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Old 09-09-2005, 11:02   #1 (permalink)
Steve
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8.8 diff backlash

I recently purchased a 95 Mustang GT. I have a vibration from 90 MPH and up.
I've pinpointed it to the diff. The gears were changed to 3.55's, but the
set up was not well done. I checked the backlash and I have .020 backlash,
which I think is too much. I checked my shim thickness, LH 0.251, RH 0.388.
I want to bring the backlash down .010. So, I need to reduce .020 on the
left and add .020 on the right. I need 0.231 on the left and 0.408 on the
right. Ford does not make the shims in these sizes. I'm assuming the pinion
is set too far out. So my question is, Is there some kind of calculation, or
does someone know how to set the pinion depth, with the info given, so I can
adjust the backlash properly with the side shims available? So that I do not
have to buy the tool to set pinion depth. Example, adding a .005 shim to the
pinion to get less backlash. In other words, adjusting the backlash with
pinion depth. I know, this one's a doozy.
Thanks in advance,
Steve


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Old 09-09-2005, 13:01   #2 (permalink)
aarcuda69062
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Posts: n/a
Re: 8.8 diff backlash

In article <q2jUe.24546$FI2.798634@wagner.videotron.net>,
"Steve" <stevchev@videotron.ca> wrote:

> I recently purchased a 95 Mustang GT. I have a vibration from 90 MPH and up.
> I've pinpointed it to the diff. The gears were changed to 3.55's, but the
> set up was not well done. I checked the backlash and I have .020 backlash,
> which I think is too much. I checked my shim thickness, LH 0.251, RH 0.388.
> I want to bring the backlash down .010. So, I need to reduce .020 on the
> left and add .020 on the right. I need 0.231 on the left and 0.408 on the
> right. Ford does not make the shims in these sizes. I'm assuming the pinion
> is set too far out. So my question is, Is there some kind of calculation, or
> does someone know how to set the pinion depth, with the info given, so I can
> adjust the backlash properly with the side shims available? So that I do not
> have to buy the tool to set pinion depth. Example, adding a .005 shim to the
> pinion to get less backlash. In other words, adjusting the backlash with
> pinion depth. I know, this one's a doozy.
> Thanks in advance,
> Steve


Don't use pinion depth to adjust backlash.

Pinion depth is set long before backlash is adjusted, pinion
depth is set where it is supposed to be and then left alone.
To be done properly, it should be done with the proper measuring
tools. The ProForm tool is $100 thru Summit racing.
Aftermarket side shims for backlash can be had from any of the
common vendors that deal with rear axle parts, Randy's Ring and
Pinion is probably your best bet. the aftermarket shims can be
combined to achieve what ever size you need.
Backlash and bearing preload need to be considered all at once
when selecting the correct shim size.
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Old 09-09-2005, 16:02   #3 (permalink)
Shoe Salesman
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Posts: n/a
Re: 8.8 diff backlash


"Steve" <stevchev@videotron.ca> wrote in message
news:q2jUe.24546$FI2.798634@wagner.videotron.net...
>I recently purchased a 95 Mustang GT. I have a vibration from 90 MPH and
>up. I've pinpointed it to the diff. The gears were changed to 3.55's, but
>the set up was not well done. I checked the backlash and I have .020
>backlash, which I think is too much. I checked my shim thickness, LH
>0.251, RH 0.388. I want to bring the backlash down .010. So, I need to
>reduce .020 on the left and add .020 on the right. I need 0.231 on the left
>and 0.408 on the right. Ford does not make the shims in these sizes. I'm
>assuming the pinion is set too far out. So my question is, Is there some
>kind of calculation, or does someone know how to set the pinion depth, with
>the info given, so I can adjust the backlash properly with the side shims
>available? So that I do not have to buy the tool to set pinion depth.
>Example, adding a .005 shim to the pinion to get less backlash. In other
>words, adjusting the backlash with pinion depth. I know, this one's a
>doozy.
> Thanks in advance,
> Steve


You are trying to cure a high-speed vibration by adusting back-lash ? I
think your barking up the wrong tree. Try balancing and rotating tires. If
the rear-end isn't making any noise I wouldn't worry about it.....


