MK-I MK-II MK-III MK-IV GULF MIRAGE J-CAR LOLA
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Why not start with your first post today and become an active part of GT40s.com now! And, if you find you enjoy GT40s.com think about becoming a Forum Supporter. | | GT40 Tech - Chassis,Brakes,Tires,&Wheels Chassis and Handling. | 
01-22-08, 09:50 AM
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#1 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24  | GTD rear upright conversion
The rear GTD uprights I have, were originally made for drum brakes (see first pic)
I've obtained a rear disc setup from a MK 3 granada and am trying to see about adapting the rear uprights to fit the discs.
After removing the drum assembly, I found a plate with a 70mm hole (approx) welded over the main body of the upright. The main part of the upright has an 82mm hole in it, suitable for the flange on the base of the hub to fit inside. I think I should replace the 5mm steel I removed with a section of plate to re-strengthen the upright and to give the bolts holding the hub in place something to "bite" on. I think however, before I go any further, I should get some "cosworth" hubs, as the "ears" for the calipers, stick out further and mean I won't have to chop away at the fabric of the upright.
All the welding will be done by a competent welder friend of mine who builds chassis and race cars, so if there are any structural issues, he will put me right. I'm just asking if anyone else has converted their hubs and if there's anything else I should take into consideration. Any advice much appreciated.
Simon
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GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | 
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01-22-08, 09:52 AM
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#2 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24 | Re: GTD rear upright conversion
More pics
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GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | |
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01-22-08, 10:03 AM
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#3 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24 | Re: GTD rear upright conversion
HHMMMMM...........it now seems that I may already have the correct (longer) hub carriers. This may entail some reliefs being cut into the upright!
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GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD.
Last edited by simonjrwinter; 01-22-08 at 10:19 AM.
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01-22-08, 11:37 AM
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#4 (permalink)
| | jjs Rookie
Join Date: Jan 2007 Location: Finland
Posts: 61
Rep Power: 2 | Re: GTD rear upright conversion
Cosworth hub "ears" for caliber are only 10 mm longer than Sierra/Scorpio/Granada mk3 ones; is that enough?
You may have noticed that bearing -inside- and outside diameters are not similar between "drumhub" and "dischub"; must use stub and flange (not sure about terms) from Si/Sc/Gr for 100 mm joint or 2wd Cossy for 108 mm joint.
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Escort RS Cosworth -93 Motorsport Edition
Sierra RS Cosworth 2D -86 --> RS500
Sierra RS Cosworth 2D -86 GrA ex-works rallycar | 
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01-22-08, 11:57 AM
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#5 (permalink)
| | Ron Earp Site Administrator
Join Date: Sep 2001
Posts: 3,844
Rep Power: 54  | Re: GTD rear upright conversion
Simon, you've been around here long enough to know this belongs in the suspension section.....   | |
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01-22-08, 11:59 AM
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#6 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24 |  Re: GTD rear upright conversion
Yes, sorry Ron, just wanted it to get to the widest audience for criticism. Please feel free to move it.
Simon
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GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | |
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01-22-08, 04:27 PM
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#7 (permalink)
| | MikeP 2 Tenths
Join Date: Dec 2005 Location: Oldham England GT40: GTD + GTD
Posts: 206
Rep Power: 5 | Re: GTD rear upright conversion
The last time I was at Southern GT Mick Sollis had some fabricated new uprights for a GTD which use the Mk3 granada /scorpio hubs. Check out with Mick as they would be very much lighter than what you have.
Cheers
Mike | |
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01-22-08, 05:21 PM
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#8 (permalink)
| | simonjrwinter serial GT40 owner
Join Date: Jan 2002 Location: Essex, UK GT40: GTD
Posts: 1,768
Rep Power: 24 | Re: GTD rear upright conversion
Thanks mike,
I'l probably stick with the GTD uprights for the time being.
If anyone has any closeups of Disc braked rear uprights I'd be grateful to see how they differ from drums.
Thanks
Simon
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GTD with Southern GT rear end. Lowered engine and gearbox. 302, R21T gearbox with LSD. | |
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01-23-08, 02:40 AM
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#9 (permalink)
| | brettmcc 10 tenths
Join Date: Jan 2003 Location: Essex, UK GT40: RSGTD
Posts: 1,287
Rep Power: 19 | Re: GTD rear upright conversion
Simon,
Come round and see mine. They are off the car at the moment. You can take all the pics you want. I also have Micks's rear uprights.
Brett
PS Working at home today (Wednesday) | |
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