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Saginaw 3 Speed Manual W/OD
Is anyone running a Saginaw 3 speed manual with overdrive? Let me know what you think about it. Also what motor and rear-end gears you have.
A guy has the whole setup including wiring harness out of a 1967. I was thinking about replacing my SM420 4 speed with the OD unit. I have 3:73 rear gears with a 283. I don't have a tach but I would only drive about 60 mph or the engine would scream. |
Re: Saginaw 3 Speed Manual W/OD
I have 70 short step. 400 small block 3 spd over drive. 3:73 rear. Cruises at 26-2800 rpm. Going to change rear gears I think soon to 342. Trucks been on roads for 20+ yrs. but going to be doing more distance driving so lowering gears. Otherwise it is ok local but not that great with od an 3:73. Depends on what your plans are . Gas was around 1.50 I guess when it was a daily driver. Eats to much gas now at 3.+ in a gallon of fuel
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Re: Saginaw 3 Speed Manual W/OD
My experience with these Saginaw O/Ds is with putting one in a friend's little '54 pickup. Truck has stock running gear. He didn't like the freewheel nature of the overdrive when he let off. She seemed to speed up. We pulled that,put a full-synchro '72 truck 3spd in along with the 3.08 rear from the same truck and that '54 gets on down the road just fine now.
I dig those 3spd/overdrive set-ups,though. I had a '61 Studebaker SWB with one behind the 259 V8. I remember really liking that set-up. |
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Does anyone know what gearing the OD is?
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So here is my current setup 283 V8 3.73 rearend gears 28" tall tires SM420 ..................4th gear 1.00 at 70 MPH gives you 3133 RPM (current setup) Saginaw 3 speed W/OD gear 0.70 at 70 MPH gives you 2193 RPM That gives you 30% OD Now I need to find info to confirm the OD gearing. |
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1st: 3.09 2nd: 1.67 3rd: 1.0 4th/OD: 0.73 Fairly certain the ratios are the same as a 700R4. |
Re: Saginaw 3 Speed Manual W/OD
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I'm sure I have posted this before but here goes again.
Might want to read through a thread we ran not too long ago. http://67-72chevytrucks.com/vboard/s...d.php?t=624630 |
Re: Saginaw 3 Speed Manual W/OD
Thanks for the help guys. I'll let you know if I end up buying they tranny.
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I had seriously contemplated running a 3 speed w/ OD, but decided to run a T5. Still putting the truck together, but it made sense to me- the trucks getting other mods as well.
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I have been looking for one for a while. Apparently you can put the overdrive unit on a Saginaw 4 speed. That's what I have in my 2wd Blazer. So if you don't get it I may want it...Just sayin.
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Good luck on it. I wondered why this o/d wouldn't work on a Sag 4spd. I have one. If they were easier to get your hands on I'd consider going that route
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Re: Saginaw 3 Speed Manual W/OD
Supposedly they do work on Saginaw four speeds. You have to do a mod or two but they are not that hard.
http://www.chevytrucks.org/tech/overdrive.htm |
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Well the 3 speed OD transmission I wanted to buy has sold so..... I guess you snooze you loose :sumo:
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Yeah,I wish I could just buy,then figure out if I can use it of if it will suite my needs. Actually,that used to be my method. I never bought a part I regretted,whether I used it or not.
Thanks x2 on both links. You don't want that 4spd set-up? I'd love to go for it but my accountant says I can't play. I'm stubborn and I love old school stuff,but starting to consider a T-5 and just sell my 4spds. Ideally,the plan is to use the M22 with the 3.42 rear for now then,when I could afford it,fit a Gear Vendors up. My thinking is 3.42s are as tall as I'll go and with o/d not be too tall. If I didn't like it I'd have a bolt-in 3.42 67-72 12-bolt to sell and swap-in a 3.73 or 4.10 rear. But dang! I'm not rich and between that M22 and Gear Vendors I'd have thousands of dollars worth of stuff to do what a Junkyard T-5 can do. That money would go a long way towards doing the truck |
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