how to determine 3.55 or 3.92

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

jon0m0berry

Senior Member
Joined
Mar 4, 2015
Posts
133
Reaction score
22
Ram Year
2010
Engine
hemi 5.7
trying to see what i can tow. how can I tell what rear end i have on my truck? i read to look at a sticker on the passengers side rear axle, but when i looked it was taken/fell off. you can see were it was though. only thing i can really think of is what your engine turns at, at like 60mph. i would assume there would be a few hundred difference between the 3.55 and 3.92 at that speed. mine is a 5.7 5speed with stock size 275/60r20 tires. any info helps
 

stimpy433

Senior Member
Joined
Mar 10, 2016
Posts
3,583
Reaction score
3,165
Location
IOWA
Ram Year
2014
Engine
3.6
There should be a tag on the rear differential that's stamped with axle ratio.
 

DILLIGAF

Senior Member
Military
Joined
May 28, 2016
Posts
4,274
Reaction score
7,729
Location
Canada
Ram Year
2012
Engine
5.7
Its also on the build sheet
 
Top