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Old 02-28-2005, 03:47 AM
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keep er or chuck er

MY Q is i have a 70 mercury cougar with about 400 horse and 417 foot lbs of torque, an FMX tranny , and 2.79 rear gear .... and yes no posi or limited slip. What should i do put a limited slip in it or cause its so highway geared, change the rear gear and make it hook both tires ? On the other hand its a good strong 9 inch rear end , but with all the things i want to do mabe it would be beter to find another rear end and swaup the hole thing ?

Any help would be greatly apprecaited

thanks bill

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Old 02-28-2005, 04:33 PM
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If it were mine, I would pull it out, take it to the pros to find out what gear options are available with limited slip and go with their recommendations. Be sure to tell them what tranny you have and what you expect from the car.

Trees
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Old 02-28-2005, 05:45 PM
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I would find another center section with limited slip and a lower gear. The nice thing about 9"ers, you can have extra carriers ready to swap without having to go through the hassle of setting up the gears.(NASCAR style) If for some reason you wanted to drive the car across the country you could always put the high gear back in, for the milage. Be sure to match spline counts.
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Old 03-01-2005, 02:48 AM
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Well i took your advice trees and i asked "the pros" and they gave me a price on a 3.05 gear and a rebuilt posi, seals and labour for about $700.oo
Now im not sure but does that sound reasonable. I have no basis for compairison. He also told me i should mabe consider making the rear springs well he said something about pinching the front half of the springs to iliminate leafspring wrapping . If you mabe know what he ment by that then how much would this cost aswell?

thanks alot
bill
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Old 03-01-2005, 02:52 AM
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spring wrap

Spring wrap is no problem unless you are getting wheel hop. If you do I suggest SSM lift bars. They will stop wheel hop and change the instant center of the vehicle at the same time.
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Old 03-01-2005, 03:00 AM
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Ok... bracketeer .. what exacticaly are these " ssm lift bars" and how can i get them and how much? And having not really put my foot into it yet , i'm not sure if i have this problem. I have wicked hop in my truck, perticularly when backing up .. it shakes the hole back of the truck (like an earth quake)

thanks guys , keep the answers flowing
bill
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Old 03-01-2005, 04:18 PM
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Match your gears to your motor, I wouldn't run anything lower than a 3.50 behind a well built 4V C personally, but thats just me. I also perfer the Detroit Lockers over clutch style LSD's, stronger and they never wear out.
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Old 03-01-2005, 06:46 PM
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Cougar, that sounds about right for new gears, bearings seals and limited slip + labor for set up.

Trees
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Old 03-02-2005, 03:56 AM
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Ok then thanks trees for the price check! and .... a detroit locker will never wear out hmm that sounds good but on the other hand i hear that if i want to do any road driving that its a good idea to have the option of letting one tire free wheel. Dont get me wrong i want to howl on both tires for a smokey earth shatering burnout but .... i want to have a nice ride on the highway.

bill
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Old 03-02-2005, 12:53 PM
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Thats what a Detroit Locker does... It's not a spool, its just a mechanical locking diff instead of a clutch type diff. I've had my fill of replacing worn-out clutch diffs already.
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