speeds

smilebigtt · Post by **smilebigtt** » March 26th, 2009, 5:37 pm

so for a standard AA setup, what is an expected speed? Of those who drive your AA, what speeds do you get?

smilebigtt · Post by **smilebigtt** » March 28th, 2009, 5:00 pm

This is a standard late 1930 AA with just the 4-speed.

rollingsculpture · Post by **rollingsculpture** » March 28th, 2009, 6:00 pm

do you have the 736 differential; 5:14 gear ratio

smilebigtt · Post by **smilebigtt** » March 28th, 2009, 7:36 pm

I don't know but lets say I do.

Chris Haynes · Post by **Chris Haynes** » March 28th, 2009, 9:39 pm

My AA with high speed gearing was driven on the freeways at 55 MPH for years before I tore it down to rebuild from the ground up.

Neil Wilson · Post by **Neil Wilson** » March 29th, 2009, 6:44 am

The information I have (based on gear ratios and engine rpm) is shown below. This does not account for hills!

2600 engine rpm is about maximum for a stock engine. I would not want to run a stock engine at this rpm very much of the time (2200 to 2400 is a better engine rpm in my opinion).

Bender · Post by **Bender** » March 30th, 2009, 12:36 pm

that looks about right for the 6.60 gear.... i'm running around at between 30 and 35..

jeff

smilebigtt · Post by **smilebigtt** » March 31st, 2009, 12:50 pm

Can I decide the gear ratio by counting the ring and pinion teeth?

Neil Wilson · Post by **Neil Wilson** » March 31st, 2009, 2:03 pm

The gear ratio = ring gear teeth/pinion gear teeth.

TruckMan · Post by **TruckMan** » April 7th, 2009, 5:27 pm

My 1928 AA with a "B" stamped differetial housing does about 38-40 at a steady pace. By the chart that around 2200 rpm. The old truck doesn't seem to have much more than that to give me, unless it's down hill!

Rob MacDonald · Post by **Rob MacDonald** » April 12th, 2009, 8:32 am

How about the early '28 with 3-speed transmission, dual-drive planetary transmission and worm-drive rear? It should go up hills really well, but I wonder how long it will take to GET to those hills....

Neil Wilson · Post by **Neil Wilson** » April 12th, 2009, 12:10 pm

All '28/'28 and '30/'31 AA's with a high speed rear axle gears will run at the same basic speed (with about 1 mph).

40 mph is going to be a good crusing speed for a stock engine (on the flat). The only way to get more speed is to use an overdrive and/or a modified engine which can be driven at higher RPM.

Hardhatz · Post by **Hardhatz** » May 18th, 2009, 7:19 am

Newbie here, my first post: My AA is a 31, in the family since 34. My Granddad bought it from a mining operation up in Lone Pine that produced the insulators for Champion spark plugs.

It has a B motor, and a hydraulic dump that worked fine last time I drove the truck. I drove it quite a bit as a kid. It would do 45 flat out empty. I once took it to the dragstrip and as I recall it ran almost 30 MPH in about 35 seconds.

My 83 years-young dad just turned it over to me at Christmas time. I drove it into the barn in about 1972, and oiled it up pretty well. The body is very solid, and the engine turns over fine. I will turn it into a pickup & modernize it somewhat while maintaining the 1931 looks, and pass it on to my daughter one day. Hope to keep in in the family another 75 years.

smilebigtt · Post by **smilebigtt** » May 18th, 2009, 9:01 am

greeat story Hardh

Rosenkranswa · Post by **Rosenkranswa** » May 18th, 2009, 10:36 am

I have an early '30 with a low-speed rear end, standard 4-speed, and rock-stock engine. She'll do 35 to 40, but doesn't like to. Sweet spot for cruise seems to be about 25. She'll pull stumps in granny gear though.

aa-fords.com

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