302 to 250 swap/ plus tranny.

Moderator: Mod Squad

User avatar
Invectivus
Registered User
Posts: 366
Joined: Tue Nov 27, 2007 11:41 am
Location: Morgan Hill, CA

302 to 250 swap/ plus tranny.

Post #1 by Invectivus » Sun Jul 16, 2017 12:19 am

So, my bronco has a v8 with a smoking problem. Probably, maybe. Anyway, I was considering building up one of my 250s and transplanting it in. Recognizing the different sump pan needed, I have three main questions:
1. Will a 250 tow a camper trailer better than a 302, or vice versa, recognizing you can cam both for hauling.
2. I hear there are different core/radiator supports between straight and bent engines. What's up with that and is it a concern?
3. I want a great auto, it's a c4 now. What are the good auto tranny's for towing?

I plan on efi either way, for mountainous driving comfort.
1967 mustang coupe - 200ci, 69 dizzy, adjustable rockers, headers and dual exhaust, T5.

1964 convertible falcon - Gutted.

1973 EB Bronco - 302ci (sorry!) DUI ignition, C4/D20, Dana 44, 33's

jimmyv65
Registered User
Posts: 85
Joined: Sun Aug 26, 2012 4:29 pm

Re: 302 to 250 swap/ plus tranny.

Post #2 by jimmyv65 » Tue Jul 25, 2017 8:23 pm

Hi,

Not a lot of traffic out here this summer. Sorry you aren't getting feedback. I can't speak to towing much, but will add this.

My 250 with FI feels strong enough to tow. With a carb it did not. I seem to be a lone voice on this, but the 2bbl adapter plate is a horrible thing. It puts the float bowls sideways. That caused me all kinds of issues. So, stay EFI.

Have you considered the 300? In hindsight, I would have gone with the 300. You can get an already efi'd 300 pretty cheap from a mid-90's F150. They had a decent factory auto and I am sure were used to tow a bunch.
1966 Bronco-'78 250-Meagsquirted TBI, DUI, Header, Cam, Hydroboost & Front Disc, Uncut, 1" body lift, 2.0" suspension lift

bmbm40
Registered User
Posts: 1074
Joined: Tue Feb 22, 2005 6:25 pm
Location: Carson City, NV

Re: 302 to 250 swap/ plus tranny.

Post #3 by bmbm40 » Tue Jul 25, 2017 8:36 pm

I would definitely stick with the 302 and use a torque cam with a rebuild. If I had a v8 Bronco I would want an aod/aode or similar 4 spd auto. As you know your tire size and gearing will be a factor. In my opinion the 302 rebuild will be way easier and cheaper.
66 Bronco-1970 250, NV3550, DSII, 4 turn ps, uncut, 1" bl, 2.5" sl, front disc, twin stick D 20, 30 x 9.50
NEXT- direct mount 1.08 on D8 head, power brakes, rear limited slip, 3G, electric fan, electric upgrades, custom curved DSII, header, 31" tires

New guy? Get the Falcon Performance Handbook and Ford six high performance parts from https://vintageinlines.com

66WarPony
Registered User
Posts: 87
Joined: Tue Apr 24, 2012 3:36 pm
Location: Oak View, CA

Re: 302 to 250 swap/ plus tranny.

Post #4 by 66WarPony » Wed Apr 25, 2018 9:24 pm

bmbm40 wrote:I would definitely stick with the 302 and use a torque cam with a rebuild. If I had a v8 Bronco I would want an aod/aode or similar 4 spd auto. As you know your tire size and gearing will be a factor. In my opinion the 302 rebuild will be way easier and cheaper.


If you want a better auto tranny, get a 4R70W, remove the electronic solenoids, and get a manual valve body. The guys at Lentech Automatic can give you more info, but one design that makes the 4R70W better is than an AOD/E is that the top of the valve body is not open, which means that sediment from wear doesn't fall into and settle in the valve body. This makes for greater longevity and the cost to build/rebuild one is the same. The 4R70W is also a later version of the AOD/E, and is plentiful.
Present: '89 Bronco XLT, 302 (no I don't like it, I'm just stuck with it at the moment), Bassani Shorty's, 4" Lift, 33" Grabbers

Upcoming: Hoping to get back in the EB game if the opportunity presents itself

"If you want to know about something, read a book." - Dad

Who is online

Users browsing this forum: No registered users and 1 guest