- Sep 18, 2009
Most of the old transmissions used an ID system that consisted of rings cut onto the input shaft. A little searching will find them all. The idea is that you want a first gear ratio that compliments the rear gear ratio. It differs for racing, street use, or in-between. I prefer a nice deep first gear so I can take off from a stop without riding the clutch. But not so deep that I can start out in second gear. In my 301 equipped wagon I have the Saginaw with the 3:50 first gear right now with 3:23 rear gears. I still sometimes use it for towing but even around town it is pretty fun set up like that. The 3:11 first with 3:23 rears is pretty much ideal on the street. I used that behind the 400. Saginaw ID chart below.
The early T-10 is complicated too. Lots of variations. I can't find a simple chart and all the links I found are dead. The Super T-10 is not too hard to ID as they use the rings like the Saginaw.
- No lines on the input shaft- First 2.84, Second 2.01, Third 1.34, Fourth, 1.00
- 1 Line- First 2.54, Second 1.84, Third 1.44, Fourth, 1.00
- 1 Line- First 2.54, Second 1.84, Third 1.32, Fourth, 1.00 <— Much less common
- 2 Line- First 3.11, Second 2.20, Third 1.47, Fourth, 1.00
- 3 Line- First 3.50, Second 2.46, Third 1.65, Fourth, 1.00
T10 Second Design (Super T10) 4speed
|Number of ID Groves|