What gear do I need in my rear end and front axle
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What gear do I need in my rear end and front axle
Okay here's what happened hooked boat up to truck today ----20 ft procraft with 200 mercury--- my truck 12 in lifted 94 f350 4x4 5.8 351w
3 speed auto with 86 axles 4.10 gears--- dana 60 front---10.25 rear end---37 in tires 12.5 wide by 16.5----acted like it had one hell of load behind it temp climbed to 220 and stayed in that area---now every things new on this truck I mean new---engine less than 100 miles on it---radiator 3 core aluminum with dual fans 180 thermostat-----I'am thinking its the gears that causing it to feel like that it pulled it but had to lay on it every time starting off from slowing down or braking-- had some advice to put 4.88 gears in it said would increase rpm around 500 not that bad--- any thoughts on what I might should do--all thoughts welcomed--thank u
3 speed auto with 86 axles 4.10 gears--- dana 60 front---10.25 rear end---37 in tires 12.5 wide by 16.5----acted like it had one hell of load behind it temp climbed to 220 and stayed in that area---now every things new on this truck I mean new---engine less than 100 miles on it---radiator 3 core aluminum with dual fans 180 thermostat-----I'am thinking its the gears that causing it to feel like that it pulled it but had to lay on it every time starting off from slowing down or braking-- had some advice to put 4.88 gears in it said would increase rpm around 500 not that bad--- any thoughts on what I might should do--all thoughts welcomed--thank u
Fleet Owner
Joined: Jan 2004
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From: Brentwood,CA
Well a C6 transmission without a lockup is going to get very hot. It also has a terrible low gear, that compounded with 37's and 4.10 gears will act as you described. I would be looking at 5.13 gears for this.
Lead Driver
Joined: Feb 2013
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From: Roseville, MN
Did you have any experience with the 4.10 gears and stock tires (~32") with that load? 4.88 gears would put you back pretty close to that setup. That setup would give you about 2700 rpm at 60 mph, a little over 3100 at 70 mph (a C6 is not a great trans for both towing and going fast, something with an overdrive wouldn't require giving one up to get the other).
Yes, 5.13 gears would give you more get up and go than 4.88s. They'd also put you at about 2800 rpm at 60 and close to 3300 rpm at 70.
I can't say which would be a better setup for you.
Yes, 5.13 gears would give you more get up and go than 4.88s. They'd also put you at about 2800 rpm at 60 and close to 3300 rpm at 70.
I can't say which would be a better setup for you.
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no experience at original setup was already lifted when I got it-----what do u think is max rpm I should run at on long way like I 95 just driving it to go fishing not everyday----would 3500 be too much-----
Lead Driver
Joined: Feb 2013
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From: Roseville, MN
Personally I like keeping it below about 2500 rpm. It's just to busy / buzzy above that and not pleasant to drive.
But keep in mind that when trucks were getting the C6 trans the speed limit was generally 55 mph. Like I said above, it's not a great trans for both towing and going fast, because when it was built it didn't have to go fast. So you're going to have to compromise on one or the other (or get an overdrive).
Back to "is 3500 rpm too fast?" I can't really say. It'll hold up for a while doing that. But I don't know how long "a while" is. Maybe a really long time, maybe not. And maybe others can give you a better answer.
But keep in mind that when trucks were getting the C6 trans the speed limit was generally 55 mph. Like I said above, it's not a great trans for both towing and going fast, because when it was built it didn't have to go fast. So you're going to have to compromise on one or the other (or get an overdrive).
Back to "is 3500 rpm too fast?" I can't really say. It'll hold up for a while doing that. But I don't know how long "a while" is. Maybe a really long time, maybe not. And maybe others can give you a better answer.
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How attached are you to that 12” lift? If you stepped down to say a 6” lift and a 35” tire there would be a lot less stuff pushing air.
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i ain't rite
Joined: Mar 2005
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From: Marlboro Mental Hospital.
a truck is going to "push the same amount of air" if it has a 24 inch lift, or stock height.
the tire size and gear ratio is what is killing the power band.
and there is no need for 6 inch lift with 35 inch tires. i have 37's on a 4 inch lift.
the tire size and gear ratio is what is killing the power band.
and there is no need for 6 inch lift with 35 inch tires. i have 37's on a 4 inch lift.
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