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CC Advertisers
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01-10-2010, 02:21 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 21
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Not Ranked
Diff Ratio
 Hi everyone,
All the best for the new year.
I would just like some feedback as to what diff ratio I should run behind an
L76 Chev hooked up to a Tremec 6300 6spd. I have been told by a couple of experts to look at a 3.54 or 3.46, I think I have those numberes rite.
Can not give you the gear ratios for the Tuet 6300 box as I could not find it on their website. So if any of you have this I would appreciate your advice.
Cheers
Daz |
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01-10-2010, 06:23 AM
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CC Member
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Join Date: Nov 2000
Location: Tucson,
Az
Cobra Make, Engine: Superformance 427 Side-Oiler
Posts: 2,156
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Not Ranked
Time to break out your calculator.You want "cruising rpm"above the point where your timing advance is fully in.Just off the top of my head without runing numbers,that 3.46 gear is going to be way too low(numerically).
Knowing the gear ratios of the box would make it easier.
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01-10-2010, 02:21 PM
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CC Member
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Join Date: Nov 2009
Location: Cheltenham,
Vic
Cobra Make, Engine: Classic Revival CR3516, LS3, Aussie Mike'd T-56, 3.70 LSD, AP brakes, Penske shocks
Posts: 1,616
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Not Ranked
Commodores with T56 use 3.46, some people have changed to 3.73 or 3.9, but that just results in you going nowhere, visibility gets pretty bad too  |
01-10-2010, 03:08 PM
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CC Member
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Join Date: May 2004
Location: Melbourne,
Vic
Cobra Make, Engine: Cobra RMC 377ci Windsor, Harrison Daytona Coupe, Ford XC Coupe.
Posts: 1,588
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Not Ranked
Diff
DAZ,
I have a L76 with a 6 speed tremec, it originally had a 3.9 and i was changing gears every 3 seconds....
Changed to a 3.54 and it changed the car (for the better)
STIFFY
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01-10-2010, 03:11 PM
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CC Member
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Join Date: Nov 2004
Location: Sydney,
NSW
Cobra Make, Engine: Classic Revival #3199. 366ci L76, T56 6 speed, Blue circle custom paint, Australias most original cobra 2009-2010
Posts: 2,396
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Not Ranked
Same setup with a 3.45 in mine feels perfect. 110 on the freeway is about 1400-1500 rpm I think.
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01-10-2010, 05:06 PM
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CC Member
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Join Date: Mar 2007
Posts: 272
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Not Ranked
You want to be able to use all your gears and have a reasonable cruise rpm. without knowing your gearbox ratios and rear tyre size your a bit stuck. They shouldn't be that hard to find out.
Plenty of online ratio calculators or drop me a pm and I can send you my xl sheet. Tried to attach it but fails.
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01-10-2010, 07:25 PM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
It is completely dependant on what it is that you want to do.
If you are after a cruiser and not a track car 3.5's would be the way to go.
If getting off the line in a hurry is your thing 3.9's are great.
I have 3.9's and would not consider the 2000rpm mine does @ 100k's too high and I run an auto with a higher overdrive ratio than the T56
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01-10-2010, 07:32 PM
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CC Member
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Join Date: Apr 2006
Location: Mildura,
vic
Cobra Make, Engine: FFR Coupe, 416ci of LS goodness
Posts: 2,349
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Not Ranked
The 3200rpm it does at 100 since I smashed the overdrive is wearing me down however....
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01-11-2010, 02:17 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 21
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Not Ranked
Hi Cobrabill,
Thanks for your reply I need to get hold of specs on box, before I do anything.
Cheers
Daz
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01-11-2010, 02:27 AM
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CC Member
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Join Date: Jul 2009
Cobra Make, Engine:
Posts: 21
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Not Ranked
Thank's
Mondena,Stiffy,Tenrocca,Cobber & Gav as I said in my post I was told 3.45 would be the go so thats the way I will head. Just cant find the specs on my box to back it up. Once I work how to send a pm I will send you my details Cobber.
Thank's again guys.
Daz
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