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31fordcoupe 10-23-2009 08:17 PM

Changing out Ford 9 inch Gears
Question again for you guys. I have a Ford 9 inch third member that currently has 3.25 gears in it. Having never done a gear swap on a 9 inch before, are there any issues with putting in a set of 4.30's in the same carrier and housing? They should just swap out correct?

I am putting the 3rd member into a different 9 inch housing then the original one it was in (so it will be the housing and axels from one 9 inch and the 3rd member from a second 9 inch being melded together). They are 28 spline axels and they slide right into the third member that I am going to use if you need to know that. Thanks.

302 Z28 10-23-2009 08:59 PM

I could be mistaken, but I don't believe you can make that drastic a change in gear ratio and keep the 3:00 series carrier.


ericnova72 10-23-2009 09:17 PM

Sorry Vince, the Ford 9" has no "series" to the carrier, it is one size carrier fits all gears, no matter what the ratio.

bentwings 10-23-2009 09:22 PM

I looked in Speedway and Summit but didn't find any spacer for the 9 inch. I don't recall using one recently.

ericnova72 10-23-2009 09:38 PM


Originally Posted by bentwings
I looked in Speedway and Summit but didn't find any spacer for the 9 inch. I don't recall using one recently.

That's because there isn't one. All 9" Ford gears fit on the same carrier, doesn't matter what the ratio is. :)

31fordcoupe 10-23-2009 09:54 PM

Thanks again eric for your input. Johnny on the spot as usual!

WDCreech 10-23-2009 11:40 PM

Be sure to check to see that the 4.30s have the same spline pinion. It will be either 28 or 35 spline. The bearing and the support are different for each, but it's no problem. Just buy the correct bearing and support and the correct pinion yoke.

prostreet6t9 10-23-2009 11:50 PM

One other thing. 430 and 456's are the ratio's that the inside of the ring gear hit's the pocket Brg. When shopping,ask the supplier if the ring gear has the cut to clear the pocket brg with lower ratio's. All the Richmond sets usually have it. I've had quite a few Precision set's also. If you have to clearance the pocket only take as much as you have to.That's one of the places that diff likes to break.

barnym17 10-24-2009 07:54 AM

If the ring gear hits when backlashed properly double check your pinion depth sometimes if it is off it can cause this problem.

302 Z28 10-24-2009 09:31 AM


Originally Posted by ericnova72
Sorry Vince, the Ford 9" has no "series" to the carrier, it is one size carrier fits all gears, no matter what the ratio.

Yea I knew that...brain fart.. the 9" has adjusters instead of shims :drunk: .


Irelands child 10-24-2009 10:24 AM

"Way back", I bought a new 1965 Ford 500XL HiPo (390/330) with 4.11 posi gears. It showed up with 3.25's. The dealer had to change them out - and he had to replace the spool as well as the gears - I watched the process. I would make absolutely that you didn't need a different spool as well - and I for sure am not the expert

eloc431962 10-24-2009 11:28 AM

Fords 9 inch will swap in any ford 9 inch housing, I have done the swap several times through the years, I have used them from 57 and up no problems at all. Fords light bulb was burning bright when they did the 9 inch rearend IMO. Just make sure or the axle spline 28 or 31.JMO....Cole

31fordcoupe 10-24-2009 12:24 PM

Thanks guys very much for all of the responses. These are the two sets that I am looking at.


Is the cut you are referring the 45 degree cut on the back side of the ring gear on the first set that I listed? I don't see the same cut on the second set. Will either of these work? That is the first I had heard that about the 4.30 or 4.56 gears not clearing that bearing.

Thanks again.

prostreet6t9 10-24-2009 12:41 PM

Yes! But it's the second one listed. Not on the backside,the backside cut is just for saving weight.You see how the point is rounded off at the bottom of ring gear the tooth? The first listing is a PRO gear set. I'm thinking you dont need a PRO set. That Pro set looks pretty rough anyway.

prostreet6t9 10-24-2009 12:54 PM

If you get the Richmond set they may make a little noise. But thats not a bad buy.

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