Vladislav

21 hours ago, cruiseliner64 said:

Thanks for your nice comment Vlad.The white paint is  DuPont Imron white code 28072U...no pearl.Interestingly the guys in the paint shop told me it was used by Fiat in Europe.

Paul

Uggh!

Italians have stolen a Mack color! What a shhhame!

17 hours ago, FarnorthMN said:

@Vladislav @BottleHauler84 just talked with a guy on the phone today and he clams this is the cross member thats suppose to be on on the rear.  I find it interesting becuse I have the same crossmember for the cab air ride suspension about the middle of the frame.  I mesured everything on mine today and if I can read a tapmesure should bolt right up and also work with the rear shocks. I still like one @BottleHauler84 has given me better 

 

 

Yes, this crossmember is supposed to be on the rear. I have a similar one on the rear of my MH. With spicers at the sides and put with the dish up. Very probably you have a similar part as the cab support but I expect that to be a single beam. If that one is double like the one in the pics I'd like to see your cab air ride setup.

Good luck on the fix and future plans!

Sure it does qualify!

Happy Birthday Linda!

14 hours ago, BottleHauler84 said:

@Vladislav from what I've encountered,  the QL4551M is whats on RW Superhauler 2 and MH Ultraliner 1/4"( or 6mm) thick rail frames. On the the double frame RW or MH, I've seen 9QL4551M2 used. Also, I've seen 9QL4551M2 used on single frame RW2 and MH with 1/4" thick spacer plates in between the crossmember and rails. 

The ones used on the R models were i believe 9QL4551M8. The were a bit more narrow to accommodate the narrow frame rails of those trucks. 

This sounds right since R-model frame is a bit narrower than RW2/MH. I have the crossmembers off the R apart sandblasted and painted. So can check out the stampings if needed. Interesting point of using shorter crossmember with spicer plates on the single framed RW/MH. One of my MH's (I have them two) has the very rear beam arranged that way, with spicers at the ends. It's a single frame 1/4" chassis. But it's two stamped shells of the style the original discussion was about, welded together.

Also remarkable point is the 2nd MH has the crossbembers off a R/DM. It's Camelback with single 1/4" rails. Sure those parts are wrong for the truck and the rear engine mounts are put on the chassis brackets using spicers to elevate them a bit (for an inch or so). Originally I was surprized seeing the engine lifted up that way but the owner couldn't say anything on that. And later I found the rear of the chassis became narrower than it should so the engine mounts couldn't fit right and somebody in the past arranged the spicers to clear up the edges of the frame rails they would interfere otherwise.

Thank you for the part ##.

She's getting looking sexy.

That white area - is that plain white color? Or with addition of pearl?

On 11/28/2025 at 4:19 AM, FarnorthMN said:

@Vladislav I think you are 100% right I did find one that looks very similar to what I have off a 88 DM600 that looks like mine only flipped over.   Think im still going to find 9QL4551M back to back that seems to be stronger and cheaper.   otherwise just reweld and fix what I have.   

 

If you look at the #2 photo in the set of pics I posted you may find there was a back to back style using two crossmembers like yours. This way you could make a such one using your old part and that piece of DM. And that would be much stronger than just repair of your original part. But as far as I understand DM must be narrower.

Also a berry from the same field - what is 9QL4551M? Is that exactly for Superliner? And for which frame? Single? Or triple?? I ask because those in my R-model are also 9QL-something. I don't keep the digits in my mind and haven't found them in the computer. But those would definitely be different from what you need by the width. At the same time looking almost identical on a picture.

Me either, ha-ha..

It appeared to me the trunnion shaft was higher on Temperleaf than Camelback. Not almost sure, follow Terry's advice.

19 hours ago, Geoff Weeks said:

Na, it is beacuse if you are a rookie, and trying to pull the loaded trailer with parking brakes on, you need full power available! 

A five star rating joke!!! 

The truck looks having good potential. Congrats!

