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Loud thud when i give my 91 T/A some gas

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Old Nov 7, 2008 | 04:55 PM
  #1  
Gary Berg's Avatar
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From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Loud thud when i give my 91 T/A some gas

Every time im pulling out of my street i hear a loud thud come from either the tranny or rear. my dad says i might need a new yoke. any other ideas?
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Old Nov 7, 2008 | 05:00 PM
  #2  
Rayvan's Avatar
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Car: '89 Formula WS6 N10 No T-Tops
Engine: LB9 225HP
Transmission: T5
Axle/Gears: 3:45BW
Re: Loud thud when i give my 91 T/A some gas

Transmission mount is likely broken.
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Old Nov 7, 2008 | 05:07 PM
  #3  
Gary Berg's Avatar
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From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Re: Loud thud when i give my 91 T/A some gas

wat should i look for? a crack in the mount?
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Old Nov 7, 2008 | 05:10 PM
  #4  
Rayvan's Avatar
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Car: '89 Formula WS6 N10 No T-Tops
Engine: LB9 225HP
Transmission: T5
Axle/Gears: 3:45BW
Re: Loud thud when i give my 91 T/A some gas

Originally Posted by Gary Berg
wat should i look for? a crack in the mount?
Take a lever, like a crowbar under the car with you and lever up the back of the transmission. You'll know pretty quckly if it's broken...

Bottle jack works too. Or a scissor jack etc...
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Old Nov 7, 2008 | 05:17 PM
  #5  
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From: Western WA
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Re: Loud thud when i give my 91 T/A some gas

it could be rear control arm bushings too...
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Old Nov 7, 2008 | 05:24 PM
  #6  
Stephen's Avatar
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From: Bertram (outside Austin), TX
Car: 87 GTA
Engine: L98
Transmission: 700R4
Axle/Gears: Dana M78 3.27 posi
Re: Loud thud when i give my 91 T/A some gas

I agree with the broken tranny mount too. If you have a T5, it is more easily noticed, by the shifter movement, than it is on a 700R4.
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Old Nov 7, 2008 | 05:51 PM
  #7  
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From: pawtucket RI
Car: 1986 iroc
Engine: alum. head 350 supercharged
Transmission: 6speed
Axle/Gears: ford 9in 3.90 35 spline moser axles
Re: Loud thud when i give my 91 T/A some gas

tranny mount most likely they go all the time use an energy suspension one or similar
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Old Nov 7, 2008 | 06:52 PM
  #8  
Gary Berg's Avatar
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From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Re: Loud thud when i give my 91 T/A some gas

how much would that run me?
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Old Nov 8, 2008 | 10:48 AM
  #9  
Atilla the Fun's Avatar
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From: Northern Utah
Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: Loud thud when i give my 91 T/A some gas

You should be able to get one at your local AutoZone for cheaper than paying the handling fee from Summit or Jegs. I haven't bought one in a while, but it's likely around $15.
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Old Nov 8, 2008 | 10:55 AM
  #10  
Stippy17's Avatar
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From: Pittsburgh, PA
Car: 1986 Trans Am, 1985 Trans Am
Engine: 400 SBC, H.O. 305
Transmission: TH400, 700R4
Axle/Gears: 10 Bolt/3.73s, 10 Bolt/3.73s
Re: Loud thud when i give my 91 T/A some gas

Yup, its most likely your tranny mount. I had to replace mine once already, and I may have cracked this one too. You can get one from Advance or Napa, they run around $10 if I remember correctly.

Really easy to replace too, wont take you much time at all.
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Old Nov 8, 2008 | 10:52 PM
  #11  
Gary Berg's Avatar
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From: Pennsylvania
Car: 86 T/A WS6/Future project
Engine: 350 TPI/ Pontiac 455
Transmission: 700R4/TH400
Axle/Gears: Posi.
Re: Loud thud when i give my 91 T/A some gas

ok good it sounded expensive at first. thanks alot!
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