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Old 06-27-2012, 05:44 PM   #1
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7.5 Rear End Questions

Trying to help a buddy determine his gear ratio, the tag says 3.45. When we marked it we got 1.5 tire turns to 2 DS turns???

I can hold both tires and spin the DS freely??? Does this mean the clutches are totally gone???

This is an 89 LX 2.3L...
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Old 06-27-2012, 06:16 PM   #2
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That is weird?....so you sayin you can put the car in park and still roll it?...
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Old 06-27-2012, 06:32 PM   #3
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Originally Posted by XXSTEVEO66
That is weird?....so you sayin you can put the car in park and still roll it?...
In neutral, it's a 5spd.
Also it's on jack stands too..
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Old 06-27-2012, 06:48 PM   #4
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Yeah I figured it was on jack stands f-stick!!...lol jk...but somethin aint right that's way to little d/s rotation especially if you're turnin the tire more then 1 rotation...
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Old 06-27-2012, 06:52 PM   #5
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Re: 7.5 Rear End Questions

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Originally Posted by deadsp0t View Post
Trying to help a buddy determine his gear ratio, the tag says 3.45. When we marked it we got 1.5 tire turns to 2 DS turns???

I can hold both tires and spin the DS freely??? Does this mean the clutches are totally gone???

This is an 89 LX 2.3L...
What he probably has is a 7.5" Open Rear End, there are no clutches.
Automatics usually have the 3.73 ratio and manuals usually have the 3.45 ratio.
Tell him to toss it and look for a 7.5 or 8.8 T-Lock.
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Old 06-27-2012, 06:58 PM   #6
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So if it's an 7.5” open rear end (lmao) is that why he can turn the tire 1.5 and only get 2 d/s rotations?..I still don't get that part..
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Old 06-27-2012, 07:08 PM   #7
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Re: 7.5 Rear End Questions

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So if it's an 7.5” open rear end (lmao) is that why he can turn the tire 1.5 and only get 2 d/s rotations?..I still don't get that part..
Because of the warp in the space time continuum.


There is no torque input so the spider gears are not engaged to turn the axles or the rear end is broken internally.
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Old 06-27-2012, 07:17 PM   #8
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Oohhhh the space time continuum of course I forgot to include astrophysics into my equation duh!..sometimes I don't know how I manage to tie my own shoes in the morning!..lol
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Old 06-27-2012, 08:51 PM   #9
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Quote:
Originally Posted by Trojan Horse

What he probably has is a 7.5" Open Rear End, there are no clutches.
Automatics usually have the 3.73 ratio and manuals usually have the 3.45 ratio.
Tell him to toss it and look for a 7.5 or 8.8 T-Lock.
Awesome! Thanks guys! I believe I have him convinced to get a 8.8..
He is going to build the 302 that was orig in my 87 so might as well for all the obvious reasons!
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Old 06-27-2012, 09:15 PM   #10
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Re: 7.5 Rear End Questions

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Awesome! Thanks guys! I believe I have him convinced to get a 8.8..
He is going to build the 302 that was orig in my 87 so might as well for all the obvious reasons!
Yeah, If he's going to a V8 an upgrade is definitely needed.
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Old 06-28-2012, 03:54 PM   #11
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Quick question how many bolts are on the back of a 7.5?
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Old 06-28-2012, 04:06 PM   #12
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10 just like the 8.8”
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Old 06-28-2012, 04:24 PM   #13
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Originally Posted by XXSTEVEO66
10 just like the 8.8”
Shucks thought i had a 8.8 or 9 under mine :/ oh well
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Old 06-28-2012, 04:39 PM   #14
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I dont think a 9” was ever offered in the fox body's...and I think only v8's got the 8.8”...well maybe the svo had an 8.8” but that I have no idea?..I don't know that much about them..
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Old 06-28-2012, 04:59 PM   #15
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Originally Posted by XXSTEVEO66
I dont think a 9” was ever offered in the fox body's...and I think only v8's got the 8.8”...well maybe the svo had an 8.8” but that I have no idea?..I don't know that much about them..
I didn't know they didnt offer a 9" for the fox
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Old 06-28-2012, 08:56 PM   #16
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Re: 7.5 Rear End Questions

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I didn't know they didnt offer a 9" for the fox
The factory never offered a 9", but you can buy custom built ones if your pockets are deep enough.
I have a 9" custom built in my garage, but it's a homemade fabrication.
I decided to not use it for two reasons. One it is considerably heavier than the 8.8 and two, when it was fabricated they didn't center the third member from side to side, so the driveshaft would have to run at a bit of an angle.


Unless you are building an all out drag car the 9" is not really needed and will only add to your unsprung weight, which is a bad thing. The 8.8 can be built to withstand a considerable amount of power and it is lighter so I went that route instead.
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Old 06-28-2012, 09:07 PM   #17
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Quote:
Originally Posted by Trojan Horse

The factory never offered a 9", but you can buy custom built ones if your pockets are deep enough.
I have a 9" custom built in my garage, but it's a homemade fabrication.
I decided to not use it for two reasons. One it is considerably heavier than the 8.8 and two, when it was fabricated they didn't center the third member from side to side, so the driveshaft would have to run at a bit of an angle.

Unless you are building an all out drag car the 9" is not really needed and will only add to your unsprung weight, which is a bad thing. The 8.8 can be built to withstand a considerable amount of power and it is lighter so I went that route instead.
Ok yeah I've been wanting an 8.8" for mine too
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