Limited Slip, and Gear Ratio?

KG88GT · 12-11-2001, 06:48 PM

I was wondering is there a limited slip available for my GT from another Ford auto model? If there is what is the make and model I should look for? What is the most desirable gear ratio for an automatic tramsmission?
Thanks for any useful info.
KG88GT

Unit 5302 · 12-11-2001, 07:30 PM

I take it you have a 1988 Mustang GT auto. You can use an 8.8" rear end from 1986-1993 LX and GT 5.0 for the Mustangs as bolt in replacements, and the later Mustang GT's as well, although they will be wider. Also the 1987-1988 Ford Thunderbirds, which again, will be wider, Turbo Coupes and I think 5.0s got 8.8" rears from the factory in those years. The Turbo Coupe has rear disc brakes as well. The best ratio for an auto is probably 4.10:1. None of the Mustang's, Tbirds, etc came with 4.10's, but the auto 1987-1988 T-Bird Turbo Coupes did have 3.73's. The standard gear for the Mustangs was 2.73 and the optional 3.27. There is more info I can give, but what are you planning here?

dinomite · 12-11-2001, 07:31 PM

I don't know about other vehicles that have the limited slip diff, but the explorer/ranger shares the rear end, so it just might. For an auto, you want 3.73 or 4.10, depending on how hardcore you wanna be

7DMACH1 · 12-11-2001, 07:55 PM

You can use the guts{ring and pinion and posi unit} out of any 8.8 rear. Just check the tag to see if it's a posi the ratio will have an L in it, example 3L73 is a posi 3.73 is open. I would go with 4.10's. RAY

KG88GT · 12-11-2001, 09:06 PM

Unit5302
I thought that my Mustang had a 8.8 rear end. It doesn't?
As far as what I want to do with this car is to make it perform.
Acceleration, braking, handling the whole nine yards, and make it look good doing it.
Since I am new to Mustangs that is about all I could tell you. I am working as hard as I can to learn my new car.
KG88GT

7DMACH1 · 12-11-2001, 09:12 PM

As far as I know all 88 gt's had 8.8 rears. Up to 85 they had 7.5 and 86 up had 8.8 only 4 and 6 cyls had 7.5. Is it a real gt or something someone tried to make one. The only other thing is if someone changed the entire rear and put a 7.5 in there. What is the tag number on the rear? RAY

gtsr515 · 12-11-2001, 10:01 PM

Unit 5302.....sounds like the Turbo coupe had the highest ratio 8.8 offered.

or was it a 4.10 in a lightening?

just wondereing?

7DMACH1 · 12-11-2001, 10:36 PM

Yes 4.10's came in Lightnings and other for trucks.

tireburner163 · 12-11-2001, 11:35 PM

If it's a 88 GT it has a 8.8 rear-end unless someone blew the orininal rear-end and put in a 7.5. If it's a 7.5 it won't last long.

KG88GT · 12-12-2001, 01:09 AM

It is a real GT. It was my father in laws car. I got it for a song and I know how it was maintained, now it is my turn to make it better.
So I do have a 8.8, so which cars or trucks do I start snooping around for, for limited slip 3.7 or 4.1
KG88GT

Unit 5302 · 12-12-2001, 09:05 PM

I thought you were talking bolt in rear ends, sorry. As long as the differential you choose is an 8.8", with 28 spline axles, it should go into your car.

All 1986+ V-8 Mustang's have the 8.8" from the factory. LX 5.0 and GT 5.0 from 1986-1993 are direct bolt in 8.8" rear ends. That's all I was saying.

Stang Runner · 12-12-2001, 09:14 PM

there was a 3.08 in the stang too was there not???

7DMACH1 · 12-12-2001, 09:21 PM

Yes, my 86 Capri 5.0 5spd came std with 2.73 and a no charge option for 3.08. RAY

12-11-2001, 06:48 PM	#1
KG88GT Registered Member Join Date: Sep 2001 Location: Pueblo, CO, USA Posts: 43	Limited Slip, and Gear Ratio? I was wondering is there a limited slip available for my GT from another Ford auto model? If there is what is the make and model I should look for? What is the most desirable gear ratio for an automatic tramsmission? Thanks for any useful info. KG88GT

12-11-2001, 07:55 PM	#4
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	You can use the guts{ring and pinion and posi unit} out of any 8.8 rear. Just check the tag to see if it's a posi the ratio will have an L in it, example 3L73 is a posi 3.73 is open. I would go with 4.10's. RAY __________________ Your Way Network VIDEOS www.yourwayvideo.com

