Re: trans/diff problem

Posted by Joe on Oct. 20, 1998 at 07:01:10

In Reply to: trans/diff problem
posted by Rick on Oct. 20, 1998 at 00:17:51

: I recently purchased a 1928 Model A Stakebed, 18 spd. The previous owner said the splitter in front of the differential was out. We rolled it in neutral onto a trailer but when unloading, we couldn't get it to move-seemed something was catching in the rearend. When we started it, it fell into gear and we drove it off the trailer. Anea ideas?????????

Rick -

I would like to give your question a shot but before I start I have some questions

What is the "splitter"? Do you mean an accessory power take off, or possibly the "dual high" unit.

With 18 speeds it is likely that your truck has been heavily modified. Originally the Model AA truck was offered with a three speed transmission (same as the car) and a "dual high" unit which effectively doubled the speeds resulting in a 6 speed truck. The dual high was a planetary gear setup and was in reality a "dual low" in that it offered speed reduction for carrying the service load of the truck. This would have been the standard setup for your 1928 truck.

Later (about October 1929) Ford beefed up the entire Model A truck line and made it a true 1-1/2 ton capacity. (Actually 2-1/2 tons with dual rear wheels) In the process the suspension was upgraded and Ford starting supplying the truck with a special designed (Borg Warner) 4 speed transmission. From this time forward the "dual high" was considered an option - some trucks have 'em, some don't. Thus we have as a standard Ford truck the possibility of up to 8 forward speeds.

I could see if your truck has been modified it might have had incorporated a "free wheeling" accessory. These were fashionable at the time of the Model A in the interests of fuel economy. This might give you the problems you're encountering.

The other possibility I just thought of is that the 3 speed trucks with dual high were mostly supplied with a worm gear differential. It may be that your worm (through wear or just general cussedness) may turn in one direction easily but lock up in the other.

Don't know - you'll have to fill us in further.

Do be sure to let us know though. Your truck sounds like a dandy, and frankly, I'm envious.

Best regards,
Joe

p.s. Is the rear window located high up against the pressed in square of the upper rear cab panel and do the words "Ford" appear in script above the window? If so it is an "early" AA truck.




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