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12-04-2012, 07:11 AM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
Ummmm excuse me girly men!!
4.10s (or 4.30s) would be a hell of a lot more fun and are the only possible choice for that motor/trans! 
Jason |
12-04-2012, 04:04 PM
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CC Member
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Join Date: Feb 2009
Posts: 1,696
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Not Ranked
Quote:
Originally Posted by D-CEL
Ummmm excuse me girly men!!
4.10s (or 4.30s) would be a hell of a lot more fun and are the only possible choice for that motor/trans!
Jason |
I had 4.56 rear gears with a T56 and it pulled about 2100 at 70mph. Unfortunately, 1st gear topped out at about 20 mph. I'm down to 3.73's now. |
12-04-2012, 08:16 PM
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CC Member
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Join Date: Feb 2005
Location: Perrysburg,
OH
Cobra Make, Engine: SPF #298 427 FI
Posts: 497
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Not Ranked
Quote:
Originally Posted by D-CEL
Ummmm excuse me girly men!!
4.10s (or 4.30s) would be a hell of a lot more fun and are the only possible choice for that motor/trans!
Jason |
Agreed, I went from 3.27 to a 3.73 and wish I would have went 4.10. If your going to change make it worth while  |
12-05-2012, 06:03 AM
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CC Member
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Join Date: Nov 2001
Location: Windham,,
Me
Cobra Make, Engine:
Posts: 1,590
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Not Ranked
Quote:
Originally Posted by D-CEL
Ummmm excuse me girly men!!
4.10s (or 4.30s) would be a hell of a lot more fun and are the only possible choice for that motor/trans!
Jason |
Good one D-Cel, had a set of 4;11's in a big block Chevelle when most driving was around town and only lived 3 miles from work.Loved it then,now it's almost 40 miles to work and this big block Ford is very happy with the grunt 1st gear of the Tremec and 3:70 cog.Row this thing out of 5th back into 4th and hang on.Gave the gear change in this car a lot of thought.
Last edited by mdross1; 12-06-2012 at 05:45 AM..
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12-05-2012, 07:33 AM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
Remember this is not a 9 inch or a Jag, it’s an 8.8 and God loves them! They are strong, efficient and ridiculously cheap! I bought another complete 8.8 center section for under $100 and a used set of 4.10s off of eBay (I think they were $60 shipped!) and having it set-up was about $175? (Out of the car) R&R it in a couple of hours and you’re good to go. And you will have your orig. center section as a spare or sell it off to recoup some of the cost.
When you have an over driven 5th, 4.10 + gears are perfect. Mine has a .68 and spins about 2400@70-75. Puts the motor into the power band and makes 5th more useable.
Once you go 4.10, you’ll never go back! Lol
Jason
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12-05-2012, 08:01 PM
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CC Member
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Join Date: Aug 2009
Location: Adelaide,
SA
Cobra Make, Engine: AP 289FIA 'English' spec.
Posts: 13,152
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Not Ranked
Quote:
Originally Posted by D-CEL
When you have an over driven 5th, 4.10 + gears are perfect. Mine has a .68 and spins about 2400@70-75. Puts the motor into the power band and makes 5th more useable.
Once you go 4.10, you’ll never go back! Lol
Jason
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With a rear end that low, do you always start from rest in first gear, or do you use second?
Cheers,
Glen |
12-06-2012, 07:03 AM
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CC Member
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Join Date: Dec 2010
Location: Allen,
TX
Cobra Make, Engine: Werk77 289FIA
Posts: 1,296
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Not Ranked
Quote:
Originally Posted by D-CEL
Ummmm excuse me girly men!!
4.10s (or 4.30s) would be a hell of a lot more fun and are the only possible choice for that motor/trans!
Jason |
Jason,
still grinning about that commend hahaha.
Yes, 4.10 are great gears to wake up small blocks. If I like to cruise with 70mph and 1500rpm ---- I take the Suburban 
__________________
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SPF 2063
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12-06-2012, 08:43 AM
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CC Member
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Join Date: Jan 2005
Location: Rancho Cucamonga,
ca
Cobra Make, Engine: SPF 239
Posts: 820
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Not Ranked
I laughed when I read “gears that low”. I’ve been running (and recommending to friends) 4.10s in Mustangs for years. Most had the same view point, until they drive with them. I would say “low” gears starts at 4.88 and go up from there.( I once saw a set of 7.33s for a 9”)
Actually 4.10s are much easier to live with everyday. The added toque multiplication makes coming out of the hole a snap. You can just about dump the clutch without adding throttle and it won’t stall. No need to slide the clutch to get it rolling. They naturally idle thru parking lots at idle rpm. It’s just an all around good deal. They make the car snappy and ferocious….just like a Cobra should be.
The “4.10 is too much gear”myth was born in the days of 1-1 top gears, 5000 rpm max, hydraulic lifter motors and E-70-14 tires (25” tall).
That combo with 4.10s @ 65mph would have the motor was buzzing along at about 3600 rpm (73% of max)and a blinding top speed of 90mph. Dropping the gear all the way down to a 2.73 would put the 65 mph rpm @ about 2400, you could live with that every day. But at the expense of 35% less available torque (give or take) that is a huge number in a “torque challenged” small block car.
Times have changed.
The simple swap to an over driven 5spd makes all the difference. A .64 high gear and 4.10s puts the 65 mph rpm @ 2300. Add a set of 295-50-15s and it drops to 2195.
Jason
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