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Hi all!

Wondering what other models of Borg Warner R11 (or even R10) units would fit right into place without modifications on a 1953 Packard Clipper with 3 on the tree in place of a R11-1D (there is also a W1 stamped into casting)?

(For example,.R10F-1C or T85 R11 etc)

Thanks!
-David

I don't believe there is anything from another mfg that will just bolt right in. The OD is not standalone and being somewhat integrated with the transmission case, both need to be changed as a unit. Packard made their own transmissions and castings thru 54 and I don't believe anyone else used them. No idea how well other mfgs units would bolt to the bellhousing either but I do remember the Packard trans was used in some street or hot rods back in the day because it was beefy. Perhaps there is some kind of adapter that could be found or made to swap in reverse. If something is found, I doubt the mounts, linkage, or speedo cable would connect up without work.

As to the R10, even though they share the same service manual there are apparently some mechanical differences. Whether it is in operation or just in specifications as to torque and HP capabilities I do not know. Since I believe it was used on some smaller GM products it might be the unit is too light duty to hold up with the heaver Packard cars with higher HP engines. That was the case with the older R9 ODs when they had two units -- one for the smaller engines and a heavy duty version specifically for use with the 356 engine. This R10 question came up a few years ago and one of our Australian members specifically said the R10 would not work but I don't remember what he mentioned for a reason. You might be able to find that earlier discussion with a search of the forum.

Th R11 used in the Henney-Packards were different yet but that difference was primarily in the use of specially hardened gears to handle the 3+ ton weight that some had.