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rear end

Printed From: The Ford Torino Page
Category: Model Specific Forum
Forum Name: 1977-1979 Ford and Mercury
Forum Description: Technical discussion for 1977-1979 Ford and Mercury
URL: https://forum.grantorinosport.org/forum_posts.asp?TID=21319
Printed Date: 26-March-2026 at 10:33AM
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com


Topic: rear end
Posted By: fordpower
Subject: rear end
Date Posted: 28-June-2024 at 1:43PM
Ok I found a 79 truck rear end. 3.5 code 16a. someone told me trucks are the 3. what ever mine is 28. Can i find out without pulling axle



Replies:
Posted By: 72 RS 351
Date Posted: 28-June-2024 at 3:22PM
I'm guessing you are after a 31 spline diff, axles? Trucks usually had the stronger 31 spline axles and cars came with 28 splines. If you need to buy axles and a diff, anyway, you can convert by choosing the spline count of both.


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Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000 rpm 351 stroker
73 Ranchero GT 351C-4V &4R70W for sale later.
92 Lincoln Mark VII SE GTC, OBDII 347/4R70W


Posted By: fordpower
Date Posted: 29-June-2024 at 2:15AM
Not wanting to go 31 spline. Just found 3.5 locker but it's a truck rear end. I was told trucks are 31 spline. Just want to go to 3.5 for AOD trans I have.


Posted By: 72 RS 351
Date Posted: 29-June-2024 at 3:59AM
Ah, the 3.50:1 gears, you can still buy the gears if you can afford the higher price these days. Don't buy the whole rear end unless the cost is less than what you could buy the part you are after in that. The 31 spline diff would get you the gears, but the differential would only work with 31 spline axles. You might use more of it and get new axles to match the diff.


I got a set of 8.8 gears a few years ago for $135 new(Ford), but now they seem to be about $200. I bought a nearly new set of 3.31 Jeep gears for my Explorer(front diff uses the old Jeep D35 gears), they were $115 +shipping.

Keep an eye out on eBay sometimes, for decent deals that may pop up.


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Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000 rpm 351 stroker
73 Ranchero GT 351C-4V &4R70W for sale later.
92 Lincoln Mark VII SE GTC, OBDII 347/4R70W


Posted By: Rockatansky
Date Posted: 29-June-2024 at 9:31AM
what's code 16A, off the door jamb sticker? 

find the code on the rear end tag and see if it's in this list

https://www.fordification.com/tech/rearends_ford01.htm" rel="nofollow - https://www.fordification.com/tech/rearends_ford01.htm


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72 GT Ute
   


Posted By: fordpower
Date Posted: 29-June-2024 at 12:06PM
no tag its out of a 79 truck door tag said axle 16a owner said 3.50 locker.What does it mean when one wheel turns the other. does not either side. Never saw this


Posted By: aquartlow
Date Posted: 29-June-2024 at 1:02PM
Originally posted by fordpower fordpower wrote:

no tag its out of a 79 truck door tag said axle 16a owner said 3.50 locker.What does it mean when one wheel turns the other. does not either side. Never saw this

Open differential or the Trac-lok clutches are shot....really shot. If you are planning on purchasing, at least inspect the differential/center section with it removed from the housing, those Trac-lok's have a tendency to break at the ring gear mounting bolts when pushed really hard or when large tires are used(more mechanical leverage against the differential). If it's all stock/from factory, just remember, this differential and all parts involved are 45 years old.


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www.supermotors.net/22468
Yeah, It's a Hybrid...It burns gas and tires.

No matter how good she looks, somebody, somewhere, is tired of her sh*t.

Beauty is skin deep, ugliness goes clear to the bone.


Posted By: Rockatansky
Date Posted: 30-June-2024 at 4:51AM
FYI the term 'locker' refers to a Detroit Locker which is very different from a factory Ford Trac-Lok center section. a Detroit unit has metal teeth that engage and disengage to lock the center section under load, the Trac-Lok uses clutches to bind the center section with friction similar to a GM Positraction but it's never 'locked'


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72 GT Ute
   


Posted By: Eliteman76
Date Posted: 17-September-2024 at 5:48PM
The issue with truck 9”, they lack the Daytona pinion support the Torino 9” used.
You really need to use a Torino 9” carrier otherwise if you bottom a car hard enough (which I’ve done a few times at speed) the yoke of the carrier can get hammered by the rear frame cross member and that’s not a good thing.

