Gear teeth....the rest of the story
 

Guys, on your trans rebuild check list remember to inspect more than just the condition of gear teeth. The roller / needle bearing bores in the cluster
and main drive gear....very critical obviously....NOS measures 1.1255....
1.126 I think anything over 1.129 is problematic. The pilot bearing dia
on the main drive gear....I like .686 / .683. Often over looked ,I have
discovered, is the thin wall bushing in second gear on the '39 up trans. After
rebushing 2nd I fit it to its mainshaft with a light drag then run it in at
2100 rpm in my lathe. It ends up with an almost free spin but no rock at all.
Charlie ny

Re: Gear teeth....the rest of the story
 

Hi Charlie, did you install the '49 Merc O/D transmission in the F-1? If so, I'd sure like to know what modifications you had to make to the frame, etc. Vic

Re: Gear teeth....the rest of the story
 

Vic,
This swap is a work in progress. The truck is at my customers shop waiting
for winter doldrums (when his business falls off to zilch). I will forward info and
photos to you as promised. The removable floor pan will help accessing things for
sure. I purchased the firewall relay, cable and a few other no longer available
goodies from Mac Van Pelt FYI.
Charlie ny

Re: Gear teeth....the rest of the story
 

Thanks Charlie, I also got the firewall mounted relay from Mac, I already had all the cables, etc. I'm looking forward to seeing your progress. Have a Merry Christmas. Vic

Re: Gear teeth....the rest of the story
 

Hi Vic
I installed a 49 Merc O/D in the tonner. It was a simple drop in swap. I fabricated a bolt in extension to the OEM X member that supported the OEM 4 speed trans. The extension supports the Merc transmission mount that's part of the tailshaft. The attached photos give you some idea of what's involved. As I recall all the trucks after WW2 used the ladder bar type frame like the tonner. The other thing you may have to do is shorten the driveshaft.
Les Williams

Re: Gear teeth....the rest of the story
 

Charley, thanks for the dimensional information on the bore and counter bore diameters. Good to write on the wall at the transmission bench.

JWL

Re: Gear teeth....the rest of the story
 

Les, thanks, I appreciate the information. Vic

Re: Gear teeth....the rest of the story
 

I've been looking for a Ford type, tin top, O/D transmission so I could see if I could convert it to a top loader and then put it in my 45 1/2 ton. I would be interested hearing about the conversion to top loading, especially what tower and forks are needed.