After a 120 mile trip at the weekend that left my head pounding and my fingers tingling, I realise I need taller gearing.
I know there's the Dana swap, but I'm not going to easily find one here in the UK. So that leaves Chuck's conversion that changes the rear axle ratio to 4.11.
I would like to know if anyone on here has done one, what came in the kit and how the conversion went?
Cheers.

 

I have his sets in both front and rear axles, he installed them while doing the overall rebuilds of each axle and transfer case. But I haven't gotten the truck operational yet to give an opinion on their performance. I know there are others here that have bought and installed the kits on their own. I'd also get Chuck's description, he's honest as they come. Stu

 

Pardon my ignorance, but what does this mean? Are you saying that you currently have something like 5.XX gears and it's was just running at such high RPM's it was hard to control?

 

The stock ratio found in the Timken model 51524 differential used in F-2 and F-3 models is 4.86/1. There was a 4.11/1 ratio listed in the service manual, but not listed in sales literature or in the Chassis Catalog parts books. This ratio was also listed as optional on earlier <47 one ton trucks which used the same axle. Chuck Mantiglia has figured out a way to adapt the 4.11/1 ring and pinion sets that are today reproduced for use with Franklin quick change differentials used by circle track racers. The purpose being to reduce engine RPMs and to allow higher comfortable road speeds. Stu

 

I had one of Chucks kits installed in my 49 F2 several years ago . With 32'' tires truck cruises great at 60 mph . He's a good guy to deal with . Everything needed for the conversion comes in the kit .

 

Jerry, Truckdog's info is spot on and thanks truckdog for the background info.
John, that's what I am looking for, a comfortable cruise of 55 to 60 mph.
Do you guys know if the new ring gear needs to be riveted on like the original, or is it bolted on?

 

Chuck says:

Stu, The new ring gear is threaded, and the kit comes with bolts and beveled washers to attach it to the original carrier.

 

Hi guy's have not been around lately , so gotta ask ..4.11s for our trucks ?I will be able to run down the highway without beating my truck to death ?..really?

 

There was a nos 4.11 gear set on ebay last month. Sold for $495

Might have to start looking for a set for myself now that ive got an f3 future project.

 

Sorry Ken, don't think they work for your truck. You have the later Timken B150 axles. As I recall, Chuck has said his kits don't work in those axles. You might inquire though to verify. Stu

 

Ok .. shoulda gone to chuck first..

 

I looked at Chuck's site, but it seems to either be having an issue or it doesn't function on the ipad. Does anyone know the price of the 4.11 gear conversion? I have toiled with the idea of swapping the Timken on my '52 F3, so a gear swap is GREAT news!

 

I know what I paid, but that was several years ago. I hesitate to say in case he's adjusted pricing since. A phone call would answer it, 1(203)288-2769. Stu

 

He responds to emails very promptly and courteously .

 

SeattleF3, I've just ordered it. It's $795 for the kit.
By the way, I would still like to hear from someone who has installed one of these. Apparently the pinion gear assembly can be difficult to get out. There is a tool shown in the workshop manual to pull it out and push it back in. Chuck says he suspends the whole axle by the yoke and heats the casing and hopefully it drops out.
bob