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Grabber70Mach

Rear suspension

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So trying to figure out what is the best way to go in my situation.  Getting back to working on my 70 Mach 1, lots has been planned and many parts already purchased.  I'm looking at doing a minitub on it and am swaying towards the MTF tubs.  Looked at the DS tubs and Dynacorn tubs but don't really want to deal with interior mods.  

I already have the SorT coilover kit for the front and rear.  Years ago I purchased the Vintage Venom Cobra brake kit and installed it.  That's where I'm hoping to get some advice from someone that may know or can give me better advice then my thinking.

 

In the rear the Vintage Venom kit uses a bracket for the caliper and a hubcentric spacer that moves the wheel out approximately 7/16".  The MTF mimitubs give around 2" more of width in the wheelwell, if I understand correctly. (Has anyone done these on a 69-70 that would share some pictures? If so there appears to be a section towards the front that the tub doesn't sit flush with the rail.  What is the measurement from the rail to the inner edge of the tub in that area?).  So the SorT rear kit I purchased you weld the brackets on your rear housing.  Figured since I have the rear out I'm thinking about narrowing it to get my 7/16" back on each side.  Well you know what happens when car guys start thinking.  Now I'm debating if I should just go down to the width of a 65-66 rear.

 

65-66  57.25"

           58.375" If I remove 7/16" per side for a total of ⅞".              

69-70  59.25"

 

I assume this rear measurement is housing flange to housing flange.  Is that correct?

 

In the attached pictures it shows currently how the car sits.  The rear tires are:

 

Rims: 17x10.5 

Back Spacing: 6.8" (174mm) 

Offset: +28mm (1.10")

Tires 315/35/17's

 

I'm staying with this size tire at minimum, but will explore going wider if I can.  I've also thought about calling Quick Performance and just getting them to do a new housing for me.  If I go with the 65-66 width, will my axles work as they are?  Can I just have them shortened and resplined if needed? They are  31 spline axles.

Carlisle08Winter09206-1.jpg

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Grabber, I always liked the look of your Mach 1. I've never fit 315/35/17's on my 69, so I lack that fit knowledge.

Yes, I believe the correct way to measure axle housing width is outside flange O.D. 

I'm pretty sure you can shorten the axle at the splines without issue. 

Why do you need a narrower rear housing and wheel house work done? Is the tire rubbing on the wheel opening lip? Any chance you're using wheel spacers you can eliminate? I pounded out the spare tire indentation on the right rear inner wheel house for more clearance on my 69.

I'd think the least expensive option would be to narrow your housing ~1 inch per side and cut the axles. 

 

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Thanks.  Right now I'm running a leaf spring setup, 5- leaf mid-eyes.  I'm installing the SorT coilover 3-link setup.  I am running a 7/16" spacer that has to be used with the Vintage Venom brake setup.  I'd like to get the rear a tad lower and would feel comfortable with a little more wiggle room.  This is why I'm wanting to do the MTF mimitubs and thinking about narrowing the rear.  If that gives me the ability to run a wider tire than that's a bonus.  I've even thought about doing a slight Trans-am flare on the rear if needed.

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33 minutes ago, mustangstofear said:

I constantly get asked how big a tire can I run with our mini tubs and keep the leaf springs. The answer is you won't gain anything,  the leaf springs hinder you from going wider. Using a standard 52 inch 65-66 housing will only give you a deeper dish wheel.

I'm ditching the leaf springs and installing a SorT coilover 3-link that is patiently waiting in the garage.

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Thanks Grabber. Life gets in the way but its time I get back on it. Do you have a link to a pic of the suspension kit you are going to use on a 69? My friend is helping me with mine and he is the brains of the outfit as far as suspension goes lol. He is a racer from way back. He is retired now and builds high end cars frame up. I have sent him links on the kits out there I thought looked good but he didn't like the geometry . He buys a lot of frames and stuff from a company call Art Morrision, man they are nice. They don't have a four link kit for my car but we are going to get their generic kit and adapt it. Thats the plan at least. Have to make those floor pan rails and get them installed first.

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19 hours ago, Grabber70Mach said:

Hello Phil I'm working on a 70 but 69/70 are basically the same suspension wise.

Here's a link to the suspension I'm using:

http://www.streetortrack.com/Street-or-Track-Rear-Bilstein-3-Link-Coilover-System-pr-24572.html

Would love to do this upgrade one day.  Keep us updated once you get it installed and on the road.  

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