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Author
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Topic: Which rear end should I get ??????
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66-347
Journeyman Posts: 8
From: Los Angeles
Registered: Nov 2004
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posted 01-07-2005 12:40 AM
   
I'm finishing up my 66 and all I need to do is pick a rear end. This will be my track car. I can get a complete build 9" full spool, 35 spline, bearings, 3.73. Or a complet 8.8 eaton posi, 31 spline, 3.73. The price difference is about $800 bucks. I've talked to several people and say I should be fine with the 9" and full spool if I don't plane on driving it a lot. The 347 should make around 380 rwhp n/a. I'm also going to spray a 200 shot would the 3.73 be o.k. or should I get 4.10's. I will be shifting around 6700 with a 26" tire.
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Catmando
Gearhead Posts: 181
From: Vermilion, OH USA
Registered: Jun 2004
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posted 01-07-2005 11:47 AM
While the 8.8 is certainly strong enough , and certainly more affordable, if you can swing it get the 9inch. It sounds as if it is build to take anything you are going to throw at it! Plus, if you need to make a ratio change, the 9 inch is way easier to change out than laying under the car or tearing out the whole axle to complete a gear swap on an 8.8 axle.
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steve'66
Gearhead Posts: 9476
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 01-07-2005 07:55 PM
Good advice above.^^You might want a 3.89 gear if you think you'll hit 125+ in the 1/4 otherwise 4.10s will work well. Is this a auto or manual tranny? You won't need that strong a 9" with an automatic. My daughter's car has a 9" with 3.89 gears, c-4 w/T-brake, 28 splined Moser axles, cheap full spool, single ribbed center section, stock pinion support, in a '58 housing. Pretty low budget rear. It's held up great for three years doing 1.42 60'ers, since we 86'd the T-5.  The 8.8 is a good rear too, just harder to make gear changes. The 8.8 is more efficient at transfering h.p. than the 9" but I don't think you'll notice the difference. SteveW
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Moneymaker
Administrator Posts: 26811
From: Lyons, IL, USA
Registered: May 99
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posted 01-09-2005 10:55 AM
Yeah, what he said.  ------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA & SS/MA National Record Holder '00,'01,'02,'03,& '04
First SS/MA in the TENS!
IHRA division 5 Superstock Champion
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28 The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
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