On 1973/79 F250's for example, there were FOUR different GVW's: 6100, 6900, 7500 and 8100 lbs.
that is just some of the available gvws? or are those the base gvw and there were options to increase it?
one of my 77s has a gvw of 7700lbs the other 77 has a gvw of 8200lbs and my 78 has a gvw of 8400lbs. none of those numbers were litsed preiviously so i'm just curious how they got to those numbers.
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Untill next time, I leave you with these words of wisdom...
that is just some of the available gvws? or are those the base gvw and there were options to increase it?
one of my 77s has a gvw of 7700lbs the other 77 has a gvw of 8200lbs and my 78 has a gvw of 8400lbs. none of those numbers were litsed preiviously so i'm just curious how they got to those numbers.
Those four GVW's (6100, 6900, 7500, 8100 lbs.) are what is listed in the 1973/79 Ford Light Truck Parts Catalog for F250's.
There could be more...these are the ones I'm most familiar with, as they are needed to get the correct "Brake Differential Proportioning Valve" for 1975/79 F250's.
You'll need this parts catalog to find all the various GVW's, as I do not know where else they can be found.
To find out what the correct GVW is, either look on the Warranty Plate, or post the MODEL code off the Warranty Plate. I can decode the MODEL code.
In fact, I can type all the GVW's for all the 1973/79's...but...I'd rather not, as there are myriad different ones.
The first three digits of the VIN itself doesn't tell much of anything when decoded.
__________________ Bill / Retired Ford Partsman (1962/97) / SoCal Chapter Member.
Part Number Research: Trucks: 1928/2000 // Cars: 1928/79.
The 73-77.5 F250 4x4's i.e. "highboys" have a ladder type frame and an additional crossmember under the front bumper which inherently makes them stronger by the very nature of their design when compared to the 77.5-79 F250 4x4's i.e "lowboy's" frame, it's just my opinion and others may disagree but i'm standing by it.
300,351M,400 are the stock engines from 77-79. Swapping in a 429/460 is a fairly well documented engine swap with aftermarket support. 351M/400 are identical blocks.
300 and 360 were pre-77 4x4 engines. 360 has identical block to a 390. Swapping in a 352,390,410,427,428 in place of a 360 is simple.
Stock differential gearing in F100(150) should be roughly 3:50 F250 would be 4:11. If you drive at Freeway speed, that makes for some high rpms.
That so called mechanic doesn't know his *** from a hole in the ground!
There is NOSUCHTHING as Midland inre to the 351M...PERIOD!
Where exactly in Midland TX is there any Ford assembly plant? There is exactly N-O-N-E = NONE!
The M stands for MODIFIED, and has since the engine debuted in the following 1975 passengercars: LTD, Torino, Mercury Marquis, Cougar.
Since you have made this claim as an absolute would you please produce the Ford documentation PROVING it. because it's NOT true.
There is NOT a midland TX ford plant but there IS a midland MI, which did have the casting plant that DID cast the origninal 351m/400 blocks and if you follow most of fords engine designations for 351s basing it on the cities associated with the engine (iwndsor and cleveland to be exact) Midland actually makes a LOT more sense then modified. So without proof it's just an M, but I have known Ford engineers just like you have and they claim midland, others claim modified. The "experts" would say anyone making the claim of it standing for "modified" is a so called self proclaimed expert with no knowledge or proof.
This is one of those arguments that can not be won because there is no verifiable proof so anyone making a definitive claim of knowledge is wrong, no matter who or what their claim is.
so, is there much difference in performance between the 2 engines? is one 'better' than the other?
Well the 400 of course has more CI so theoretically should have more hp. I think the 400 has higher compression as well. The compression is still pretty flippin low though.
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