from a 170 to a 250

[62cometblue]

Hello i am new to the site but have been a classic ford guy for a long time. i have a 1962 mercury comet and have had the car for the past 12 years and love it, the only problem i find with the car is the 2 speed trans and the 170,s lack of power, so i found my self a 250 engine and a C4 trans hoping to make it a better highway car. was just wondering if i'm headed in the wright driection and will my factory rearend hold up to the new setup. also what could i do to the 250 to max power but still keep it a good driving car?

thanks

 

[bmbm40]

Sounds good. To start out get a copy of "Ford Falcon Performance Manual" from classicinlines.com, it will explain a lot of what you want to know.

 

[bubba22349]

X2 "Ford Falcon Performance Manual" is a good first step.

i found my self a 250 engine and a C4 trans hoping to make it a better highway car. was just wondering if i'm headed in the wright driection and will my factory rearend hold up to the new setup. also what could i do to the 250 to max power but still keep it a good driving car?

I am a fan of the 250 & C4 combo it definitely will make it a better highway car. Will be doing that swap too, soon been on the hunt to find a good body. 250's are a tighter fit than a 170 or 200 in 63 down bodies but still doable. The answer is probably not on the rear end, you will be better off using an 8 inch rear like in the V8 cars and you should also upgrade the front end too V8 spec brake or go with disk's. Good luck on your build.

 

[62cometblue]

thanks for the help i will get myself a falcon pro man. i have been told that the mid to late 70's small ford cars are a good rear end and front upgrade to 5 bolt??

 

[bmbm40]

Actually for a highway cruiser you may want to consider an aod- if it will fit. I don't know much about them but believe they are plentiful.

 

[xctasy]

thanks for the help i will get myself a falcon pro man. i have been told that the mid to late 70's small ford cars are a good rear end and front upgrade to 5 bolt??

Plenty of V6 Pintos and most V6 Mustang II's and all M II V8's had 8 inchers which will do the trick. Not always Traction Lok, but you can get lucky.

You don't want a 6.75" diff on all 4 cyl and some V6 Pinto's.Plenty of M II V6's had it too, sadly. Useless, no locker options, and no real strength.

They are 4 on 4.25 studd, so you either drill and fill for 5 on 4.5, or clock 45 degrees and drill 4 on 4.5, and make sure the drum brake inspection hole doesn't weaken the flange.

The ratios you can find on http://www.mustangii.org/decoder/axle/