12-11-2001, 09:12 PM	#6
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	As far as I know all 88 gt's had 8.8 rears. Up to 85 they had 7.5 and 86 up had 8.8 only 4 and 6 cyls had 7.5. Is it a real gt or something someone tried to make one. The only other thing is if someone changed the entire rear and put a 7.5 in there. What is the tag number on the rear? RAY __________________ Your Way Network VIDEOS www.yourwayvideo.com

12-11-2001, 10:01 PM	#7
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Unit 5302.....sounds like the Turbo coupe had the highest ratio 8.8 offered. or was it a 4.10 in a lightening? just wondereing? __________________ Remember...2nd place is 1st place for losers!

12-11-2001, 10:36 PM	#8
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	Yes 4.10's came in Lightnings and other for trucks. __________________ Your Way Network VIDEOS www.yourwayvideo.com

12-11-2001, 07:30 PM	#2
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	I take it you have a 1988 Mustang GT auto. You can use an 8.8" rear end from 1986-1993 LX and GT 5.0 for the Mustangs as bolt in replacements, and the later Mustang GT's as well, although they will be wider. Also the 1987-1988 Ford Thunderbirds, which again, will be wider, Turbo Coupes and I think 5.0s got 8.8" rears from the factory in those years. The Turbo Coupe has rear disc brakes as well. The best ratio for an auto is probably 4.10:1. None of the Mustang's, Tbirds, etc came with 4.10's, but the auto 1987-1988 T-Bird Turbo Coupes did have 3.73's. The standard gear for the Mustangs was 2.73 and the optional 3.27. There is more info I can give, but what are you planning here?

12-11-2001, 07:31 PM	#3
dinomite The Dude Join Date: Feb 2001 Location: Arlington, VA Posts: 1,262	I don't know about other vehicles that have the limited slip diff, but the explorer/ranger shares the rear end, so it just might. For an auto, you want 3.73 or 4.10, depending on how hardcore you wanna be

12-11-2001, 09:06 PM	#5
KG88GT Registered Member Join Date: Sep 2001 Location: Pueblo, CO, USA Posts: 43	Unit5302 I thought that my Mustang had a 8.8 rear end. It doesn't? As far as what I want to do with this car is to make it perform. Acceleration, braking, handling the whole nine yards, and make it look good doing it. Since I am new to Mustangs that is about all I could tell you. I am working as hard as I can to learn my new car. KG88GT

12-11-2001, 11:35 PM	#9
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	If it's a 88 GT it has a 8.8 rear-end unless someone blew the orininal rear-end and put in a 7.5. If it's a 7.5 it won't last long. __________________ 1987 Buick T-type 1998 HD Electra Elide

12-12-2001, 01:09 AM	#10
KG88GT Registered Member Join Date: Sep 2001 Location: Pueblo, CO, USA Posts: 43	It is a real GT. It was my father in laws car. I got it for a song and I know how it was maintained, now it is my turn to make it better. So I do have a 8.8, so which cars or trucks do I start snooping around for, for limited slip 3.7 or 4.1 KG88GT

12-12-2001, 09:05 PM	#11
Unit 5302 Registered Member Join Date: May 1999 Posts: 5,246	I thought you were talking bolt in rear ends, sorry. As long as the differential you choose is an 8.8", with 28 spline axles, it should go into your car. All 1986+ V-8 Mustang's have the 8.8" from the factory. LX 5.0 and GT 5.0 from 1986-1993 are direct bolt in 8.8" rear ends. That's all I was saying.

12-12-2001, 09:14 PM	#12
Stang Runner Registered Member Join Date: Jun 1999 Location: Walker, MI, USA Posts: 1,202	there was a 3.08 in the stang too was there not??? __________________ Engine: steel mounts, Under drive pulleys, K&N, GT-40 Intake ported Lower, No power steering, No A/C, Mac cold intake, 65MM TB, 255 Fuel pump, 24's, AFR 165 58cc, Rocker Arms 1.7with the stock Cam, 1 5/8 short headers, offRoad X-pipe Drive Train: 3.55, T-5 with a Pro 5.0 shifter 12.656@107.71MPH See It at www.T-racing.com/mustang.htm

12-12-2001, 09:21 PM	#13
7DMACH1 Registered Member Join Date: Nov 2001 Location: PHILA. PA USA Posts: 469	Yes, my 86 Capri 5.0 5spd came std with 2.73 and a no charge option for 3.08. RAY __________________ Your Way Network VIDEOS www.yourwayvideo.com

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