Re: [Amc-list] Overdrive gearing.

[Wrambler242@xxxxxxxxxxx]

The only choice I can find for a replacement set of gears for the T5 puts it at .81 overdrive ratio, this would put me knocking on the door of 2500 rpm at 70 with 3:42's leaving nothing leftover for faster cruising.
I may try the 3:73 axle out of a S-10 first. The gearset for the T5 runs $360.00! 
S-10 rear axles in 3:73 gears can be had pretty cheap if I stick with drum brakes for now.
No hurry, I'm not planningon doing anythign fast right now. It runs, it's good enough for now....

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

 -------------- Original message ----------------------
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. 
> 
> --
> Mark Price
> Morgantown, WV
> 1969 AMC Rambler, 4.0L, EFI, T-5
> 
>  -------------- Original message ----------------------
> From: "John Elle" <johnelle@xxxxxxxxx>
> >  
> > Snip
> > cruise at 76 mph @ 2400 rpm.
> > Snip
> > That works out to be 31.6 mph/1000 rpm, a number that I have found to be
> > pretty much about ideal or at least a good compromise. 
> > My Donohue cruises easily any freeway speed with a Mustang T5 and a
> > 3.15:1 rear axle using P205-70R14 tires and 
> > 5th is easily used at slower non freeway speeds. 
> > My two 80 Spirit based cars with a factory 2.53:1 rear axle, the Spirit
> > with P245-60-15's and the AMX with P205-70-14's both will cruise easily
> > at freeway speeds. One with a factory stock smog legal carbureted 258
> > and the other with a not so factory stock smog legal fuel injected 258
> > and automatic transmissions will easily pull the hills with the
> > carbureted one getting just a bit poopy at the upper end due to being
> > under carbureted. 
> > The P245-60-15 combination works out to about 31.5 or so miles per
> > hour/1000 rpm also. 
> > Personally I would not want a rear axle in the 3.5x+ range on any of
> > these cars or the ones I am building. 
> > That has been my experience so far. 
> > John. 
> >  
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