RW613 Superliner rear crossmember

[FarnorthMN]

Looking for rear suspension crossmember for my 1986 superliner.  its for the rear shocks on NeWay air suspension.

let me know what you have. thanks! 

[Geoff Weeks]

Looks like your going to be needing some torque arm bushings as well!

[FarnorthMN]

25 minutes ago, Geoff Weeks said:

Looks like your going to be needing some torque arm bushings as well!

I am struggling big time finding part numbers 

[Geoff Weeks]

Atro should be able to either get bushing or possibly whole torque arms :

https://atrobushing.com/atro-torque-rod-finder

 

P.S.their older catalog, had the bushing by dimension as well, their newer catalogs I find harder to use.

I might have an old Atro cat on a hard drive, if I can find it I'll post it. 

Edited 17 hours ago by Geoff Weeks

[Vladislav]

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.

[Vladislav]

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.

[Vladislav]

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.

[Geoff Weeks]

A lot of those bushing all look the same, but there are different O/D's for different rods. IHC used some like that and they had forged rods and fab'd rods (tube) and they bushing were different. Also some of Atro's rods were of their own design and took yet another bushing, all have the same dimensions between mount holes.

I would clean up the forged rods and through the bushing in the freezer for24 hrs, then press them in. Good results doing that. The fab'd rods weren't as good so sometimes would just by Atro's pre made units.

[BottleHauler84]

22 hours ago, FarnorthMN said:

I am struggling big time finding part numbers 

Check these out. You can still find these, but ill warn you they are expensive. 

I bout some for one of my old MH cabovers and it wasn't cheap. 

I might add, buying the rod and an entire assembly is tough to find, but if you look for each end separately they seem easier to locate.

Example: 900 44 636 you can find, and 900 44 635 appears available,  but to try to find SRK-121 seems to be a challenge.  

Also, as mentioned by @Geoff Weeks , atro should be able to find you the bushings if you go with the poly style.  

Edited 6 hours ago by BottleHauler84

[FarnorthMN]

6 hours ago, Vladislav said:

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.

Thank you sir.  I will try and find just the RW cross member if I need to drill out that's not a problem. Worse case I'll clean up what I have but that will forever bother me. I'm kinda picky like like that.  Want things done right if you know what I mean 

 

[FarnorthMN]

11 minutes ago, BottleHauler84 said:

Check these out. You can still find these, but ill warn you they are expensive. 

 

I bout some for one of my old MH cabovers and it wasn't cheap. 

I'll jack the rear up next few days and see how bad they really are. Either way they gotta be done at some point.  That for this helps me out alot 

[FarnorthMN]

5 hours ago, Geoff Weeks said:

A lot of those bushing all look the same, but there are different O/D's for different rods. IHC used some like that and they had forged rods and fab'd rods (tube) and they bushing were different. Also some of Atro's rods were of their own design and took yet another bushing, all have the same dimensions between mount holes.

I would clean up the forged rods and through the bushing in the freezer for24 hrs, then press them in. Good results doing that. The fab'd rods weren't as good so sometimes would just by Atro's pre made units.

I'll get the one I need pressed out and do some measurements. From what I understand it's best just to measure and see what I got.  I want to get this buttoned up before I blast and paint. 

[Geoff Weeks]

1 minute ago, FarnorthMN said:

I'll jack the rear up next few days and see how bad they really are. Either way they gotta be done at some point.  That for this helps me out alot 

From what I can see, both fore and after are shot, the transverse are less clear. I can also see a part number in the forged rod on one of them, not clear enough to read the number, but there is one there.

[BottleHauler84]

2 minutes ago, FarnorthMN said:

I'll jack the rear up next few days and see how bad they really are. Either way they gotta be done at some point.  That for this helps me out alot 

Trust me I totally understand.  I have a MH Ultraliner im doing right now and im putting new frame rails and adding double frame all the way back.

I decided on new crossmembers because im double framing it, so my old ones were to wide. The truck didn't have a Neway, but I might have one of the crossmembers you need since you have a RW2. Ill look at my stash and see if I have one.

[FarnorthMN]

Transverse,  fore and after don't bother me. But I have read some of the others can be a real pain to get out. Fingers crossed though will be ok for awhile 

2 minutes ago, Geoff Weeks said:

From what I can see, both fore and after are shot, the transverse are less clear. I can also see a part number in the forged rod on one of them, not clear enough to read the number, but there is one there.

 

[FarnorthMN]

1 minute ago, BottleHauler84 said:

Trust me I totally understand.  I have a MH Ultraliner im doing right now and im putting new frame rails and adding double frame all the way back.

I decided on new crossmembers because im double framing it, so my old ones were to wide. The truck didn't have a Neway, but I might have one of the crossmembers you need since you have a RW2. Ill look at my stash and see if I have one.

That would be fantastic. I'll snag that from you if you got it!!!

 

[BottleHauler84]

3 minutes ago, FarnorthMN said:

That would be fantastic. I'll snag that from you if you got it!!!

 

I've bought a few crossmembers before from these guys in North Carolina,  and they do ship. https://dexheavydutyparts.com/search-results/ if you browse thru their inventory using the search bar on their website,  you can sift through there and might even find you a new old stock. They were good about getting me good measurements on the ones I bought from them.

As @Vladislav said, that rear cross member is a pretty common one that waa used on various suspension setups.  Worse case scenario is you might have to punch different holes for your shock mount brackets,  but that should be easy enough.  

Edited 6 hours ago by BottleHauler84

[FarnorthMN]

@Vladislav @BottleHauler84 you guys are rockstars. Kinda funny i called a dealer ship near me and they couldnt come up with anything. You guys knew instantly.  Ill give dex a call in the AM 

[Mark T]

Gotta be careful with the shocks on those.  If I'm not mistaken the shocks limit the travel of the suspension. If the shocks are too long it's possible to be ripping the leveling valve off or blowing bags.

[BottleHauler84]

@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 

[FarnorthMN]

51 minutes 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 

deffently better built then the style I have. where are you guys surching for used parts i tried Manders in lakeville MN. and they didn't have anything.  

[FarnorthMN]

3 hours ago, Mark T said:

Gotta be careful with the shocks on those.  If I'm not mistaken the shocks limit the travel of the suspension. If the shocks are too long it's possible to be ripping the leveling valve off or blowing bags.

I did read a form on here awhile back about that problem.  

[FarnorthMN]

5 minutes ago, FarnorthMN said:

deffently better built then the style I have. where are you guys surching for used parts i tried Manders in lakeville MN. and they didn't have anything.  

I will also call pg Adam's tomorrow see what they have to say 

 

[BottleHauler84]

1 hour ago, FarnorthMN said:

deffently better built then the style I have. where are you guys surching for used parts i tried Manders in lakeville MN. and they didn't have anything.  

Between Goodys Truck parts in toledo  and browsing LQK, Heavy Truck Parts and Ebay i usually find alot of stuff im looking for.

Being you're up in Minnesota, Vanderhags is one place to look. I know awhile back they had an early 90s MH cabover they parted out. Not sure if there's anything left but they have several yards.  Also, C&H Truck Parts in Nebraska i know for a fact has some MH Ultraliner and possibly a RW Superliner out there. 

https://candhtruck.com/

The Superliner2 and Ultraliner of the mid-late 80s share the same frames, so a MH Ultraliner crossmember will work on your RW Superliner.

[FarnorthMN]

thank you @BottleHauler84 you have been more then enough help. I will be needing alot more parts moving forward so thats very helpful just trying to get the major things done on the list first!!!