Rob

RL 797 but I have access to an RL600 to look at. I think it's an RL-686 w/tip turbin engine.

Yes I do have a 12 speed already. It will probably be late spring before I'm ready to pull the truck down however as I've got a lot of projects to get out of the way. Do you have any numbers from those mounts you have? I can see some on your photo but cannot effectively make it out. I can pretty easily see the mounts in my RL out back I put photos up from.

The thrust bearings have always been rollers. The upper king pin stem could use needle, or bronze bushings.

Yes. The auxiliary handles are on opposite sides of the two transmissions. Easiest to install two separate shifter boots to cover the access holes rather than a large single boot.

Pretty sure I have a set of roller thrust bearings for an FA-505 at the shop. Both the FA-511, and FA-505 used the same king pin set if close in the same year of manufacture. The main differences were either needle bearings, ream to fit bushings, or presized bushings. Both axles are of the "Type III" design. I've never seen a king pin set not supplied with new roller thrust bearings myself.

Well it is great knowing you won't be stealing "Momma" for a jaunt as she won't ride in a truck without arm rests. Ya see, she uses the door to keep one side of her hindquarter flaps in the seat, and an armrest to hold the other. As small as an R model cab is inside, I'm certain you don't want to rub hips with her as might interrupt, or bind your shifting routine. I don't have armrests either but do carry an extra ratchet strap for the rare occurrance, but then have to listen to her..... On top of that and as added benefit, there won't be any of that "ooze" to clean up afterward. Seats, and interior work look good. Should be a reasonably comfortable truck to drive when finished.

If'n you get to needing another two stick six speed, the one in my R-795S is going to be replaced with a 12 speed Mack sometime in the future. Nothing wrong with the trans and it is the TRDL-1071 with 23:1 reduction in the lowest gear.

Happiness is a belt fed weapon.

Another set of OEM Mack rear engine mounts removed from an R model and given to me by one of my vendors after they sold the Fuller transmission from the truck. I also have the frame brackets too. These are fabricated with 1/2" material.

I had repowered that truck with a 300+ engine and installed this 16 series 13 speed replacing the original TRXL-107 which was worn in, and out. The original ENDT-675 engine was rebuilt complete, and installed into one of their sprayer trucks which was an R-685 with a hole in the block. The original TRXL-107 remained in that chassis. Not many around here really favor the old two stick transmissions any longer and I've been asked to convert this one over to a Fuller.

Mike Schaffer out of Springfield. Runs a fleet of them.

Not flimsy at all being 3/4" plate gussetted with 1/2" strip.. idea was directly copied from factory mounts in another mack with a Roadranger trans. Truck still works every day during planting and harvest running well over legal limits.

What are you wanting to know as far as differences? Width, caster/camber angles, SAI, usage? Let me know as I have all that information. The FA-511 was used in more than the early R series.

They are out there but getting scarce. I made the last set I'd needed to install a Fuller into an RL-685: They don't have to be anything special, just ensure enough strength, and your driveline angle is correct, as these directly support that.

They are 3/8-16 grade 5 so about 20-25 foot pounds would be good. While the manifolds are off I'd lay a straight edge across the sealing surfaces to ensure they are flat. If not it would be a good time to have them "planed, flycut, decked" or whatever it's called in your neck of the woods to ensure they'll seal. Standard procedure with exhaust manifolds while off for me.

The long and short of your problem is the incorrect rear engine mounts are most likely installed. I suspect when the transmission was changed by the prior owner it was a used unit pulled from an eastern R model with a splayed frame and installed into your straight frame rail truck without swapping the mounts from the original transmission. If you look at the mounts side by side it is easy to ascertain the difference and see the outward offset, (front hole) to the splayed frame mounts, where the straight frame mounts are in a parallel plane to the transmission case. Just a casual glance and most didn't see any difference but if you install as this scenario, the engine is back about 5/8" usually. There are four different sets of insulators available for the R series I remember and believe it or not using the incorrect insulators, you can get the retention bolts installed. Many did exactly this during the late 1970's into the 80's and various methods to correct for it were attempted including shimming frame mounts to offset the mounting location. Think about it for a minute: the bolts go into the holes and these bolts are equidistant from the frame rail flange edge as shown here on my R795S left frame rail: Right frame rail: The rear engine mounts on the eastern trucks are in the splay area of the frame which is why the offset. If you look at the fasteners and were to lay a rule from them to the edge of the frame rail flange, they would measure close, (within manufacturing tolerances). The same applies to an RL series shown here: Left side: Right side: As can be seen from the photos the fasteners are just about in the same parallel plane whether a straight rail or splayed rail frame. I suspect your transmission was swapped without regard to any of the mounts being slightly different. The inexperienced eye would probably not see it in a hurried atmosphere and it could have been easily thought they are the same. There is no difference in the rear engine mounts mounting pattern of the TRL-107, or TRDL-107 or any of their variants. The only real difference is the length of the transmission rear tail housing. If going from a five speed to a six speed transmission as example, the driveline needs shortened about 6.5 inches. Conversely if from a six speed to a five speed as the 685 series was offered. Bottom line I feel is you are going to need to round up the correct rear engine mounts, or manufacture your own to correct your problems. I've done them in the past as they were "hen's teeth" to find all those years ago used. Hopefully the mounts on the frame are original to the truck or another chapter opens. Not a hard hill to surmount but one that does need climbed. Rob

If the original poster would put up the starting sequence of the truck's vin number as has been asked a couple of times, I may be inclined to impart some knowledge into the matter.

Save it for me if you would as I have a mate for it. Rob

Thanks for the response Tim. Pan looks good and a nice combination of both hand, and machine work. Hope and it should serve you well.

We lost a LOT of our parking spots in commercial parking lots along the cruising "strip" in the 70's because of garbage being strewn about once people were finished with their beer, McDonalds, or even rubbers, (condoms for the younger set) in the parking lot(s).

I don't think it out of line either but it would only bring what the market would bear. No one else must have bid from my earlier posting when the dollar amount was at the sale amount? I thought it would bring another 20%-25% given the following they seem to have.

Damn! Only beat me by $11,249.00. I was robbed!!!!! Actually it would be nice to know the future plans for the truck as there aren't too many left out there.

I don't have a photo Trent but the pads that mount on the underside of the hood are different for the rollers to bear against with air ride.

Never heard of them but I certainly would be interested in seeing the finished product.

Postal regulations mandate the boxes be on a breakaway mounting. That same scenario has played out here also with a steel pipe cemented into the ground as a mount anchor and it didn't prevail in the suit that was filed. That one however involved injuries to the vehicle occupants. That being said, I know a guy out west of town where his mailbox is mounted on a 4X4 timber and not 18" from the mailbox is his newspaper box securely mounted to a locomotive crankshaft that is bolted to a cement slab.