rear end diff

Nov 4, 2018
22
2
13
55
putnam, ct
#1
i am wondering if better to have limited slip diff or full posi ? what do you all think
 
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wmburns

SN Certified Technician
Aug 14, 2009
5,073
374
164
Houston Texas
#2
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.
 
Aug 28, 2018
19
2
13
71
chino hills ca
#3
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.
 
Nov 4, 2018
22
2
13
55
putnam, ct
#4
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
743
145
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#5
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.
 
Feb 18, 2001
30,084
6,552
224
Massachusetts
#6
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
 
Nov 4, 2018
22
2
13
55
putnam, ct
#7
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
1
3
22
quebec city
#8
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?
 

Neuron

Mustang Master
Nov 6, 2016
743
145
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69
#9
What is it we are talking about, year, model etc etc?
 
Feb 18, 2001
30,084
6,552
224
Massachusetts
#10
Feb 18, 2001
30,084
6,552
224
Massachusetts
#11

Neuron

Mustang Master
Nov 6, 2016
743
145
83
69
#12
The pre 1986 Mustang GT's had it but no rear disc brakes unless it is a '93 Cobra or SVO IRC.
 
Last edited:
Feb 18, 2001
30,084
6,552
224
Massachusetts
#13
The pre 1986 Mustang GT's had it but no disc brakes unless it is a '93 Cobra.
Correct.

But 86-98 mustang housings are all the same and the 94-98 V8 brakes and axle shafts bolt right in giving you essentially a 94-98 8.8 axle
 

GDawg

Founding Member
Mar 22, 2002
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Colorado Springs, CO
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#17
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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