9" Rearend Identification -Salvage Yard Search
darryl....@fmr.com
If I go to a salvage yard and have several 9" rearend pumpkins lie
before me
1) How do I identify gear ratios (4.11 v.s. 3.89 v.s. 3.50) ?
2) How do I determine if it's a posi-traction unit ?
3) Is there a difference between a posi-traction unit and a locker, or
is it simply two terms used to describe the same component type ?
Please feel free to provide additional information.
Thanks in advance (TIA)
Cheers,
-D
################################################################
Email: darryl....@fmr.com
Disclaimer: The opinions expressed herein are my own and in
no way reflects the same of my employer.
All recommendations and advice must be verified
to be accurate by the recipient before implementation.
#############################################################################
FE Tate
IS "TRACTION LOK" SHOULD BE A CLUTCH TYPE DIFF. LOCKER IS RATCHET TYPE
UNIT.
Dan Amborn
If you have the 9" in the housing yet chances are that they will have the
tag bolted to the housing. Its usually on one of the bolts attaching the
third member to the housing. I think in the lower half of the bolt
pattern. The tag will be rectangular and look like so:
---------------------------------
xxxxx xxxxx xxxxx
3L50 xxxxx
---------------------------------
The L signifies a traction lock rear end. If it has nothing or a dot there
its a regular open rear end.
To determine if its a traction lock if its out of it housing look at the
center of the differential between the two bearing supports. Turn it over
by hand until you can see the hole going into it to the spider gears (most
have holes). If its pretty much open in there with just the gears and
cross shaft its an open rear. If it has a mount block in there and springs
its a traction lock. Some traction locks have four pinion gears and these
are the ones to have. These are roughly twice as strong. Also beware of
spline count. There are 28 and 31 spline axles.
I've never had much experience with Detroit Lockers but I would say that
these would stick out of a crowd if you saw them. As far as reading the
tags on these I think the L designation still applies between the gear
ratio. It would only be on the 4.11 or higher so you would have to then
figure out the codes further to really know what's in there at that point.
No real experience with these just years of common sense and reading
Mustang Monthly along with the other Ford magazines.
--
Dan Amborn
dam...@hutchtel.net
dam...@geocities.com
http://www.geocities.com/~damborn/
------------------------------------
Sometimes you feel like a nut,
sometimes you don't
------------------------------------
Another 92
If your lucky, there will be a metal tag attached to one of the
bolts with the ratio stamped on it. If not, you will have to either
estimate by turning an axle one revolution and count how many
times the yoke spins, example, 1 turn of the axle, 3 1/2 of the yoke,
you would have something near a 3.50 to 1 rear end.
Or divide the pinion gear number of teeth
into the ring gear teeth.
To see if it's a locker, GM uses the Posi-traction name,
turn an axle, if the one one the other side turns in the same
direction, it's a locker, if it turns the opposite way, it's not.
--
Any day above ground, is a good day. http://www.webcom.com/sharks/ford.html
George Burns
darryl....@fmr.com wrote in article
<32c3f34c...@news-srv2.fmr.com>...
coby hughey
In article <01bbf48a$84ccd060$792b...@stogner.ix.netcom.com>,
*sha...@webcom.com* spouts...
>To see if it's a locker, GM uses the Posi-traction name,
>turn an axle, if the one one the other side turns in the same
>direction, it's a locker, if it turns the opposite way, it's not.
>
I think you mean a limited slip, not a locker. Posi and limited slip are
different names for the same thing; a locker is different.(an automatic locker
like the Detroit is rather harsh for a street car; but great in a 4x4). Also,
that method only works if the limited slip is not worn out. The clutch packs
in most types of limited slip diffs can and do wear out, and require a special
additive added to their fluid. (automatic lockers do not wear out). There is
several types of limited slip that do not wear out or change their preload;
they are the gear type(good example is the Dyneer TrueTrac, which is a nice,
stiff limited slip that won't wear out)
coby
>--
>Any day above ground, is a good day. http://www.webcom.com/sharks/ford.html
>
> George Burns
>
>darryl....@fmr.com wrote in article
><32c3f34c...@news-srv2.fmr.com>...
>> If I go to a salvage yard and have several 9" rearend pumpkins lie
>> before me
>>
>> 1) How do I identify gear ratios (4.11 v.s. 3.89 v.s. 3.50) ?
>>
>>
>> 2) How do I determine if it's a posi-traction unit ?
>>
>>
>> 3) Is there a difference between a posi-traction unit and a locker, or
>> is it simply two terms used to describe the same component type ?
>>
>>
>> Please feel free to provide additional information.
>>
>> Thanks in advance (TIA)
>>
>> Cheers,
>>
>> -D
>> ################################################################
>>
>> Email: darryl....@fmr.com
>>
>> Disclaimer: The opinions expressed herein are my own and in
>> no way reflects the same of my employer.
