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Old 03-20-2012, 12:12 PM   #1
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First off im looking at 4.10's and the ford 28 spine tlok and was wondering what do y'all think the install price would be? I've heard between 300-800. If you have this set up please help me out and also let me know if the acceleration is really as badass as i've heard
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Old 03-20-2012, 01:14 PM   #2
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4.10's are really bad for highway driving, but you'll haul ***

---------- Post added at 01:14 PM ---------- Previous post was at 01:14 PM ----------

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4.10's are really bad for highway driving, but you'll haul ***
And yes I know I did nothing to help with your actual question haha sorry
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Old 03-20-2012, 01:18 PM   #3
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Re: installation estimate help

I found when I went to 3.73's and tried to build the 7.5 up that it ended up costing me more than it cost to swap to the 8.8 when I broke the 7.5 rear end with just a CAI, tune, and a pair of drag radials. The supposedly indestructible Richmond gears (that whined like crazy) weren't - bent the pinion within 8 visits to the drag strip.
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Old 03-20-2012, 01:43 PM   #4
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Re: installation estimate help

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Originally Posted by JimC View Post
I found when I went to 3.73's and tried to build the 7.5 up that it ended up costing me more than it cost to swap to the 8.8 when I broke the 7.5 rear end with just a CAI, tune, and a pair of drag radials. The supposedly indestructible Richmond gears (that whined like crazy) weren't - bent the pinion within 8 visits to the drag strip.
I've heard of a lot of guys blowing up the 7.5 with just mild power adders, some with only a 3.73. I think it's about your comfortable risk factor. If you can find a cheap junk yard 8.8 with higher gears, that's the way to go, but even that is expensive.

you might be safe with a 3.73 if you are just driving streets, not racing. There are some who have run 4.10 with posi dragging and never had an issue, but I wouldn't...

also, if you are an automatic, i've heard of people having trouble with low top speed...

---------- Post added at 01:43 PM ---------- Previous post was at 01:40 PM ----------

oh, and i did look into doing this myself once, I checked with several shops both big towns and small and ranged from $450 to $650. It's cheaper if you get the bearing kit and they don't have to mess with saving your old bearings (make sure you tell them when they quote you). Make sure whoever you take it to does a LOT of them, if they do a bad job, you'll tear it up.
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Old 03-20-2012, 01:54 PM   #5
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Alright thanks everyone for the input! Ill be sure to get the bearing kit. And I think im still just gunna stick with my 7.5 because somewhere in the semi near future ill be upgrading to a roush or gt. But ill take all the risks into consideration. I just want posi and alot more launch. I could care less for highway speeds because I drive a v6 mustang N/A... It'll never be a top end performer. I see what you mean by busting your 7.5 on drag radials, but I don't want radials for mine because I know under that pressure on a track the 7.5 is like wet paper.

Anyways so yall think in the 350-650 is doable?
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Old 03-20-2012, 02:01 PM   #6
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Re: installation estimate help

the top speed thing is more about # of gears, auto has fewer gears so they run out of top end. I've heard of guys not being able to get up to highway speeds, but i'm not sure what ratio they had on.

good luck! keep us updated!
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Old 03-20-2012, 02:06 PM   #7
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Quote:
Originally Posted by jamin22786
the top speed thing is more about # of gears, auto has fewer gears so they run out of top end. I've heard of guys not being able to get up to highway speeds, but i'm not sure what ratio they had on.

good luck! keep us updated!
Will do! Yeah and at the same time I've heard if you just push enough in the first 3 gears you'll be just fine up top
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