Posted by BADMAV (IP: 209.240.220.193) on December 20, 2000 at 18:05:48:
In Reply to: hold the ponies guyz... posted by Jason on December 20, 2000 at 13:35:25:
: okay.. i basically understand gearing. you know.. 2.89's.. 3.55's blah blah blah... but what is this talk of "posi units" and such?? i am still learning allllll i can about cars, and this is something i'm not sure i get. Thanks..
: Jason.
: p.s. i heard any 9inch out of a mid 50's ford will bolt directly onto my 74 4dr.. this true? and how does "nine inch" and "3.55's" coincide. Thank you very much!!
A posi unit or limited slip rear end means that both tires will spin at the same time instead of only the tire with the least resistance. Picture this: your car sits with one tire on ice the other on dry solid ground. When you try to move, the wheel with the least resistance ( the one on the ice) will spin and the one on solid dry ground does nothing. You dont move. With posi or limited slip, under the same conditions both wheels will spin and the one on dry ground will move the car. The 8 inch or 9 inch refers to the diameter of the ring gear in the differenal with the bigger gear being stronger and more reliable. A 9 inch Carrier will not fit in an 8 inch housing. About any 9 inch rearend housing will require some type of modification to fit under your Maverick. 3.55,2.78,4.11 these are gear ratio numbers. 8 or 9 inch refers to ring gear size. All size rearends have different ratios. The ratios are the same no matter the size of the rearends. I hope this helped you out