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Old 09-09-2005, 17:01   #4 (permalink)
fordman3@hotmail.com
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Posts: n/a
Re: 8.8 diff backlash

On Fri, 09 Sep 2005 19:25:24 GMT, aarcuda69062
<nonelson@sbcglobal.net> wrote:

>In article <q2jUe.24546$FI2.798634@wagner.videotron.net>,
> "Steve" <stevchev@videotron.ca> wrote:
>
>> I recently purchased a 95 Mustang GT. I have a vibration from 90 MPH and up.
>> I've pinpointed it to the diff. The gears were changed to 3.55's, but the
>> set up was not well done. I checked the backlash and I have .020 backlash,
>> which I think is too much. I checked my shim thickness, LH 0.251, RH 0.388.
>> I want to bring the backlash down .010. So, I need to reduce .020 on the
>> left and add .020 on the right. I need 0.231 on the left and 0.408 on the
>> right. Ford does not make the shims in these sizes. I'm assuming the pinion
>> is set too far out. So my question is, Is there some kind of calculation, or
>> does someone know how to set the pinion depth, with the info given, so I can
>> adjust the backlash properly with the side shims available? So that I do not
>> have to buy the tool to set pinion depth. Example, adding a .005 shim to the
>> pinion to get less backlash. In other words, adjusting the backlash with
>> pinion depth. I know, this one's a doozy.
>> Thanks in advance,
>> Steve

>
>Don't use pinion depth to adjust backlash.
>
>Pinion depth is set long before backlash is adjusted, pinion
>depth is set where it is supposed to be and then left alone.
>To be done properly, it should be done with the proper measuring
>tools. The ProForm tool is $100 thru Summit racing.
>Aftermarket side shims for backlash can be had from any of the
>common vendors that deal with rear axle parts, Randy's Ring and
>Pinion is probably your best bet. the aftermarket shims can be
>combined to achieve what ever size you need.
>Backlash and bearing preload need to be considered all at once
>when selecting the correct shim size.


this would depend on gear pattern
both pinion and ring may have to be shimmed to find suitable
pattern
i have pinion bearings which have been ground out a bot for ez removel
and addand subtract shims to achieve a proper pattern

h
u
r
c
a
s
t

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Old 09-09-2005, 18:01   #5 (permalink)
aarcuda69062
Guest
 
Posts: n/a
Re: 8.8 diff backlash

In article <v454i1tuul95cs17d8sb3lfcbapbbkhkaa@4ax.com>,
fordman3@hotmail.com wrote:

> On Fri, 09 Sep 2005 19:25:24 GMT, aarcuda69062
> <nonelson@sbcglobal.net> wrote:
>
> >In article <q2jUe.24546$FI2.798634@wagner.videotron.net>,
> > "Steve" <stevchev@videotron.ca> wrote:
> >
> >> I recently purchased a 95 Mustang GT. I have a vibration from 90 MPH and
> >> up.
> >> I've pinpointed it to the diff. The gears were changed to 3.55's, but the
> >> set up was not well done. I checked the backlash and I have .020 backlash,
> >> which I think is too much. I checked my shim thickness, LH 0.251, RH
> >> 0.388.
> >> I want to bring the backlash down .010. So, I need to reduce .020 on the
> >> left and add .020 on the right. I need 0.231 on the left and 0.408 on the
> >> right. Ford does not make the shims in these sizes. I'm assuming the
> >> pinion
> >> is set too far out. So my question is, Is there some kind of calculation,
> >> or
> >> does someone know how to set the pinion depth, with the info given, so I
> >> can
> >> adjust the backlash properly with the side shims available? So that I do
> >> not
> >> have to buy the tool to set pinion depth. Example, adding a .005 shim to
> >> the
> >> pinion to get less backlash. In other words, adjusting the backlash with
> >> pinion depth. I know, this one's a doozy.
> >> Thanks in advance,
> >> Steve

> >
> >Don't use pinion depth to adjust backlash.
> >
> >Pinion depth is set long before backlash is adjusted, pinion
> >depth is set where it is supposed to be and then left alone.
> >To be done properly, it should be done with the proper measuring
> >tools. The ProForm tool is $100 thru Summit racing.
> >Aftermarket side shims for backlash can be had from any of the
> >common vendors that deal with rear axle parts, Randy's Ring and
> >Pinion is probably your best bet. the aftermarket shims can be
> >combined to achieve what ever size you need.
> >Backlash and bearing preload need to be considered all at once
> >when selecting the correct shim size.

>
> this would depend on gear pattern


No point patterning a set up that is known to be assembled wrong
and has way too much backlash.

