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ol' 55 #1399031 Fri Feb 26 2021 08:29 PM
Joined: Nov 2002
Posts: 394
O
ol' 55 Offline OP
'Bolter
Thanks for all the help there Bolters...….

ol' 55 #1399061 Sat Feb 27 2021 12:45 AM
Joined: Jan 2013
Posts: 1,685
S
'Bolter
Never had much luck with saginaw 4speeds. One good speed shift from first to second would usually break it


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
ol' 55 #1399125 Sat Feb 27 2021 04:18 PM
Joined: Jun 2011
Posts: 4,650
E
'Bolter
They were not designed to be speed shifted from the start!

Ed


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
'55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
EdPruss #1399129 Sat Feb 27 2021 04:31 PM
Joined: Jan 2013
Posts: 1,685
S
'Bolter
Originally Posted by EdPruss
They were not designed to be speed shifted from the start!

Ed
Respectfully disagree Dragsix, about the only bad info I have seen you give. I have rebuilt many of these aluminum models and cant say anything redeeming about them, sorry. They have the lasting ability of a 16 year old boy on his first date.

Had one of these pos in my factory cosworth vega and it couldnt even take the torque of a 140 cu inch (115hp)four cylinder motor. Complete junk transmissions that one should think twice about before putting in their stove-bolt truck.

Last edited by sstock; Sat Feb 27 2021 04:43 PM.

1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
https://www.youtube.com/watch?v=Bli...n05i04t1aokgm4p04jiwgffwhyyih5xbk0h00410
1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration
ol' 55 #1399246 Sun Feb 28 2021 04:14 AM
Joined: Dec 2017
Posts: 1,183
D
'Bolter
I understand, I do, but I ran that cast iron Saginaw down the drag strip I cant tell you how many times between 2015 and 2017 behind a 261 without a single hic up. It was what I could afford at the time and it turned out to be very reliable. You just had to be easy with it. Like I said, no burn outs, slicks, big tires, dry hops, speed shifting, and other abuse. I replaced my sag in 2018 with a Muncie but my son is going to use the sag in a 57 car he is rebuilding. For an inexpensive traditional four speed it really can’t be beat $ wise. If you want to engage in abuse, it is not going to be the trans for you. But for everything else, it’s a pretty good choice if you are trying to be careful with the bread. Frankly, it was installed behind hundreds of thousands of vehicles over the years and provided dependable service, as long as it was not abused.

Last edited by Dragsix; Sun Feb 28 2021 04:33 AM.

Mike
sstock #1399281 Sun Feb 28 2021 01:52 PM
Joined: Jul 2019
Posts: 555
B
'Bolter
People break t56 transmissions at less than 300hp everyday. Its pretty easy to yank it into gear and “break” it. Yet in stock form they will hold over 800ft lbs all day long. Usually its a clutch or driver issue. My saginaw 4 speed was speed shifted behind a beastly powerplant and never broke during a shift but rather when the power came on rolling into it with tons of torque in a turbo setup. If your clutch releases clean and your shifter is set up right it should have no issues. I wish my T56 shifted as good as my old sag 4 speed. I have a video on my phone of how i treated my 4 speed but i cant really post a vid on here. Mabey i will put it on YouTube and link it.

ol' 55 #1399283 Sun Feb 28 2021 02:06 PM
Joined: Jul 2019
Posts: 555
B
'Bolter
Here ya go. Drove it like this everyday for at least 2 years and drove it to and from drift events and ran it on the tracks all day long with no issues.
Saginaw 4 speed beat down [youtu.be]

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