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  1. C

    M939 series diffs

    Correct, i figured that much. The solenoid is engraved, 1, 2 and 3. As previously stated, ports 2 and 3 are, with no elec applied, out of the box, are ported/linked together. I blew in port 1, had no air flow, i took another breath, blew into port 2, and heard air out of port 3. I blew once more...
  2. C

    M939 series diffs

    @simp5782 You got a wiring a d plumbing schematic for the above mention temp switch and air solenoid? The solenoid has 3 ports, line in, line out but cont figure the 3rd port. Ports 2 a d 3 are open together. Is port 1 line in, when 24v applied, port 2 becomes line out, closing off port 3...
  3. C

    M939 series diffs

    True, and i think there something to do with a spacer too ad possibly the bellhousing itself. I wont know till i try it. I did find a 13spd for $2500 locally, which im sure its gone by now. But we have a big truck salvage yard up the road, i could maybe “rent” it, bolt it up with no...
  4. C

    M939 series diffs

    Im gonna copy some of the manual swap that someone did on an A0/A1 and go with either of those spd ranges. Im fin to pour a slab between my conexs and wall it in, so with the cab, wrecker bed and hood off, i should be able to roll the spare truck in/out with minimal effort, even moving with my...
  5. C

    M939 series diffs

    @simp5782 i am striking out on find a solenoid. i found them once, had the link open and accidentally closed the all the web pages, and my computer was acting stupid, and couldn't open last closed pages. i hadn't thought about it till now. you got a link for the air solenoid?
  6. C

    M939 series diffs

    I have a normally closed. 30-45 sec, maybe a min, after the eng is running, the fan kicks on. Well, i do so happen to have my stock turbo off my 06 dodge 24v cummins after i upgrade to a 80mm turbo. Ill mess with the fuel, but first drill and tap the manifold for a pyro probe to get a base...
  7. C

    M939 series diffs

    Yes sir, A2. What the heck is the aneroid? Negative, i have not messed with the fuel. I need to do an elec/air temp switch to fix the fan from staying on all the time, now that iv got cooling system, according to a temp gun and the gauge, running at or below 200, while driving it on the back...
  8. C

    M939 series diffs

    With 14R/20s, that thing is a turd off the start. I havent put my 395s under it. Thanks for the reminder. I need to order 14 orings from that website you linked me to for the rims. I was planning on breaking all 7 395s down, putting them on my current 5tn rims on the tck. But work decided i need...
  9. C

    M939 series diffs

    Why would i not want to go much below that? Would the T-case cause the ratio to become even taller, causing the RPMs to drop drastically once in 6th gear?
  10. C

    M939 series diffs

    @simp5782 it would be much more difficult doing it in a 936 and would consider removing the boggie from the truck to do that kind of maintenance. I would like more speed, but the 936 wt. is already a killer and is a bit gutless for my likings. To make the gears taller, would, i think, make...
  11. C

    M939 series diffs

    To leave the M920 diff thread alone. Has anyone swapped out the R&P on the 5 ton axles to a more OTR ratio? I would think ring & pinions for Mack trucks could be swapped into the rockwell housings. Are my assumptions wrong?
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