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Author Topic:   3 speed saginaw question
Dirt Maniac

Total posts: 153
posted August 03, 2005 08:17 AM  
Does anybody know how to tell what gear ratios are in a saginaw three speed without taking it apart or removing it from the bellhousing?

I tore up my 9" (6.33 gear) last weekend and was thinking about going back with a 3.89 and running in second gear, but I don't know if second in my tranny is 1.68 or 1.50

sc1 racing
Dirt Freak

Total posts: 419
posted August 03, 2005 09:05 AM  
mark the tail shaft,and housing, then mark the front the same. now put it in the gear you want turn the tail shaft 1 full turn line to line, and count how many times the input turns. more than likely a 1.68,or a 1.84.. but it will be 1 full turn then a partial turn 1/4 of a turn=.25 and so on..just like a pie chart..

you can also go by the input shaft if you are brave enough count the lines and look at the chart, but i would strongly suggest that you spin check it. the input shafts are interchangable..

Dirt Full Roller

Total posts: 38
posted August 03, 2005 11:03 AM  
I agree with sc1, usually you can tell by the grooves on the input shaft (if it ain't been changed).
no groove = 1.68
one groove = 1.50
two grooves = 1.84
three grooves = 1.89
The spin test will tell you for sure. I would add to turn the input 10 times in second gear. Count the revs of the output (or driveshaft). With 10 revs of the input (car in gear) you will end up with 16 (almost 17 turns) if its a 1.68, 15 turns if its a 1.50, and so on. Hard to tell this way if you have a 1.84 or 1.89, but it will get you in the ball park.
Check out and look at their tech help stuff. I have purchased 2 trannys from them, 1 saginaw 1.84 and 1 muncie cast iron 3 speed 1.75. The sag was in a street stock, the muncie in my Supertruck. Both worked flawlessly, absolutely no problems at all (I can abuse parts mercilessly!!!).

Dirt Maniac

Total posts: 153
posted August 04, 2005 03:07 PM  


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