Technical Saginaw 4-Speed Identification

Can anyone help identify a Saginaw 4 sp with 4 grooves on the input shaft?

Thanks.

 

Are you positive it's a Saginaw and not an iron T-10? I've never seen a "4 ring" Sag, but it most likely has a 3.11 or 3.50 1st gear. The word on the street is those are the weakest of the Sag 4spds. Lots of info on how to determine what it came from on Nasty Z/28 info pages.

 

Post a picture from the side showing the side cover (and all three shift levers).

 

Can you give us a pic of the side cover and extension housing near the end? ALL the sources I've looked at don't list any Sags having FOUR rings. 1 ring is 2.54 first, 2 rings is 3.11, 3 rings is 3.50. The gears are slightly narrower on the 3.11 and 3.50 units. As long as you don't BEAT ON them they should be fine. I'm not sure the input shaft on a B/W, being course spline would have any rings, but that's NOT carved in stone. IF it was a FINE spline input shaft, a SUPER T-10, then the rings would make sense. Any others? Butch/56sedandelivery.

 

Here is a picture of the side cover. Everything else seems to match for a Saginaw including a couple casting numbers. Just confused over the grooves on the input shaft. Thanks in advance for the help.

 

It looks like a Saginaw to me.




jerry

 

Any idea what the 4 grooves means? Anyone?

 

on many transmissions you have groves cut into the input shaft. this is to I D what transmission gear set you have. The reason is in mfg and repair you can tell at a glance what you have.. All my limited tech books I have on saginaw only list no line,1 line ,2 line and 3 line for 4 speed and the 3 speed.. Both the 4 speed and the 3 speed have the same matching gear ratios in first gear.. I found a T 10 with 4 groves but that is not what you have..

 

Don't dispair too much over a 3.50 Saginaw. If you plan to drive your car on the freeway, the 3.50 trans allows you to pop a set of high rear gears in and still allows you to comfortably drive your car in city traffic. That's especially good if you have a heavy car.
I ran a 3350 LB chevy sedan delivery with that Vega saginaw [$35 at U-pull-it] and a 2.29 geared early 80s GM 10 bolt rear axle. The car would start off on a steep hill without slipping the clutch [406 sbc] and cruise the freeways at 75-80 mph at 1800-2000 rpms. I use to drive that thing all over the western half of the US...got about 17 mpg at 65-70 mph and it was a blast to drive in Montana with no speed limit.

 

Thanks all.