How hard to determine final drive ratio (Revcon)

[tmsnyder]

I counted mine today, 43 teeth on the ring gear. And stamped very small was 4314 on the edge, 43/14 = 3.07 ratio.

--
Todd Snyder, Buffalo NY
1976 Eleganza II

 

[jim kanomata1]

Go to our web site under final drive and you'll see a chart with the
various ratio identification.

On Tue, Jun 18, 2019 at 8:43 PM Todd Snyder via Gmclist <

> I counted mine today, 43 teeth on the ring gear. And stamped very small
> was 4314 on the edge, 43/14 = 3.07 ratio.
>
>
> --
> Todd Snyder, Buffalo NY
> 1976 Eleganza II
>
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--
Jim Kanomata
Applied/GMC, Newark,CA
jimk
http://www.appliedgmc.com
1-800-752-7502

 

[bill wevers]

I get:
RPM = {[mile/minute * (5280 feet/mile)]/ 7.72 feet/revolution}* 3.07 * 1.05 = 2210 RPM for 3.07
RPM = {[mile/minute * (5280 feet/mile)]/ 7.72 feet/revolution}* 3.55 * 1.05 = 2550 RPM for 3.55
; with 5% torque converter slippage
--
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose

 

[adolph santorine]

Is 5% slippage typical?

Dolph

DE AD0LF

Wheeling, West Virginia

1977 26’ ex-PalmBeach
Howell EFI & EBL, Reaction Arms, Manny Transmission

“The Aluminum and Fiberglass Mistress"

>
> I get:
> RPM = {[mile/minute * (5280 feet/mile)]/ 7.72 feet/revolution}* 3.07 * 1.05 = 2210 RPM for 3.07
> RPM = {[mile/minute * (5280 feet/mile)]/ 7.72 feet/revolution}* 3.55 * 1.05 = 2550 RPM for 3.55
> ; with 5% torque converter slippage
> --
> Bill Wevers GMC49ers, GMC Western States
> 1975 Glenbrook - Manny Powerdrive, OneTon
> 455 F Block, G heads
> San Jose
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org

 

[bill wevers]

I found this info about torque converter slippage:
"Achieving a true 1:1 speed relationship between the turbine
and the impeller is not possible with a non-lockup torque
converter since it is still a fluid coupling. Most street
torque converters tend to operate in the 3 to 5 percent slippage range...."
https://www.hotrod.com/articles/ccrp-0310-torque-converters/

--
Bill Wevers GMC49ers, GMC Western States
1975 Glenbrook - Manny Powerdrive, OneTon
455 F Block, G heads
San Jose