Gear ratio question

[Popeye31]

Im ready to start puting my 30 CCPup back together and whent to grab a trans to clean and put in it well it turns out the one I picked 2 years ago to put in the truck is a 28 with the brake in the middle I was going to just swap the shifter and than thought is there a difference in the gear ratio in the 28 -31 I have 4 transmitions to choose from but I will have to do some gear swaping cause 2 need second gear and the others im not sure about yet.I plan to drive it alot and want the best gear ratio i can get out of the A trans.

[Patrick L.]

I guess I'm not sure what your question is.. I thought all the 3 speed transmitter gears/gear ratios were the same and I thought the parts were interchangeable.. If you're asking about the rear gear,, I believe 3.78 was standard even in the pick-up and 4.11 was available.. So I would guess that the rear gear depends on the vehicle weight, engine condition and modifications, and your local terrain.. The 3.54 gear set is quite popular today..

[2manycars]

All model A transmissions are geared the same.
The rear end gears may vary, but most are 3.78:1

[Popeye31]

Thats what I wanted to know so I can change the shifter and get on with the build thanks guys.

[Bob C]

Also the gear shift lever for the round speedometer has a different angle
than the oval speedometer.

Bob

[Popeye31]

That explains the angle on the shifter I am putting on the trans it has quite a bit more of an angle then the 28 with the brake in front of the shifter.

[Ron in Quincy]

There are difference in transmissions Cases. In 28's the cluster gear has bronze bushings at each end as there is no boss at each end of the case, also the reverse idler shaft has a cup to the inside to pick up oil to luberciate the reverse idler gear as the gear does not have a hole drilled in the gear like the later gears. There is also a difference in the shafts retaining clip thickness depending on the cut out at the end of the shafts. The earlier cases use a different size oil slinger at each end and the bearing stop is machined in the case. The later cases use a snap for the bearings stop. The early cluster gear is machined on the inside so no removable spacer is required, the later cluster gears use a removable spacer. All transmissions use the same 3 small bearings. I believe the gear ratio is the same in all transmissions.
It has been some time since I have rebuilt transmissions so I my have overlooked other differences.

Ron

[Tom Wesenberg]

Whether or not a car is going to be judge I like to keep everything as correct as possible. The SERVICE BULLETINS and JUDGING STANDARDS are two of the best books there are for all this information. As Ron mentioned there are small changes internal and external to the tranny cases, and these are found in the 2 books I listed.