>> All recommendations and advice must be verified
>> to be accurate by the recipient before implementation.
>>
>>
>############################################################################
>#
>>
--
Coby Hughey
"By US Code Title 47, Sec.227(a)(2)(B), a computer/modem/printer meets the
definition of a telephone fax machine. By Sec.227(b)(1)(C), it is unlawful to
send any unsolicited advertisement to such equipment. By
Sec.227(b)(3)(C), a violation of the aforementioned Section is punishable by
action to
recover actual monetary loss, or $500, whichever is greater, for each
violation."
Brian Grimshaw
darryl....@fmr.com wrote:
>
> If I go to a salvage yard and have several 9" rearend pumpkins lie
> before me
>
> 1) How do I identify gear ratios (4.11 v.s. 3.89 v.s. 3.50) ?
>
> 2) How do I determine if it's a posi-traction unit ?
>
> 3) Is there a difference between a posi-traction unit and a locker, or
> is it simply two terms used to describe the same component type ?
>
> Please feel free to provide additional information.
>
> Thanks in advance (TIA)
>
> Cheers,
>
> -D
> ################################################################
>
> Email: darryl....@fmr.com
>
> Disclaimer: The opinions expressed herein are my own and in
> no way reflects the same of my employer.
> All recommendations and advice must be verified
> to be accurate by the recipient before implementation.
>
> #############################################################################
head of the bolts that hold the ring gear to the pinion carrier. If the
bolt heads are in a cast in counterbore (recess) it's a limited slip
differential. No recess for the bolt heads, open diff.
Stay away from lockers on the street. Too much noise and chatter.
Brian Grimshaw
mrfo...@aol.com
Part of the confusion stems from the words used. 'Posi' (short for
'Positraction')
is, I believe, a GM (short for Generous - ahem - Motors) trademark system.
Ford used their own trademarked outfit: 'Traction-Lok'. Both of these
are clutch-type engagements designed for transferring power when slippage
occurs at the wheel.
The true locking member from that period is the 'Detroit Locker', which is
a trademark of the Detroit Automotive Products Company. if you've heard a
'locker' in action you will never mistake it for the others.
MrF
"THE Source for information on your 1964 1/2 - 1973 Mustang"
LBoutw1019
Just getting into AOL but I have some information from my own book of FORD
MUSTANGS that I have written and I have defined the rear end tags from all
years Mustangs. All below are from the l969/70 cars and the rear end
tags that FORD placed on those rear ends at the time of building.
WFA-D Trac. Lock axle ratio 3.25 ring gear 39 tooth pinion 12 teeth
WFA-E Trac. Lock axle ratio 3.00 ring gear 39 tooth pinion 13 teeth
WFB-A Trac. Lock axle ratio 3.25 ring gear 39 tooth pinion 13 teeth
WFB-C Trac. Lock axle ratio 3.25 ring gear 39 tooth pinion 12 teeth
WFC-A Trac. Lock axle ratio 3.50 ring gear 35 tooth pinion 10 teeth
WFC-B Trac. Lock axle ratio 3.91 ring gear 43 tooth pinion 11 teeth
WFC-C Trac. Lock axle ratio 4.30 ring gear 43 tooth pinion 11 teeth
WFC-D Trac. Lock axle ratio 3.91 ring gear 43 tooth pinion 11 teeth
WFC-E Trac. Lock axle ratio 4.30 ring gear 43 tooth pinion 10 teeth
WFC-F Trac. Lock axle ratio 3.91 ring gear 43 tooth pinion 11 teeth
WFC-S Trac. Lock axle ratio 3.50 ring gear 35 tooth pinion 10 teeth
WFC-K Trac. Lock axle ratio 4.30 ring gear 43 tooth pinion 10 teeth
WFC-G Trac. Lock axle ratio 3.00 ring gear 39 tooth pinion 13 teeth
WFD-A Trac. Lock axle ratio 3.50 ring gear 35 tooth pinion 10 teeth
WQFD-B Trac.Lock axle ratio 3.91 ring gear 43 tooth pinion 11 teeth
WFC-C Trac. Lock axle ratio 4.30 ring gear 43 tooth pinion 10 teeth
WFD-H Trac. Lock axle ratio 3.25 ring gear 39 tooth pinion 12 teeth
All the above are Torque sensitive Locker 4 Pinion and All are 9 Inch
types Nodular Iron
Any other information as to any l964 1/2 to l973 Mustang with all High
Performance engine part numbers can be furnished for a self addressed
stamped envelope to:
Lester Boutwell
Boss Hoss Corral
lll8 South 4lst Street
Temple, Texas 76504
817-773-4000
A complete computer printout is available to $7.95 on all part numbers for
the above years Mustangs.