7.5 Rear

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 21, 2014

#1

• Oct 21, 2014

• #1

Ok guys need some advice;I got the posi for my rear,now need to know what's a good gear set.I'm running a fairly stock 351 windsor and a 5 speed tranny.Currently has 3.45 gears in it. 3.55 or 3.73s which is better ?

 

Boosted92LX

It's only an inch or two. What's the big deal?

15 Year Member

Dec 19, 2010

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Oct 21, 2014

#2

• Oct 21, 2014

• #2

On a 7.5??? Man, I'd seriously consider going to an 8.8. I had a 7.5 in an 84 gt (apparently that's what they came with). It lasted about 5 minutes behind a T5 and a mildly built 302. I wound up going to a swap meet and buying an 8.8, and no more problems... Sorry to be a wet blanket, but there's a reason they went to 8.8's in the V8 cars.

 

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oldskolbus

Founding Member

Apr 30, 2002

258

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29

WV

Oct 21, 2014

#3

• Oct 21, 2014

• #3

Ditto.. I would look for a 8.8 with the gear set you are looking for, and only pay for it once. I don't know what a 7.5 can handle but a 351 puts out a lot more torque than a 302.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,269

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Oct 21, 2014

#4

• Oct 21, 2014

• #4

Going with a taller gear set only increases the force on those teeth. You run a bigger risk of shearing the teeth off with the torque of a 351, and the smaller diameter ring gear on a 7.5".

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 21, 2014

#5

• Oct 21, 2014

• #5

Well I would love to put an8.8 in,however finances are tight right now. So the 7.5 is gonna have to work for now.

 

Boosted92LX

It's only an inch or two. What's the big deal?

15 Year Member

Dec 19, 2010

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Oct 21, 2014

#6

• Oct 21, 2014

• #6

I understand tight finances, been there. But resourcefulness is it's own reward. Look around for junk cars and knock on doors asking to buy parts. This can get them cheaper than junk yards. Even running what you've got until you can afford an 8.8 is a more wise decision than investing in gears for a 7.5

 

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Shakerhood

20+ Year Stangneter

Oct 28, 2004

3,359

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Ohio

Oct 21, 2014

#7

• Oct 21, 2014

• #7

Go 8.8 for sure.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 21, 2014

#8

• Oct 21, 2014

• #8

Plan is put the posi. In now with the gears I have.Then look for an 8.8.

 

Boosted92LX

It's only an inch or two. What's the big deal?

15 Year Member

Dec 19, 2010

5,721

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Oct 21, 2014

#9

• Oct 21, 2014

• #9

Ghostrider59 said:

Plan is put the posi. In now with the gears I have.Then look for an 8.8.

Click to expand...

Good plan. Get a 3:73 gear for n/a street driving in your 8.8 when you finally get it. I liked mine. It pulled well and It got 24-25 mpg before I went turbo.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 21, 2014

#10

• Oct 21, 2014

• #10

Thanks guys,I appreciate all the advice.

 

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stowahstang

Member

Oct 21, 2014

3

1

13

Oct 21, 2014

#11

• Oct 21, 2014

• #11

I've got a 8.8 3.55 track loc from a 88 turbo TBIRD. $100 if your up near north dakota. I just switched to an 8.8 and glad I did.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 22, 2014

#12

• Oct 22, 2014

• #12

Thanks for the offer, unfortunately I live in Pa.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,269

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Oct 22, 2014

#13

• Oct 22, 2014

• #13

Ghostrider59 said:

Well I would love to put an8.8 in,however finances are tight right now. So the 7.5 is gonna have to work for now.

Click to expand...

I understand, but when it blows up and you are forced to then find an 8.8, you are basically paying much more than if you initially invested in the 8.8 to begin with.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 22, 2014

#14

• Oct 22, 2014

• #14

Well posi for the 7.5 was cheap, so I'm not gonna lose much. Started looking local for an 8.8.

 

79dog

Founding Member

Oct 26, 2002

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37

Sunny Fl.

Oct 22, 2014

#15

• Oct 22, 2014

• #15

You don't have any local salvage yards? I just trashed an 85 with an 8.8. No body local wanted it. They told me they were pulling the 8.8 and crushing the car. I didn't care, I wanted it gone.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 23, 2014

#16

• Oct 23, 2014

• #16

Found one on craigslist,8.8 with 3.73 gears.Guy wants 275 for it,is that a good price ?

 

stykthyn

I want to measure mine. It doesn't look that tall.

15 Year Member

Jul 6, 2006

5,232

2,652

223

gainesville

Oct 23, 2014

#17

• Oct 23, 2014

• #17

If the clutch packs are in good shape that's not bad especially if it still has the backing plates for the brakes. I paid 250 for mine abd had to drive an hour away to get it.

 

rd

Founding Member

Jan 12, 2000

3,316

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109

Ocean Springs MS

Oct 23, 2014

#18

• Oct 23, 2014

• #18

My 82 has gone high 12s with the 7.5 in rear. However, this is with a c4, and a loose converter, footbrake launched. 1.8 sixty foots, on Drag Radials. I installed a new Ford Racing traction lock and 410 gears.

That said, I have two 8.8s in waiting their turn....

The 351 should be a big enough step up that an 8.8 is a necessity. Especially with at five speed.

It will be fun while it lasts.....

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 24, 2014

#19

• Oct 24, 2014

• #19

Bought an 8.8 with 3.73 gears.

 

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Ghostrider59

Member

Sep 21, 2014

56

3

8

Berwick,Pa

Oct 25, 2014

#20

• Oct 25, 2014

• #20

Going to pick up rear today,can't wait to put it in.