thanks i just wanted a idea

my user name is as follows

i hav a 86 but thats a whole nother story
huh???...............anyway run a Koer test and check for codes
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Old 11-07-2009, 03:19 PM   #5
newpony
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just saying that i am new to the mustang world

o yeay ang say if i an in 3rd on the freeway at 2krpm and i floor it it goes but while acccelertating it feels like it studders just a tad bit once around 3500 rpm+
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Last edited by newpony; 11-07-2009 at 03:23 PM.
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Old 11-07-2009, 04:26 PM   #6
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when is the last major tune up it had??
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Old 11-07-2009, 07:50 PM   #7
newpony
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idk but ill be sure to give it one(havnt looked for a sticker or anything)

..wouyld anyone know the speedo difference with the 3.73s ..(my guees is that its off by about 20mph(but i cant really tell) looks to be stock tires(it in my garage too lazy to go check tire size dont want to make too much noise)
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Old 11-07-2009, 08:23 PM   #8
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60 mph=2000 rpm with a stick
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91 mustang 5.0 lx,306 shortblock,E-303 cam,ported and polished E7's,rebuilt stock T-5,bbk E/L shorty headers,with their 2 1/2" o/r H-pipes,70 mm maf,3G alt.,upr adj. upper c/a's 3:73 gears. race weight with driver:3260,only a 100 lbs. more than the 85

85 mustang: parts car for now

Best time 13.7@ 102 mph 2.074 60' on street tires(in the '85)
Best time 14.3@ 96 mph 2.13 60' on street tires(in the '91)
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Old 11-07-2009, 09:17 PM   #9
newpony
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yea i think it says im doing like 75-80

thanks(i gona have to check the tire size(people usually do 70+)and while cruisin with them i was at 2000-2200rpm


anymore input on the shfter vibration

Quote:
Originally Posted by mjr46 View Post
when is the last major tune up it had??
Quote:
Originally Posted by mjr46 View Post
huh???...............anyway run a Koer test and check for codes
how do i go about doing this
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Last edited by newpony; 11-07-2009 at 10:06 PM.
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Old 11-08-2009, 02:15 PM   #10
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.....
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