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#4077196 - 09/10/20 07:07 AM 94 Merc GM open to trak-loc Q's
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
G'day y'all!
1994 Mercury Grand Marquis...bone stock 118K mile car...3.08 open rear diff....only upgrade at this point is dual exhaust with H pipe...so she needs some love!
I've done some GM 8.5 open to limited slip conversions, and worked on a mopar 742 open to spool conversion, also a 9" open to spool set up. But this will be the first time working on the 8.8 in my 94 Mercury Grand Marquis. Now I haven't even looked into verifying if it has 28 or 30/31 spline axles, so here are some questions:
1) is my 94 Merc rear end definitely 28 spline?
2) I'm content with simple purchasing a used trak-loc and double checking the condition of the clutches, bearings, etc... so is there anything else I'll need to do the swap such as shims, pins, c-clips, etc....???
3) I'm going to leave the 3.08 gear choice for now to keep it simple...maybe later find a better gear when I gather more information on what needs to be done to the "tune" to get it to shift correctly. Will I need a limited slip additive for the trak-loc?
I'd really like to see the classifides....so I'm also posting to get the 20 count like mandated before that can happen.
Thanks ahead of time for your wisdom!
Ron M.

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#4077212 - 09/10/20 11:27 AM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
TinyTim Online   content
Member

Registered: 07/13/13
Posts: 190
Loc: Ohio
I'd definitely get new clutches for a used trac-lok.They're real cheap and easy to rebuild.Actually,I ended up having the shop reassemble mine while they were swapping gears.I disassembled it myself.But from the instructions and vids I watched on it,it SHOULD be easy

As for the additive,I'd personally use the Motorcraft additive.I didn't because the Mobil 1 synthetic gear oil I used said "limited slip",but it's locked up like a spool on turns at intersections.Even caused me to crash into a parked car when I spun out turning onto a wet intersection
_________________________
2003 Interceptor with dual spotlights,cruise,4.56 trac-lok,J-mod with springs removed/hi-po overdrive spring,quantum 255 pump,hidden dry nitrous setup,[email protected]'s tune,a Rockford Fosgate Punch 15 (guess that makes me a...nerd joke coming up...wait for it...One Punch Man,har-har)

"Boy,everyone is stupid except me."
Homer Jay Simpson

https://supersexystudmuffin.tumblr.com/post/163909691712



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#4077224 - 09/10/20 12:59 PM Re: 94 Merc GM open to trak-loc Q's [Re: TinyTim]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
Thanks tinytim, I'll roll with the standard gear lube and the motorcraft additive. I have a unit in mind that was rebuilt 2500 miles ago. Hopefully the seller is truthful. I'll definitely make sure upon arrival.

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#4077226 - 09/10/20 01:02 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
So, other than pulling the rear end apart to verify, is there any other way to be know if my rear diff has the 28's? Did they all come with the 28's in 94?

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#4077950 - 09/16/20 06:22 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
Bellwestern80 Offline

Tired All The Time
Over the Hill

Registered: 07/01/11
Posts: 3835
Loc: Evans, Georgia
The change over to 31 spline was 2005. Some very early 2005s and all earlier cars are 28 spline axles.

If you're going to have the rear end apart, it's a good idea to check out the axle bearings and inspect for wear on the shafts. It's the one weak point that seems to vary when the bearing wears out. I've seen 8.8s with less than 150K needing seals and the bearings, while my '97 was just starting to let go north of 200K, and it was caught while I was having my 2.73s swapped for 3.55s, so I had everything done in one go. Seems to be the luck of the draw.
_________________________

My Cars:
-1987 Mercury Colony Park LS (330K Miles | H.O. 302) - March 2017 POTM Winner & November 2019 POTM Winner
-1997 Grand Marquis LS (222K Miles | nPI 4.6) - The Daily Workhorse & April 2013 POTM Winner

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#4078044 - 09/17/20 02:49 PM Re: 94 Merc GM open to trak-loc Q's [Re: Bellwestern80]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
Thanks for the info Bellwestern80!


I found a 3.55 trakloc out of a 2003 ranger.......would this be a bolt in deal?

