To say i'm clueless when it comes to gear ratios and such is a gross understatement. Eventually i will need to do something about how low my stock rear end is geared. granny low is about useless, and the truck (215/6) sounds way wound out anywhere near 55. Are different drive gear and pinion assemblys available so i dont have to change out the entire axle assembly? the hypoid punkin looks to be a PIA to split to get it open, but i'd stil like to keep the truck as stock as possible. anyone offer any options besides just living with the low gearing?

thanks

 

In 1953 Ford switched to use of a Timken Model A150 rear axle under F-250s. It is similar to the Timken Model 51524 that was used under the '48-'52s to the extent that it has, as you say, a split case and 4.86 ratio. It, however, has a longer pinion and housing than the earlier axle. The reason I explain this is because a 4.11 ring and pinion was an option on the 51524 axle but not for the A150 axle. A modern 4.11 ring and pinion conversion is available for the 51524 axle, but it won't fit the A150 axle to my understanding. No other optional ratios were offered for the A150 axle, and we've heard of no aftermarket options. The solution of choice is to swap out the axle for a Dana 60 from a 1967 to 1972 F-250. It is said to be a bolt in swap. I'll let the others describe that in more detail. I've not done it so am only going on what I've read. Stu

 

I've been looking through some old threads regarding rear axles and ratios. My '49 F-3 has all been restored,with the exception of the differential, and the pinion bearing(s) is/are grinding and sloppy. This truck has been in my family for 45 years, and cost isn't much of a factor, as I'd like to keep this truck as original as possible, in memory of my Uncle Ed. I'm assuming I have the Timken Model 51524 , as it only has 68,000 miles, and still has it's original engine, trans, etc., right down to it's 17" widow maker wheels. Does anyone have any tips on rebuilding these axles? It appears that the axle needs to be entirely disassembled to remove the pinion and it's bearings. I didn't find any metal shavings in the gear lube. I don't mind the steep ratio, as I only drive this short distances on back roads. Thank you in advance for your suggestions.

 

I have every confidence that Chuck Mantiglia of Chuck's Trucks can get you needed parts and offer pro guidance on installation. Chuck installed his custom 4.11/1 ring and pinion sets in my axles so I am sure he could tell you whether professional equipment is needed to set lash and bearing loads, or if it's doable yourself with guidance. Below is a link to his site.

Sure wish you'd get rid of the widow makers. There are good alternatives available. Stu

Chucks Trucks LLC., Chuck's Trucks, Chucks Trucks

 

Thank you for your response, Stu. Did you ship your axle to him, then? Maybe that is my best option, to insure proper installation. Turn-around time wouldn't be much of an issue this snowy time of year, either.

The wheels on this truck are in fantastic, rust-free condition, and we fortunately have 1 tire shop, less than 40 miles from my home, that has extensive experience mounting their new tubes and tires for antique trucks and tractors. Most tire shops obviously will not mount tubes and tires on these wheels for liability reasons.

 

Yes, I took him both my front and rear axles as well as my transfer case. On mine there are differentials both front and rear. Stu

 

Here is a thread where one of our members installed Chuck's ring and pinion kit: https://www.ford-trucks.com/forums/1...onversion.html

 

Fred, thanks for the link to a great thread. My hired wrench has rebuilt axles on newer trucks, so this looks pretty straight-forward to accomplish. Now off to the Engine Forum for power upgrades to handle the lower ratio. Then the widow makers will HAVE to go!

 

Swapped in a D60 from a 69 F250 in less than 2 hours. Everything bolted up with no problem. Now the rpm's are much more reasonable around the 55mph mark. The ratio of the bolt in was 3.73 : 1. Best thing that I have done to make the truck more drive-able.

 

D = F2/F250.