Other consideration:
Truck 9” usually got subjected to a lot of abuse over the years. Pulling trailers, hauling stuff, and usually poor service intervals as the vehicles aged.

You could use the carrier but the problem goes back to not right.

You can pull the tracklok out of the carrier, but for the money…
Man idk. I’d just as well buy a brand new tracklok and a new gear set.

I used Quik Performance out of Ames, Iowa to rebuild my 9” WAR carrier for my Q code.

No, it wasn’t cheap at a little over $1k in 2021, but I also went with an Eaton trutrack 28 spline locker, 3.70 USA made gear set, and Timken bearing set.
I’m not drag racing so I’m comfortable with stock 28 spline axles for the time being.

I get the budget build aspect…and getting by in a pinch if something breaks. Man do I ever!
But sometimes I’ve had to step back and consider long term needs. Just my 2 cents on the deal!


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Andrew:GTS.ORG admin, '72 Q code 5 speed Restomod
Pondering: #99Problems


Posted By: 72 RS 351
Date Posted: 18-September-2024 at 1:31AM
Ditto, costs have skyrocketed. I miss the days of a $25-$50 9" open chunk, and a junkyard LS 9" for $75.

I noticed the True Trac went up since 2022, they were under $600, now it's $700ish.


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Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000 rpm 351 stroker
73 Ranchero GT 351C-4V &4R70W for sale later.
92 Lincoln Mark VII SE GTC, OBDII 347/4R70W


Posted By: Eliteman76
Date Posted: 19-September-2024 at 5:40PM
I was on my phone the other night when I posted up on this previously.

If you go with a new Ford track-lock, Quick Performance out of Ames have some smoking deals.

The example below is for a Track-lok kit with 3.70 gears. 3.50 gears are the same price.

Now, I went with an Eaton True-trac because I know me and my potential for screwing around with my car. I didn't want to bother with killing clutches after one too many rowdy burnouts. 
https://www.quickperformance.com/Ford-9-Eaton-Truetrac-28-Spline-912A587_p_7997.html" rel="nofollow - https://www.quickperformance.com/Ford-9-Eaton-Truetrac-28-Spline-912A587_p_7997.html

That truetrac unit is $626 by itself, which is why my full 9" carrier rebuild was a bit over $1K.

https://www.quickperformance.com/Ford-9-Trac-Lok-Posi-Ring-Pinion-Gear-Bearing-Kit-Package_p_20362.html" rel="nofollow"> https://www.quickperformance.com/Ford-9-Trac-Lok-Posi-Ring-Pinion-Gear-Bearing-Kit-Package_p_20362.html" rel="nofollow - Ford 9" / Trac-Lok Posi / Ring & Pinion Gear / Bearing Kit / Package
https://www.quickperformance.com/view_cart.asp#" rel="nofollow - View/Hide options
Spline Count: 28
Gear Ratio: 3.70
Pinion Support Bearings: Daytona Inner Bearing (HM89410/HM89443) (+$15.00)
Carrier Bearing O.D.: 3.060" (LM603049/11)
Solid Pinion Spacer: No Thanks
Lube Locker Gasket:  Ford 9" Lube Locker Gasket (+$21.95)
Posi Additive:  Posi Additive (+$10.00)

$561.95$561.95
 Subtotal$561.95
 TOTAL$561.95


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Andrew:GTS.ORG admin, '72 Q code 5 speed Restomod
Pondering: #99Problems


Posted By: fordpower
Date Posted: 22-September-2024 at 12:28AM
was going that direction until I found out to install would be 400 to 450 to rebuild.


Posted By: Eliteman76
Date Posted: 13-November-2024 at 3:06PM
True. Costs ain't quite as cheap these days, but I'd rather pay someone that knows what they are doing. Hence why my build was nearly $1k+ for everything due to the parts used.

But I am able to do this sort of stuff now and not think twice:
(at the 6:00 minute mark)



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Andrew:GTS.ORG admin, '72 Q code 5 speed Restomod
Pondering: #99Problems



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