Re gearing the "final drive"

[Mikel]

Hello,
I have a '66 with a mild 455 and I am finding myself wanting less gear for the highway.
I have a final drive from a 75 Eldorado, 2.73. I plan on swapping it in when I do the disk brake conversion (I have the rest of the suspension from the Eldorado), but it is only a 15% change from the current 3.20 gearing.

How do people like 2.73s?

Bruce, how do you like your gearing? Is 1st gear too tall at that point even with the switch pitch T/C?

My experience with the switch pitch torque converter has been very mixed. To me it just adds more slippage and after trying it with my current engine, I just disconnected it. The car takes off much better in high stall than it does in low stall. It is very odd. Where I would love to have it work is at highway speeds, where the transmission will not downshift. But at 2000+ RPM the switch pitch RPM change largely goes away.

Thank you.

[bcroe]

Hello,
I have a '66 with a mild 455 and I am finding myself wanting less gear for the highway.
I have a final drive from a 75 Eldorado, 2.73. I plan on swapping it in when I do the disk brake conversion (I have the rest of the suspension from the Eldorado), but it is only a 15% change from the current 3.20 gearing. How do people like 2.73s?

Bruce, how do you like your gearing? Is 1st gear too tall at that point even with the switch pitch T/C?

My experience with the switch pitch torque converter has been very mixed. To me it just adds more slippage and after trying it with my current engine, I just disconnected it. The car takes off much better in high stall than it does in low stall. It is very odd. Where I would love to have it work is at highway speeds, where the transmission will not downshift. But at 2000+ RPM the switch pitch RPM change largely goes away. Thank you.

I am set here with a couple 403s, RWD and FWD with Switch Pitch and 2.4:1 axle. That axle won't
spin slicks or win drag races. But the mild mannered 403 gets a 4100 lb Delta 0-60 in 7.5 sec,
91mph quarter mile as measured on my VC2000. The same car (with carefully calibrated odometer)
has turned in 19 mpg many times in favorable conditions, 70 mph. Don't have precise numbers
yet for the FWD 79 Eldo similarly equipped, still sorting out the (stock) fuel injection. Once again
its not set for the track, but can still break the wheels loose, has turned in 18 mpg on crap 87.

I expect you are using the stock 66 SWP mechanical control, which I consider useless junk. It only
works for you at idle and near full throttle, if it works at all. The SWP converter should be tighter
for you except when high stall is selected. For me that is idle and going through the gears, then
timing out in economy mode. With my axle, I need high stall to get rolling, unlike a 3.21:1. For
the highway, I can just depress the throttle some and get a short burst of high stall performance.
This is all managed by an electronic SWP controller. GMCs use a manual override SWP switch, but
I find that unnecessary in my cars. Bruce Roe

[Mikel]

Hello Bruce,
Where did that 2.4 final drive come from? I thought 2.73 was the highest they ever offered. Or is it with the 56/65 sprockets?

I am extremely pleased with the torque of my 455 and I would gladly trade a chunk of it for lower cruising RPMs.

I have Bruce Roe's controller and it works exactly as supposed, but taking off from a stop in high stall requires a lot less throttle for me.

Thanks.

[Mikel]

Can a 325-4L be beefed for the weight and power of a 1st gen Toronado? Lower 1st gear, OD, locking torque converter... Sounds like a dream.

[bcroe]

Can a 325-4L be beefed for the weight and power of a 1st gen Toronado?
Lower 1st gear, OD, locking torque converter... Sounds like a dream.

The 325 isn't nearly as strong. It also doesn't bolt up, everything is just enough
different to be a problem. The engine would need to be moved more than an inch.
The matching final drives have failures of the gears; I lost 2 before I converted my
325 to a TH425. The final drive flanges are an inch wider, so you'd need to shorten
your half shafts.

Sorry, its a 57:65 power drive chain. The 2.73 is actually 41:15.
(41 /15) X (57/65) = 2.397:1. Bruce

[Mikel]

Thanks Bruce.

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