wishthisMackwouldwork Posted September 2 Share Posted September 2 First post, thanks for having me here! I have a retired mountain plow truck RM4x4, that i turned into a clumsy daily driver for my mobile mechanic service. I really could use a manual or maybe some people know. What are the correct tire size front and rear for the 4x4s? Mine has 12R24.5 on the back 445/65R/22.5. Just to make sure it don’t blow up running gear. Does the transfer case need to be filled up to the upper drain hole? Seems like an excess amount of oil. Also What type? And finally, what’s this power terminal strip called? Both of mine have cracked to pieces, even with 35k miles on it. All I’ve found online are terminal strips that have a common power, and these are all individual. PS anyone happen to have some fenders? I wont hold my breath. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/ Share on other sites More sharing options...
Joey Mack Posted September 2 Share Posted September 2 are you asking about the terminal strips on the firewall by the steering column? I have never worked on what you have.. just curious. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-557963 Share on other sites More sharing options...
mrsmackpaul Posted September 3 Share Posted September 3 Tyre size depends on diff ratios front and back I would imagine that they are the same On Australian Army 6x6 R models the transfer case is two speed and is like open differential They are full time 6x6 and have a diff lock in the transfer case The front axle is a slightly different ratio to the bogies I would think your transfer case will be the same Terminal strips, I have never shopped for any but most are pretty stuffed as they are getting old now, maybe try Mack Try this for a manual, it shoukd be for a Australian 6x6 wrecker https://afmsafety.com.au/wp-content/uploads/2018/03/UHB-Mack-Heavy-Recovery-Vehicle-661517176.pdf That might have plenty of information on diffs, transfer case etc Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-557984 Share on other sites More sharing options...
Brocky Posted September 3 Share Posted September 3 (edited) May be no help, But search Upstate New York truck salvage yards. They might know of a township or county highway dept that would have manuals left on the shelf??? The Mack RM 4X4 was a very poplar double wing plow truck in the "Lake Effect" snow region east of Lake Ontario. Get out your Rand McNally atlas and you will see the area I am speaking of.. Edited September 3 by Brocky Quote Brocky Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-557989 Share on other sites More sharing options...
mrsmackpaul Posted September 3 Share Posted September 3 Some more useless information Australian Army ones had 12.00 x 20 tyres from new Modern tubeless equivalent is 315/65R x 22.5 Paul Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558015 Share on other sites More sharing options...
JoeH Posted September 3 Share Posted September 3 Gear ratios should be stamped into the differentials. You can reach out to the Mack Museum in Macungie to get info on what tires the truck was originally built with. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558017 Share on other sites More sharing options...
wishthisMackwouldwork Posted September 3 Author Share Posted September 3 13 hours ago, mrsmackpaul said: Tyre size depends on diff ratios front and back I would imagine that they are the same On Australian Army 6x6 R models the transfer case is two speed and is like open differential They are full time 6x6 and have a diff lock in the transfer case The front axle is a slightly different ratio to the bogies I would think your transfer case will be the same Terminal strips, I have never shopped for any but most are pretty stuffed as they are getting old now, maybe try Mack Try this for a manual, it shoukd be for a Australian 6x6 wrecker https://afmsafety.com.au/wp-content/uploads/2018/03/UHB-Mack-Heavy-Recovery-Vehicle-661517176.pdf That might have plenty of information on diffs, transfer case etc Paul Thanks Paul! Would anybody happen to have the part number for the terminal strips? I will get the gear ratios, as i suspect that will affect tire size. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558028 Share on other sites More sharing options...
wishthisMackwouldwork Posted September 3 Author Share Posted September 3 12 hours ago, Brocky said: May be no help, But search Upstate New York truck salvage yards. They might know of a township or county highway dept that would have manuals left on the shelf??? The Mack RM 4X4 was a very poplar double wing plow truck in the "Lake Effect" snow region east of Lake Ontario. Get out your Rand McNally atlas and you will see the area I am speaking of.. Aye Brocky Thank you. I will dig into this a bit, I didn’t know they were popular anywhere. Hard to find these nowadays. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558029 Share on other sites More sharing options...
wishthisMackwouldwork Posted September 3 Author Share Posted September 3 21 hours ago, Joey Mack said: are you asking about the terminal strips on the firewall by the steering column? I have never worked on what you have.. just curious. Yes, they crack very easily. I ruined one with my head leaning against it working on the starter. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558030 Share on other sites More sharing options...
Joey Mack Posted September 3 Share Posted September 3 The part number is cast into it on the back. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558031 Share on other sites More sharing options...
wishthisMackwouldwork Posted September 3 Author Share Posted September 3 8 hours ago, Joey Mack said: The part number is cast into it on the back. Thank you! Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558041 Share on other sites More sharing options...
Joey Mack Posted September 3 Share Posted September 3 I assume you found the #'s ? Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558042 Share on other sites More sharing options...
wishthisMackwouldwork Posted September 9 Author Share Posted September 9 On 9/3/2024 at 4:04 PM, Joey Mack said: I assume you found the #'s ? They are broken apart pretty bad, I’m procrastinating in taking apart the terminals as it’s still working. Might have to wait for winter weather. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558292 Share on other sites More sharing options...
Joey Mack Posted September 9 Share Posted September 9 Maybe Heinz can run a VIN that I have and get the right numbers. Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558294 Share on other sites More sharing options...
Joey Mack Posted September 9 Share Posted September 9 RW-613/002217.. Use this VIN to get the terminal strips you need.. OK Heinz,,,, your up next Quote Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558303 Share on other sites More sharing options...
Vladislav Posted September 11 Share Posted September 11 On 9/3/2024 at 4:44 PM, wishthisMackwouldwork said: Thanks Paul! Would anybody happen to have the part number for the terminal strips? I will get the gear ratios, as i suspect that will affect tire size. The terminal strips on the firewall (two parralel 14 pin stripes) are 71MR403P14 or 25496936. They are (were?) avalible from Mack and not by PAI. PAI was offering shorter terminals from 71MR403P5 (5 pins) as MJB-4384 to 71MR403P13 (13 pins) as MJB4398. But no 14 pin. 71MR403P6 with 6 pins are used on the inside of R-model hood for connecting headlight harnesses. Those could be purchased from PAI as MJB4385. 1 Quote Никогда не бывает слишком много грузовиков! leversole 11.2012 Link to comment https://www.bigmacktrucks.com/topic/74521-i-need-a-manual-for-1986-mack-rm4x4-and-what%E2%80%99s-this-electrical-terminal-strip-called/#findComment-558374 Share on other sites More sharing options...
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