On 11/21/2025 at 6:37 AM, FarnorthMN said:

so are the 9QL4551M  replament for the style I have? that will work for the new way suspension mounts? Just need to drill? sorry for my stupidness 

Looks like Mack used different styles of the crossmembers which played their role equally. Some trucks had the style your truck have, some those flat style doubles. That's for 80's years and maybe earlier. Don't know the reason. Options? Or just supplys from different vendors? My R's are Canadian built (actually assembled) and they look slightly different in a few points than typical US production vehicles. Of what I noted (if I'm not wrong) a certan chassis has all the crossmembers of the same style (what makes sence). But practically it doesn't look any wrong if you put one crossmember of different style and it fits right and functions well.

15 hours ago, BottleHauler84 said:

@FarnorthMN I was looking at my 1988 MH613 with Neway air ride. It has this style rear cross member on it which is also a very popular crossmember Mack used for rear,  mid and at the cab. The part number is 9QL4551M. Mine has 2 of those back to back. They are 1/2" thick steel. 

You can find these used pretty easy. PG Adams also make these exact crossmembers and the quote i got from them was $257.05 a piece. 

 

Here's a couple internet pics of the 9QL4551M crossmember 

Worth to point out these do exist of different width. I have two R-models (which are originally differerent to a RW/MH) with those and the truck with double frame has them shorter than the single rail unit.

BTW my R-model with Neway has particulary this style for the rearmost crossmember. With shock brackets attached to it. 

Looks like ARD-125 to me (the setup in my 1988 R-model)

When I was taking my old iron apart a tag was found riveted to the RH (or LH?) airbag support plate down side (seen from the ground).

17 hours ago, FarnorthMN said:

I am struggling big time finding part numbers 

Check out PAI FKT-4736 and FKT-4737.

I've got a trouble with one rod though when PAI bushing was found loosy in the hole. Another rod pressed in Ok. So seems like there could be different vendors of rods with differences in internal specs.

A couple add ons.

There's a variation of that cross member as a double style when two similar webs are welded together for more rigidness (the 2nd pic). You can use it too paying attention to the shock brackets (using spicers again or so).

And if you find a trouble locating a used part you may contact PG Adams in Vermont. Those folks specialize in fabrication of frame rails for trucks and also offer variety of crossmembers of different styles.

What you have at the rear is a common style Mack chassis crossmember. They were used on many trucks with Camelbacks and other rears in the central portion of the chassis. Just were put upside down overthere. More correctly, the very rear crossmember on your truck put upside down to clear up the trailer pin for coupling (and that's a common practice). Those "common" crossmembers may have holes for the shock brackets. If no you just drill them. There's one point though you need to keep in mind. Frame width is different between RW and earlier Mack model such as R, U, DM, F etc (which used to use those members) Those are narrower so you need a parts from a RW2 (after 1985) or MH Ultraliner (similar chassis). Or you can use a R-model part adding spicer plates.

P.S. CH and later models have different distance between the rails too.

Drool, drool, drool!  

Outer bearings are 45280/45220 (set 413 as mentioned above)

Inners are HM212049/HM212011 (set 409)

Stemco seal either 383-0139 or 383-0239.

There's a wear ring of 4" OD the seal works against of but you don't need refreshing it if use unified Stemco seals.

My guess is the outside plate is aftermarket (repair-reinforcement). I saw many Superliner chassis and also R-models with Neway and have never seen any arranged that way. The inner plate (spicer) is the most probably factory. To compensate possible use of the inner rail. My 1988 R-model Neway arranged particulary. Single frame rail with two holes for the rod bracket attachment and 1/4" plate at the inside. ...With hard cracking near the bolt holes. So I'm looking for options for a "nice" fix. Probably will also fabricate an outer plate but less in size to look smoother. And I don't plan to carry loads by the truck.

Welcome to the group!

The truck looks very nice!

I'm pretty sure a little bit of touch up and she'll be a bomb!

Vlad