4 spd. trans I.D. help needed...please

Here is what I know.....Chevy four speed came out of a 57 chevy, but is newer than that.

Side cover 6261886
Tail A2A
Casting Date? 11-26-73
Cast Iron?'

Anyone? Squirrel?

http://i15.ebayimg.com/04/i/000/81/d7/ec5b_1.JPG
http://i10.ebayimg.com/01/i/000/81/d8/105c_1.JPG
http://i8.ebayimg.com/03/i/000/81/d7/f448_1.JPG

 

Trying to post you a link, (may be borg warner by the date looking number) it go?

Side cover 6261886
Tail A2A
Casting Date? 11-26-73
Cast Iron?'

Anyone? Squirrel?[/quote]

 

Thanks, the tail shaft in your picture seems a little longer and different shape. The case looks like it could be similar.

[/quote]

 

I added some pictures....that should help you guys out.

thanks again.

Phil

 

yep, t-10 for sure, my back hurts just looking at the photos, back when I was 14 my neighbor said If I helped paint and "fix up" his 57 belair He would take me to school, (hated the bus,, too slow) I bit, we painted, honed bk cyls, etc all summer, then came the first day of school, man those peanut 3 speeds dont do well with tall 15" snow tires! Then came the "easy" swap to the t-10....2 weeks of no homework later we had the coolest car again, Of coarse we had the t-10 apart several times after that!

 

The 3 posted images are of a SAGINAW 4 speed.The real giveaway is the shift arms are all on the side cover.On Muncies and T-10's the reverse lever is on the extension housing.And T-10's have a side cover that's curved on the bottom.Correct me if I'M wrong. BUTCH.

 

you're not wrong....it's a saginaw

The T-10 is different, as Butch says.

 

Definately a saginaw.

All ST10 cases have either 903 or 904 as the last digits int he casting number. It stands for the material it was cast out of. 903 is aluminum and 904 is cast iron. Also, all T10's have the reverse lever in the tailshaft, while all sag's have all three levers in the side cover. T10's also have the bottom of the side cover showing a definate curve,

 

Silly Sag.

 

Can anyone comment on specifics on this trans.....ratios, car or truck, good or bad trans to run behind a built SBC....small cube

thanks again guys and gals

Phil

 

Pretty good transmission as long as you don't get stupid with the torque input. Most were considered wide-ratio, with a first gear in the 2.70s (or so) on V8 cars. Some were made for Vegas with a 3.11 first gear, which can give good dig at the start without too much rear gear.

 

has two grooves on the input shaft.



search the hamb for

saginaw grooves ratio

and see what that means. You'll have to do some reading, but it will be worth the effort.

 

To my knowledge, there were four ratio spreads, with low gear ratios of 2.54, 2.85, 3.11, and 3.50:1. The number of grooves around the input shaft identifies the different ratios, or you can just mark the input and output, put it in low, and count the revolutions. One good point about them is that they're still affordable enough to buy one to use and one for a spare and still not spend anywhere near what you will for a Muncie.

 

Works fine behind a 275-300hp 327, and is surviving behind my 454 so far. Of course the fact that I get no traction whatsoever could be why the 8.2 ten bolt and Sag have lived this long.

I have burnt through a few Hayes Clutches though.

 

You can forget about power shifting one, unless you are rich and can afford to replace it often.

 

2 rings on the input shaft indicates a 3.11 1st gear ratio. Not too bad with a higher rear end ratio, around a 3.0 rear gear or higher.


jerry

 

As usual on the hamb, a little patience pays off with a wealth of information. Thanks to all who have contributed so far.

Phil Kiteley