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#4078046 - 09/17/20 03:14 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
Mercury_Man Offline
Stranger

Registered: 03/01/20
Posts: 1
Loc: New Jersey
Originally Posted By gRon_Marqy
Thanks for the info Bellwestern80!


I found a 3.55 trakloc out of a 2003 ranger.......would this be a bolt in deal?


nope

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#4078050 - 09/17/20 03:56 PM Re: 94 Merc GM open to trak-loc Q's [Re: Mercury_Man]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
Well that's not what I was hoping for.......bummer.

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#4078826 - 09/25/20 03:46 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
Would anybody know of a list of rear ends that would be a direct swap for my 94 Merc?
My research says backing plate to backing plate (disc brakes) would be around 63".
I'd love to find out that if SUV or truck with the better gear ratio, say 3.55 or 3.73 would be a good candidate with minimal adaptation.
I can't find any P71 units around my area, all the derby guys seemed to have gotten ahold of them.
Any help would be appreciated.

Thank you!

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#4078848 - 09/25/20 06:33 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
Old_Guy_Stu Offline

Over the Hill

Registered: 04/28/19
Posts: 1480
Loc: Cleveland, OH
You're limited to Panthers up to '02 for a bolt-in deal. Ford trucks all used leaf springs.
_________________________

1988 CVLX Formal Roof (Love Boat) POTM July 2019 & Aug 2020, 54K
E-code lights w/ relays, LEDs w/ switchbacks, 15x8 Ansen slots w/ 255/60 BFG's, Kenwood stereo, various hacks.
1988 CVLX (Destroyer) 1998-2001 driven to death 202K
1988 Squire (Chris Craft) 1996-1998 junkyard rescue driven to death 199K

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#4081014 - 10/17/20 01:56 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
gRon_Marqy Offline
n00b

Registered: 05/09/20
Posts: 26
Loc: n.e. Ill
Update:
I picked up a 1998 Explorer rear end Thursday night, 3.73 track-lok.
I think it's a good score for $120........and I got the four 15x7" wheels which I can paint black to go on the Merc!
I already have some 25570R15's picked out for them!
I'm under the impression it has 31 spline axles on the Explorer diff.
So now I need 31 spline crown vic, marquis, or town car axles from 2005 and up..............correct?
Hopefully, upon inspection, the carrier bearings will be usable. If the pinion bearing looks good, is it OK to reuse?
I've read that I should always replace the axle bearings if over 150K, so I'll do that.
So now I'll be on the hunt for 2005 up 31 spline axles.
I see some rear differential rebuild kits on Ebay with Timken bearings. So I'll be purchasing one of those depending on the condition of all of the bearings.
Am I missing anything here?
Next, I'll be on the hunt for the tools do set the pinion depth and crush sleeve.
Thanks to all who have passed along information and knowledge, it's very much appreciated.

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#4081276 - 10/19/20 12:52 PM Re: 94 Merc GM open to trak-loc Q's [Re: gRon_Marqy]
BigMerc96 Offline

I know nothing
Posting Addict

Registered: 06/05/10
Posts: 19860
Loc: I can see Detroit from here!
You unfortunately cannot use the '05+ axles in a '92-'02 rear end. They are too long. When Ford changed the wheel offset in '03, they widened the rear axle to match the offset of the new front suspension. If the car was a '03-'04 then you could use the '05+ axles. They did make factory 31-spline axles for a '92-'97, but they're rare, only used in Limo package Town Cars. There are also aftermarket companies that'll make you custom 31-spline axles to your dimensions, luckily the Ford 8.8 is a common swap for other vehicles so there are definitely some options for getting axles made.
_________________________
-Steve

2006 Audi A6 ~132k miles, stock.
1998 Mercury Grand Marquis LS HPP ~100k miles, slowly acquiring modifications.
1997 Town Car Cartier ~145k miles, Ported Plenum, Gutted Airbox, Contour E-fan Retrofit, Dual exhaust with Magnaflows, cats deleted, MSD Ignition, KYB Gas-A-Justs, P71 front bar, air ride reinstated, Projector retrofit, Caddy 4-note horn retrofit, Wood rim steering wheel retrofit, holistic weight reduction as the parts fall off..
1996 Mercury Grand Marquis GS 117,485mi. R.I.P. 7/14/12 frown

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