Transmission

[87Mustang351]

I have recently before i put my car on the road had my guts of my tranmission put in another casing because of a crack in mine. and ever sence they put it in my car now does 2 New FANTASIC things 1: pop out of first gear on a up hill slope,only way it will not pop out is if im still moving and put it in first, and 2: a bad viberation all through my car...like seriously at 120 KPH if i sat a girl on my shift she wouldnt last 10 seconds on there....i really need to know if something is put in the trans wrong will it make a viberation?

 

[Bladez5_0]

Have you tried adjusting your shifter stops to allow more throw to set the tranny deeper in the gears? As for the vibes. Are you sure that you have the driveshaft in the correct position instead of 180* out maybe?

 

[Mustang5L5]

Did it do this before you swapped cases?

SOunds like something wasn't set right

 

[87Mustang351]

no it didnt do it before but sence then i have tryed the driveshaft i drove it home with and such what do you mean 180*? can you explian some more?

tthis might be the problem the vibes right up thrugh the middle of the car

thanks
Todd

 

[Bladez5_0]

The driveshaft of the car is balanced to be installed a certain way. You can reinstall it 180 degrees out of normal position which causes vibrations. Other people have had issues with keeping the stock driveshaft and moving up to 3.73's and 4.10's. They'll have vibrations that they can't get rid of until they got an aluminum driveshaft. Not sure if it's an issue with the stock driveshaft's balance or not.

 

[87Mustang351]

well i had a stock drive shaft in and i have 4:10s and it never shook before...so what your saying basically is try the drive shaft in another set of holes ? a new set of 4 i mean

 

[Bladez5_0]

Firstremove the driveshaft and reinstall it a half turn from where it is now. I think you can only install it 2 ways but I'm not sure. On mine you can see the outline in the surface rust from where it was installed at the factory.

 

[jrichker]

There should be a yellow paint mark on the D/S and axle flange. Match the two up and you will be lined up to factory specs.

With 3.55 or higher gears, the stock D/S balance may not be good enough to keep the vibrations down to an acceptible level. Balancing the driveshaft can fix that. A new FMS aluminum D/S is a good fix, but expensive - about $250 unless you can get an Ebay bargain.