Anyone know what all would be needed to do an a230 swap to an a833 transmission with a 225 slant six?
What rear gear? Unless you change the rear gear, the Starter gear with the 4spd will set you back 10%, ie slooower. The second gears are close to the same,and the 833 gets you a gear between second and third. To take advantage of the 833 you will want to upgrade your rear gears 10%
The 230 has ratios of 2.95-
1.83.......... 1.00, IIRC
..and the A-833 has.... 2.66-
1.91-1.39-1.00
If you notice; your 230 is a short second/long direct design. The 1-2 spacing is 62%, while the 2-3 spacing is 54.6% This helps the slanty "launch" for two gears, and then Boom-boom,out go the lights! The A833, solves this by putting a gear where the slanty needs it, but at the expense of some giddy-up off the line. To get the giddy-up back, you need more rear gear. But whatever you add to the rear gear adds it at both ends, so your cruise rpm also goes up 10%.
To make this more understandable, convert these numbers to what I call road-gears by multiplying by the rear gear.
Let's say your slanty has 2.76s. Ok. the roadgears with the A230 are
8.14-
5.05........
2.76 and with the 4gear,are
7.34-
5.27-3.84-
2.76 but if you re-gear the back with 2.94s,then
7.82-5.62-4.09-2.94 or with 3.23s, then
8.59-6.17-4.49-3.23
The 7.82 is still about 4% short, while the 8.59 is about 5.5% higher.
Of course the cruise rpm will rise by 6.5% with the 2.94s, and by 17% with the 3.23s.
And if that is still confusing, Let's say you rev up that slanty and get 60 ftlbs at the flywheel.
With your current tranny,, and say 2.76s this will make 60 times 8.14 =
488 ftlbs into the rear axles. Changing just the tranny,this will be 60 times 7.34=
440ft lbs. Notice the
loss of 48ft lbs. You will have to rev it up higher to take off the same, But it will be more sluggish thru the rest of the gear. Second gear will be a tiny bit better than your current second (4.4%). Then you get the splitter gear,hooray!Since you didn't have one before, this is a 100% improvement,or more logically; a 39% improvement over the previous third gear. And finally the same top gear.IDK if that is any clearer or not, but in my head it was,lol.
There is no downside to the 4gear except the loss of performance in and thru first gear.
