Hello all, I am trying to determine the axle ratio on a 1994 LTS9000 that has a door post axle code of 6A. On my older L9000's (1970's and 80's vintage) I have the Ford Shop Manuals that under identification codes decode the 23,000 lb single and tandem axle codes relative to the door post axle code. In the older books the 6A code is not listed under the tandem codes but only listed under 23,000 lb single as a Rockwell with 4.88 ratio. I'm pretty sure the 1994 LTS9000 does not have 4.88 ratio. Does anyone know if there is a tandem axle code chart for 1994 heavy trucks available on the internet or if the 1994 heavy truck shop manual would still have this chart and that would be the best source. Thanks, Dan

 

I have a 95 Service manual and there is no chart with the info you're looking for. If you have the last 7 of your VIN and call a parts dealer, they will be able to tell you what ratio it left the factory with. If all else fails. on the input shaft where the nut holds the yoke in place, there should be some numbers that tell the teeth on the pinion and ring gear. You divide the large number by the small number and you will get the ratio that way. I have a 90 LT9000 with a 4.88 ratio.

FWD

 

I did some more searching, and: IT's a RT-40-145P which is a 40,000lb tandem with a pressure pump and 4.33 ratio.

FWD

 

The rear axle codes are in the parts catalog, but the 17 digit VIN has no rear axle info. It's simple: The AXLE code is printed on the Certification Label, post what it is.

There's dozens of rear axle codes, so I wouldn't attempt to list them all.

 

Thank you FWD and ND for the replies. As the original post says the axle code on the door post certification sticker is 6A. Truck build date 4-94. I will attach two pics of the 1976 shop manual I have that shows the axle codes for 1976 trucks. Most of my other trucks are 1971 to 1983 and the shop manuals for those years had the decoding information in the "Identification Codes" section. Thanks again for the help decoding the 6A code for 1994.

 

 

Ford's Body Builders Layout Book for the late 1990's Louisville and Aeromax cab chassis trucks confirms that the axle code 6A was used to identify the Rockwell RT-40-145 tandem axle with a 4.33 axle ratio.

So now you have two corroborating sources.

Sadly, Ford recently took down all the Body Builders Layout Books for vehicles older than 10 years when Ford revamped the BBAS website. I happened to have a printed copy in my office, which is what I consulted on your behalf.

 

Thanks Y2KW57 for looking up that 6A code. If I buy this 1994 truck it will be the newest Louisville in our farm fleet. I just love the body style of the Louisvilles. It is getting harder to find parts for what used to be "commonly stocked dealer parts" like fuel tank straps for the "D" tanks and headlight hardware that seems to get rusted and rattled apart but I keep buying parts trucks when they appear to try and keep our trucks going. Thanks again, Dan

 

In your quest for parts, don't forget Sterling.

When Ford sold all of their production and engineering assets in the Lousiville/Aeromax lines in the late 90's to Freightliner, an old and long forgotten brand name in American truck manufacturing, Sterling, was resurrected and reshaped to fit in within the Ford Oval, so that hood and grill stampings and moldings could carry on as designed, but rebadged. That spin off has since shuttered, but parts are parts, and as long as they fit or interchange, you have yet another resource to keep your old fleet farming.