I just pickedup 2 Ford 9 rear ends. Tags are as follows: WDC-CA/275 7 mb 116 so this is from a Mercury with 2.75 gear ratio? WEB AD 2G9/ 275 9 812B so Cougor with 2.75 gear ratio? Now the information here:http://www.fordification.com/rearends-ford05.htm Says that they are 28 spline. But another website says that if it has a small hole on the end with two holes on either side by the lugs it's 32 spline. Is it possible that these were on trucks and hve 32 splines? Also I don't know anying about gear ratios. What type of driving is 2.75 good for?
2.75 gears are for cruising, and gas mileage, not performance. The 28/32 spline thing seems to have no logic to it, I've seen six-bangers with 32's and big blocks with 28's. Whatever came down the slide, I guess.
Ok thanks one rear end is for me and one is for a buddy. I live 7 Miles from work and want to use my truck sometimes. Not a DD all the time but cruising around so 2.75 is going to be OK for me. MY buddy is a quarter mile guy so he may want to change gears. I got these for 50 bucks each. Good deal?
I think you might mean 31 spline? 2.75 is a highway gear. Had a set in a mates Falcon with a 302 Clevo. You had to leave it in 3rd at 60 to keep the revs up.
Yes, it's possible - in the '60s, that's generally a good rule of thumb - three holes horizontally is usually 31-spline, a big open double-D type hole is always 28-spline. Once you get into the mid-70s, nearly all of them were the three-hole style & used the big bearings, but most were tapered down to 28-spline. Here's another website with lots of 9" info: http://www.kevinstang.com/Ninecase.htm
$50 is a good price. But it pays to find one with the width and ratio you want. Narrowing a rear end to fit is not particularly expensive. But you can spend close to a grand having a professional shop change the ratios in your pumpkin. With a 2.75/1 ratio you need to watch your tire size closely. Best behind and automatic transmission.
Well I was planning on using a 302 that a friend gave me and a T5 trans. As far as tire size what would you recomend?
A little confused. I am an idiot when it comes to this stuff can you help me out? Do you it's going to take a long time to get up to speed?
With an auto in it you'd have a bit of 'slop' in the converter, which makes a 2.75 gear feel normal. With a manual, you'll find the engine doing ( I'm guessing ) about 1100 rpm in 5th at 60 Mph. I don't think a little 302 would cop it. Maybe a 500 Cad. If you are going to run tall tyres, it'll make the situation even worse. Personally, I like about a 3.5 to 3.7 ratio
I may consider that if I can't find one around here. I am going back out this weekend to look through the pile again. Thanks for the help.
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