41 Ford F15a CMP

[Kootenay Cruiser]

And what is the gear ratio of these old Ford axles?

[Tony Wheeler]

Originally Posted by Kootenay Cruiser

And what is the gear ratio of these old Ford axles?

Just to expand a bit on other replies - F15A came with 16" wheels and 6/39 toothed diff (6.5:1 ratio), while the 3 tonner Fords (F60S and F60L) came with 20" wheels and 6/43 toothed diff (7.16:1 ratio). Ditto for Chev series - as Bob says the axles were designed to be interchangeable.

Looking forward to more pics as this project progresses, and hopefully some YouTube video when it's finished, putting it through its paces off-road. Should make for spectacular viewing with 350 Chevvy and monster tyres!

BTW your rear crossmember damage is typical Rob, and I notice you're missing the fishplates as well. These are essential for frame strength and stability, so you'll need to find a pair or fabricate some, along with a new rear crossmember. Others have faced the same task, you'll find a discussion of the subject on this thread, starting about halfway down the page:

http://www.mapleleafup.net/forums/sh...=15575&page=17

Anyway good luck with the build, it must be very liberating to throw away the book!

[Bob Carriere]

Just to expand a bit on other replies - F15A came with 16" wheels and 6/39 toothed diff (6.5:1 ratio), while the 3 tonner Fords (F60S and F60L) came with 20" wheels and 6/43 toothed diff (7.16:1 ratio). Ditto for Chev series - as Bob says the axles were designed to be interchangeable.

The MB C2 shows a ratio of 6.5 and the GM Major Assembly manual shows ratio as 6:39......... and 6:39 is what is usually stamped on the outside of the gear cluster and I remember now that this was previously discussed on the MLU at the "Tooth" count on the ring gear.

Bob

[Tony Wheeler]

Originally Posted by Bob Carriere

and 6:39 is what is usually stamped on the outside of the gear cluster

You've just reminded me Bob - the diff ratio on Fords is stamped on the outside of the housing, adjacent to the filler plug, so it should be a simple matter for Rob to confirm. Here's a few examples on my own Fords, and a stores tag I found wired to a Ford diff housing recently. Presumably a replacement axle assembly - rather important to choose the correct ratio!

[Bob Carriere]

Here is the stamping from a Chev 15CWT.

Bob

[Kootenay Cruiser]

Thanks for the info guys, I'm going to replace the rear crossmember with a piece of 4" square tube and then mount a 10000 lbs winch in front of that with the fair lead bolted to the top of the tube