smart51
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| posted on 26/9/07 at 02:08 PM |
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changing sierra diff ratio
Given these Sierra diff ratios:
44 : 14 = 3.14
44 : 13 = 3.38
47 : 13 = 3.62
47 : 12 = 3.92
could you just swap the crown wheel to convert a 3.62 to a 3.38? If money were no object, could you have a 40 tooth crown wheel made and convert it
to a 3.08 or does it not work like that?
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Fatgadget
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| posted on 26/9/07 at 02:22 PM |
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Ummm I think if it was doable somebody would have done it already!
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02GF74
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| posted on 26/9/07 at 02:28 PM |
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well i am no gear expect but I would expect that the crown wheel has to match the pinion.
if you are adding or removing teeth from the crown wheel and it is the same diameter, then the teeth will become larger or smaller - the teeth on the
pinion would need to change in the same way to mesh properly - the teeth are curved bevells (is that the right name?) I would have thought.
Or if the teeth on crown wheel are the same size, the diameter of the crown wheel has to increase or decrease as you add or remove teeth. Now in this
case you would need to move position of the pinion, and the bit I am not sure of, is the angle of the pinion teeth need to change again to mesh
correctly. You may be lucky that the angle won't change so much when you have a large number of teeth but I would expect it to not work well -
there are enough horror stories about correct backlash with Land Rover diffs and those use matching crown wheel/pinion to suggest it won't work
and/or last long.
[Edited on 26/9/07 by 02GF74]
VVVVVV mr bearing kit has sumarise all that ^^^ far better.
[Edited on 26/9/07 by 02GF74]
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smart51
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| posted on 26/9/07 at 02:32 PM |
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I was thinking that maybe there is a range of sizes that will work and as they have 13 tooth pinions in the 3.38 and 3.62, they may be the same.
There is a bit of slack in the sierra diff after all.
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BearingKits
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| posted on 26/9/07 at 02:35 PM |
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Each set of gears is made as a matched pair.
If you look on the edge of most crownwheels you will see a number written with an engraving tool. The number will also appear on the pinion either on
the flat surface where the teeth end or between the two pinion bearings.
Normally Ford gears have 3 digits like 121 for example.
Mixing pairs of the same gears is not advisable.
You cannot mix different gears as they will not mesh.
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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blakep82
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| posted on 26/9/07 at 02:36 PM |
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were all sierra the same ratio? atlas axles are easy enough to get new ratios for. kits are always crown wheel and pinion. so yeah, a new pinion gear
would be needed
________________________
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stevec
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| posted on 26/9/07 at 03:15 PM |
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quote:
Originally posted by BearingKits
Each set of gears is made as a matched pair.
If you look on the edge of most crownwheels you will see a number written with an engraving tool. The number will also appear on the pinion either on
the flat surface where the teeth end or between the two pinion bearings.
Normally Ford gears have 3 digits like 121 for example.
Mixing pairs of the same gears is not advisable.
You cannot mix different gears as they will not mesh.
What he said.
Steve.
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mcerd1
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| posted on 26/9/07 at 03:55 PM |
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quote:
Originally posted by smart51
If money were no object, could you have a 40 tooth crown wheel made...
if money really were no object you could get a new pinion made too
there are already 4.1 and 4.44 kits out there for sierra 7" diffs
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BearingKits
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| posted on 26/9/07 at 05:46 PM |
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3.14 are also available
quite expensive tho' at around £540+vat
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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Simon
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| posted on 26/9/07 at 07:01 PM |
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Much as I hate to have to ask, but does anyone know a good engineering company in the far east where we can all get 3.14 f/drive sets made for about
70 quid.
ATB
Simon
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ReMan
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| posted on 26/9/07 at 09:08 PM |
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If money were no object, you definatly would'nt be using a Sierra diff at all
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bj928
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| posted on 26/9/07 at 09:26 PM |
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quote:
Originally posted by ReMan
If money were no object, you definatly would'nt be using a Sierra diff at all
i'm not using a sierra diff, i'm using a mustang 8.8 with a nice 2.73 gear, if your running a 7.5 sierra diff, you may be able to get a
few extra ratios from america.
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James
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| posted on 27/9/07 at 01:31 AM |
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Thought this was Locostbuilders???
What's wrong with using a couple of discs of metal and an angle grinder????
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"The fight is won or lost far away from witnesses, behind the lines, in the gym and out there on the road, long before I dance under those lights."
- Muhammad Ali
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