F150 4x4 with an FE ???

[havi]

If anyone has a '73-77.5 F150 4x4 frame, I would like to know the distances between centers on the top bolt holes for the frame perches. Thanks.

I measured a highboy F250 and came up with 2.5" center to center. I'm curious to know if the half-ton is different or if they use the same bracket?

 

[John in AZ]

1/2 ton should be the same. Frame widths for the high boy is different for the back end only as I recall. from front cab mounts same as 1/2 ton

 

[BKW]

If anyone has a '73-77.5 F150 4x4 frame, I would like to know the distances between centers on the top bolt holes for the frame perches.

I measured a highboy F250 and came up with 2.5" center to center. I'm curious to know if the half-ton is different or if they use the same bracket?

1977.5 (not Ford terminology) only refers to High Boys, and is derived from serial number Y20,001 which occured mid-model year (February) 1977.

The last F250 4WD (High Boy) was assembled before serial number Y20,001. F250 4WD's assembled from serial number Y20,001 are not High Boys.

The only V8 factory installed in 1968/76 4WD's was the 360 2V.

 

[havi]

Agreed, Bill. I measured the 2.5" from a 1976 f250 4x4 w/360. I'm curious to know if the F150 is the same or not. I do know it's different than the 1978/79's 3.38" for a 300 6, and 4.25" for the 351M/400. I suspected the FE in an F150 was changed to the 351M/400 around the same time frame as the highboys end of run, thus I lumped the years into the same.

EDIT: I should add that even though they show different part numbers in the '73-79 master parts and accessories catalog, they do not show the dimensional differences. So I know there are differences between the years, just not the bolt hole measurements.

 

[BKW]

First year for 351M/400's in F100/350's: 1977 (new trucks introduced September 1976).

Last High Boy assembled February 1977.

 

[havi]

1/2 ton should be the same. Frame widths for the high boy is different for the back end only as I recall. from front cab mounts same as 1/2 ton

Looks like you're right.

I have '73-76 D6TZ-6028-A for the right, and C6TZ-6029-E for the left to hold a 300 6 in both the F100 and F250 in a 4x4.

I have '73-76 C6TZ-6028-D for the right, and C6TZ-6029-F for the left to hold an FE in both the F100 and F250 in a 4x4 (exc. crew cab)

It appears both have bolt hole centers of 2.5" and only change frame locations to mount either engine. But why does the 300 have one perch(C6TZ vs. D6TZ) different than the FE for these years?

Secondly, the pre-20,001 SN for 1977 for the 300 has the same right hand perch C6TZ-6028-A, but now has a new left hand perch: D7TZ-6029-C, and after the SN 20,001, and throughout '78 and '79 the numbers go all over the place, both perches being at least from 1976 on up. Somewhere in there the perch bolt holes changed to 3.38", which is what I have put in my 1979 Bronco..... I don't recall the year those perches came from, and so when I put an ad out, looking for a pair of perches, I want to make sure I have the right ones. Clear as mud? (in case someone offers me a set from 1976 that I'd want to install in my '78, or vice versa)

Lastly, the 351M/400 brackets have a 4.25" bolt center in my '79 Bronco and '78 F150 4x4. So when someone swaps in an FE into these year trucks, do they use those same perches, or do they use the FE perches, and drill a new hole, and if they do, which hole do they use?

I've always read that there's an inch difference between the FE and 351M/400 but I don't know where that inch is.

 

[BKW]

I have '73-76 D6TZ-6028-A for the right, and C6TZ-6029-E for the left to hold a 300 6 in both the F100 and F250 in a 4x4.

I have '73-76 C6TZ-6028-D for the right, and C6TZ-6029-F for the left to hold an FE in both the F100 and F250 in a 4x4 (exc. crew cab)

It appears both have bolt hole centers of 2.5" and only change frame locations to mount either engine. But why does the 300 have one perch(C6TZ vs. D6TZ) different than the FE for these years?

Secondly, the pre-20,001 SN for 1977 for the 300 has the same right hand perch C6TZ-6028-A, but now has a new left hand perch: D7TZ-6029-C, and after the SN 20,001, and throughout '78 and '79 the numbers go all over the place, both perches being at least from 1976 on up. Somewhere in there the perch bolt holes changed to 3.38", which is what I have put in my 1979 Bronco..... I don't recall the year those perches came from, and so when I put an ad out, looking for a pair of perches, I want to make sure I have the right ones. Clear as mud? (in case someone offers me a set from 1976 that I'd want to install in my '78, or vice.

All these fracatta part numbers can be confusing, doncha think? If so, be prepared for more confusion, because...

C6TZ-6028-D replaced: C6TZ-6028-B.

D6TZ-6028-A replaced: C6TZ-6028-A & C6TZ-6028-C.

C6TZ-6029-F replaced: C6TZ-6029-B & C6TZ-6029-C.

D6TZ-6029-A replaced: C6TZ-6029-A & C6TZ-6029-E.

Ford is in-famous for replacing (updating) 10's of 1000's of part numbers EVERY year!

If y'all think...all I do is look in the parts catalog, find the number, then post it, you're mistaken, kiddos.

I have to look in multiple O-S-I Catalogs first to verify if the number was changed...or not before I post it. Then I have to list all the replaced numbers along with the newest number.

O-S-I = Obsolete-Supercede-Interchange, and... Speakin' of the 300 I-6, Ford changed the exhaust manifold part number eight times between 1965 and 1983. I kid you not!

 

[havi]

No doubt, Bill, I know you can always make sense of all of this. I only have the hipo CD which dates everything around 1980. So I look at all of these numbers, scratch my head, and think to myself, "I'm missing something here, lol".

Thanks for putting these parts into perspective.

 

[Mil1ion]

wrong image

 

[havi]

Do I dare say the 4x4 perches between a 300 and FE are different altogether? Fordification shows a picture of FE 4x4 perches. It doesn't say FE/300 4x4 perches. On the other site, somebody posted 0<--2.5"-->0<--4"-->0<--3.25"-->0 for his '74 crewcab 4x4

My '79 Bronco is as follows: 0<--3.38"-->0<--4.25"-->0

I can't say ours start at the same end.

If the perches were supposed to be interchangeable between 300 and FE, the bolt holes should have been an equal distance at 2.5". So I dare say they are different for the 4x4's. Same for 2wd's only. This also means everything I had planned is thrown out the window.

Can anyone elaborate on this?

PS: I found the inch difference is in height only, so it makes sense the FE could be dropped into a 351M/400 4x4, only the FE will sit an inch lower and the oil pan might be pan issue, along with having to change the transmission mount and tcase to side rail mount.