2.73 to 3.73 upgrade questions

nunly94gt

Founding Member

Feb 3, 2002

1,595

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38

Mobile, Al

Apr 30, 2009

#1

• Apr 30, 2009

• #1

Is there anything out of the ordinary that I need for this? I have all the shims bearings races and the ring and pinion pinion nut crush sleeve. So they were saying at work(ford dealership) that I may need som,ething, for the carrier because its machined differently for the smaller gears. He is however a chevy racing guy and said its that way on the chevy gears.
Help I want to do the install next week!!:SNSign:

 

jrichker

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Mar 10, 2000

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Dublin GA

Apr 30, 2009

#2

• Apr 30, 2009

• #2

See 8.8" Gear Installation for a how to do it gear change. Because of the tools and expertise needed to do the job right and not get gear whine, most guys farm the job out to a shop that specializes in rear axle repair.

 

90limited

Founding Member

Apr 13, 2002

276

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18

Port Charlotte FL

Apr 30, 2009

#3

• Apr 30, 2009

• #3

you should not need anything special... other then what the above link mentions. That said, given the age of the car I would put new clutch packs in the trak-lok. You can get the kits off e-bay for around $50 I think.

I changed from 2.73 to 3.55 and replaced all bearing including the axle bearing and seals. I also had the trak-lok rebuild using the carbon fiber clutchs that are used in the cobra and what a difference from b-4. It cost $300 in labor for everything.

 

nunly94gt

Founding Member

Feb 3, 2002

1,595

3

38

Mobile, Al

Apr 30, 2009

#4

• Apr 30, 2009

• #4

Jrichker- I work at a ford dealership and we do rear ends all the time. I personally want do them but there is a guy that does them.

Thanks for the info guys. Ill see if I can scrounge up the trac-lok clutches. There are probably som,e laying around here in the shop......like every other part im installing

 

TRWXXA

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Jan 18, 2003

190

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May 1, 2009

#5

• May 1, 2009

• #5

nunly94gt said:

So they were saying at work(ford dealership) that I may need som,ething, for the carrier because its machined differently for the smaller gears. He is however a chevy racing guy and said its that way on the chevy gears.

Click to expand...

He was probably thinking about the carrier cross pin. It has to be machined with a notch in it to clear the ring gears above a certain ratio. You don't need to worry about it unless you go with 4.30s or higher on an 8.8" rear end, or 3.73s or higher on a 7.5".

+1 on farming out the job. It requires special tools and some experience to do the job right. A bad rear gear install will give you all kinds of headaches.