Ring and pinion availability

Hi Everyone

If anybody can find a set of gears maybe in the 3:56 range (2:10's would be even better) for these old vehicles that would be a awesome thing. I would love to be able to actually drive one of these things on a paved surface like real road type thing. I dont off road at all but would love to be able to drive one of these trucks to work on a daily basis.

Oh yeah how do you guys break rearends on these vehicles anyways???

MikeC

 

What tire size and engine are you running? That will determine an appropriate gear ratio. 3.54's are common in Dana 44's.

Oh, and post separated due to thread hijack. From the Forum Rules and Guidelines at the top of the page:

19. If you have to apologize (or say 'I don't mean to hijack') for posting something DON'T (post it)! Does not apply in OT.

 

I just scrap yarded (2) sets of fsj D44 3:54s with carriers. Common as grass from D44s, cheap. So you only need to buy new for the front axle.

 

Hi Texas

Thanks for the reply but I gotta couple of stupid questions not sure what "fsj" is (what is it?). the D44 is a Dana model 44 rear end right? That 3:54 gear ratio should allow me a better gearing for actual driving on a real asphalt type road right?? Better MPG's also and less RPM's on the motor right??
Also what year and model were these pieces that you scrapped out so I can begin my search locally.

Thanks again for all the help.

MikeC

 

FSJ means Full Sized Jeep like wagons, trucks ect.

 

Which engine do you have? Using 3.54 gears with the F134 is guaranteed to be disappointing.

A '74-79 full-size Cherokee or J-10 pickup will have D44s front and rear, and is likely to have 3.54 gears. Most Wagoneers will have lower (numerically) ratios, like 3.31, though some will have 3.54s.

 

Scouts also used 3.54's with Dana 44's very commonly, as did GM, Ford, etc.
I go back to my previous question. What tire size and engine are you running? These would dictate what gear ratio you should run.

 

Hey Nickmil
Back to the questions at hand...I will run what ever tire I need to run to make this pile run down the street. What size do I need to run??? I dont care about off road stuff or climbing stuff...I drive on paved roads only. My CJ2A has the stock flat head motor in it so that would it is flathead...not sure of the cubic inches tho..stock motor is a 134 I believe. I have a set of stock 16" steel wheels which I would love to be able to use. I dont have the budgets most of you guys have so if I could use these wheels that would be a wonderful thing. I have less than $500.00 into this project so far...(it is still in the rebuild stage).

Oh yeah somebody said that a F134 and 3.54 were not a good combination...why is that???

You guys have been great so far...

Thanks again for all the insight.

MikeC

 

Simply not enough power to get going with the higher gears. 0-50 would be about a mile and a half with 3.54s and a 134 motor. Randys ring and pinion has a good tutorial that will answer a lot of questions.

 

What Daryl said. Not enough power from the flathead or F head to run a tall gear ratio, even with small tires. That's why 4 cylinder early Jeeps came with low gears.
Plus if stock you're not likely to find a tall gear ratio for the 25 front axle. Even if you are able to by the time you spend the money to swap gears, diff cases, probably replace bearings, seals, need shims, etc. you're going to be in them the cost of a good used or rebuilt overdrive from Herm. If I wanted to maximize fuel economy I'd go with a 215-235 range tire and install an overdrive. I realize you are on a tight budget but you can't change the basic design characteristics of the Jeep and still use stock components.

 

www.hermtheoverdriveguy.com

 

Yep - not enough power to overcome wind resistance at lower RPMs. Your top speed will decrease by going to a much taller ratio, and it will take longer to get there.

 

If you've got a stock CJ-2A then you have a Dana 25 Front and Dana 41 rear (unless it's really early then you have the D-23 rear full floater). I don't think higher ratios are even available for those axles. A Warn/Saturn overdrive is the best, easiest and probably cheapest way to higher gears.

 

O/D 5.38s
2nd overdrive was my favorite gear pulling hills when I lived in New York, the letchworth state park / finger lakes area to be specific
level crusing or downhill was 3rd O/D when mine had the F-head, it is a touch slower top speed in 3rd O/D if the engine is tired so I would expect poor results with a regear in the hills, the costs of an O/D are less than 2 regeared axles with labor, the down time is shorter, you can install an O/D yourself, you have a wider span of gears, and you have wonderful half gears like 2nd O/D when you can't quite upshift but don't want to rev the snot out of the motor your entire way up the hill.