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Toploader overdrive 

 

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 Post subject: Toploader overdrive
Posted: Mon Mar 12, 2007 10:06 pm 
Smokin em up
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Gday,

Im looking for a Toploader for my XB. Iv been doing the maths trying to work out a diff ratio thats going to give ok revs at 110.

I have heard that there were 3 main Toploader configurations
Wide Ratio: 2.78 1st, 1.93 2nd, 1.36 3rd, 1.00 4th, and 2.78 Rev.
Close Ratio: 2.32 1st, 1.69 2nd, 1.29 3rd, 1.00 4th, and 2.32 Rev.
Overdrive Ratio: 3.29 1st, 1.84 2nd, 1.00 3rd, .81 4th, and 3.29 Rev.

Just wondering if theres an easy way to tell the boxes apart without opening them up and counting teeth?

Im thinking of getting an overdrive version if I can and using a 3.7 diff to get about 110 at 2800 on 24" tyres in top.

(Tyre DIA in inches * revs div 1000 * 3) div (gearbox ratio * diff ratio) = MPH

MPH * 1.81 = KPH

Does anyone know where I could get hold of one of these boxes, or would I be better off just getting a normal 1.00 top ratio one and use a lower ratio diff?

Thanks

 

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Posted: Mon Mar 12, 2007 10:20 pm 
Getting Side Ways
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I think you will find the overdrive version you are referring to is actually the SROD gearbox from early Fox mustangs. I have never heard of an overdrive loader from factory.
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Posted: Mon Mar 12, 2007 10:26 pm 
Oompa Loompa
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There is a toploader overdrive box used for truck and some full sized US cars - most of the US performance people recommend you don't use it as the ratios suck

I have a close ratio box in my 4V cammed Clevo. I would not recommend it for street use as it takes too many revs to get it rolling

If you want good performance go with TKO or T3553 and 3.9:1 rear

 

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Posted: Mon Mar 12, 2007 11:04 pm 
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No worries. Thanks for that.

How is the TKO or T3553 for strength, better or worse than the Toploader? and do they bolt up to a toploader bellhousing or will I need a custom?

 

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76XBGS, 383c, custom crow cam, 4V p&p heads, Isky SS Valve+springs, extractors, 2.5"twins, MSD Ignition, Edelbrock intake, Forged bottom end, Barry Grant 750DP, thermo, discs, toploader, Holley fuel pump, SUPERCHARGED!

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Posted: Tue Mar 13, 2007 7:49 am 
Oompa Loompa
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Should be OK - they were recommended by Mal Wood for use behind my Clevo - which probably makes arounf 400hp

Not sure if they bolt up. Give Mal a call on +61 7 4661 3548 or email malwood@bigpond.net.au

 

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68 XR7 Coupe (302W) - 69 Convertible (302W) - 70 XR7 Convertible (428CJ)
70 Eliminator (351C 4V) - 2002 AU XLS Tickford Ute - 2010 FG G6

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Posted: Tue Mar 13, 2007 8:51 am 
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Mac Winter 76XB351GS wrote:
No worries. Thanks for that.

How is the TKO or T3553 for strength, better or worse than the Toploader? and do they bolt up to a toploader bellhousing or will I need a custom?


EBXR8380 uses a TKO.
EBXR8380 has 440kw at the rear treads (around 590hp@ the rear), you won't have a problem with this transmission.

As for bell housing contact Mal Wood, he should be able to advise what fits and what is the best combination for you. http://www.malwoodauto.com.au/

 

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