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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 16, 2017 08:59PM

Clark's Technical.

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Re: My '61 Loadside...
Posted by: SteveInMarietta ()
Date: January 16, 2017 09:28PM

OK, I dug deeper and stand corrected - but only partially.

First is a snippet from the 1963 Truck Engineering Specifications book, showing the row for R10 and giving 3:89 as only axle available. This was true for 61 and 62 also.

Second is a snippet from the 1964 Truck Engineering Features book, stating that in 1964 the 3:55 replaced the 3:89; but indicating that the 3:55 was now the only axle available.
Steve

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 16, 2017 09:28PM

'61 Dealership Brochure.

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Re: My '61 Loadside...
Posted by: SteveInMarietta ()
Date: January 16, 2017 10:02PM

This is a snippet from the 1962 Truck Engineering Features Book stating that the 3:27 was canceled in "mid 61". I don't know exactly when in 61 it was cancelled.. (I'm pretty sure my early 61 4-sp GB has a 3:89).
Steve

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 16, 2017 10:09PM

Cool! Another Early '61 anomoly! smileys with beer

I consider mine Early '61 (11/60) but GM obviously had a reason to dump the ratio.
Too tall ya think!

Good stuff. Now I have confirmation on WTF?

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Re: My '61 Loadside...
Posted by: SteveInMarietta ()
Date: January 16, 2017 10:15PM

Great discussion. I'm going to add this information to the Corvanatics Options web page.
Steve

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Re: My '61 Loadside...
Posted by: cnicol ()
Date: January 17, 2017 06:59AM

All three ratios were offered in FCs at various times.

Most 61-3 manual trans FC were 3.89

Early '61 FC 4-Sp transmissions had a special low-low first gear which allowed them to be used in combination with a 3.27 final drive. This was the standard combo on 4-sp Greenbriers and an optional combo on Pickup and Van. If the pickup or van buyer didn't go for the option, they got a 3.89 with their low-low 4-sp.

Mid '61, the low-low first gear FC 4-sp was discontinued along with FC availability of the 3.27 axle ratio. From mid '61 FC 4-speeds use the same "medium low" first gear found on Corvair passenger cars.

For the '64 model year, all FC had 3.55 ratio axle combined with the "medium low" first gear ratio from earlier models while passenger models were blessed with more of a "close-ratio" 4-speed trans.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: My '61 Loadside...
Posted by: SteveInMarietta ()
Date: January 17, 2017 07:07AM

Craig,

Early '61 FC 4-Sp transmissions had a special low-low first gear which allowed them to be used in combination with a 3.27 final drive. This was the standard combo on 4-sp Greenbriers and an optional combo on Pickup and Van. If the pickup or van buyer didn't go for the option, they got a 3.89 with their low-low 4-sp.

I have not seen evidence for a rear axle option, other than the positraction. Wouldn't this have required an RPO?
Steve

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 17, 2017 09:06AM

Looking through my '62 FC dealership brochure,one can see that the 3:27 distinction no longer exists on the optional 4-spd.

Just thought to share the difference. No point,really. Listening and learning.

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Re: My '61 Loadside...
Posted by: cnicol ()
Date: January 17, 2017 09:49AM

Here's my data (from '61 service manual)

I wonder if this option was planned and not done or maybe it was a CPO not an RPO?

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: My '61 Loadside...
Posted by: SteveInMarietta ()
Date: January 17, 2017 11:37AM

It would be very interesting to know when the 3:27 option was canceled. The Shop Manual was printed in 1960, and probably compiled before production began.
Steve

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Re: My '61 Loadside...
Posted by: Vern in Bend ()
Date: January 17, 2017 12:25PM

The combination of a 4.27 first gear and a 3.89 diff must be a real stump-puller, one would perhaps not need first to get started.

I'll bet the 3.27 rear was an attempt to maximize gas mileage (new 'economy' vehicle, you know) and the 4.27 first gear was needed to get the thing moving.

Regards, Vern

Bend, Oregon

'64 Corvan, daily driver - 43 years
'64 Rampside, personal driver - 25 years
'67 Monza Cpe, original owner - 33k miles
'81 Vanagon high-top panel van

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Re: My '61 Loadside...
Posted by: cnicol ()
Date: January 17, 2017 01:26PM

Vern, I think the 3.27 in the GB was to tailor it for highway use as a passenger car. The 3.89 ratio is pretty busy at 65 MPH.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 17, 2017 01:51PM

Beginning to sound like a 3:55 is in my future.
After all,Loadsides are pretty useless for heavy loading without the ramp and the ability to travel lightly at highway speeds under 4,400rpm would be nice.

I'll report back when Paul finds out what the gear stack is.



Edited 1 time(s). Last edit at 01/17/2017 01:53PM by Pedigo.

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Re: My '61 Loadside...
Posted by: corventure Dave ()
Date: January 17, 2017 03:02PM

The 3.55 will give you the best performance with the little engine and FC 4 speed. You also may deal with more hills and scenic mountain roads where you are.

Flatlanders could go to a higher 3.27 ratio. Heavy loads and steep hills, go with the lower 3.89 ratio.
I knew a guy who pulled a full size enclosed car trailer and had special 4.11's in his Diff. 55mph was the normal for him!

Then there are the 3.08's!eye popping smiley


My Greenbrier with Powerglide, 3.89 and 95hp late Fc engine goes great in most all conditions. But like Craig said. When I'm on the open freeway... at least 3.55 would be a bit better. But we're both happy cruising in the "brick" on the freeways at about 62mph with the combination I have. Don't get on the open freeways much anymore anyway.

Corventure Dave

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 18, 2017 04:15PM

NOS '61-'63 mystery shifter condom for future use.

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 23, 2017 12:36PM

Trading labor for Loadside shop time...drinking smiley
Love's me some undercoating removal.thumbs down
(I gotta get me one of these rotisseries some day,though)

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Re: My '61 Loadside...
Posted by: corventure Dave ()
Date: January 23, 2017 01:08PM

BB-Q's and rotisseries go well together! It all depends on how you cook it!

grinning smiley

Corbventure Dave

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: January 23, 2017 04:57PM

4spd/FC trans carrier arrived. Thanks,Jerrythumbs up

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Re: My '61 Loadside...
Posted by: Pedigo ()
Date: February 02, 2017 03:54PM

"Currently" wrestling with a new electrical gremlin.
"Fan/Gen" light mysterious appeared out of nowhere the other day.
All new Battery,VR,Generator...everything.
Put the multimeter on the battery. 12.6v all stop and 14.85v running.

I'll be damned if I know...

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Current Page: 31 of 32


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