Any suggestions???

[slamd71]

I finally decided on a motor. Im Putting a 400M with just over 400 HP with a C6 tranny into my 71 F100 2wd that was originally a 300 straight 6. any suggestions or precautions I should take into consideration to make this swap go a little easier. I was told to leave in the stock rear end... Is this true?

[westernkansas]

sorry i was lost after "I finally decided on a motor"

[sideoilerfe]

You could build a killer 300 6 with the money you'd spend on a 400M. JMHO.

[ToughOldFord]

Personally I like the 400, it's an underrated engine IMO. But with gas prices the way they are I'd sick with the 300.

You'll need engine perches, I forget which ones, but Keith has an excellent write up on perches here.

To be engine correct you'd need to change the radiator support for a V8. Probably going to have to do a custom driveline. Your rear end should be fine unless you want to tweak the gearing to your liking.

[ToughOldFord]

Here it is:

Comparison Photos of Engine Perches

We don't say it enough, but kudos to Keith for all the time he's put in on this site.

[derek7871]

You might want to replace the front coil springs since you are going from a 6 to an 8. They are different because the 8 cyl. is heavier.

Cooter

[slamd71]

You could build a killer 300 6 with the money you'd spend on a 400M. JMHO.

Well I already have the 400 bought and paid for so the 300 is out of the question now haha

[19674x4]

just make sure you got the right mounts and in the right location. keiths writeups are excellent for this kindof project

[slamd71]

Thanks alot for the help guys!!!