Kevingweq 122 Posted June 28, 2016 Could we get a picture of your rear axle ? Share this post Link to post Share on other sites
Kevingweq 122 Posted June 29, 2016 My best guess is an eaton "M" series tandem drive axle setup, They made 4 or 5 different models (sizes) , The lever is a manual interaxle diff lock . If it was a 3 speed setup , Both axles would be 2 speed planetary as explained perfectly by farmall57 in an earlier post MX599 's original question of wanting more speed ,probably no easy solution , but a lot of possibilities One possible option would be sourcing a 5+3 setup mentioned earlier , Or a swap with a modern diesel and fuller trans . Share this post Link to post Share on other sites
horses2 0 Posted June 30, 2016 17 hours ago, Kevingweq said: My best guess is an eaton "M" series tandem drive axle setup, They made 4 or 5 different models (sizes) , The lever is a manual interaxle diff lock . If it was a 3 speed setup , Both axles would be 2 speed planetary as explained perfectly by farmall57 in an earlier post MX599 's original question of wanting more speed ,probably no easy solution , but a lot of possibilities One possible option would be sourcing a 5+3 setup mentioned earlier , Or a swap with a modern diesel and fuller trans . Fantastic!! I really appreciate everyones input. Great info!! I apologize if I sort of hijacked the thread. Now the final question to Kevingweq is how and where can I get a copy/reprint/etc of the reference manual you show? I will need some more info on the interaxle differential lockout linkage, as my truck appears to have none of it. Share this post Link to post Share on other sites
Kevingweq 122 Posted June 30, 2016 Motors Truck and Diesel repair manual , 26th edition , I would imagine IH service manuals would have as much if not more info on them ? Just to keep the info here in line with the title, Here is the "3 speed" section of the manual Share this post Link to post Share on other sites
Kevingweq 122 Posted June 30, 2016 I believe the inter axle shift is just a rod and lever/bellcrank arrangement , Personally I would set it up with a "morse " style push pull cable. A cable would avoid the problem of axle movement on rod style linkage , Or get fancy and go with a vacuum can servo Maybe a dump body style control ? Share this post Link to post Share on other sites
dieselrick 2 Posted July 3, 2016 That is most assuredly the old M series Eaton axles - not a kit or anything of the like. There were not two speed axles in that style. The only three speed axles were two speed tandems that were wired or plumbed to operate one in high range and one in low for an intermediate. They did have a reputation for being hard on the power divider - but my dad had several back in the Emeryville era and worked well with minimal problems. Those M series tandems almost always had an aux. 3 or 4 spd ahead of them Share this post Link to post Share on other sites
R190 123 Posted July 5, 2016 dieselrick nice to hear from you again Share this post Link to post Share on other sites
horses2 0 Posted July 7, 2016 the truck does indeed have an auxiliary transmission. any advice on where an id label might be found? right now I am going thru and changing all the fluids in the rear axles, transmissions, engine, etc. Then I have to go after a rear wheel cylinder, and that's going to create a huge "while I'm here" list of repair, repaint, refurbish items. Thanks, Share this post Link to post Share on other sites
