Rear axle code a mystery
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Junior User
Joined: Jun 2004
Posts: 57
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From: Northern New Jersey
Rear axle code a mystery
After reading the posts here I looked at my door sticker under axle code and it says G6. The truck is a 94 DRW 7.3 IDI Turbo Crew Cab. THIS is the kind of truck that should have a steerable rear! Anyway, I hardly ever pull more than 5000 pounds. From what Dave S. posts about speed and RPM I think I have the 4.10 rear. I'd like to put bigger tires on for lower RPM on the wide open highways of New Jersey. Any ideas?
Thanks
Thanks
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
With dual rear wheels you have to be very careful about your tire width. To wide and they will rub ogether between the tires. A blowout is the next thing to happen soon after that.
If you have a two wheel drive truck the 3.55 gears will not cost that much to buy and install.
What tranny do you have and what size tires are you running now?
If you have a two wheel drive truck the 3.55 gears will not cost that much to buy and install.
What tranny do you have and what size tires are you running now?
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I do not have an axle code decoder, I made a worksheet to calculate the tire diameter, rear axle ratio, tranny drive ratio, and engine RPM to come up with the speed.
I looked up a LT215/85-16 Bridgestone All Season tire size specs.
From what I see there you are going to have a hard time putting bigger tires on your truck without changing wheels.
If you only have an inch between the tires now, when you put a good load on it they are probably a lot closer.
To go to a LT235/85 -16 All season the tire is 1.6" taller and .8 inches wider. I do not think this tire will fit without rubbing between the tires. And the speed difference is minimal.
LT215/85R16 (30.4" tall) at 2000 RPM A4OD in OD 4.10 gears comes up with 62.13 MPH and an over width of 8.7".
LT235/85R16 ( 32" tall) at 2000 RPM A4OD in OD 4.10 gears comes up with 65.4 MPH and an overall width of 9.5".
I think a 3.55 or 3.73 gear is a better idea for you cost to benifit wise.
I looked up a LT215/85-16 Bridgestone All Season tire size specs.
From what I see there you are going to have a hard time putting bigger tires on your truck without changing wheels.
If you only have an inch between the tires now, when you put a good load on it they are probably a lot closer.
To go to a LT235/85 -16 All season the tire is 1.6" taller and .8 inches wider. I do not think this tire will fit without rubbing between the tires. And the speed difference is minimal.
LT215/85R16 (30.4" tall) at 2000 RPM A4OD in OD 4.10 gears comes up with 62.13 MPH and an over width of 8.7".
LT235/85R16 ( 32" tall) at 2000 RPM A4OD in OD 4.10 gears comes up with 65.4 MPH and an overall width of 9.5".
I think a 3.55 or 3.73 gear is a better idea for you cost to benifit wise.
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Junior User
Joined: Jun 2004
Posts: 57
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From: Northern New Jersey
Thanks. I'm going to try to match up that speedo/tach combo this morning. I'm also going to measure the distance between the rear tires. I'll come up with something. Sounds like you may be right that the gearing is the right choice. I've put pistons in; main bearings; transfer cases; driveshafts; turbine engines; rotor blades; fuel tanks; and windsheild wipers in gas burners and Hueys. I could probably put the gears in. Special tools needed? The rear has got 200k on it, so it might be good PM to do anyway. Do these things wear out?
Speaking of wipers I could not shut mine off yesterday in the rain or put them on intermittent. Later in the evening I tried them and they parked.
1994 CC DRW F350 IDI XLT (installing bow thrusters)
Speaking of wipers I could not shut mine off yesterday in the rain or put them on intermittent. Later in the evening I tried them and they parked.
1994 CC DRW F350 IDI XLT (installing bow thrusters)
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
The thingis getting everything set right.
Backlash
Where the ring and pinion mesh
How deep they mesh
Bearing loads
I have a good friend that does that for a living.
He bead blasts everythig to clean it up.
Has the tools and place.
Has a selection of parts.
Stands behind his work.
If he puts it together, I do not have to wonder if it is right.
The most common thing is damage from improper installation or neglect of fluid levels.
Next most common is something else fails, and the debris from that eats the gears.
But everything man made does wear out sometime.
Good time to change seals, inspect and replace bearings as needed, change fluid and swab out all the garbage from the last 200K.
They should have fluid changes and inspections like everything else on a truck.
A hundred in servicing the differentials can save you a thousand in broken stuff if it fails.
Backlash
Where the ring and pinion mesh
How deep they mesh
Bearing loads
I have a good friend that does that for a living.
He bead blasts everythig to clean it up.
Has the tools and place.
Has a selection of parts.
Stands behind his work.
If he puts it together, I do not have to wonder if it is right.
The most common thing is damage from improper installation or neglect of fluid levels.
Next most common is something else fails, and the debris from that eats the gears.
But everything man made does wear out sometime.
Good time to change seals, inspect and replace bearings as needed, change fluid and swab out all the garbage from the last 200K.
They should have fluid changes and inspections like everything else on a truck.
A hundred in servicing the differentials can save you a thousand in broken stuff if it fails.
Elder User
Joined: Aug 2003
Posts: 692
Likes: 0
From: newfoundland canada
My list of axle codes does not show a G6 listed,however it does show a C6 which is a limited slip with 4.56 gears.Take another look at the code to confirm it is a G and not a C,hope this helps.
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