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MG MGB GT V8 Factory Originals Technical - Limited/Locker/Posi

I need one of the above in my evolving Ford 8" rear end
What do you have and do you like it. People want new prices for used parts so I might as well buy new. Also
what is the best in your opinion for the rear end ratio
on a Rover .82 fifth gear. Thank you. Denny
dbw morris

Do you have any swap meets out in your area?? I have been told those are the best places to get parts. Once people get them there they don;t want to have to haul them back home...

With a .82 OD I would think you want 3.00 range for your rear axle, depending on tire size.. being that low 2.73 might even be usefull... Not sure what engine you have, but for my EFI car, I know it does not like to be cruise ~1500rpm because that is very close to the high idle of the ECU.. I was going to go 2.73's with my .675 OD, but it was to close to that 1500 so I am going 3.08's..

This is in a Ford 8.8 Rear..

They are not cheap but a Air locker would be a cool feature. Unless you are "playing hard" how often to we really need the locked rear end?? that way if you want to play all you have to do is flip a switch and she is locked, then flip it back to return to normal diff action...
Larry Embrey

I had an Auburn limited slip installed in my 8" Ford. Gearing is 3.27...I have a T5 with 0.63 final drive. This was a new unit and was installed by Fast Cars, Inc into my shortened diff housing. I have the 2.79 non-LSD gears available if you need them. They came out of a 1979 Ford Granada.

I've not yet driven the car, so I cannot comment on its performance.

FWIW

rick
rick ingram

My car has the 3.9 Rover motor,with 195/70/14 tires. Larry I got the 8" for $25.00 and its the maverick which is only 56" wide. I still want to have it shortened because it will be cheaper than buying new wheels. Rick I will contact fast cars and see what it will cost to put the rearend altogether. Thank you. Denny
dbw morris

When you're deciding on a "posi" unit, you need to consider how you plan to use your car. When you go around a corner, the outside wheel needs to turn faster than the inside wheel. If you have one of the locking type, either air locker or one of the clutch type, both wheels are locked together and are forced to turn at the same speed. If both wheels turn at the same speed, there is a strong tendency to drive the car in a straight line. Great at the drag strip, but not too cool on a road course.

For road usage, you need one of the "torque biasing" type, such as a TruTrac or similar. These type operate with gears, and allow the wheels to turn at different speeds while still applying torque equally to both.
Dan Masters

Great point as usual Dan!

dbw - $25.00 is a STEAL!!! I would agree 100% with Dan's comment, you need to look at how you drive the car. Will it be a daily driver, drag car, road course car..
Larry Embrey

It is a car that is driven in the warmer times only.
I want the posi for traction. I also want to lower my rpm's on the highway. And also for burnout's, they look cooler with two tire's burning unstead of one.
So Dan would the posi that came with all the old Ford
Muscle car's be alright. Denny
dbw morris

Denny,

I'm not sure what type came with the old Ford muscle cars, but I would imagine it would be the same as the old GM muscle cars, which was the clutch type. They might be suitable for the street, depending on your driving style. If you reserve your "hot rod" tendencies to the "stop light Gran Prix" you should be allright. However, if you do a lot of "hot shoe" driving around the twisties, you may have problems. Applying a lot of tourqe to the diff coming out of corners would lock it up, causing understeer. If you wait until you're out of the corner to get on it, you should be OK.

Based on my limited experience with them, it takes a lot of torque to lock them up, so unless you are driving harder than you really should be on public streets, you shouldn't have too much trouble.

Keep in mind that I'm strickly an amateur, and don't really know what I'm talking about. I would advise doing some research on the web, and forget about whatever I've said. I'm only repeating what I've read myself. Based on my research, and converstions with the pros at Currie, I chose a "TruTrac" for my TR6, a gear type. Currie sells all types, so I assume they were being straight with me, as they had no reason to push one over the other.
Dan Masters

This thread was discussed between 13/03/2005 and 18/03/2005

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