Narrowing 9 inch housing

[sosky1]

I just talked with a shop about narrowing a 9 inch housing to fit a 1965 Mustang. They asked about pinion offset; a question nobody else asked. What are all the specs I need to make sure this shop does the job correctly? Thanks!
Larry

 

[HistoricMustang]

Larry, I am not sure what pinion offset has to do with narrowing a 9" rear end.

I had a '70 9" narrowed by Currie to fit my '65 (plus narrowed an extra 1/2" on each side so 8 1/2" rims would fit). Pinion effects never entered into the conversation.

HistoricMustang
www.historicmustang.com

 

[sosky1]

That's what threw me; none of the other shops mentioned pinion offset.

 

[Great68]

Historic: Currie does so many rear ends that I bet when you told them the rear was going into a 65 Mustang they knew exactly what the measurements should be.

I wish I could answer sosky's question though. I didn't think there was any offset for a Mustang.

 

[Cbarton]

Hey Historic, I have a pair of Currie 28 spline axels with less then 2000 miles on them. From my 65, shortened .5" on each side. I upgraded to large bearing and 31 spline. Are you interested in a spare set cheap?

Chris

Larry, I am not sure what pinion offset has to do with narrowing a 9" rear end.

I had a '70 9" narrowed by Currie to fit my '65 (plus narrowed an extra 1/2" on each side so 8 1/2" rims would fit). Pinion effects never entered into the conversation.

HistoricMustang
www.historicmustang.com

 

[D.Hearne]

The pinion isn't offset in a Stang, it's centered as far as I can recall. This puts the ring gear off to one side and gives you a long and short axle. If you wanted both axles to be the same length, then you'd want to offset the pinion to one side.

 

[sosky1]

Thanks! Maybe he's thinking of a truck application.
Larry

 

[HistoricMustang]

Cbarton, thanks but I already have an extra set of axles.

Currie, you are correct. Currie has all the charts for applications of 9" rear ends into different cars. They did the entire job - all I had to do was send the rear end housing.

HistoricMustang
www.historicmustang.com

 

[Dark Knight]

the pinion is offset in the 9in carrier, centered in the 8.8. tell them you want the pinion centered. are you getting aftermarket axles? if so, tell them the width from flange to flange and that the pinion is centered and they'll know what length to make each side.. they are different lengths.. the tubes will be too..

here's a pic of mine
http://members.cox.net/darkknight102/68cage1.jpg

 

[krash kendall]

What kind of dollars does it cost for a basic shortening? My '65 has an unshortened '69 9" in it (previous owner's handywork) so I'm running inset wheels on the back with wheel covers all around. Two spare tire's are required as the rear size rubs the steering knuckles when put up front. Also, mags look rediculous no matter how you configure them.

Just a general cost please.

 

[Dark Knight]

narrowing the housing doesnt cost that much.. the parts that add up are stuff like axles, studs etc..

did the car have an 8in originally, and do you have it? 28 spline axles are the same for an 8in and 9in.. you could have the 9in narrowed to use your old axles.. should be around $200, depending on if the spring perches need to be moved.. I'll have to look at the reciepts to see how much I paid..