Thx
Gear Ratio?!
Started by
Guest_Fordbronco69_*
, May 08 2004 09:24 PM
7 replies to this topic
#2
Guest_Stephen Hawk_*
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Posted 08 May 2004 - 10:13 PM
There is supposed to be a small metal tag bolted onto the differential from the factory with the specs stamped on it like gear ratio, trak-lok ect. It should be bolted on with one of the cover bolts on the dana and the third member bolts on the 9". The only otherway is to open them up and count your ring gear teeth and divide by the pinion gear teeth. Unless you're sure its never been changed then look in a haynes or chiltons manual for your year model.
#3
STLKIKN
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Posted 09 May 2004 - 01:18 AM
If your truck hasn't been modified from stock, on the VIN plate on the glovebox door, there is a space for "axle."
This code will give you the factory installed gear ratios.
If you have a 302 you most likely have 3.50 and 3.54 gearing.
If you have the 170ci 6 cyl, the gears are more than likely 4.10 and 4.11.
Post your axle code, someone will decipher it for you.
Just re-read your post... obviously it has been modified from stock if it has a 44 front.. Your best bet is going to be to pull the front cover. Depending on the gear manufacturer, you will either have to count teeth and divide, or the number of teeth will be stamped on the ring gear.
This code will give you the factory installed gear ratios.
If you have a 302 you most likely have 3.50 and 3.54 gearing.
If you have the 170ci 6 cyl, the gears are more than likely 4.10 and 4.11.
Post your axle code, someone will decipher it for you.
Just re-read your post... obviously it has been modified from stock if it has a 44 front.. Your best bet is going to be to pull the front cover. Depending on the gear manufacturer, you will either have to count teeth and divide, or the number of teeth will be stamped on the ring gear.
#4
Txquadhunter
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Posted 09 May 2004 - 09:04 PM
78-79 Bronco's never had 302's or 351w's 351m/400. Most likely ratio will be 3.50 Front and 3.50 rear. The axle code is found on the tag on the end of the door. So if the door and/or axles never been replaced will be the easist place. going by memory here so don't quote me axle code 14 is 3.50.
#6
Guest_unreng_*
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Posted 27 May 2004 - 05:46 AM
Fb69,
put the truck in four wheel drive. mark both driveshafts with a visible mark (that can be seen from the side of the vehicle).
for the rear:
1. chock the front tires
2. lift the rear axle until the tires clear the ground
3. count the number of times the driveshaft turns as the tire is rotated through one complete revolution.
for the front:
1. same as the rear, but reversed.
hope this helps.
chris
put the truck in four wheel drive. mark both driveshafts with a visible mark (that can be seen from the side of the vehicle).
for the rear:
1. chock the front tires
2. lift the rear axle until the tires clear the ground
3. count the number of times the driveshaft turns as the tire is rotated through one complete revolution.
for the front:
1. same as the rear, but reversed.
hope this helps.
chris
#7
Guest_Ice Man 860_*
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Posted 27 May 2004 - 10:59 PM
another way wich also gives u a good chance 2 inspect and replace the oil in your pumpkins is to go out and get some 90 weight and the gaskets for the pumpkins. then drain them and crack em open. then count the teeth on the ring and pinion gears. then u simply divide the number of teeth on the ring gear by the number of teeth on the pinion gear ie. 39 teeth on the ring gear & 11 teeth on the pinion gear = 39/11= 3.54...
if your pumpkins are anything like mine you are probaly need to replace the gasket any ways, so just "kill 2 birds w/ one stone"
if your pumpkins are anything like mine you are probaly need to replace the gasket any ways, so just "kill 2 birds w/ one stone"
#8
Seabronc
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Posted 28 May 2004 - 06:38 PM
unrenq's method is the easiest way, but if you have a limited slip differential vs a locker, you should rotate both tires at the same time. For that you will need a friend turning one wheel at the same speed you are while you count the shaft revs.
Good luck,
Good luck,
"I know you think you know what I said, but what you need to know is, I did'nt say what I meant"
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