Lmackattack

yea I only drove the 100% air shift versions. drove one behind a 350 and one behind a 300. I like that you can drive it like a 5 speed. or split if you need. . with the 300 I would start in direct/1,2,3,4,5 then split to hi and go home in OD. I know the grind that you talk about. hard to get use to and know it hard not to..... Im thinking about bidding on it for my RS700L. off the top of your head...What top speed will I have with 4.17s? and LP24.5s. Im stuck at 62MPH/2100RPM right now. Speed limit in IL just went to 65MPH.

tires are unsprung weight. think of them like a basket ball. problem is we have 8 of them out back all bouncing. try this to see if it helps. First reduce the air press in all 8 down to about 20 psi then go bobtail around. if the bounce went away. it could be a tire balance issue. have them all ballanced. Most people dont balance drive tires but it can make a diffrence. I know it does on a car so it has to on a truck. other issue is that the springs really dont move much and they pivot at one point on the suspention. If you dont have shocks to help control tire bounce you will feel it. If the vibration is bad with a load on the truck it can be bad motor mounts, or drive train issues. I have even heard a bad power divider can cause bad vibrations ?

He is just pulling your chain, aka.... making a joke.

thanks for this info I may bid on this if the price is right... can you simply add a air shift for the aux box? and remove the stick? does it take the mack pto that runs off the lower counter shaft? also is this one of the only mack 2 stick transmissions that has the main stick on the out side?

thats what I was thinking... anything to look out for with the older model 12 speeds?

how do you shift the 2 stick 12 speed? Do you just use the main and split like the single stick 12? then use the aux for low and reverse?

saw a listing for a 12 speed , pics show it has 2 sticks and a air shift cover at the rear. all the 12 speeds I drove had a single stick with air splitter for Direct,Hi,Reverse on the stick and low low on the dash switch. ever seen this before

thanks for the link dan... the point was when he said "go left on Dundee Rd" I did not have to ask 3 times "WHAT WAY!" I dont talk on the phone when driving but do have a nextel..... beep,beep

Brad.. I spent all summer working on the RS cab. I painted the unseen interior parts with a rubber undercoat paint. then put dynamat throughout the whole cab. The cab floor I added dynamat, sound matt, and carpet on top of that. Under the removable floor I put a 2" foam,foil,insulation square. this square is used in gen boxes to keep the engine sounds inside. Fire wall has dynamat,soundmat, and removable Carpet sections that have insulation added. Rear wall has dynamat with 2" insulation between the interior rear wall and steel cab wall. I stuffed 5" of insulation in the cab corners. Roof was the hardest part as there is little room to stuff insulation. The under hood firewall will get some removable 1" foam. I can see it had this from the factory but was long gone before I bought the truck. I also will be adding 1" foam on the under sound of the hood and hood sides. I tested the hood foam and it made a huge diffrence when the hood was closed. Right now the biggest issue is the steering shaft hole in the fire wall and gear levers. those are the w 2 holes that let in the most sound. with the cab doors closed, windows up, engine fan off, its pretty quiet. If it was a newer electronic engine under the hood it would be just as quiet as a new pete or KW. I was on the phone with a friend and he did not know I was in a truck.... Trent

I must be lucky because most of the time at my Mack Dealer..... Northern Il Mack.... I can call and order R model parts and they likely will know the part number and can tell me if its in stock with out having to call me back.... Dan... what law just passed (dident pass) with the railroads?

thats great to hear. hope it keeps moving forward........ off topic ..Mack3P.... last year I recall you had to move if you wanted to keep the job? is that still an issue or are you secure for now?

when ever this happend I had a the air/water separater was clogged or the filter was old. Mine did this every 40 sec and after I replaced it (5 years ago) it acts normal. I really only notice it only kicking off after the gov kicks out.

RW they could have had ,285,300,315 HP 6 cyl macks as well as the line of V8 macks, off breed engines detroit, cat, and cummins I6 and V8-V12 models. Just about all transmissions offered mack and offbreed. common was mack 6cyl with mack transmissions but their were alot of offbreed drivetrain found in them due to the larger hoods.

thats is good news..

I have seen this on a few diffrent trucks. At work we have a 1996 IH that has a crossmember that was cut out with a torch so that the U joints dont rub... this was a factory fix!!!... Only thing I could think of besides replacing the crossmember is to add "stops" on the axel tube/frame so that it cant move that far up. some R models with camelbacks had these "stops". My RS700L has them

R models had some diffrent interior trim levels. in the late 60s-the 1972 years it was green steel and tan... pretty common and basic. With the intro of the R+3 cabs came more options but most common was the tan. Western R Macks I think had the most availible. I have seen Western R macks with Black,Gray,Brown,Red,Tan,and Blue. some of the interiors were very nice with embossed dogs in the seats and door panels. and diamond pleated cab walls. In the late 80s thru the 90s it was pretty plane again with charcoal being the most common. I dont know all the options but yes there was more than tan and gray

thats pretty cool dan... did you play the lotto today?

sounds like the same issue my company IH has with a stainless visor. you have to find the vibration and adjust that aera to get it to stop. I took a nerf ball and stuffed it in a few places and went for a 75mph drive on a windy day to fing the issue... hope this helps Trent

I was in canada about 10 years ago I saw one of these as a cement truck. also saw a R or RB? with twin steer as a concrete truck. Was up there 2 weeks ago and saw very few macks compaired to the last time I was up there....

If this is the raised part of the rear cab floor, where the Passenger seat rear legs bolts to, it should be straight and flat from side wall to side wall. is it bent upwards where the 2 large bolts are in the rear cab floor? those bolts are for the rear cab mount. If it is a non air ride cab it is possible that bad roads caused the cab to dent upwards. I have seen a few R models that had this issue. they were always on/off road construction tractors and had rubber pad rear cab mounts. One was so bad that it had to be welded. its not a common issue but have seen it a few times.Look under the cab and see if there is rust or if the cab mounts are pushed up into the cab floor.

Update. I removed a door panel from the passenger side of a mid 90s R model and put my 1977 panel in the door. the good news is that a new door will accept a panel that has the old style (round)latch without any modifacation. It also looks stock and no large gaps in the latch aera.I was able to bolt in my old panel and all the bolt holes lined up. Only thing I could not test was the latching of the door. Painted it tonight and will bolt it on tomorrow if I have time after work. Trent

I have doors with the round cut outs for the latch. I need a new drivers door but all I can find is the doors with the "D" shaped hole for the newer style latch. The mounting holes all look to be located in the same place just the cut out for the latch looks diffren? Can you bolt a newer door on a older cab modify the hole and will it operate correctly?

at the Iowa 80 truck show a few months back I saw a new pete with air ride front axel. I was suprised to see it had 1 and 1/2 leafs...a single leaf ran from forward and rear shackles and the 1/2 leaf started from the front and ended just behind the axel. this is where 2 small air bags were bolted to the axel/frame. driver could control air press from the cab. said it rode like a old classic car does. no shock at all. I wonder if thats a on road only set up? If it could be used off road I would like to find a set up like that. not just for the comfort but it puts less abuse on the truck. let us know how your set up is when your done

im not that old but I remember the parts books. what I really liked was pumping my gas/diesel and then going in after I was done filling up. now its..... going in to pay, going back out to pump....going in to get your recipt and snacks...back out to you car..... and they dident have cameras back them to catch people driving off because it rarely happend...

1972 R685 with a 1979 285HP tip turbine Specs 2 stick 6 speed (direct) 4.17 rears new flat black paint and rustoleum red has lost only twice to Mr Stark. was taken off the road in 2005 started pulling in 2008-09