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Ford TSB 1992-94 models rear springs & body sway

November 15th, 2017, 6:06 pm

Interesting service bulletin about body sway in early models due to only having a few leaves in the rear springs.

My 92 chassis indeed only has three leaves in the rear. Thinking of replacing with the later nine leaf version.

Re: Ford TSB 1992-94 models rear springs & body sway

November 15th, 2017, 11:29 pm

That's an interesting find. Kinda makes a person wonder how many TSB's are out that that one hasn't read yet :?

Just out of curiosity I looked at a photo I'd taken that included my rear leaf springs (I know my year is well after those included in the TSB, but after reading it I was curious). Mine does have the 9-leaf springs that are cited as the remedial "action" in the TSB.

I see they say your year could have either 3-, 4-, or 5-leaf springs. Since you only have the 3-leafers it seems you'd experience a noticeable difference with the 9-ers. (Or go for broke and get the parabolic springs :twisted: )

Re: Ford TSB 1992-94 models rear springs & body sway

November 16th, 2017, 11:35 am

Durn.

If the original owner had the Bumper-to-bumper warranty, it would've been covered for free if they'd taken it in :lol:

I'm torn between adding a spring helper, getting a spring shop to add a few more leaves, replacing with the later nine-pack, or using a sway bar instead.

Meh. It doesn't really sway enough to force me to do anything, so any change would be more like icing on the cake for me :D

Re: Ford TSB 1992-94 models rear springs & body sway

November 22nd, 2017, 3:37 am

Related: SD Springs has a product chart using the spring code from your Ford door VIN label.

http://www.sdtrucksprings.com/ford-spring-code-listings

My code is N4J, so the rear springs are code J, and sure enough under the + E-Series Van link on that page, it cross references to a 3 leaf spring, with capacity of 3450 lbs per side.

image.jpeg


Btw, my axle code is E2, which is a Dana 70 HD limited slip with 7400 lb capacity and 4.10 gear ratio, which is the standard setup for an E350 cutaway (limited slip was an option).

http://www.blueovaltrucks.com/tech-arti ... r-sticker/

I believe the E450 used a wider Dana 78 (80) with 4.56 ratio.

Re: Ford TSB 1992-94 models rear springs & body sway

November 22nd, 2017, 12:22 pm

FWIW My wife and I bought a brand new Tioga Montara 24' motorhome in 1993 on an E350 Chassis. I thought it sat low in the back and the first time I drove it at night I had all kinds of people flashing their lights at me like I had high beams on. The front end also seemed to wander a bit. I took it in to a local Ford truck dealer in Seattle that specialized in commercial vehicles. They ended up replacing the leaf spring packs and it solved all issues. This was done under warranty within 6 months of new. I don't remember the specifics as it has been many years and I threw the records away during our recent move.

Re: Ford TSB 1992-94 models rear springs & body sway

November 22nd, 2017, 4:20 pm

Well that explains a lot.

When I got mine, it was terrifying to drive. They guy I bought it from said it doesn't really like to go over 65. We didn't have an area to test it any faster so I just thought he meant that it doesn't get good mileage. The first time I hit 70, it set up a resonant sway which scared me half to death. As soon as we got home, I bought a hellwig sway bar andnew shocks all around. I couldn't believe this thing existed like this for around 20 years driving the way it did.

It's a bit stiff now, but no more wobble.

Re: Ford TSB 1992-94 models rear springs & body sway

November 23rd, 2017, 2:28 pm

My cutaway has a build date of 9/93, it's registered as a 94, and the coach build date is 11/93. Door tag lists the BN46 springs, they have 9 leaves, and there's no rear sway bar. The handling seems fine (for an RV). Wish I had an LSD. I've been stuck a couple times; camping on the beach is just too tempting. Might get an air locker. Happy Thanksgiving to you all. :D
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