The Stovebolt Site Forums The Parking Lot Big Bolts What rear is under my truck? (60 C60 ramptruck)

Trying to figure out what rear is under my truck. Pics:

http://www.speedyoldtruck.com/images/ramp4.jpg
http://www.speedyoldtruck.com/images/ramp12.jpg

Dash lists gear ratios on dual speed rear at something ridiculous like 6.17 and 8.40, I've got a lead on a 6.5 NA Diesel from a late 90's cube van that I'd like to put in the truck, curious what my options are for gears that aren't quite so deep. Considering a Spicer 5053A 5-speed overdrive behind the diesel, so I'd have some OD, but would like to have enough to be able to cruise at ~75 without having the motor absolutely screaming.

I am no expert, but I would think that you are going to need a lot more than just pictures to go on. The photos of the housing may be able to determine a manufacturer, but you will probably need to search for casting and serial numbers, to get you the most precise information. Knowing how many lug bolts and there spacing (bolt circle) may also be helpful. On my older big bolts, there are both casting and serial numbers on the pumpkin (center section). That would be a good place to start looking. Good Luck

Kris,

With the vacuum shift it looks like a 15,000# Chevrolet rear which will have 6.40/8.72 gear ratios. I don't think there are any options for swapping gears in this rear.

The 16,000# optional Eaton rear would have an electric shift motor and might have a better gear selection.

The gear ratios will be stamped on the front of the rear center pumpkin, it might require some scraping (passenger side of the face) and a wire brush to read the numbers.

Eaton only stamps the High ratio number on their 2-speed rears [i.e. 6.40], the low ratio is found by multiplying that number by 1.36 [which will get you real close].

Mike B