Topic: 65 GT Auto with 3.00 Gear Ratio - Rear End Whine

[rocket289k]

Hi Guys,

The troubleshooting of this build continues.  I have a noticeable whine from the rear end (rises and falls with speed of the car).  This is the second set of rear end gears I've had in the car.  The first gear set was really noisy.  The second set is a little better but still noisy.  I've had one fellow tell me that noise from the 3.00 to 1 gear ratio is common with Ford 8" rear ends.  That's the first I've ever heard of that and am skeptical to say the least (especially since so many Mustang used that gear ratio).

Thoughts?

Ron

[carlite65]

what weight gear oil are you running?

[Sam Cro]

when you set the back lash on the gears is it correct ?

Sam

[Bob Gaines]

Hi Guys,

The troubleshooting of this build continues.  I have a noticeable whine from the rear end (rises and falls with speed of the car).  This is the second set of rear end gears I've had in the car.  The first gear set was really noisy.  The second set is a little better but still noisy.  I've had one fellow tell me that noise from the 3.00 to 1 gear ratio is common with Ford 8" rear ends.  That's the first I've ever heard of that and am skeptical to say the least (especially since so many Mustang used that gear ratio).

Thoughts?

Ron

Was the "one fellow" the person who set up the ring and pinion   . It shouldn't whine if set up properly.

[rocket289k]

Was the "one fellow" the person who set up the ring and pinion   . It shouldn't whine if set up properly.

Hi Bob,

Nope it was a different person who made that comment.  LOL.  I figured it should be nice and quiet.


Ron

[rocket289k]

The OEM manufacturer had a cutting technique that aftermarket manufacturers of 8" Ford gears have not been able to duplicate. The 8" Ford Yukon Gears in 3.00 for example have a "noisy" sticker on the side of the box for this very reason. I consider them the best aftermarket choice.

I installed NOS 3.00 gears for the above reason and they are dead silent.

If you are running OEM gears with noise, assuming all other parts have no issues, it is setup lash or worn gears.

Thanks for the info.  The whine has quieted some after about 300 miles.  I am running an aftermarket 8" ring and pinion as at some point in the car's life someone swapped in 2.80 gears.  If it continues to be a problem I'll have to try to track down a good set of NOS 3.00 gears.  That's one NOS part that I haven't looked for before.

If anyone knows of a good source to try to track down a NOS gear set please let me know I'm not having any luck with the usual sources (eBay, Hemmings, etc.)

Regards,

Ron

[rocket289k]

I purchased mine from All Classic Motors (allclassicmustang.com)

C4OZ-4209-H.

Thanks - I tried to contact All Classic Motors but I haven't heard back.  If I'm not mistaken C4OZ-4209-H is a 3.50 gear ration is that correct? 

Does anyone have the part numbers for the ring and pinion gears for all of the rear end gear ratios?  I'm looking part number for the 3.00 gear ratio in particular.

In addition, can anyone recommend any other NOS parts providers that they have done business with?

Regards,

Ron

[rocket289k]

That P/N I provided is correct for a 3.00 (39 ring gear / 13 tooth pinion).

I'm sorry my bad C4OZ-4209-J is for a 3.50 gear ratio.


Regards,

Ron

[rocket289k]

Hi Guys,

I heard back from All Classic Motors and unfortunately he doesn't have a NOS 3.00 gear ratio 8" ring and pinion set (C4OZ-4209-H) available. Can anyone recommend any other NOS parts providers that they have done business with?

Thanks,

Ron