M-38A1 QUIZ-HOW WELL DO YOU KNOW THE M-38A1?

[idiocrates]

I can't wait to find out the answer. He said, "one minor obvious and very visible detail that is still M-38 that could not be changed"......obvious to me means visually obvious....so its something that can be seen....minor means its probably something pretty small or maybe inconsequential.....very visible again means it can be seen on the outside of the axle....which rules out things like spline counts.....whether or not there are inner seals.....and finally cannot be changed.....that means it couldn't be something that could be added or ground away or modified. Sheeesh.....maybe it has something to do with a difference in the location or size of the reinforcement webbing around the pumpkin?....I thought maybe the carrier bearing cap screws where they are visible on the front of the pumpkin might have been like 7/16 verses a 1/2...but that's not right....maybe the cover cap screws were differnt.....but that's not right.....different id tag info.....but that's changeable...and the same anyway.....I give up......what the devil is the answer? And you can darn sure count on the fact that I'm going to compare the answer to the rear axle mounted under the a1 I'm working on......I've always suspected it wasn't original inasmuch as it had an all together different paint scheme on it. I am just like all adither waiting for the answer.

[modified]

one last crack. the drive line angle on the rear axle differs to the 38A1. hence. the spring's perch axis relative to the driveline level.

[Joe Gopan]

Both axle housings are same part number the specs are the same. It will be easier next episode, maybe tonite.

[Cuz]

OK here we go.

As Joel said the axle housing are the same.The only housing part carrying different part numbers is the upper tube relief valves which on the M38 are ORD# 587310 (1500PSI) and on the A1 are 587305 (4 PSI). The only part of the input pinion pieces sticking out the front of the housing that are different are the washer under the pinion yoke nut which is ORD# 7372868 on the M38 and early A1 and 221442 on the late A1. He has already swapped out everything on the outboard ends. So the drum to drum appearance will be identical to a stock A1 housing with drums installed. That leaves the date code and possibly a few foundry marks.

[idiocrates]

and he said.....that could not be changed. I would think the flat washer under the nut and the vent riser could both be changed so I elliminated that from the competition. Me thinks maybe he has an axle with a chunk of cast iron hanging on that I don't got......hehehe.....oh wait....my axle is a half-breed sumptin or other...or maybe a quarter-breed by the time I got through rebuilding it....so how would I know?

[Joe Gopan]

This is why I bailed out of the topic, those relief fittings listed for the M-38/M-38A1 were never rated 1500 Psi, but were a 4#. Actually they are a 1#Min, 5# Max. Trying to reason the releaf valves oit is very confusing. This could go on forever. One can remove the fitting from both type Jeeps and clean the top up and read the rating. 1500# would be suicide for the seals. I had a prob when posting the orig quiz, my reading glasses were at the Optometrists and I was having severe pain due to a health prob and my eyes were watering. The Quiz did not come out as intended.
Watch for the next episode, maybe tonite.

[Cuz]

Here we go.

The topic change deal! Not because of an error but because of a missing set of glasses!

I thought for sure you wouldn't be able to explain the ORD 9 misnomer for the valve rating which was suppose to be 1-5 PSI.

[Joe Gopan]

That's enough, Cuz.

[modified]

Do the Relief valve differ on the rear axle cover?

actually, Does the M38 cover have baffling on the inside as opposed to the 38A1 ?

SO WAS THIS the correct answer... the relief valve ?

[Joe Gopan]

Actually the Gizmo on the cover of Jeeps is a Vent and designed spicifically to hold no pressure. If one were to take the Cap off one would discover a felt, the only purpose of this vent is to prevent Water and Dirt from entering. Other types of equipment will have Vents designed to retain pressure and a ball and spring will be inside, but not the Jeeps.

[Cuz]

The two relief valves (one at each upper outboard end of each tube) are different. The vent fitting on the rear cover is the same on both jeeps.

[53a1]

One has a tail the other is a manx. Mine has the runs.

[Joe Gopan]

I like your answer, you're in the running.

[Joe Gopan]

NEXT ROUND
M38 has an M-38A1 Transmission and Transfer Case installed, the Parking Brake components and Transfer Case Rear Bearing Retainer have been changed to M-38 components. How can one tell the transfer case from that of an M-38?
NOS M-38/M-38A1 Prize Waiting for first correct answer. Choose from several G-758/G-740 items.

[M38A1 MP Jeep]

Is one marked Spicer-Lipe and the other not?