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Looking for diff gears 

 

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 Post subject: Looking for diff gears
Posted: Tue Nov 12, 2013 7:40 pm 
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I'm building a cheap drag racing car for a bit of fun

What diff gears are available in the 4.1 - 4.8 range to suit E-series falcon diff. Ideally I want around 4.5. And what is the donor vehicle they are sourced from? I'm in New Zealand so please give full vehicle make and model in case I need to search Ebay Australia as we don't get all the same vehicles you get in Aussie

Thanks in advance for any help

 

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 Post subject: Re: Looking for diff gears
Posted: Tue Nov 12, 2013 8:32 pm 
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xafalcon wrote:
I'm building a cheap drag racing car for a bit of fun

What diff gears are available in the 4.1 - 4.8 range to suit E-series falcon diff. Ideally I want around 4.5. And what is the donor vehicle they are sourced from? I'm in New Zealand so please give full vehicle make and model in case I need to search Ebay Australia as we don't get all the same vehicles you get in Aussie

Thanks in advance for any help


4.11:1 is what you are after. Diff is the same for an E series in NZ as it is in AUS. They were made here.

Example http://www.ebay.com.au/itm/BTR78-4-1-FO ... 2584f0d017
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 Post subject: Re: Looking for diff gears
Posted: Tue Nov 12, 2013 8:57 pm 
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Nissan Pintara.

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 9:55 am 
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Yep....Nissan P31 Pintara rear wheel drive had 4.11 diff gears, in a BW diff.

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 10:37 am 
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Bit of reading here:
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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 3:28 pm 
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Thanks for the excellent replies and links. Nissan Pintara is something we don't get over here

So 4.11's are the lowest gear set available?

Does anyone do a mini spool to suit? Or a full spool? It's a budget track only car, so street drivability doesn't enter the equation.

cheers

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 4:33 pm 
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xafalcon wrote:
Thanks for the excellent replies and links. Nissan Pintara is something we don't get over here

So 4.11's are the lowest gear set available?

Does anyone do a mini spool to suit? Or a full spool? It's a budget track only car, so street drivability doesn't enter the equation.

cheers

Mini spools are available and arent too expensive

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 5:07 pm 
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What did R31 Skyline get?

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 5:24 pm 
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evxr6 wrote:
What did R31 Skyline get?


3.9.

The 6 cylinder stuff got 3.9 and the 4 cylinder stuff was 4.11.

 

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xr6turnip wrote:
More people paid for a ride in a VT commodore then an AU Falcon so the VT is superior.
Based on that fact my Mum is the best around!

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 8:17 pm 
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bry40l wrote:
xafalcon wrote:
Thanks for the excellent replies and links. Nissan Pintara is something we don't get over here

So 4.11's are the lowest gear set available?

Does anyone do a mini spool to suit? Or a full spool? It's a budget track only car, so street drivability doesn't enter the equation.

cheers

Mini spools are available and arent too expensive


Cheers. I see some listed on Ebay but the seller claims they fit EA-EL???? I thought EA-EB1 were a different axel spline count to EB2-EL. 25 v's 28 spline IIRC

When I said budget, I meant the whole car - that's why I'm going to run the original BW diff rather than swapping in a 9". A mini spool is well within the budget.....

 

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 Post subject: Re: Looking for diff gears
Posted: Wed Nov 13, 2013 9:09 pm 
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xafalcon wrote:
I see some listed on Ebay but the seller claims they fit EA-EL???? I thought EA-EB1 were a different axel spline count to EB2-EL. 25 v's 28 spline IIRC
Correct, different centre size too - gearbox-suspension-brake-driveline-f4/ea-eb-diffs-t122907.html

xafalcon wrote:
When I said budget, I meant the whole car - that's why I'm going to run the original BW diff rather than swapping in a 9". A mini spool is well within the budget.....
Hope your original is higher than 3.08:1, otherwise the higher numerical a*** won't fit the carrier.

 

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 Post subject: Re: Looking for diff gears
Posted: Thu Nov 14, 2013 9:48 am 
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Matt_jew wrote:
evxr6 wrote:
What did R31 Skyline get?


3.9.

The 6 cylinder stuff got 3.9 and the 4 cylinder stuff was 4.11.


R31 Skyline's had a few different ratios depending on transmission, equipment level, and if it was a wagon.
I have seen 3.45, 3.72, and 3.89 ratio's fitted.

 

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 Post subject: Re: Looking for diff gears
Posted: Thu Nov 14, 2013 12:44 pm 
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Pretty hard to find 4.11's over here in NZ, I managed to get a set of 3.89's out of a R31 from a guy on Trade Me but haven't fitted them as they looked a bit worn out and was told they would whine a fair bit even if set up properly (apparently they were pretty weak gears and were later replaced with 3.91).

I'm guessing that the R31's and Pintara's used a 25 spline diff? The 3.89's I got are a 75 series gear set (28 spline BW diffs in e-series use the matching 78 series gear set) but can be made to fit correctly into a 78 series diff. Was told by a couple of diff specialists that a spacer/shim needs to be made up for the pinion or something like that when fitting 75 series gears into a 78 series housing.

As for minispool, can't go past Tuff Car Parts for that. http://www.tuffcarparts.com/index.php?r ... uct_id=181

 

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 Post subject: Re: Looking for diff gears
Posted: Thu Nov 14, 2013 4:32 pm 
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xafalcon wrote:
When I said budget, I meant the whole car - that's why I'm going to run the original BW diff rather than swapping in a 9". A mini spool is well within the budget.....
Hope your original is higher than 3.08:1, otherwise the higher numerical a*** won't fit the carrier.[/quote]

Current diff is too good use as a donor. Are you saying that I need to select a 3.23/3.27/3.45 donor or I will have problems?

 

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 Post subject: Re: Looking for diff gears
Posted: Thu Nov 14, 2013 7:34 pm 
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xafalcon wrote:
Current diff is too good use as a donor. Are you saying that I need to select a 3.23/3.27/3.45 donor or I will have problems?


Yep.....to do with the machining/shape of the internal dimentions of the diff housing.

 

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