Re: [Amc-list] Overdrive gearing.

[Wrambler242@xxxxxxxxxxx]

Theres one issue to take into account.
I run a 27" 255/60/15....
Anything I end up with will likely be better than the current  final first gear ratio of 7:40-1!
I use second gear most always right now.
I am researching gears to find out what is actually available, Astroperformance in Florida has a fifth gearset in the high .7 range, also there may be a Ford .74 gearset. One site I found listed it in use in 83-84 5.0 trans. I haven't found an absolute positive answer, but so far it looks like World class and NWC fifth gearsets may interchange. if so I may be able to come up with something that will be better suited than the stock .63 and .81$$$ sets.
  

--
Mark Price
Morgantown, WV
1969 AMC Rambler, 4.0L, EFI, T-5

 -------------- Original message ----------------------
From: farna@xxxxxxx
> Isn't your first gear 2.95:1? Most stock cars are geared so that first plus rear 
> axle is around 6.0, +/- 0.30 or so. A 67 199 American used a 2.6:1 first and 
> 3.08 rear = 5.68. The big 67 cars used the same trans with a 232 -- 2.6:1 first 
> but with a 3.15 rear = 5.75. The 290 (in big cars) had a 2.57 first = 5.72. 
> Closer to 6.0 would be about the lowest you want. The four speed for 67 had a 
> 2.64 first and the optional rear was 3.54 = 6.18 (standard rear was 3.15). Much 
> lower than 6.5 and first is about useless for anything more than getting the 
> vehicle rolling -- pretty much a granny gear. 3.73 + 2.95 = 6.68. that might cut 
> it, but you won't be using first much. Second should be around 2.10:1 (well, 67 
> AMC T-10 is) -- 2.10 + 3.73 = 5.83, which would be a good starting gear. 
> 
> -----------------
> Date: Tue, 22 May 2007 19:57:08 +0000
> From: Wrambler242@xxxxxxxxxxx
> 
> So in light of all the warnings about the .63 OD ratio being too high.
> I have two choices.
> Find a transmission gear set to bring the overdrive into line. Which I prefer.
> Second choice is to install a 3:73 rear axle, which at 70 mph with a 27" tire 
> puts me just barely over the 2,000 rpm point.
> Hmmm, decisions, decisions. 
> 
> --
> Frank Swygert
> Publisher, "American Motors Cars" 
> Magazine (AMC)
> For all AMC enthusiasts
> http://farna.home.att.net/AMC.html
> (free download available!)
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