rear end diff

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wmburns

SN Certified Technician
Aug 14, 2009
5,216
398
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Houston Texas
I think you should tell us HOW you intend to use the car. Questions such as:
  • Is this a track car or a street driven daily driver?
  • How much HP are you making?
  • What are your PLANS for the car?
  • What is your budget for the project?
Otherwise this is a purely academic discussion. Why? Because rarely are real world DIY'ers made of $$ with unlimited budgets.
 

stick shift

Member
Aug 28, 2018
19
2
13
72
chino hills ca
same thing, choices
1. posi is a trade name same as limited slip, trac lock etc
2. locked rear end or spool
3. detroit locker
Nothing wrong with the stock 8.8 ford posi unit. Many drag race stangs with slicks use them without a problem.
 

fatal1tywulf

Member
Nov 4, 2018
22
2
13
55
putnam, ct
I think you should tell us HOW you intend to use the car. Questions such as:
  • Is this a track car or a street driven daily driver?
  • How much HP are you making?
  • What are your PLANS for the car?
  • What is your budget for the project?
Otherwise this is a purely academic discussion. Why? Because rarely are real world DIY'ers made of $$ with unlimited budgets.
street driven daily driver/ spirited driving
 

Neuron

Mustang Master
Nov 6, 2016
749
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My experience with the Detroit Locker on the street is not a positive one. Noisy sometimes, accelerated tire wear, kinda weird on turns and slick conditions. I think it is a trade off over an LSD. It is awesome if it fits your needs though.
 

Mustang5L5

Mod Dude
Feb 18, 2001
30,551
7,043
224
Massachusetts
Stick with a limited slip. The full locker style rears tend to be more trouble than it's worth if the car is street driven, especially in the rain.

BTW, posi is a GM trademarked named for their limited slip. Gm is "Positraction", while ford is "Traction-lok". They are both limited slip differentials
 

fatal1tywulf

Member
Nov 4, 2018
22
2
13
55
putnam, ct
thanks for the input. next question is best place to look for an 8.8 trac lok disc brack rear? what cars can I source this? and will anything if anything be useful from the 7.5 in my car?
 

R4ymond

New Member
Dec 28, 2018
14
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quebec city
I`m not sure if the ranger is a traction-lok LSD but they do have a 7.5 LSD that is interchangable(so ive heard) as is the final drive.

https://therangerstation.com/tech_library/axle_codes.shtml

Stick with a limited slip. The full locker style rears tend to be more trouble than it's worth if the car is street driven, especially in the rain.

BTW, posi is a GM trademarked named for their limited slip. Gm is "Positraction", while ford is "Traction-lok". They are both limited slip differentials
As a tech could you confirm?
 

Mustang5L5

Mod Dude
Feb 18, 2001
30,551
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Massachusetts

Neuron

Mustang Master
Nov 6, 2016
749
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The pre 1986 Mustang GT's had it but no rear disc brakes unless it is a '93 Cobra or SVO IRC.
 
Last edited:

GDawg

Founding Member
Mar 22, 2002
1,456
15
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Colorado Springs, CO
Stick with a limited slip. The full locker style rears tend to be more trouble than it's worth if the car is street driven, especially in the rain.

BTW, posi is a GM trademarked named for their limited slip. Gm is "Positraction", while ford is "Traction-lok". They are both limited slip differentials
Good bit of information there. I did not know that.
 

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