> both pinion and ring may have to be shimmed to find suitable
> pattern


Indeed, that is the procedure.
The OP would be well advised to start from scratch, or have
someone with the tools and knowledge to start from scratch.

> i have pinion bearings which have been ground out a bot for ez removel
> and addand subtract shims to achieve a proper pattern


Mine aren't "ground out", I had them honed on a Sunnen Rod hone.
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Old 09-09-2005, 18:01   #6 (permalink)
Jim Warman
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Posts: n/a
Re: 8.8 diff backlash

Would it not be simpler to use the correct tools (which your dealership
should possess) to select the correct pinion shim in one simple operation? I
would think that a Master tech would have passed Specialty 36 and learned
how to use these tools.



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Old 09-10-2005, 11:01   #7 (permalink)
fordman3@hotmail.com
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Posts: n/a
Re: 8.8 diff backlash

On Sat, 10 Sep 2005 00:48:29 GMT, "Jim Warman"
<mechanic@tenalpsulet.net> wrote:

>Would it not be simpler to use the correct tools (which your dealership
>should possess) to select the correct pinion shim in one simple operation? I
>would think that a Master tech would have passed Specialty 36 and learned
>how to use these tools.
>
>

lmfao
warman admitts to steeling tools

THIEF


hurc ast
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Old 09-10-2005, 13:01   #8 (permalink)
tom
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Posts: n/a
Re: 8.8 diff backlash

and the resident rectal orifice admits to being an idiot that has no idea
what is going on in real life.
<fordman3@hotmail.com> wrote in message
news:pr16i1p6oe610nnue2rec8al3obefdlpa2@4ax.com...
> On Sat, 10 Sep 2005 00:48:29 GMT, "Jim Warman"
> <mechanic@tenalpsulet.net> wrote:
>
> >Would it not be simpler to use the correct tools (which your dealership
> >should possess) to select the correct pinion shim in one simple

operation? I
> >would think that a Master tech would have passed Specialty 36 and learned
> >how to use these tools.
> >
> >

> lmfao
> warman admitts to steeling tools
>
> THIEF
>
>
> hurc ast



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Old 09-10-2005, 14:01   #9 (permalink)
Steve
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Posts: n/a
Re: 8.8 diff backlash

Hi Jim,
I'm not a Ford technician, so I don't know what specialty 36 is.
I am however a GM tecnician and have been doing trannys, transfer cases, and
diffs for years. Unfortunatly I don't have access to the tool required to
set pinion depth, and don't really want to buy it for a one time use. That
was the purpose of my question regarding backlash and pinion depth. You
don't think setting my pinion in 5 or 10 thou will help me set my backlash
properly with the shims available from Ford?
"Jim Warman" <mechanic@tenalpsulet.net> wrote in message
news:x3qUe.222078$9A2.26508@edtnps89...
> Would it not be simpler to use the correct tools (which your dealership
> should possess) to select the correct pinion shim in one simple operation?
> I
> would think that a Master tech would have passed Specialty 36 and learned
> how to use these tools.
>
>
>



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Old 09-10-2005, 16:01   #10 (permalink)
tom
Guest
 
Posts: n/a
Re: 8.8 diff backlash

Steve, just for your information, Jim was not flaming you with that spec 36
tidbit, but rather baiting the resident rectal orifice that this week is
going by the name of fordman something or other, and signs off as hurc ast
the rectal orifice. his sole reason for posting here is to give people bad,
dangerous advice, and to start flaming wars.(hurc that is)
"Steve" <stevchev@videotron.ca> wrote in message
news:F4HUe.41859$FI2.1320054@wagner.videotron.net...
> Hi Jim,
> I'm not a Ford technician, so I don't know what specialty 36

is.
> I am however a GM tecnician and have been doing trannys, transfer cases,

and
> diffs for years. Unfortunatly I don't have access to the tool required to
> set pinion depth, and don't really want to buy it for a one time use. That
> was the purpose of my question regarding backlash and pinion depth. You
> don't think setting my pinion in 5 or 10 thou will help me set my backlash
> properly with the shims available from Ford?
> "Jim Warman" <mechanic@tenalpsulet.net> wrote in message
> news:x3qUe.222078$9A2.26508@edtnps89...
> > Would it not be simpler to use the correct tools (which your dealership
> > should possess) to select the correct pinion shim in one simple

operation?
> > I
> > would think that a Master tech would have passed Specialty 36 and

learned
> > how to use these tools.
> >
> >
> >

>
>



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