9" carrier break
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9" carrier break
Does anyone know what the carrier breaks are for the 9" rearend on my '68 F100. Mine came with a 3.70 ratio and I was wondering if I could replace it with a 3.89 or 4.11 without having to grind the housing.
Logistics Pro
Joined: Feb 2000
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From: Sun River St. George
9" carrier break
Not sure what you mean by "carrier breaks" but the gear ratio combination you described are a bolt in deal. You may be able to find a differential with the ratio you want and swap it in or replace the ring and pinion on your differential.
William in Atlanta
William in Atlanta
Laughing Gas
Joined: Apr 2002
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From: Apple Valley CA USA
9" carrier break
there are no carrier breaks for ford 9 inch. the unit was so well designed that you can use all the same parts for a 4.56 and a 2.50. now that being said if you are going from a 2.50 to a 4.56 you may need different axles as that moves the diferential spider pinion shaft over a lot and although there is room i don't know if there is that much room! hawkrod
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9" carrier break
Someone told me that Ford made two different housings and that the smaller of the two would not accept the larger rings, but I can't remember if it was 4.11 or smaller or larger. I had a 3.70 but wanted to go to the 3.89 or 4.11 without having to do any clearencing.
Fleet Owner
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From: Creedmoor, North Carolina
9" carrier break
As posted before a 9" is a 9" is a 9". Other than ratios the only difference is the axle spline count, and those are changable if the correct axles are changed too.
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Laughing Gas
Joined: Apr 2002
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From: Apple Valley CA USA
9" carrier break
well now that you mention it there are some late model housings that are not machined quite the same as the older ones and the ring gear can rub but a diegrinder and little effort will clearance the case so the gear does not rub (it is a small area by the pinion inner bearing). i think ford just quit the machining because late models never had steep gears. hawkrod
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9" carrier break
Thanks for the info, that saves me a big headache.
Do you guys have any preferences over what ring and pinion your using? Do the work yourself or farm it out? How about installation kits? When I was looking for a new gasket for mine all I could find were the paper ones, I found one website called Super-Gasket that had a nylon reinforced gasket, but so far they don't answer my e-mail, anyone heard of them?
Do you guys have any preferences over what ring and pinion your using? Do the work yourself or farm it out? How about installation kits? When I was looking for a new gasket for mine all I could find were the paper ones, I found one website called Super-Gasket that had a nylon reinforced gasket, but so far they don't answer my e-mail, anyone heard of them? Trending Topics
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
9" carrier break
What engine are you running and what is the trucks main use? The paper gasket is all you need. Kinda thin aint it? The gear takes about an hour to change out and can easily be done by you.
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In the cool still quiet of night, you can hear chevies rusting away.
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9" carrier break
It's a 240 right now that I'm going to rebuild to a 300 with performance upgrades that most of the guys are using in the inline forum. I don't haul anything and use it as a daily driver with a lot of freeway driving. I have the NP435 right now with a 3.25 rear, and was going to replace the tranny with either a Tremec 3550 or the ZF. Right now the truck is a real dog coming off the line with the 3.25. Before my 3.70 went bad it would accelerate hard off the line. By the way you wouldn't happen to know of something to help eliminate spring wrap that would work with my cantiliver rear leaf springs on my '68 would you? 
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
9" carrier break
I might offer this suggestion, when you rebuild the engine, put an AOD tranny behind it and 3.7? gears back in the rear. The 3.25 is what came behind the 352. Your truck should get pretty good gas milage though.
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In the cool still quiet of night, you can hear chevies rusting away.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
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9" carrier break
I'm not getting very good mileage right now; only 11mpg. This truck has a lot of blow-by because the person I bought it from just re-ringed it and did not bore it. I always liked driving a stick but I'm starting to consider the automatic. Strange Ranger posted that the AOD that I was considering wasn't strong and to go with the EAOD. I'm not really sure of what is wrong with the AOD as far as strength goes, but I know that I don't want to have to mess with all the electrical conversions that would have to be made with the EAOD. I do know that whatever I put in whether manual or automatic is going to have to have an OD. I can't see how anyone can drive on the highway without one.
Fleet Owner
Joined: Jun 1999
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From: Creedmoor, North Carolina
9" carrier break
I found this site to be rich with info about Ford auto trannys http://www.baumannengineering.com/ The AOD came behind the 302 mostly and was found in vans as well as pickups and cars. The AOD can be built to race so it can be build for trucking.
I wish there was an auto OD available for the FE, I would have to have one.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
I wish there was an auto OD available for the FE, I would have to have one.
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John
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In the cool still quiet of night, you can hear chevies rusting away.
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