Ring & Pinion Questions
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Senior User
Joined: Oct 2008
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From: Toronto, On
Ring & Pinion Questions
Hey yall, ive got a question. Im looking to change the R&P, mostly because both trucks have 4.10 which is **** for MPG, in my 77' F-350 (which has a 94' 10.25 Sterling in it) and my 89' F-250 w/ a 10.25 sterling as well
First Q: Will the R&P fit between 89' and 94'? I did research and i dont think it will, just want to be certain.
Second Q: What would be better? I soon want to put the 7.3l IDI/ZF5 from the 89' F-250 in the 77' F-350 and plan to use it as my DD / Tow rig. Im thinkin 3.73. If i added a Gear Vendors O/D to the ZF5, would 3.55 be ok?
and finally, Third Q: What brand would you recommend?
Thanks for all the help guys
First Q: Will the R&P fit between 89' and 94'? I did research and i dont think it will, just want to be certain.
Second Q: What would be better? I soon want to put the 7.3l IDI/ZF5 from the 89' F-250 in the 77' F-350 and plan to use it as my DD / Tow rig. Im thinkin 3.73. If i added a Gear Vendors O/D to the ZF5, would 3.55 be ok?
and finally, Third Q: What brand would you recommend?
Thanks for all the help guys
Logistics Pro
Joined: Mar 2011
Posts: 4,197
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From: Central Wisconsin
A couple things to note: 4.10s are good gears if you're going to be towing anything, like you said you want to with your '77; 4.10s are also good gears if you aren't on the highway a lot or just have larger tires, as they help you get moving.
1) Yes the gears will change between the two, but if you were going to swap them, I'd swap the whole axle to save trouble.
2) Refer to my notes about using the 77 as a tow rig.
3) If you're asking about gear brands, which I think you are, you can just buy an axle from a junk yard to swap with either instead of buying brand new gears as long as you use a stock ratio, like 4.10 and 3.55 are. Sterling 10.25 axles are nearly bullet proof and will likely outlast the rest of the truck anyway, so I wouldn't be scared to use one with an unknown history as long as you check the gear oil for metal shavings to be sure.
1) Yes the gears will change between the two, but if you were going to swap them, I'd swap the whole axle to save trouble.
2) Refer to my notes about using the 77 as a tow rig.
3) If you're asking about gear brands, which I think you are, you can just buy an axle from a junk yard to swap with either instead of buying brand new gears as long as you use a stock ratio, like 4.10 and 3.55 are. Sterling 10.25 axles are nearly bullet proof and will likely outlast the rest of the truck anyway, so I wouldn't be scared to use one with an unknown history as long as you check the gear oil for metal shavings to be sure.
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Senior User
Joined: Oct 2008
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From: Toronto, On
I don't want to go and buy a whole other axle just for the ring and pinion. The axle I have in the 77' is just fine. And I can't have a dually with a SRW axle.
I know 4.10's are a great towing gear, but a lot of driving will be on the hwy an in the city, so I need a good mpg. That's why I was thinking of going with 3.55 an a gear vendors overdrive unit with the ZF5. So I could run that low gear ratio and get good towing thanks to the overdrive unit splitting 2nd, 3rd, and 4th, and also get good mpg by having a double overdrive unloaded on the highway. Kinda like having cake and eating it
I know 4.10's are a great towing gear, but a lot of driving will be on the hwy an in the city, so I need a good mpg. That's why I was thinking of going with 3.55 an a gear vendors overdrive unit with the ZF5. So I could run that low gear ratio and get good towing thanks to the overdrive unit splitting 2nd, 3rd, and 4th, and also get good mpg by having a double overdrive unloaded on the highway. Kinda like having cake and eating it
Cargo Master
Joined: Jan 2004
Posts: 3,118
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From: South Dakota
One thing though, will that diesel ZF-5 transmission work in your '77 F-350?
Senior User
Joined: May 2007
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There is no reason to put in a GV unit AND change the gear ratio down, unless you really need another gear (you don't, you already have 5)
Figure out what highway RPM you want at 65 based on your tires and transmission. pick the gears that get that for you.
OR
You could also just get the overdrive and leave the 4.10s there, giving you an extra highway gear for when you're not loaded.
your truck is going to be a triple lugging pig with double overdrive and a 3.55; that's not getting you any mileage.
Figure out what highway RPM you want at 65 based on your tires and transmission. pick the gears that get that for you.
OR
You could also just get the overdrive and leave the 4.10s there, giving you an extra highway gear for when you're not loaded.
your truck is going to be a triple lugging pig with double overdrive and a 3.55; that's not getting you any mileage.
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Logistics Pro
Joined: Mar 2011
Posts: 4,197
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From: Central Wisconsin
I don't want to go and buy a whole other axle just for the ring and pinion. The axle I have in the 77' is just fine. And I can't have a dually with a SRW axle.
I know 4.10's are a great towing gear, but a lot of driving will be on the hwy an in the city, so I need a good mpg. That's why I was thinking of going with 3.55 an a gear vendors overdrive unit with the ZF5. So I could run that low gear ratio and get good towing thanks to the overdrive unit splitting 2nd, 3rd, and 4th, and also get good mpg by having a double overdrive unloaded on the highway. Kinda like having cake and eating it
I know 4.10's are a great towing gear, but a lot of driving will be on the hwy an in the city, so I need a good mpg. That's why I was thinking of going with 3.55 an a gear vendors overdrive unit with the ZF5. So I could run that low gear ratio and get good towing thanks to the overdrive unit splitting 2nd, 3rd, and 4th, and also get good mpg by having a double overdrive unloaded on the highway. Kinda like having cake and eating it
FTE Legend
Joined: Jun 2006
Posts: 31,930
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From: Ottawa, Ontario
But what is the optimal engine rpm on the IDI? It redlines at 3000rom or something doesn't it so you probably want cruising rpm to be around 2000rpm. Go to this site and input all the drivetrain specs to see what rpm the engine will turn at various speeds.
Gear Ratio Calculator
Gear Ratio Calculator
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