Hey Blue Oval Community, I'm back and I'm needing help with identifying my truck as a potential late-production Highboy. The vehicle was manufactured at the San Jose Plant in July of 77' (which exceeds the last production month for Highboy's by 5 months). It's equipped with a 351M, a 4-speed manual transmission, divorced transfer case, DANA 60 rear axle with a DANA 44 front axle with open knuckles, rear drum brakes with front disc brakes, power steering, no A/C, and 16.5 stock rims. The only counter argument I have against my hopes are that the gas tank is separate from the cab and towards the rear of the bed, and that I really haven't measured the frame of the chassis. Any input would be appreciate, thanks! Hope the pictures can help:

 

Lowboy most the way. Steering gear with pitman arm, low front and rear leaf spring count, gas tank between the rails, No in cab gas tank, rear cab mount on the rails. The only perplexing issue is the transfer case. Look at your support and see if it has been moved to adapt a divorced case. Also highboys came with the low pinion Dana 44 rather than the high pinion which I cant tell on the pics.

 

In a half hour, I can send a few more pictures regarding the transfer case and the front axle. Does the internal input shaft matter? When I changed the oil it was a hypoid gear, I didn't know if the gear type matters.

 

Here are some additional picture of my front cross member, front axle knuckles, transfer case, and rear leaf springs. Not the most familiar with auto tech, pretty much a newbie. Hope it helps. From all of the comments it's most likely a low boy. I'm just puzzled about the transfer case. Thanks!

 

Married transfer case...........NOT A HIGHBOY

 

Married? It was my understanding that divorced transfer cases were separate from the transmission and joined by bolts and a gasket, while married transfer cases were casted with the transmission. Might just be me getting the differences mixed up.

 

Married transfer cases are bolted to the transmission, divorced transfer cases are mounted separately and have a driveshaft between the transmission output and the transfer case input.

 

Yip Lowboy all the way

Below is a divorced transfer case

 

Easiest way to determine this (other than what we've already told you) is to measure the distance between the frame rails. Highboy's had a more narrow frame, I think it's 33" instead of 37", or something like that...search it.

This example is NOT a highboy, note the married Tcase:




This is may or may not be a highboy, but this is an example of a divorced Tcase (not the short drive shaft):

 

X2 all the answers above.

Looks like you have a married (not totally separate/divorced) xfer case). NP-205 I bet look at the shift pattern or the silver blue tag on the front of the case.

Factory looking rear fuel tank='s lowboy.

 

Pic: 1973/77 F250 4WD (High Boy) showing divorced transfer case.